JP5499251B2 - Image processing apparatus and image processing program - Google Patents

Description

  In order to measure a time change of a predetermined measurement point on the surface of the rotator, the present invention processes chronologically captured images output by an imaging device that images the surface of the rotator with a time interval. The present invention relates to an image processing apparatus and an image processing program.

  Thermography that detects (photographs) the amount of infrared energy radiated from a subject with an infrared detector that is arranged in two dimensions and examines the temperature distribution of the subject by image processing is widely used in test equipment and monitoring equipment. ing. In recent years, the time required to shoot one image has been shortened to about 1/5000 seconds by improving the sensitivity and response speed of the infrared detection element. For this reason, even a moving subject can be captured at a high shutter speed to obtain a still subject image at a certain moment, and the temperature distribution state can be examined.

  On the other hand, in an industrial application field, not only a temperature distribution at a certain moment but also a time change of temperature is often important. For example, in a wheel disc brake device, the sliding surface becomes locally hot due to frictional heat during braking, and then gradually cooled by cooling air accompanying rotation, so it is possible to grasp the temperature rise and the time change of cooling. Required by design.

  When investigating temporal changes in the temperature of a stationary object, thermal image acquisition using thermography is repeated discretely, and the images are transferred sequentially from the thermography to the analysis personal computer (PC), so that the temporal change in temperature distribution can be observed. Be examined. The time interval between images depends on the transfer speed between the thermography and the analysis PC, but since a certain time is required for the temperature change, the image transfer speed does not need to be so high. For example, the wheel disc brake device has a large heat capacity, the temperature change is about 20 ° C./second, and the temperature change when transferring images at a general 1/30 second interval is 1 ° C. or less.

  On the other hand, when the subject rotates at an unspecified number of rotations, the thermal image obtained discretely does not have a constant angle (position) of the rotating body depending on the shooting timing. It is not possible to follow the time change directly. In addition, shortening the thermal image time interval for the purpose of continuously capturing subjects that rotate at high speed is generally difficult due to the large amount of data to be transferred unless there are restrictions such as reducing the image size. It becomes. Furthermore, when photographing an actual rotating body, there are many cases where a concealed portion that cannot be photographed is generated on a part of the subject by another stationary device. In this case, due to the rotation of the subject, there are a moment when the element (measurement point) of interest is hidden and a moment when it is not hidden. For example, a composition correction apparatus that corrects the composition of a subject in a plurality of captured images has been proposed.

  A conventional composition correction device stores an image sensor that captures an image of an object, an attitude sensor that detects the attitude of a camera at the time of shooting, and attitude data output by the attitude sensor in addition to captured image data output by the image sensor. An external memory and a control unit for rotating the photographed image based on the posture data added to the photographed image data are provided (for example, see Patent Document 1). In such a conventional composition correction device, when the control unit determines that the camera is tilted at the time of shooting based on the posture data output from the posture sensor, the posture in which the subject stands upright according to the tilt angle of the camera This control unit rotates the captured image until.

JP 2007-258989

  In such a conventional composition correction device, when the subject rotates around the rotation center, the rotation angle of the subject cannot be detected, and the posture of the subject in the captured images obtained discretely becomes constant. As described above, there is a problem that these captured images cannot be corrected. In particular, when the subject is a brake disc whose temperature does not change concentrically and changes in a spot shape, the image is taken with one point on the brake disc moved to various positions. Therefore, there is a problem that it is impossible to determine which part of the brake disk is heated or cooled. Further, in such a conventional composition correction device, when there is a shielding object that blocks the subject, it is impossible to detect whether or not the measurement point of the subject is hidden by the shielding object. There is a problem that time changes cannot be observed accurately.

  An object of the present invention is to provide an image processing apparatus and an image processing program capable of easily correcting these photographed images so that predetermined measurement points in the photographed images in time series order are always at the same position. is there.

The present invention solves the above-mentioned problems by the solving means described below.
In addition, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this embodiment.
As shown in FIGS. 3 and 4, the invention of claim 1 is provided with a time interval in order to measure a time change of a predetermined measurement point (P) on the surface (6a) of the rotating body (6). An image processing apparatus for processing time-sequentially taken images (D ₀ ,...) Output by the imaging device (7) that images the surface of the rotating body, and detecting the amount of rotation for detecting the amount of rotation of the rotating body. Based on a rotation amount detection signal output from the device (8), a rotation angle calculation unit (12) for calculating a rotation angle (θ) of the rotating body, and the predetermined measurement point in the time-series photographed image Is an image processing device (9) including an image correction unit (15) that corrects the chronologically captured images based on the rotation angle of the rotator so that they are at the same position.

  According to a second aspect of the present invention, in the image processing apparatus according to the first aspect, as shown in FIG. 4, the image correction unit performs the predetermined measurement when the rotation center (O) of the rotating body is the origin. The image processing apparatus is characterized in that the captured images in the time-series order are corrected based on the rotation angle of the rotating body so that the coordinates of the points are the same.

  According to a third aspect of the present invention, in the image processing apparatus according to the first or second aspect, as shown in FIG. 3, an image information recording unit (20a) for recording the time-series captured images as image information; A rotation angle information recording unit (20b) for recording, as rotation angle information, the rotation angle of the rotating body when the captured images in the time series are captured, corresponding to the captured images in the time series. An image processing apparatus characterized by the above.

According to a fourth aspect of the present invention, in the image processing apparatus according to the third aspect, as shown in FIG. 5, the rotation angle information recording unit includes a photographing start time (t ₀ , t ₁ ,...) Of the photographed image. When there is a delay time (Δt) between the recorded image recording completion times (t ₀₂ , t ₁₂ ,...), The rotation angle of the rotating body before the delay time is used as the rotation angle information. An image processing apparatus that records in correspondence with the chronologically taken images.

  According to a fifth aspect of the present invention, in the image processing apparatus according to any one of the first to fourth aspects, as shown in FIG. 4, the image correction unit is equal to the rotation angle of the rotating body. An image processing apparatus characterized in that, in a direction opposite to the rotation direction of the rotating body, the captured images in the time series order are rotated with the rotation center of the rotating body as an origin, and the captured images in the time series order are corrected. It is.

  According to a sixth aspect of the present invention, in the image processing device according to any one of the first to fifth aspects, the image correction unit is configured to detect the thermal image when the photographing device is a thermal image photographing device. The image processing apparatus is characterized in that the time-series thermal image is corrected so that the predetermined measurement points in the time-series thermal image output from the photographing apparatus are at the same position.

  According to a seventh aspect of the present invention, in the image processing device according to any one of the first to sixth aspects, as shown in FIGS. 3 and 4, the time-series order corrected by the image correction unit is provided. An image processing apparatus comprising: a state change measuring unit (19) that measures a state change of the predetermined measurement point in the time-sequential captured image based on the captured image.

According to an eighth aspect of the present invention, in the image processing apparatus according to the seventh aspect, as shown in FIGS. 1, 2, and 4, the state change measuring unit shields the surface of the rotator. 5) and the predetermined measurement point overlap with each other when there is a defective captured image (D ₂ ) in the time-sequential captured image, the state change of the predetermined measurement point in the defective captured image An image processing apparatus is characterized in that the change in the state of the predetermined measurement point is measured by excluding the measurement result.

  According to a ninth aspect of the present invention, in the image processing device according to the seventh or eighth aspect, the state change measurement unit outputs the thermal image photographing device when the photographing device is a thermal image photographing device. An image processing apparatus for measuring a temperature change at the predetermined measurement point in the time-series sequential thermal image.

  According to a tenth aspect of the present invention, in the image processing apparatus according to the ninth aspect, the state change measuring unit is configured to perform the state change on the surface of the brake disc when the surface of the rotating body is a brake disc of a disc brake device. An image processing apparatus that measures a temperature change at a predetermined measurement point.

  According to an eleventh aspect of the present invention, in the image processing device according to the ninth or tenth aspect, as shown in FIG. 6, the state change measuring unit is configured to detect the state change when the photographing device is a thermal image photographing device. The temperature in a plurality of pixel regions including the predetermined measurement point in the time-series sequential thermal image output from the thermal image capturing apparatus and the periphery of the measurement point is averaged, and the state change of the predetermined measurement point is measured. An image processing apparatus characterized in that:

In the invention of claim 12, as shown in FIGS. 3, 4, and 8, the time interval is measured in order to measure the time change of the predetermined measurement point (P) on the surface (6a) of the rotating body (6). Is an image processing program for processing chronologically captured images (D ₀ ,...) Output by the imaging device (7) that images the surface of the rotator, and detects the amount of rotation of the rotator. Based on a rotation amount detection signal output from the rotation amount detection device (8), a rotation angle calculation procedure (S510) for calculating the rotation angle (θ) of the rotating body, and the predetermined in the time-series captured images. The image processing program includes an image correction procedure (S530) for correcting the photographic images in the time series order based on the rotation angle of the rotator so that the measurement points are in the same position.

  According to a thirteenth aspect of the present invention, in the image processing program according to the twelfth aspect, as shown in FIG. 4, the image correction procedure includes the predetermined measurement when the rotation center (O) of the rotating body is an origin. An image processing program comprising a procedure for correcting the photographic images in the chronological order based on the rotation angle of the rotating body so that the coordinates of the points are the same.

  According to a fourteenth aspect of the present invention, in the image processing program according to the twelfth or thirteenth aspect, an image information recording procedure (S510, S530) for recording the captured images in the time series order as image information, and the time series order. And a rotation angle information recording procedure (S520) for recording the rotation angle of the rotating body when the captured image is taken as rotation angle information in association with the time-series captured images. It is a processing program.

According to a fifteenth aspect of the present invention, in the image processing program according to the fourteenth aspect, as shown in FIG. 5, the rotation angle information recording procedure includes a photographing start time (t ₀ , t ₁ ,...) Of the photographed image. When there is a delay time (Δt) between the recorded image recording completion times (t ₀₂ , t ₁₂ ,...), The rotation angle of the rotating body before the delay time is used as the rotation angle information. An image processing program comprising a procedure for recording in correspondence with the chronologically taken images.

  According to a sixteenth aspect of the present invention, in the image processing program according to any one of the twelfth to fifteenth aspects, as shown in FIG. 4, the image correction procedure is performed by the rotation angle of the rotating body. The method includes a step of rotating the captured image in the time series order with the rotation center of the rotating body as an origin in a direction opposite to the rotational direction of the rotating body, and correcting the captured image in the time series order. An image processing program.

  According to a seventeenth aspect of the present invention, in the image processing program according to any one of the twelfth to sixteenth aspects, the image correction procedure is performed when the photographing apparatus is a thermal image photographing apparatus. An image processing program including a procedure for correcting a thermal image in a time series order so that the predetermined measurement points in the thermal image in a time series order output from the photographing apparatus are at the same position.

  According to an eighteenth aspect of the present invention, in the image processing program according to any one of the twelfth to seventeenth aspects, as shown in FIG. 4 and FIG. An image processing program comprising a state change measurement procedure (S540) for measuring a state change of the predetermined measurement point in a time-sequential captured image based on a captured image.

According to a nineteenth aspect of the present invention, in the image processing program according to the eighteenth aspect, as shown in FIGS. 1, 2, 4, and 8, the state change measurement procedure includes shielding that shields the surface of the rotating body. When a defective captured image (D ₂ ) in which the body (4, 5) and the predetermined measurement point overlap exists in the time-sequential captured image, the predetermined measurement point in the defective captured image is displayed. An image processing program including a procedure for measuring a change in state at a predetermined measurement point by excluding a measurement result of state change.

  According to a twentieth aspect of the present invention, in the image processing device according to the eighteenth or nineteenth aspect, the thermal image capturing device outputs the state change measurement procedure when the photographing device is a thermal image capturing device. An image processing program comprising a procedure for measuring a temperature change at the predetermined measurement point in the time-series sequential thermal image.

  According to a twenty-first aspect of the present invention, in the image processing program according to the twentieth aspect, the state change measurement procedure is performed when the surface of the rotating body is a brake disc of a disc brake device. An image processing program including a procedure for measuring a temperature change at a predetermined measurement point.

  According to a twenty-second aspect of the present invention, in the image processing program according to the twentieth or twenty-first aspect, as shown in FIG. 6, the state change measurement procedure is performed when the photographing apparatus is a thermal image photographing apparatus. The temperature in a plurality of pixel regions including the predetermined measurement point in the time-series sequential thermal image output from the thermal image capturing apparatus and the periphery of the measurement point is averaged, and the state change of the predetermined measurement point is measured. This is an image processing program characterized by including a procedure to perform.

  According to the present invention, these captured images can be easily corrected so that the predetermined measurement points in the captured images in time series are always at the same position.

1 is a front view schematically showing a disc brake test apparatus in which an image processing apparatus according to an embodiment of the present invention is used. 1 is a side view schematically showing a disc brake test apparatus in which an image processing apparatus according to an embodiment of the present invention is used. 1 is a configuration diagram of an image processing apparatus according to an embodiment of the present invention. It is a timing chart for demonstrating the correction process of the image correction part of the image processing apparatus which concerns on embodiment of this invention, and the measurement process of a state change measurement part. It is a timing chart for demonstrating the correction process of the rotation angle correction | amendment part of the image processing apparatus which concerns on embodiment of this invention. It is a conceptual diagram for demonstrating the averaging process of the state change measurement part of the image processing apparatus which concerns on embodiment of this invention. It is a flowchart explaining operation | movement of the image processing apparatus which concerns on embodiment of this invention. 3 is a flowchart for explaining an image processing operation of the image processing apparatus according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The disc brake test apparatus 1 shown in FIGS. 1 and 2 is an apparatus that performs various tests on the disc brake apparatus 3. The disc brake test device 1 is used, for example, when testing the brake performance and thermal characteristics of the actual disc brake device 3. The disc brake test device 1 generates a braking force (braking force) on the brake disc 6 by pressing the friction material 4 in a stationary state against a friction surface 6b that rotates integrally with the brake disc 6, and this brake disc 6 The rotational speed of the disk 6 is reduced. For example, the disc brake test apparatus 1 is configured to apply a friction material to the friction surface 6b in a state where the brake disc 6 is rotated 30 to 40 times per second in order to simulate a braking state of a railway vehicle traveling at a speed of 400 km / h. 4 is pressed. The disc brake test apparatus 1 includes a direct current motor that generates a driving force, a flywheel that is rotationally driven by the direct current motor, and a gear device that transmits the rotation of the flywheel to the rotating shaft 2a of the actual wheel 2. .

  The wheel (rotating body) 2 is a member that is in rotational contact with the rail, and includes a rotating shaft 2a shown in FIG. 1, a tread surface 2b shown in FIG. 2, a flange portion 2c, and the like. The wheel 2 shown in FIG.1 and FIG.2 is a wheel with a disk which attached the brake disk 6 to the both sides | surfaces. A rotating shaft 2 a shown in FIG. 1 is a portion that rotates integrally with the wheel 2, and is press-fitted into a through hole formed in the center of the wheel 2. The rotation shaft 2 a becomes the rotation center O of the wheel 2 and the brake disc 6. The tread surface 2 b shown in FIG. 2 is a portion that contacts the rail top surface and receives frictional resistance, and is formed on the outer peripheral portion of the wheel 2. The flange portion 2 c is a portion that prevents wheel removal, and is formed continuously on the outer periphery of the wheel 2.

  The disc brake device 3 shown in FIGS. 1 and 2 is a device that brakes by the frictional force generated on the friction surface 6 b of the brake disc 6. The disc brake device 3 transmits a driving force generated by a hydraulic or pneumatic cylinder to the friction material 4 by a brake lever mechanism, and presses the friction material 4 against the friction surface 6b to generate a braking force. The disc brake device 3 includes a friction material 4 shown in FIGS. 1 and 2, a support 5 shown in FIG. 1, a brake disc 6 shown in FIGS.

  A friction material (shielding body) 4 shown in FIGS. 1 and 2 is a member that generates a frictional force in contact with the friction surface 6 b of the brake disk 6. The friction material 4 is pressed against the friction surface 6b of the brake disc 6 to generate a braking force. As shown in FIG. 2, the friction material 4 is disposed in a pair so as to sandwich the brake disk 6, and is driven in the direction of the arrow in the figure by the driving force generated by the brake mechanism section to come into contact with the friction surface 6b. And separate. The friction material 4 is, for example, a sintered alloy control wheel that has high heat resistance and has a moderately increased adhesion effect under wet conditions. A brake lining is mounted on the surface of the brake disk 6 that contacts the friction surface 6b. Yes. The friction material 4 exists between the brake disc 6 and the photographing device 7, and serves as a shield that shields a part of the surface 6 a of the brake disc 6 when photographing the brake disc 6 by the photographing device 7.

  A support (shield) 5 shown in FIGS. 1 and 2 is a member that supports a signal line. The support 5 is, for example, a support that supports a measurement signal line that is electrically connected to a slip ring that transmits and receives signals between the rotating body and the fixed body. As shown in FIG. 2, the support 5 exists between the brake disk 6 and the photographing device 7, and when the brake disk 6 is photographed by the photographing device 7, the surface of the brake disk 6 is the same as the friction material 4. It becomes the shielding body which shields a part of 6a.

  A brake disc (rotating body) 6 shown in FIGS. 1 and 2 is a member to which the friction material 4 is pressed during braking (braking), and is a disc-shaped friction material that rotates integrally with the axle 2. . The brake disc 6 shown in FIGS. 1 and 2 is a wheel-side disc attached to both side surfaces of the wheel 2. The brake disk 6 has a divided structure in which a plurality of brake disks 6 form a ring in the case of a conventional line, and a single structure in which a single ring forms a ring in the case of a high-speed Shinkansen. The material of the brake disk 6 is, for example, pearlite cast iron because of its thermal conductivity and wear resistance. A heat-resistant low alloy cast iron material is used for the Shinkansen, and an integrated low alloy forged steel material is used for the high-speed Shinkansen. The The brake disc 6 has an outer diameter of about 710 mm and a plate thickness of about 20 mm, for example, in the case of a Shinkansen wheel side disc having a wheel diameter of 910 mm. The brake disk 6 includes a cooling fin portion (heat radiating portion) that generates cooling air during rotation and dissipates heat generated during braking, and this fin portion is on the side opposite to the side in contact with the friction material 4. A plurality of radial shapes are formed on the back surface of the brake disk 6. As shown in FIGS. 1 and 2, the brake disc 6 includes a surface 6a, a friction surface 6b, a fixing member 6c, and the like. The surface 6a is a subject photographed by the photographing device 7, and is constituted by a friction surface 6b on the side facing the photographing device 7, a fixing member 6c, and the like. The friction surface 6 b is a sliding surface (brake surface) that contacts the friction material 4. The friction surface 6 b becomes a high temperature of about 600 to 1000 ° C., for example, due to frictional heat generated by contact with the friction material 4. The fixing member 6c is a member that fixes the brake disc 6 to the wheel 2, and is arranged at a predetermined interval in the circumferential direction of the wheel 2 and the brake disc 6 as shown in FIG. The fixing member 6 c includes a fastening bolt that is inserted into the through hole of the wheel 2 and the brake disk 6, a fastening nut that meshes with the fastening bolt, and the like, and rotates together with the brake disk 6.

A photographing device 7 shown in FIGS. 1 and 2 is a device that photographs the surface 6a of the brake disc 6 with a time interval. The photographing device 7 includes a friction surface 6b of a brake disc 6 that rotates about a rotation axis 2a of a wheel 2 as a rotation center O, a top surface and a bolt tip surface of a fastening bolt of a fixing member 6c, and a head of a fastening nut of a fixing member 6c. Shoot the top surface. The photographing device 7 is, for example, a thermal image photographing device (infrared thermal imaging device (thermography)) for photographing a thermal image, photographing a low temperature portion in blue and photographing a high temperature portion in red. For example, the photographing device 7 can transmit a thermal image of about 30 frames per second to the image processing device 9 so that the central axis of the rotating shaft 2a and the optical axis of the photographing device 7 are substantially coincident or substantially parallel. The shooting direction is set to. The photographing device 7 reduces the noise of a photographing optical system that forms a subject image on an infrared imaging element, an infrared imaging element that converts infrared light into an electrical signal, and a thermal image captured by the infrared imaging element. A cooling unit that cools the infrared imaging device, and a filter unit that adjusts the amount of infrared light incident on the infrared imaging device from a subject image. The imaging device 7 detects the amount of infrared energy radiated from the surface 6a of the brake disk 6 serving as a heat source by an infrared imaging device, performs image processing, analyzes the intensity of the infrared rays, and measures the temperature distribution state of the surface 6a. . Since the surface 6a of the brake disc 6 that is the subject rises to a maximum of about 1000 ° C., the photographing device 7 filters the amount of infrared light incident on the infrared imaging element so that a thermal image can be taken within a wide temperature range. The temperature range that can be taken is expanded. On the other hand, since the resolution of the infrared imaging element is lowered by the filter unit in the photographing device 7, the resolution of the infrared imaging element is set according to the temperature range so that the resolution of the infrared imaging element is higher in the high temperature range and lower in the low temperature range. It can be manually switched by the examiner. The photographing device 7 takes a thermal image of the surface 6a of the brake disk 6 at an arbitrary photographing timing with a time interval, and takes a chronological order of captured images D ₀ , which are discrete thermal images as shown in FIG. Are output to the image processing apparatus 9 as image information (captured image signal).

  The rotation amount detection device 8 shown in FIGS. 1 and 2 is a device that detects the rotation amount of the brake disk 6. The rotation amount detection device 8 detects the rotation speed of the brake disk 6 that rotates about the rotation shaft 2a of the wheel 2 as the rotation center O. The rotation amount detection device 8 is, for example, a rotary encoder that is attached to the rotation shaft 2a of the wheel 2 and generates a pulse signal according to the rotation displacement amount of the wheel 2 and the brake disk 6. The rotation amount detection device 8 outputs rotation amount information (rotation amount detection signal) corresponding to the rotation of the brake disk 6 to the image processing device 9.

The image processing device 9 shown in FIG. 1 to FIG. 3 displays the time-sequential captured images D ₀ ,... Output from the imaging device 7 in order to measure the time change of the measurement point P on the surface 6a of the brake disk 6. It is a device for processing. As shown in FIG. 4, the image processing device 9 shoots images in chronological order output by the imaging device 7 based on the image information output by the imaging device 7 and the rotation amount information output by the rotation amount detection device 8. image D _0, as ... measuring point P of the medium is at the same position, the captured image D ₀ of the chronological order, ... corrected. The image processing device 9 is constituted by a personal computer, for example, and executes predetermined processing according to an image processing program. As shown in FIG. 3, the image processing device 9 includes an image information input unit 10, a rotation amount information input unit 11, a rotation angle calculation unit 12, a rotation angle correction unit 13, a delay time information storage unit 14, Image correction unit 15, measurement point position information storage unit 16, shield position information storage unit 17, photographed image determination unit 18, state change measurement unit 19, information recording unit 20, processing condition setting unit 21 , An information display unit 22, a program storage unit 23, a control unit 24, and the like.

  The image information input unit 10 shown in FIG. 3 is a means for inputting image information output from the photographing apparatus 7. The image information input unit 10 receives image information in time series order output from the photographing apparatus 7, and the image information input unit 10 outputs the image information in time series order to the control unit 24. The image information input unit 10 is, for example, an image input board including an interface (I / F) circuit for inputting image information from the photographing device 7 to the image processing device 9.

  The rotation amount information input unit 11 is means for inputting rotation amount information output from the rotation amount detection device 8. The rotation amount information input unit 11 receives the rotation amount information of the pulse train output from the rotation amount detection device 8, and the rotation amount information input unit 11 outputs the rotation amount information of the pulse train to the control unit 24. The rotation amount information input unit 11 is, for example, a rotation amount input board including an interface (I / F) circuit that inputs rotation amount information from the rotation amount detection device 8 to the image processing device 9.

The rotation angle calculation unit 12 is a means for calculating the rotation angle θ of the brake disk 6 based on the rotation amount detection signal output from the rotation amount detection device 8. The rotation angle calculation unit 12 calculates the rotation angle θ of the brake disk 6 by integrating the rotation amount detection signals of the pulse train output from the rotation amount information input unit 11. Here, as shown in FIG. 4, when the rotation center O of the brake disk 6 is set as the origin of the coordinate system, the rotation angle θ is determined from a predetermined reference position P ₀ on the surface 6a of the brake disk 6 and the origin. Is an angle formed by a straight line passing through the Y axis of this coordinate system. The rotation angle calculation unit 12 is, for example, a pulse counter board that integrates the number of pulses input from the rotation amount information input unit 11. For example, when the predetermined reference position P ₀ on the surface 6a of the brake disk 6 is located on the Y axis of the coordinate system, the rotation angle calculation unit 12 sets the rotation angle θ of the brake disk 6 to 0 ° or 360 °. Then, the rotation angle θ of the brake disk 6 is calculated. The rotation angle calculation unit 12 outputs the calculated rotation angle θ to the control unit 24 as rotation angle information (rotation angle signal).

The rotation angle correction unit 13 illustrated in FIG. 3 is a unit that corrects the rotation angle θ calculated by the rotation angle calculation unit 12. Rotation angle correction unit 13, as shown in FIG. 5, the captured image D _0, D ₁ shown in FIG. 4, ... shooting start time t _0, t ₁ of, ... shooting Toko image D _0, D _1, ... of When there is a delay time Δt between the recording completion times t ₀₂ , t ₁₂ ,..., The rotation angle θ of the brake disk 6 before the delay time Δt is corrected as rotation angle information. Here, the delay time Δt shown in FIG. 5 depends on the transfer rate between the imaging device 7 and the image processing device 9 and is constant regardless of the rotational speed of the brake disk 6. For example, as shown in FIG. 5, the rotation angle correction unit 13 starts shooting (shooting start times t ₀ , t ₁ ,...) From the shooting device 7, and sends a shot image from the shooting device 7 to the image processing device 9. Transfer (transfer start time t ₀₁ to recording completion time t ₀₂ , transfer start time t ₁₁ to recording completion time t ₁₂ ,...), And a captured image recording completion flag is generated in this image processing device 9 (recording completion time t ₀₂ , t _12, ...) difference in time (recording completion time t ₀₂ - shot start time t _0, the recording completion time t ₁₂ - to correct the rotation angle θ as the imaging start time t _1, ...) the delay time Delta] t. Rotation angle correction unit 13, the rotational angle Δθ of rotation amount detector 8 rotation angle calculating section 12 is a pulse sequence output is calculated by integrating during this delay time Delta] t, the rotation angle calculation unit 12 is time t ₀₂ , T ₁₂ ,... Are subtracted from the rotation angle θ calculated at time t ₀ , t ₁ ,... Before the delay time Δt to correct the rotation angle θ of the brake disc 6 as the rotation angle θ. The rotation angle correction unit 13 outputs the corrected rotation angle θ to the control unit 24 as rotation angle information (rotation angle signal).

  The delay time information storage unit 14 shown in FIG. 3 is means for storing the delay time Δt. The delay time information storage unit 14 is a memory that stores the delay time Δt shown in FIG. 5 as delay time information. The delay time information storage unit 14 measures the delay time Δt in advance based on, for example, a stationary verification test combining the imaging device 7 and the image processing device 9 that are actually used devices, and stores this delay time Δt. doing.

The image correction unit 15 shown in FIG. 3 takes the chronologically captured images based on the rotation angle θ of the brake disk 6 so that the measurement points P in the chronologically captured images D ₀ ,. It is means for correcting D ₀ ,. As shown in FIG. 4, the image correction unit 15 adjusts the time based on the rotation angle θ of the brake disk 6 so that the coordinates of the measurement point P are the same when the rotation center O of the brake disk 6 is the origin. The captured images D ₀ ,... In the sequence order are corrected. The image correction unit 15 uses the rotation center O of the brake disk 6 as the origin in the direction opposite to the rotation direction of the brake disk 6 by the rotation angle θ of the brake disk 6, and takes the photographic images D ₀ ,. Rotate to correct the photographic images D ₀ ,. The image correction unit 15 reversely rotates the captured images (thermal images) D ₁ and D ₂ obtained discretely around the central axis of the brake disk 6 based on the simultaneously recorded rotation angle (rotation amount) θ. Thus, the corrected captured images (thermal images) D ₁ ′ and D ₂ ′ that have been rotationally corrected are generated. The image correction unit 15 sets, for example, the coordinates (x ′, y ′) = (rsinθ ₀ , rcosθ ₀ ) of the measurement point P when the rotation angle is 0 °, and the coordinates of the measurement point P when the rotation angle θ is ( x, y), the captured image D ₀ ,. Here, r shown in FIG. 4 is a moving radius when the measurement point P is expressed in polar coordinates, and θ ₀ is an angle (deflection angle) between the starting line (Y axis) and the moving radius.

The image correcting unit 15 outputs the corrected captured images D ₁ ′, D ₂ ′,..., Which are discrete thermal images, to the control unit 24 as corrected image information (captured image signal).

  The measurement point position information storage unit 16 shown in FIG. 3 is means for storing the position of the measurement point P. The measurement point position information storage unit 16 is a memory that stores the polar coordinates of the measurement point P as measurement point position information when the position of the measurement point P is defined by polar coordinates. The measurement point position information storage unit 16 is, for example, an arbitrary position on the friction surface 6b of the brake disk 6 shown in FIG. 1, the top surface or the top surface of the fastening bolt of the fixing member 6c, the top surface of the fastening nut, and the like. Is the measurement point P, the polar coordinates of these measurement points P are stored.

  The shield position information storage unit 17 shown in FIG. 3 is means for storing the position of the shield that shields between the surface 6 a of the brake disk 6 and the imaging device 7. The shield position information storage unit 17 is a memory that stores the polar coordinates of the shield as shield position information when the position of the shield is defined by polar coordinates. The shielding body position information storage unit 17 stores, for example, polar coordinates of a shielding area (hidden area) A where the surface 6a of the brake disk 6 is shielded by the friction material 4 and the support 5 shown in FIG.

The photographed image determination unit 18 shown in FIG. 3 includes a photographed image D ₂ ′ in which the shield that shields the surface 6 a of the brake disk 6 and the measurement point P overlap each other in the photographed images D ₀ ′,. It is means for determining whether or not. As shown in FIG. 4, the captured image determination unit 18 overlaps the measurement point P and the shielding area A based on the captured images D ₀ ′,... Corrected in time series by the image correction unit 15. Determines whether or not the photographed image D ₂ ′ concealed by the shielding area A exists in the photographed images D ₀ ′,. The captured image determination unit 18 determines that the captured images D ₀ , D ₁ , D ₃ are good when there are captured images D ₀ , D ₁ , D ₃ where the measurement point P and the shielding area A do not overlap, when captured image D ₂ of the measurement point P and the shielded area a overlaps exists determines the photographed image D ₂ as defective. For example, as shown in FIG. 6, when the number of pixels of the photographing apparatus 7 is 256 × 256 pixels, the photographed image determination unit 18 has a 3 × 3 aspect ratio including the measurement point P and the periphery of the measurement point P. When at least one pixel in the pixel area of the pixel overlaps the shielding area A shown in FIG. The captured image determination unit 18 outputs these determination results to the control unit 24 as determination information (captured image determination signal).

The state change measuring unit 19 shown in FIG. 3 is based on the time-sequential captured images D ₀ ′,... Corrected by the image correcting unit 15, and the measurement points P in the time-sequential captured images D ₀ ′,. It is a means for measuring the state change. As shown in FIG. 4, the state change measuring unit 19 is configured such that a defective captured image D ₂ ′ in which the shield that shields the surface 6 a of the brake disk 6 and the measurement point P overlap is a captured image D ₀ ′ in time series. ... Is present, the measurement result of the state change of the measurement point P in the defective photographed image D ₂ ′ is excluded, and the state change of the measurement point P is measured. The state change measurement unit 19 measures, for example, the temperature change at the measurement point P in the time-series thermal image output from the imaging device 7 and generates a graph representing the time change of the temperature T ₀ ,. To do. The state change measurement unit 19 shoots in chronological order except for the temperature T ₂ of the measurement point P at time t ₂ determined as a defective photographic image D ₂ ′ among the chronologically captured images D ₀ ′,. image D ₀ ', ... captured image D ₀ good _{among', D 1 ', D 3} ', ... and the determined time t _0, t _1, t ₃ the temperature T ₀ of the measurement point P in, T _1, generating a graph on the basis of T _3.

As shown in FIG. 6, the state change measurement unit 19 includes a plurality of pixel regions including a measurement point P in the chronologically captured images D ₀ ,... Output from the imaging device 7 and surroundings of the measurement points P. The temperature is averaged, and the change in temperature at the measurement point P is measured. The state change measuring unit 19 averages the temperatures in the pixel region composed of a plurality of pixels in the captured image D ₀ ′,... Based on the temperature distribution of the corrected thermal images in time series. For example, as shown in FIG. 6, when the number of pixels of the photographing apparatus 7 is 256 × 256 pixels, the state change measuring unit 19 has a 3 × 3 aspect ratio including the measurement point P and the periphery of the measurement point P. An average value of temperatures in the pixel area of the pixel is calculated as a representative value in the pixel area. The state change measurement unit 19 outputs the change in the temperature T ₀ ,... Of the measurement point P after averaging to the control unit 24 as measurement information (state change measurement signal) indicating the state change of the measurement point P after measurement. .

The information recording unit 20 illustrated in FIG. 3 is a unit that records various information regarding the image processing apparatus 9. The information recording unit 20, for example, captured image D ₀ shown in FIG. 4, ..., D ₀ ', ..., the rotation angle theta, the temperature T ₀ of the measurement point P, ... and the captured image D _0', etc. ... determination result For example, a memory that records the chronological order in a time series. The information recording unit 20 records, for example, the rotation angle θ of the brake disk 6 at the time of shooting this image at the same time as shooting and recording of one image by the shooting device 7, and each shot image D ₀ ,. ₀ ', ... captured image D ₀ rotation angle θ at the time of shooting, ..., D _0', is recorded ... each. As shown in FIG. 3, the information recording unit 20 includes an image information recording unit 20a, a rotation angle information recording unit 20b, a measurement information recording unit 20c, a determination information recording unit 20d, and the like.

The image information recording unit 20a is a part that records the captured images D ₀ ,..., D ₀ ′,... In time series order as image information, and the image information output by the imaging device 7 and the correction output by the image correction unit 15 The subsequent image information is recorded in chronological order at each time t ₀ ,. The rotation angle information recording unit 20b uses the rotation angle θ of the brake disk 6 when the captured images D ₀ ,..., D ₀ ′,. _0, ..., D ₀ ', a part of recorded corresponding ... and. When the delay time Δt shown in FIG. 5 exists, the rotation angle information recording unit 20b uses the rotation angle θ of the brake disk 6 that is earlier by the delay time Δt as rotation angle information, and the captured images D ₀ , .., D ₀ ',. The rotation angle information recording unit 20b shown in FIG. 3 records the rotation angle information calculated by the rotation angle calculation unit 12 and the rotation angle information corrected by the rotation angle correction unit 13 in chronological order at each time t ₀ ,. The measurement information recording unit 20c is a part for recording the measurement result of the state change of the measurement points P in time series order. The measurement information (temperature information) indicates the temperatures T ₀ ,... Of the measurement points P measured by the state change measurement unit 19. as), chronological order of the captured image D _0, ..., D ₀ ', ... at time t ₀ in correspondence, ... is recorded in every time series order. When the captured image determining unit 18 determines that the captured image D ₂ is a defective captured image D ₂ , the measurement information recording unit 20 c deletes the measurement value that is the measurement result of the state change of the measurement point P of the defective captured image D _2. . The determination information recording unit 20d is a part that records the determination results of the captured images D ₀ ′,... In time series order, and the determination results of the captured images D ₀ ′,. The determination information is recorded in time-series order at each time t ₀ ,... In correspondence with the captured images D ₀ ′,.

  The processing condition setting unit 21 illustrated in FIG. 3 is a unit that sets various processing conditions related to the image processing apparatus 9. The processing condition setting unit 21 is operated by a tester when, for example, inputting various information to the image processing apparatus 9 or instructing the image processing apparatus 9 to perform various operations. For example, the processing condition setting unit 21 is used by the tester when setting the delay time Δt shown in FIG. 5, the position of the measurement point P and the position of the shielding area A shown in FIG. 4, and the image information and rotation. Used by the tester when setting the recording start timing and recording end timing of the quantity information.

The information display unit 22 illustrated in FIG. 3 is a unit that displays various information regarding the image processing apparatus 9. The information display unit 22 is, for example, a captured image D ₀ ,... Captured by the imaging device 7 shown in FIG. 4, a captured image D ₀ ′ corrected by the image correction unit 15, a temperature T ₀ ,. And the evaluation result of the captured image D ₀ ′,... Are displayed on a liquid crystal screen or the like.

The program storage unit 23 shown in FIG. 3 processes time-sequential captured images D ₀ ,... Output from the image capturing device 7 in order to measure the time change of the measurement point P on the surface 6a of the brake disk 6. Means for storing the image processing program. The program storage unit 23 is, for example, a memory that stores an image processing program read from an information recording medium or an image processing program fetched through an electric communication line.

The control unit 24 is means (central processing unit (CPU)) for controlling various operations of the image processing apparatus 9. The control unit 24 reads the image processing program from the program storage unit 23 and instructs the computer of the image processing apparatus 9 to execute a predetermined process. For example, the control unit 24 instructs the image information recording unit 20a to record the image information input from the image information input unit 10, or calculates the rotation angle θ based on the rotation amount information input from the rotation amount information input unit 11. Is commanded to the rotation angle calculation unit 12, the rotation angle θ calculated by the rotation angle calculation unit 12 is commanded to the rotation angle correction unit 13, and the rotation angle information calculated by the rotation angle calculation unit 12 and the rotation angle correction are corrected. The rotation angle information recording unit 20b is instructed to record the rotation angle information corrected by the unit 13, the image correction unit 15 is instructed to correct the captured image D ₀ ,. captured image D ₀ ', or the command determination of ... quality of the captured image determination section 18, the judgment result recording or instructs the determination information recording section 20d of the captured image determination section 18, the corrected captured image D ₀ Measuring point P based on ', ... Instructs the state change measurement unit 19 to measure the state change, instructs the measurement information recording unit 20c to record the measurement result measured by the state change measurement unit 19, or measures based on the determination result of the captured image determination unit 18 The measurement information recording unit 20c is instructed to delete the result, and the processing conditions set by the processing condition setting unit 21 are stored in the delay time information storage unit 14, the measurement point position information storage unit 16, and the shielding body position information storage unit 17. The image information recording unit 20a and the rotation angle information recording unit 20b are instructed to start and end the recording of the image information and the rotation amount information based on the recording start timing and the recording end timing set by the processing condition setting unit 21. Or the information display unit 22 is instructed to display various information recorded by the information recording unit 20. The control unit 24 includes an image information input unit 10, a rotation amount information input unit 11, a rotation angle calculation unit 12, a rotation angle correction unit 13, a delay time information storage unit 14, an image correction unit 15, and a measurement point position information storage unit 16. The shield position information storage unit 17, the captured image determination unit 18, the state change measurement unit 19, the information recording unit 20, the processing condition setting unit 21, the information display unit 22, and the program storage unit 23 can communicate with each other. They are connected by communication means such as a bus.

Next, the operation of the image processing apparatus according to the embodiment of the present invention will be described.
FIG. 7 is a flowchart for explaining the operation of the image processing apparatus according to the embodiment of the present invention.
In step (hereinafter referred to as “S”) 100 shown in FIG. 7, initialization is performed by the image processing device 9. The rotational angle of the brake disk 6 in a stationary state so that the Y axis of the coordinate system with the rotation center O of the brake disk 6 shown in FIG. 4 as the origin coincides with the reference position P ₀ on the surface 6a of the brake disk 6. θ is set to the origin position θ = 0. Further, the processing condition setting unit 21 is operated by the tester, the integrated value of the pulse counter of the rotation angle calculation unit 12 is reset, and the rotation amount of the brake disk 6 is set to zero.

  In S <b> 200, coordinates are set by the image processing device 9. The processing condition setting unit 21 is operated by the tester, and the coordinates of the measurement point P and the coordinates of the shielding area A are defined with the rotation center O of the brake disk 6 as the origin of the coordinate system. When the coordinates of the measurement point P and the shielding area A are set by the processing condition setting unit 21, the measurement point position information and the shielding body position information are transmitted from the processing condition setting unit 21 to the control unit 24, and the measurement point position information is stored. The measurement point position information is stored in the unit 16, and the shield position information is stored in the shield position information storage unit 17.

  In S300, the brake disc 6 starts rotating. When the tester operates the disc brake test apparatus 1 and the wheel 2 rotates, the brake disc 6 rotates together with the wheel 2. As shown in FIG. 4, when the rotational speed of the brake disk 6 reaches a predetermined rotational speed, the friction material 4 is pressed against the friction surface 6 b of the brake disk 6, and the brake material 6 is braked between the friction surface 6 b and the friction material 4. A force is generated, and the brake disk 6 starts to decelerate at a substantially constant acceleration.

  In S400, the image processing apparatus 9 determines whether it is the recording start timing of the image information and the rotation amount information. When the tester operates the photographing device 7, the photographing device 7 starts photographing the surface 6a of the brake disc 6, and the photographing device 7 photographs the surface 6a of the brake disc 6 at an arbitrary timing. When the brake disk 6 rotates, the rotation amount detection device 8 detects the rotation amount of the brake disk 6. For example, when observing the tendency of the temperature change at the measurement point P after the braking force is applied to the brake disk 6, the tester sets the timing at which the brake disk 6 starts braking by the processing condition setting unit 21. . As a result, at the same time when the brake disk 6 starts braking, the control unit 24 commands the recording of the image information and the rotation amount information from the image information input unit 10 and the rotation amount information input unit 11. When the control unit 24 determines that it is the recording start timing of the image information and the rotation amount information, the process proceeds to S500, and when the control unit 24 determines that it is not the recording start timing of the image information and the rotation amount information, the recording start timing is reached. Until the control unit 24 repeats the determination.

In S500, the image processing apparatus 9 executes a predetermined image processing operation. As a result, the captured images D ₀ ,... Are recorded in the image information recording unit 20a, and the rotation angle θ is recorded in the rotation angle information recording unit 20b. In addition, the captured image D ₀ ′,... Is corrected by the image correcting unit 15, and the quality of the captured image D ₀ ′,. It is determined by the change measurement unit 19.

  In S600, the image processing apparatus 9 determines whether it is the recording end timing of the image information and the rotation amount information. For example, when observing the tendency of temperature rise at the measurement point P until the brake disk 6 stops rotating, the tester sets the timing at which the brake disk 6 stops rotating by the processing condition setting unit 21. As a result, at the same time as the brake disk 6 stops rotating, the control unit 24 instructs the recording stop of the image information and the rotation amount information from the image information input unit 10 and the rotation amount information input unit 11. Further, when observing the tendency of the temperature drop at the measurement point P until the brake disk 6 is lowered to the predetermined rotation speed, the processing condition setting unit 21 sets the timing until the brake disk 6 is lowered to the predetermined rotation speed. Set by the tester. As a result, the control unit 24 instructs the recording stop of the image information and the rotation amount information from the image information input unit 10 and the rotation amount information input unit 11 at the same time when the brake disk 6 is lowered to a predetermined rotation speed. Furthermore, when observing the tendency of the temperature drop at the measurement point P from when the brake disk 6 stops rotating until a predetermined time elapses, the timing from when the brake disk 6 stops rotating until the predetermined time elapses is processed. Set by the tester by the condition setting unit 21. As a result, the recording stop of the image information and the rotation amount information from the image information input unit 10 and the rotation amount information input unit 11 is instructed after a predetermined time has elapsed since the brake disk 6 stopped rotating. When the control unit 24 determines that it is the recording end timing of the image information and the rotation amount information, the series of image processing operations is ended. On the other hand, when the control unit 24 determines that it is not the recording end timing of the image information and the rotation amount information, the process returns to S400, and the processing after S400 is repeated until the recording end timing of the image information and the rotation amount information is reached.

Next, an image processing operation of the image processing apparatus according to the embodiment of the present invention will be described.
FIG. 8 is a flowchart for explaining the image processing operation of the image processing apparatus according to the embodiment of the present invention. Hereinafter, the operation of the control unit 24 will be mainly described.
In S510, the control unit 24 instructs the image information recording unit 20a and the rotation angle information recording unit 20b to record the captured image D ₀ ,... And the rotation angle θ. When image information is input from the photographing apparatus 7 to the control unit 24 through the image information input unit 10, the control unit 24 outputs the image information to the image information recording unit 20a, and the image information recording unit 20a controls the recording of the image information. Unit 24 commands. When rotation amount information is input from the rotation amount detection device 8 to the control unit 24 through the rotation amount information input unit 11, the rotation amount information is output to the rotation angle calculation unit 12, and the calculation of the rotation angle θ is performed. 12 is instructed by the control unit 24. When the rotation angle calculation unit 12 calculates the rotation angle θ of the brake disk 6 based on the pulse signal output from the rotation amount detection device 8, the rotation angle θ when the image information is input to the control unit 24 is rotated as the rotation angle information. The control unit 24 instructs the rotation angle information recording unit 20b to output the angle calculation unit 12 to the control unit 24 and record the rotation angle information in association with the image information.

  In S520, the control unit 24 commands the rotation angle correction unit 13 to correct the rotation angle θ, and the control unit 24 commands the rotation angle information recording unit 20b to record the corrected rotation angle θ. The control unit 24 reads the rotation angle information from the rotation angle information recording unit 20b and outputs the rotation angle information to the rotation angle correction unit 13, and also reads the delay time information from the delay time information storage unit 14 to obtain the delay time information. The output is output to the rotation angle correction unit 13, and the control unit 24 instructs the rotation angle correction unit 13 to correct the rotation angle θ. When the rotation angle correction unit 13 corrects the rotation angle θ based on the rotation angle θ shown in FIG. 4 and the delay time Δt shown in FIG. 5, the rotation angle correction unit 13 uses the corrected rotation angle θ as rotation angle information. The control unit 24 instructs the rotation angle information recording unit 20b to record the corrected rotation angle information in correspondence with the image information.

In S530, the control unit 24 instructs the image correction unit 15 to correct the captured images D ₀ ,. The control unit 24 reads the image information from the image information recording unit 20a, and the control unit 24 outputs the image information to the image correction unit 15. At the same time, the control unit 24 receives the corrected rotation angle information from the rotation angle information recording unit 20b. Is read, and the control unit 24 outputs the corrected rotation angle information to the image correction unit 15. As a result, as shown in FIG. 4, the image correction unit 15 executes a rotation correction process in which the captured images D ₀ ,... Are rotated in reverse in accordance with the corrected rotation angle θ in the direction opposite to the rotation direction of the brake disk 6. Then, the image correction unit 15 generates a corrected captured image D ₀ ′,... So that the measurement point P is located at the same position. Captured image D ₀ 'after the correction, the image correcting unit 15 ... as image information and outputs to the control unit 24, the control unit 24 the recording of the image information after the correction to the image information recording section 20a is commanded.

In S540, the control unit 24 commands the state change measurement unit 19 to measure the temperature of the measurement point P, and the control unit 24 commands the measurement information recording unit 20c to record the temperature of the measurement point P. The control unit 24 reads out the corrected image information from the image information recording unit 20 a and outputs the corrected image information to the state change measurement unit 19 and the captured image determination unit 18. As a result, as shown in FIG. 6, based on the temperature distribution in the predetermined pixel area in the corrected captured image D ₀ ′,..., The state change measurement unit 19 averages the temperature in this pixel area. To calculate. As shown in FIG. 4, when the state change measuring unit 19 measures the temperature T ₀ ,... Of the measurement point P in the corrected captured image D ₀ ′,..., The measurement result is output to the control unit 24 as measurement information. The measurement information recording unit 20c is instructed to record the measurement information in association with the corrected image information.

In S550, the control unit 24 instructs the captured image determination unit 18 to determine whether or not the measurement point P is blocked by the shield. The control unit 24 reads out the measurement point position information from the measurement point position information storage unit 16, and the control unit 24 outputs the measurement point position information to the captured image determination unit 18, and the shielding unit position information storage unit 17 outputs the shielding unit. The control unit 24 reads the position information, and the control unit 24 outputs the shield position information to the captured image determination unit 18. As a result, for example, as shown in FIG. 4, when the shielding area A and the measurement point P do not overlap, the temperatures T ₀ , T of the measurement points P of the corrected captured images D ₀ ′, D ₁ ′, D ₃ ′ are corrected. _The captured image determination unit 18 determines that ₁ and T ₃ are valid as measured values. On the other hand, when the shielding area A and the measurement point P overlap, the captured image determination unit 18 determines that the temperature T _{2 at} the measurement point P of the corrected captured image D ₂ ′ is incorrect as the measurement value. When the captured image determination unit 18 outputs the determination result as determination information to the control unit 24, the control unit 24 outputs this determination information to the determination information recording unit 20d, and this determination is made in correspondence with the corrected captured image and temperature information. The control unit 24 instructs the determination information recording unit 20d to record information. When the captured image determination unit 18 determines that the measurement point P is shielded by the shield, the process proceeds to S560. When the captured image determination unit 18 determines that the measurement point P is not shielded by the shield, the process proceeds to S570.

In S560, the control unit 24 instructs the measurement information recording unit 20c to delete the measurement information at the measurement point P. For example, when the captured image determination unit 18 determines that the measurement value at the measurement point P at time t ₂ is an illegal value, the control unit 24 in the measurement information recording unit 20c excludes the temperature T ₂ that is the incorrect value. Command.

In S570, the control unit 24 instructs the information display unit 22 to display the corrected captured image D ₀ ′,... And the temperature T ₀ ,. The control unit 24 reads out the corrected image information from the image information recording unit 20a, the control unit 24 outputs the corrected image information to the information display unit 22, and the measurement information from the state change measurement unit 19 is transmitted to the control unit. 24 reads out, and the measurement unit 24 outputs this measurement information to the information display unit 22. As a result, as shown in FIG. 4, the information display unit 22 displays on the screen the photographic images D ₀ ′,... Corrected in chronological order where the measurement point P is at the same position, and the measurement point P The information display unit 22 displays the time series temperature T ₀ ,... On the screen.

The image processing apparatus and the image processing program according to the embodiment of the present invention have the following effects.
(1) In this embodiment, the rotation angle calculation unit 12 calculates the rotation angle θ of the brake disk 6 based on the rotation amount detection signal output from the rotation amount detection device 8 that detects the rotation amount of the brake disk 6. , the captured image D ₀ of the chronological order, ... as the measuring point P of the medium is at the same position, the captured image D ₀ of the chronological order based on the rotation angle θ of the brake disc 6, ... image correction The part 15 corrects. Therefore, by detecting the rotation angle θ of the brake disc 6 is subject, discrete and captured image D obtained in irregular intervals _0, ... the captured image D _0, ... measurement point P is the same position of the medium The captured images D ₀ ,... Can be easily corrected so that

(2) In this embodiment, the photographic images are arranged in chronological order based on the rotation angle θ of the brake disk 6 so that the coordinates of the measurement point P are the same when the rotation center O of the brake disk 6 is the origin. The image correction unit 15 corrects D ₀ ,. For this reason, for example, by rotating the captured images D ₀ ,... In chronological order by simple coordinate conversion, the still image is rotated without rotating the brake disk 6 and the rotating subject is always stationary at the same position. Can be observed.

(3) the brake disc 6 when this embodiment, the chronological order of the captured image D _0, ... image recording section 20a is recorded as image information, the captured image D ₀ of the time series, which were taken ... The rotation angle information recording unit 20b records the rotation angle θ as the rotation angle information in association with the captured images D ₀ ,. Therefore, the chronological order of the captured image D _0, ... each captured image D _0, Record ... in association with the rotation angle θ at the time of shooting, the chronological order of the captured image D _0, ... measured in This time-series captured image D ₀ ,... Can be easily corrected so that the point P has the same posture.

(4) In this embodiment, the captured image D _0, ... shooting start time t ₀ of, ... captured image D ₀ of Toko, ... recording completion time t ₀₂ of, ... when the delay time Δt exists between, The rotation angle information recording unit 20b records the rotation angle θ of the brake disk 6 before the delay time Δt as rotation angle information in association with the captured images D ₀ ,. For example, the imaging timing cannot be commanded from the image processing device 9 side to the imaging device 7 side, and the imaging device 7 may take an appropriate image at an arbitrary control timing and transfer image information to the image processing device 9 side. . In this case, the photographing start signal is not transmitted from the photographing device 7 side to the image processing device 9 side, and the photographing time of the photographed images D ₀ ,... Is unknown on the image processing device 9 side. In this embodiment, this time t ₀₂ is based on the timing (recording completion flag (time t ₀₂ ,...)) When the image processing device 9 has completed reception of the captured image D _{0 ,.} , ... time t ₀ going back delay time Δt than, ... the rotation angle θ of the captured image D _0, are treated as the rotation angle θ in ... shooting time. Specifically, the captured image D _0, regardless of the timing of receiving a ... constantly Record the rotation angle θ of the brake disc 6 at a high frequency of sampling, the captured image D _0, is ... recording completion flag of The rotation angle θ of the brake disk 6 at the time t ₀ ,... Before the standing time t ₀₂ ,. As a result, the rotation angle θ of the brake disk 6 at the time of photographing the photographed images D ₀ ,... Can be accurately recorded without instructing the photographing operation or the like from the image processing device 9 side to the photographing device 7 side.

(5) In this embodiment, the photographic images D ₀ , chronologically ordered in the direction opposite to the rotation direction of the brake disk 6 by the rotation angle θ of the brake disk 6 with the rotation center O of the brake disk 6 as the origin. Are rotated, and the image correction unit 15 corrects the photographic images D ₀ ,. Therefore, it is possible to easily perform image processing on the corrected captured image D ₀ ′,... In which the brake disk 6 as the subject is fixed and the position of the measurement point P is always the same position.

(6) In this embodiment, when the imaging device 7 is a thermal imaging device, the measurement points P in the time-series sequential thermal images output by the thermal imaging device are at the same position at this time. The image correction unit 15 corrects the thermal images in the sequence order. For this reason, the time change of the temperature distribution of the surface 6a of the brake disc 6 can be clearly observed. For example, by defining a certain element (measurement point) on the surface 6a of the brake disk 6 with polar coordinates, it is possible to easily check the time change of the temperature distribution at the measurement point based on the thermal image corrected for rotation.

(7) In this embodiment, based on the chronologically captured images D ₀ ′,... Corrected by the image correcting unit 15, the state change of the measurement point P in the chronologically captured images D ₀ ′,. Is measured by the state change measuring unit 19. For this reason, the time change of the surface 6a of the brake disc 6 rotating at high speed at an arbitrary rotation number can be easily observed. As a result, the measurement result of the state change measuring unit 19 can be used to design and evaluate an apparatus that rotates at high speed and causes a temperature change.

(8) In this embodiment, when a defective captured image D _{2 in} which the shielding body that shields the surface 6 a of the brake disk 6 overlaps the measurement point P exists in the captured images D ₀ ,. The state change measuring unit 19 measures the change in the state of the predetermined measurement point P, excluding the measurement result of the state change of the measurement point P in the defective photographed image D ₀ ,. For this reason, when the predefined shielding area A and the coordinates of the measurement point P overlap, the measurement value of the measurement point P can be excluded as an incorrect value, and the tendency of the state change of the measurement point P can be accurately captured. .

(9) In this embodiment, when the photographing device 7 is a thermal image photographing device, the state change measuring unit 19 detects the temperature change of the measurement point P in the time-series sequential thermal image output by the thermal image photographing device. taking measurement. For this reason, even when the brake disk 6 as a subject rotates at a high speed at an unspecified number of revolutions, the measurement points P of the brake disk 6 in a fixed state are based on the thermal images obtained at discrete and indefinite intervals. It is possible to clearly grasp the tendency of the temperature rise and the time change of cooling to confirm the heat resistance effect of the friction surface 6b of the brake disk 6 and the cooling effect of the fin portion. In addition, since the shield member such as the friction material 4 and the support 5 in the stationary state is shielded, even if a concealed portion where the surface 6a of the brake disk 6 cannot be photographed by the photographing device 7 is generated, the concealed portion is previously stored. By designating, it is possible to capture the time change of the temperature distribution excluding the influence of the concealed portion. For example, as shown in FIG. 4, the temperature T _{2 at the} measurement point P at the time t _{2 when} the measurement point P is hidden by the shielding area A is measured as 0, and the temperature is measured only at the time t _{2 as} shown by a two-dot chain line in the figure. Inaccurate temperature changes that lower the temperature. In this embodiment, the temperature T ₂ = 0 at time t ₂ when the measurement point P is hidden by the shielding area A is excluded, and the measurement point P at time t ₀ , t ₁ , t ₃ ,. An accurate temperature change can be grasped by the temperatures T ₀ , T ₁ , T ₃ ,.

(10) In this embodiment, when the surface of the rotating body is the brake disc 6 of the disc brake device 3, the state change measuring unit 19 measures the temperature change at the measurement point P on the surface 6 a of the brake disc 6. . For this reason, it is possible to grasp the tendency of the temperature increase and the tendency of cooling of the brake disc 6 during braking of the disc brake device 3 in time series. Further, for example, by defining a specific portion as the measurement point P among the upper surface or the top surface of the fastening bolt, the upper surface of the fastening nut, etc. of the fastening bolts of a large number of fixing members 6c, It is possible to clearly grasp the temperature change and the cooling tendency of these portions.

(11) In this embodiment, when the photographing device 7 is a thermal image photographing device, the measurement point P in the time-series sequential thermal image output by the thermal image photographing device and the surroundings of the measurement point P are included. The state change measuring unit 19 measures the state change at the measurement point P by averaging the temperatures in the plurality of pixel regions. For this reason, even if the temperature around the measurement point P varies, the temperature in the pixel region is averaged based on the temperature distribution in the predetermined pixel region, and the temperature at the measurement point P is uniquely set as a representative value. Can be determined.

The present invention is not limited to the embodiment described above, and various modifications or changes can be made as described below, and these are also within the scope of the present invention.
(1) In this embodiment, a case where a plane (orthogonal plane) intersecting the rotation axis 2a of the plate-like rotating body is imaged by the imaging device 7 has been described as an example. The present invention can also be applied to a case where a surface (front surface) is imaged by the imaging device 7. In this case, after continuously photographing the outer peripheral surface of the rotating body, a captured image corresponding to the rotation angle of the rotating body when the measurement point on the outer peripheral surface of the rotating body faces the front of the imaging device is extracted. Then, by arranging the captured images in chronological order, a captured image of the outer peripheral surface of the rotating body can be obtained in a simulated manner. In this embodiment, the case where the brake disk 6 rotating at a fixed position is photographed by the photographing device 7 and image processing is performed by the image processing device 9 has been described as an example. However, the embodiment is limited to such a usage method. is not. For example, the brake disk 6 or the wheel 2 of a railway vehicle traveling on a track can be photographed by the photographing device 7 installed on the cart side or the vehicle body side, and image processing can be performed by the image processing device 9. Furthermore, in this embodiment, the case where the rotating body is the brake disk 6 has been described as an example, but the present invention can also be applied to other rotating bodies such as the wheels 2.

(2) In this embodiment, the case where the temperature change of the surface 6a of the brake disk 6 is measured has been described as an example, but the present invention is not limited to the measurement of the temperature change. For example, a damaged state or a worn state of the brake disc 6 or the wheel 2 can be measured. In this embodiment, the case where the photographing apparatus 7 is a thermal image photographing apparatus has been described as an example. However, the present invention can also be applied to a high-speed photographing apparatus for visible light. In this case, the damage state or wear state of the brake disc 6 or the wheel 2 can be measured.

(3) In this embodiment, the case where the encoder is attached to the rotating shaft 2a of the wheel 2 and the rotation angle θ of the brake disk 6 is calculated has been described as an example, but the wheel 2 of the disk brake test apparatus 1 is rotated. It is also possible to calculate the rotation angle θ of the brake disc 6 using the control pulse of the DC motor. In this embodiment, the case where the recording start timing and the recording end timing of the image information and the rotation amount information are set by the processing condition setting unit 21 has been described as an example. However, the present invention is not limited to such setting conditions. Absent. For example, the rotation angle calculation unit 12 also calculates the rotation speed based on the pulse signal output from the rotation amount detection device 8, and sets the recording start timing and recording end timing of the image information and the rotation amount information based on the rotation speed. You can also.

1 Disc brake test device 2 Wheel (rotating body)
2a Rotating shaft 3 Disc brake device 4 Friction material (shield)
5 Support (shield)
6 Brake disc (rotating body)
6a Surface 6b Friction surface 6c Fixed member 7 Imaging device 8 Rotation amount detection device 9 Image processing device 10 Image information input unit 11 Rotation amount information input unit 12 Rotation angle calculation unit 13 Rotation angle correction unit 14 Delay time information storage unit 15 Image correction Unit 16 measurement point position information storage unit 17 shield position information storage unit 18 photographed image determination unit 19 state change measurement unit 20 information recording unit 20a image information recording unit 20b rotation angle information recording unit 20c measurement information recording unit 20d determination information recording unit 21 processing condition setting unit 22 information display unit 23 program storage unit 24 control unit P measurement point P ₀ reference position θ ₀ declination angle θ rotation angle D ₀ , D ₁ , D ₂ , D ₃ photographed images D ₀ ′, D ₁ ′ , D ₂ ′, D ₃ ′ corrected captured images t ₀ , t ₁ , t ₂ , t ₃ time (shooting start time)
t _02, t ₁₂ time (recording completion time)
t _11, t ₁₂ time (transfer start time)
Δt Delay time O Center of rotation A Shielding area

Claims (22)

An image processing device that processes chronologically captured images output by a photographing device that photographs the surface of the rotating body with a time interval in order to measure a time change of a predetermined measurement point on the surface of the rotating member. There,
Based on a rotation amount detection signal output from a rotation amount detection device that detects the rotation amount of the rotating body, a rotation angle calculation unit that calculates the rotation angle of the rotating body;
An image correction unit that corrects the time-ordered captured image based on the rotation angle of the rotating body so that the predetermined measurement points in the time-sequenced captured image are at the same position;
An image processing apparatus comprising: The image processing apparatus according to claim 1.
The image correction unit corrects the captured images in the time series order based on the rotation angle of the rotating body so that the coordinates of the predetermined measurement point are the same when the rotation center of the rotating body is the origin. To do,
An image processing apparatus. The image processing apparatus according to claim 1 or 2,
An image information recording unit for recording the chronologically taken images as image information;
A rotation angle information recording unit that records the rotation angle of the rotating body when the captured images in the time series order are captured as rotation angle information, in association with the captured images in the time series order;
An image processing apparatus. The image processing apparatus according to claim 3.
When there is a delay time between the shooting start time of the captured image and the recording completion time of the captured image, the rotation angle information recording unit rotates the rotation angle of the rotating body by the delay time. As angle information, record in correspondence with the chronologically captured images,
An image processing apparatus. The image processing apparatus according to any one of claims 1 to 4, wherein:
The image correction unit rotates the captured images in the time series order with the rotation center of the rotating body as an origin in the direction opposite to the rotation direction of the rotating body by the rotation angle of the rotating body. Correct the sequence of captured images,
An image processing apparatus. The image processing apparatus according to any one of claims 1 to 5, wherein:
The image correction unit is configured so that, when the photographing apparatus is a thermal image photographing apparatus, the predetermined measurement points in the time-series sequential thermal images output by the thermal image photographing apparatus are at the same position. Correcting thermal images in sequence order,
An image processing apparatus. The image processing apparatus according to any one of claims 1 to 6,
A state change measuring unit that measures a state change of the predetermined measurement point in the time-sequential captured image based on the time-sequential captured image corrected by the image correcting unit;
An image processing apparatus. The image processing apparatus according to claim 7.
The state change measuring unit may include a defective captured image in which the shield that shields the surface of the rotating body and the predetermined measurement point are present in the time-sequential captured image. Excluding the measurement result of the state change of the predetermined measurement point, and measuring the state change of the predetermined measurement point;
An image processing apparatus. The image processing apparatus according to claim 7 or 8,
The state change measuring unit measures a temperature change at the predetermined measurement point in the time-series sequential thermal image output by the thermal image capturing device when the image capturing device is a thermal image capturing device;
An image processing apparatus. The image processing apparatus according to claim 9.
The state change measuring unit measures a temperature change at the predetermined measurement point on the surface of the brake disc when the surface of the rotating body is a brake disc of a disc brake device;
An image processing apparatus. The image processing apparatus according to claim 9 or 10,
The state change measurement unit includes the predetermined measurement point in the time-series sequential thermal image output by the thermal image capturing device and the periphery of the measurement point when the imaging device is a thermal image capturing device. Averaging the temperature in a plurality of pixel regions to measure the state change at the predetermined measurement point;
An image processing apparatus. An image processing program for processing captured images in time series output from an imaging device that captures the surface of the rotating body with a time interval in order to measure a time change of a predetermined measurement point on the surface of the rotating body. There,
Based on a rotation amount detection signal output by a rotation amount detection device that detects the rotation amount of the rotating body, a rotation angle calculation procedure for calculating the rotation angle of the rotating body;
An image correction procedure for correcting the time-ordered captured image based on the rotation angle of the rotating body so that the predetermined measurement points in the time-sequenced captured image are at the same position;
Image processing program including In the image processing program according to claim 12,
The image correction procedure corrects the captured images in the time series order based on the rotation angle of the rotating body so that the coordinates of the predetermined measurement point are the same when the rotation center of the rotating body is the origin. Including steps to
An image processing program characterized by the above. In the image processing program according to claim 12 or 13,
An image information recording procedure for recording the time-sequential captured images as image information;
A rotation angle information recording procedure for recording, as rotation angle information, the rotation angle of the rotator when the captured images in the time-series order are captured, corresponding to the captured images in the time-series order;
An image processing program characterized by the above. The image processing program according to claim 14,
In the rotation angle information recording procedure, when there is a delay time between the shooting start time of the captured image and the recording completion time of the captured image, the rotation angle of the rotating body before the delay time is rotated. Including a procedure for recording the angle information in correspondence with the captured images in time-series order,
An image processing program characterized by the above. The image processing program according to any one of claims 12 to 15,
The image correction procedure includes rotating the captured images in the time series order with the rotation center of the rotating body as an origin in the direction opposite to the rotation direction of the rotating body by the rotation angle of the rotating body. Including a procedure for correcting the sequence of captured images,
An image processing program characterized by the above. The image processing program according to any one of claims 12 to 16,
The image correction procedure is such that when the photographing apparatus is a thermal image photographing apparatus, the predetermined measurement points in the time-series sequential thermal images output by the thermal image photographing apparatus are at the same position. Including a procedure for correcting a sequence-order thermal image;
An image processing program characterized by the above. The image processing program according to any one of claims 12 to 17,
Including a state change measurement procedure for measuring a state change of the predetermined measurement point in the time-series ordered captured image based on the time-series ordered captured image corrected in the image correction procedure;
An image processing program characterized by the above. The image processing program according to claim 18,
In the state change measurement procedure, when a defective captured image in which the shield that shields the surface of the rotating body and the predetermined measurement point are present in the captured image in time series order, Including the step of measuring the change in the state of the predetermined measurement point by excluding the measurement result of the state change in the predetermined measurement point of
An image processing program characterized by the above. The image processing apparatus according to claim 18 or 19,
The state change measurement procedure includes a procedure for measuring a temperature change at the predetermined measurement point in the time-series sequential thermal image output by the thermal image capturing device when the image capturing device is a thermal image capturing device. Including,
An image processing program characterized by the above. The image processing program according to claim 20,
The state change measurement procedure includes a procedure of measuring a temperature change at the predetermined measurement point on the surface of the brake disk when the surface of the rotating body is a brake disk of a disk brake device.
An image processing program characterized by the above. In the image processing program according to claim 20 or claim 21,
The state change measurement procedure includes the predetermined measurement point in the time-series sequential thermal image output by the thermal image capturing device and the periphery of the measurement point when the image capturing device is a thermal image capturing device. Including a procedure of averaging the temperature in a plurality of pixel regions and measuring a change in state of the predetermined measurement point;
An image processing program characterized by the above.

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