JP6818339B2 - Measuring instrument - Google Patents

Description

The present invention relates to an instrument (also referred to as a calibration plate, a calibration tool, etc.) used for measuring the dimensions of a measurement object such as a steel plate.

In the steel sheet manufacturing line, the steel sheet is imaged using an imaging device such as a CCD camera, the edge of the steel sheet is detected based on the captured image, and the length and width of the steel sheet are measured. At that time, the calibration plate and the steel plate are imaged, the relative ratio between the dimensions of the steel plate and the dimensions of the calibration plate in the captured image is obtained, and the actual steel plate is based on this relative ratio and the known actual dimensions of the calibration plate. The dimensions of can be calculated.

Patent Document 1 describes a calibration plate having a plurality of holes. Both ends of these holes are used as an edge reference and a width reference.

Japanese Unexamined Patent Publication No. 2016-31309

By the way, since the temperature of the steel sheet heated non-uniformly in the manufacturing process becomes non-uniform depending on the place, the color of the light emitted from those places also differs. Here, there is a problem that the place (a part of the steel plate) that emits light of a specific color cannot be accurately captured depending on the situation such as a defect in the image sensor of the image pickup device or a high environmental temperature. .. In this case, if an attempt is made to measure the dimensions of the steel sheet by image processing on the captured image, the wrong dimensions are measured or an error occurs.

An object of the present invention is to provide a measuring instrument used for obtaining an appropriate captured image when measuring the dimensions of a measurement object such as a steel plate.

One aspect of the present invention that solves the above problems is a measuring instrument used for measuring the size of an object in a captured image, which is provided on a main body and the main body and has at least one emission color of light. It is provided with a light source unit that emits light.

In the above-mentioned measuring instrument, the light source unit can emit light of a plurality of different emission colors, and may emit light corresponding to the emission color selected from the plurality of emission colors.

Any of the above measuring instruments may be provided with a plurality of the light source units at positions separated from each other.

Any of the above measuring instruments includes a first light source unit and a second light source unit at positions separated from each other, and the first light source unit includes a light source of a first light emission color and a second light source. The second light source unit includes a light source of color, the second light source unit includes a light source of the first emission color and a light source of the second emission color, and the first light source unit and the second light source unit. The distance between the pair of light sources of the first emission color belonging to the above and the pair of light sources of the second emission color belonging to the first light source unit and the second light source unit are the same color. May be arranged so that they are equal.

In any of the above measuring instruments, the plurality of light sources of the first light source unit are arranged in a row along the first direction, and the plurality of light sources of the second light source unit are the first. The light sources may be arranged in a row along the first direction in the same color order as the plurality of light sources.

In any of the above measuring instruments, a through hole corresponding to each light source is formed in the main body portion, and each light source is housed in the corresponding through hole and surrounded by an inner wall of the through hole. You may.

In any of the above measuring instruments, at least one of the plurality of light sources may have an emission color in the near infrared region.

In any of the above measuring instruments, each light source may be composed of an LED.

In any of the above measuring instruments, the main body may be made of a composite material containing carbon fibers.

It is a figure which shows the structural example of the measuring instrument which concerns on one Embodiment of this invention. It is a figure explaining the detailed configuration example of a main body part and a light source part. It is a figure explaining the arrangement and the reference dimension of a plurality of light sources. It is a flowchart which shows an example of the inspection process of the captured image using the measuring instrument. It is a figure which shows the installation example of the measuring instrument.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a steel plate will be described as an example as a measurement object.

FIG. 1 is a diagram showing a configuration example of a measuring instrument 1 according to an embodiment of the present invention, in which (A) top view, (B) bottom view, (C) front view, and (D) right side view. Shown. The back surface is the same as the front surface, so it is omitted. The left side surface is the same as the right side surface, so it is omitted.

The measuring instrument 1 is used to determine the reference dimension when measuring the dimension of the steel sheet. That is, the measuring instrument 1 and the steel plate are individually imaged using an imaging device such as a CCD camera, and the relative ratio between the dimensions of the steel plate and the dimensions of the measuring instrument 1 in these captured images is obtained. The actual dimensions of the steel sheet can be calculated based on the known dimensions of the actual measuring instrument 1. Further, the measuring instrument 1 is used for inspecting an abnormality in the captured image. The usage of the measuring instrument 1 will be described in detail later.

The measuring instrument 1 includes a main body 2, four light sources 3, a power supply 4, five legs 5, and two handles 6.

The main body 2 is formed in a flat plate shape, and in the example of FIG. 1, the main body 2 is formed so that the length direction (horizontal direction in the figure) and the width direction (vertical direction in the figure) are substantially equal. As a specific example, the main body 2 can be a rectangle having a length of 1 m and a width of 1 m. As the material of the main body 2, for example, iron, stainless steel, glass, etc. can be adopted, but preferably, carbon fiber having good dimensional stability (excellent in thermal elasticity) is combined with synthetic resin or metal. Composite materials can be used.

The four light source units 3 (3a, 3b, 3c, 3d) are provided at the four corners of the corresponding main body units 2, respectively. The light source unit 3 is, for example, an electronic circuit board, and includes three light sources 31 having different emission colors. Further, the light source unit 3 receives power from the power supply unit 4 and turns on / off each light source 31 individually. The light source unit 3 will be described in detail later.

The power supply unit 4 is connected to the four light source units 3 and supplies power to them. The power supply unit 4 is, for example, an electronic circuit board including a battery (not shown) such as a dry battery and a switch (not shown). The switch can individually switch on / off of the three light sources 31 of each light source unit 3. For example, when the first switch is set to on (off), the first light source 31 of each light source unit 3 is turned on (off), and when the second switch is set to on (off), each is When the second light source 31 of the light source unit 3 is turned on (off) and the third switch is set to on (off), the third light source 31 of each light source unit 3 is turned on (off).

The five leg portions 5 are provided at the central portion and the four corner portions of the lower surface of the main body portion 2, respectively. When the measuring instrument 1 is placed on the installation surface of a steel plate or the like, each leg portion 5 comes into contact with the installation surface and supports the main body portion 2. Of course, the shape, number and arrangement of the legs 5 are not limited to the illustrated examples. The leg portion 5 may not be provided on the measuring instrument 1.

The two handle portions 6 are provided at the left and right ends of the upper surface of the main body portion 2, respectively. Each handle portion 6 is gripped by an operator when moving the measuring instrument 1. Of course, the shape, number, and arrangement of the handle portions 6 are not limited to the illustrated examples. The handle portion 6 may not be provided on the measuring instrument 1.

FIG. 2 is a view for explaining a detailed configuration example of the main body portion 2 and the light source portion 3, and shows (A) a top view and (B) a front view. FIG. 2 shows an enlarged view of the lower left corner of the measuring instrument 1 of FIG.

The light source portion 3b is arranged below the main body portion 2, and is fixed to the main body portion 2 by a fixing means such as a screw. The three light sources 31 (31a, 31b, 31c) having different emission colors are, for example, bullet-shaped LEDs (Light Emitting Diodes), which are provided on the upper surface of the light source unit 3b so as to extend upward. Further, the main body 2 is provided with three through holes 21a to 21c for connecting the upper surface and the lower surface of the main body 2 corresponding to each of the light sources 31a to 31c. The light sources 31a to 31c are housed in the corresponding through holes 21a to 21c. In the example of FIG. 2B, the upper end portion of the light source 31 (the upper end portion of the head of the LED) partially protrudes, but it may be housed in the through hole so as not to protrude.

By accommodating the light source 31 in the through hole 21 formed in the main body 2, the outer circumference of the light source 31 is surrounded by the inner wall of the through hole 21. As a result, the diffusion of the light emitted from the outer periphery of the light source 31 is suppressed, so that the light source 31 can be more clearly captured in the captured image when the image is taken from above the main body 2. In addition, the position of the light source 31 can be more accurately specified by image processing on the captured image.

At least one of the three light sources 31 can be, for example, an emission color in the near infrared region. At least one of the three light sources 31 may be, for example, an emission color in the visible light region. As a specific example, the three light sources 31 include an LED that emits light having a wavelength of 750 nm (visible light), an LED that emits light having a wavelength of 850 nm (near infrared rays), and light having a wavelength of 940 nm (near infrared rays). It can be an LED that emits light.

The heated steel sheet emits near infrared rays. In this case, if an imaging device capable of capturing only the visible light region is used, a portion that is not captured in the captured image will be included. Therefore, it is desirable to use an imaging device capable of imaging not only the visible light region but also the near infrared region. Although the details will be described later, it is determined whether or not the image sensor of the image pickup device can accurately image the near infrared ray by imaging the measuring instrument 1 in which the near infrared light source 31 is turned on with the image pickup device and inspecting the captured image. can do. Further, by imaging the measuring instrument 1 in which the light source 31 of visible light is turned on with an imaging device and inspecting the captured image, it is possible to determine whether or not the imaging element of the imaging device can accurately image visible light. ..

The other light source units 3a, 3c, and 3d are also arranged below the main body unit 2 in the same manner as the light source unit 3b. Further, the light sources 31a to 31c of the other light sources 3a, 3c, and 3d are also housed in the corresponding through holes 21a to 21c formed in the main body 2 in the same manner as the light sources 31a to 31c of the light source 3b. To.

FIG. 3 is a diagram for explaining the arrangement and reference dimensions of the plurality of light sources 31. In FIG. 13, the left-right direction is the length direction, and the up-down direction is the width direction.

The four light source units 3a to 3d each have light sources 31a to 31c having three different emission colors. The light sources 31a to 31c of each light source unit 3 are arranged in a row in the order of the light sources 31a, 31b, 31c from the left in the length direction. The light sources 31a to 31c of the light source unit 3a and the light sources 31a to 31c of the light source unit 3b are arranged so that the distance between the light sources of the same emission color is the reference width W. Further, the light sources 31a to 31c of the light source unit 3a and the light sources 31a to 31c of the light source unit 3c are arranged so that the distance between the light sources of the same emission color is the reference length L. Further, the light sources 31a to 31c of the light source unit 3d and the light sources 31a to 31c of the light source unit 3c are arranged so that the distance between the light sources of the same emission color is the reference width W. Further, the light sources 31a to 31c of the light source unit 3d and the light sources 31a to 31c of the light source unit 3b are arranged so that the distance between the light sources of the same emission color is the reference length L.

Due to such an arrangement of the light sources 31, the distance between the light sources 31 of a certain emission color (distance in the length direction and the width direction) and the distance between the light sources 31 of another emission color (distance in the length direction and the width direction) Is set equally as the reference length L and the reference width W.

FIG. 4 is a flowchart showing an example of an inspection process of a captured image using the measuring instrument 1. This flowchart is executed as a preparatory step prior to the step of imaging the steel sheet and measuring its dimensions.

First, the measuring instrument 1 is installed (step S1). For example, as shown in FIG. 5 (a diagram showing an installation example of a measuring instrument), an operator places a flat plate 7 on the upper surface of a conveyor A for transporting a steel plate to be measured, and the measuring instrument is placed on the upper surface thereof. Put one. At that time, the measuring instrument 1 is arranged so as to be included in the imaging range of one or more imaging devices 8 mounted on the ceiling B. Of course, the number, arrangement, and the like of the image pickup apparatus 8 are not limited to the example shown in FIG.

Then, the light source of the first color is turned on (step S11). For example, the operator operates the switch of the power supply unit 4 to light the light source 31a of each light source unit 3.

Then, the measuring instrument 1 is imaged (step S12). For example, the operator operates a measuring device (not shown) communicatively connected to each imaging device 8. The measuring device controls each imaging device 8 to take an image of the measuring instrument 1. The measuring device receives the captured image from each imaging device 8. The measuring device is, for example, a computer device such as a PC (Personal Computer), and software having a function of analyzing an captured image by image processing and measuring the dimensions of a steel plate to be measured is installed.

Then, the captured image is inspected (step S13). For example, the measuring device displays the received captured image on the display device. The operator looks at the displayed captured image and inspects whether or not all the light sources 31a are clearly captured. The inspection process for whether or not the light source 31a is clearly reflected may be executed by the measuring device.

Then, it is determined whether or not there is an abnormality in the captured image (step S14). For example, based on the inspection result in step S13, the operator can determine that there is an abnormality in at least imaging of the emission color of the light source 31a when one or more light sources 31a are not clearly captured. In such a case, there is a possibility that the image sensor of the image pickup device 8 has a problem or the environmental temperature is high. The process of determining whether or not there is an abnormality in the captured image may be executed by the measuring device.

When it is determined that there is an abnormality in the captured image (Y in step S14), the flowchart shown in FIG. 4 ends. In this case, for example, the operator may take measures such as repairing a defect in the image pickup apparatus 8 and improving the image pickup environment, and start the process of this flowchart again.

When it is determined that there is no abnormality in the captured image (N in step S14), the light source of the second color is turned on (step S21). For example, the operator operates the switch of the power supply unit 4 to turn off the light source 31a of each light source unit 3 and turn on the light source 31b of each light source unit 3.

Then, the measuring instrument 1 is imaged (step S22). Step S22 is the same as step S12.

Then, the captured image is inspected (step S23). Step S23 is the same as step S13 except that it is executed for the light source 31b.

Then, it is determined whether or not there is an abnormality in the captured image (step S24). Step S24 is the same as step S14 except that it is executed for the light source 31b.

When it is determined that there is an abnormality in the captured image (Y in step S24), the flowchart shown in FIG. 4 ends. In this case, for example, the operator may take measures such as repairing a defect in the image pickup apparatus 8 and improving the image pickup environment, and start the process of this flowchart again.

When it is determined that there is no abnormality in the captured image (N in step S24), the light source of the third color is turned on (step S31). For example, the operator operates the switch of the power supply unit 4 to turn off the light source 31b of each light source unit 3 and turn on the light source 31c of each light source unit 3.

Then, the measuring instrument 1 is imaged (step S32). Step S32 is the same as step S12.

Then, the captured image is inspected (step S33). Step S33 is the same as step S13 except that it is executed for the light source 31c.

Then, it is determined whether or not there is an abnormality in the captured image (step S34). Step S34 is the same as step S14 except that it is executed for the light source 31c.

When it is determined that there is an abnormality in the captured image (Y in step S34), the flowchart shown in FIG. 4 ends. In this case, for example, the operator may take measures such as repairing a defect in the image pickup apparatus 8 and improving the image pickup environment, and start the process of this flowchart again.

When it is determined that there is no abnormality in the captured image (N in step S34), the measuring instrument 1 is removed (step S41). For example, the operator may turn off the light source 31c of each light source unit 3 and remove the measuring instrument 1 and the flat plate 7 from the conveyor A.

In this way, the flowchart shown in FIG. 4 ends. The measuring device analyzes, for example, the captured image received in any of steps S12, S22, and S32, identifies the position of the light source 31 that emits light, and determines the distance between the specified positions as a reference dimension (reference length). And the reference width) may be recorded. After that, the measuring device, for example, images the steel plate on the conveyor A, obtains the relative ratio between the dimensions of the steel plate in the captured image and the reference dimension of the measuring instrument 1, and obtains this relative ratio and the actual measurement set in advance. The actual size of the steel plate may be calculated based on the size of the tool 1.

Of course, the inspection process is not limited to the example of the flowchart shown in FIG. For example, the inspection may be performed only on the light source 31 of any one or two emission colors. Further, for example, when it is determined that the captured image of a certain emission color is abnormal, the next emission color may be captured.

The embodiment of the present invention has been described above. By using the measuring instrument 1 of the present embodiment, it is possible to obtain an appropriate captured image when measuring the dimensions of a measurement object such as a steel plate.

For example, the measuring instrument 1 is provided with a light source 31 and can be turned on. Thereby, the abnormality can be determined based on the appearance of the light source 31 in the captured image. Further, for example, the measuring instrument 1 includes a plurality of light sources 31 of light emitting colors, and can light the light sources 31 of the selected light emitting colors. As a result, it is possible to determine the abnormality in more detail based on how the light sources of each color appear in the captured image. Further, for example, since the lit light source 31 is clearly captured in the captured image, the operator or the measuring device can easily specify the reference dimension. Further, for example, by making the measuring instrument 1 from a composite material containing carbon fibers, the influence of the environmental temperature can be reduced and the reference dimensions can be measured stably.

The above embodiments of the present invention are intended to illustrate, but are not limited to, the gist and scope of the present invention. For example, the arrangement, dimensions, shape, and the like of each part of the measuring instrument are not limited to the illustrated examples as long as the object of the present invention can be achieved. Further, for example, although a word such as "flat plate" is used, the meaning is not limited to the exact meaning of the word, and includes cases where the meaning is substantially the same (that is, a case where the effect of the present invention can be exhibited). The present invention can be modified in various ways within the scope of the gist of the present invention. Of course, some configurations of one embodiment may be added to other embodiments or replaced with some configurations of other embodiments.

For example, the main body 2 may be formed in a disk shape or an annular shape. Further, for example, the number of light sources 31 in each light source unit 3 is not limited to three, and may be one, two, or four or more. Further, for example, the wavelengths of the plurality of light sources 31 may be all in the visible light region or all may be in the near infrared region. Further, for example, instead of providing an individual light source 31 for each emission color, a light source 31 capable of selectively emitting a plurality of emission colors may be provided. Further, for example, the arrangement of the light source portion 3 is not limited to the lower side of the main body portion 2, and may be the upper side of the main body portion 2 (in this case, the through hole 21 may not be provided). Further, for example, the number of the light source units 3 is not limited to four in order to specify the width dimension and the length dimension, and may be three. Further, for example, the number of the light source units 3 may be two arranged along the width direction or the length direction in order to specify either the width dimension or the length dimension. Further, for example, the number of the light source units 3 may be one in order to determine an abnormality in the captured image. Further, for example, the power supply unit 4 may include a communication unit, receive an instruction from an external device such as an imaging device or a measuring device, and control switching of light sources of each color according to the instruction.

In the above-described embodiment, the light source unit 3 corresponds to the electronic circuit board, but the method for realizing the light source unit 3 is not limited to such a configuration. For example, two or more light source units 3 may be realized by one electronic circuit board. That is, in the present invention, each light source unit does not need to be physically separated. Each light source unit may be distinguished as a group having one or more light sources, and may be arranged at separate locations.

The present invention can be used not only for steel plates but also for other measurement objects such as buildings and machines. Further, the present invention can be provided not only in a measuring instrument but also in a measurement method and an inspection method using the measuring instrument, a measuring system including the measuring instrument and the measuring device, and the like.

1 ... Measuring instrument, 2 ... Main body, 3 ... Light source, 4 ... Power supply, 5 ... Leg, 6 ... Handle, 7 ... Flat plate, 8 ... Imaging device, 21 ... Through hole, 31 ... Light source, A ... Conveyor, B ... Ceiling

Claims (7)

A measuring instrument used to measure the dimensions of steel plates in captured images.
With the main body
Wherein provided on the main body, release the light of the wavelength belonging to the visible light region, a plurality of wavelengths wherein a heated steel sheet containing at least a light of a wavelength that at least a part belongs to the near infrared region that can emit light A measuring instrument including a light source unit that is capable and emits light having a wavelength selected from the light having a plurality of wavelengths toward an imaging device for capturing the captured image . The measuring instrument according to claim 1.
A measuring instrument having a plurality of the light source units at positions separated from each other. The measuring instrument according to claim 1.
A first light source unit and a second light source unit are provided at positions separated from each other.
The first light source unit includes a light source of light having a first wavelength and a light source of light having a second wavelength.
The second light source unit includes a light source of light having the first wavelength and a light source of light having the second wavelength.
A pair of light sources of the first wavelength belonging to the first light source unit and the second light source unit, and a pair of the second light sources belonging to the first light source unit and the second light source unit. A light source of light of the same wavelength is a measuring instrument arranged so that the distances between light sources of the same wavelength are equal. The measuring instrument according to claim 3.
The plurality of light sources of the first light source unit are arranged in a row along the first direction.
The plurality of light sources of the second light source unit are measuring instruments arranged in a row along the first direction in the same wavelength order as the plurality of light sources of the first light source unit. The measuring instrument according to claim 3 or 4.
Through holes corresponding to the respective light sources are formed in the main body.
Each light source is a measuring instrument housed in the corresponding through hole and surrounded by an inner wall of the through hole. The measuring instrument according to any one of claims 3 to 5.
Each of the light sources is a measuring instrument composed of LEDs. The measuring instrument according to any one of claims 1 to 6.
The main body is a measuring instrument made of a composite material containing carbon fibers.

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