JP3333840B2 - Lens tube test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel testing apparatus for evaluating the lens performance of a lens barrel having a plurality of lenses such as a camera.

[0002]

Conventionally, when evaluating the lens performance of the lens barrel of the camera or the like, visual manual for inversely projecting the chart on a screen using a projection tester observes visually image displayed is enlarged functional In most cases, evaluation is performed. For example, when measuring the size of a flare (bleeding of an image), the size of the flare is measured from the width of a line of the back-projected chart or the blurring. Further, when measuring the presence or absence of double reflection, the measurement was made based on whether or not the line of the back-projected chart appears to be double reflected.

[0003]

However, in the above-mentioned visual sensory evaluation, which is a conventional artificial test, individual differences occur in the evaluation results due to the physical condition, experience, etc. of the inspector, resulting in variations in quality judgment. .

Further, since the evaluation using a projection tester must be performed in a dark room, the working environment is poor and the eyes are overworked, so that the load on the inspector is very large.

The present invention solves the above-mentioned conventional problems, and provides a lens barrel test apparatus for automatically measuring the size of flare of a lens barrel and the presence or absence of double reflection without using a projection tester. It is intended to be.

[0006]

SUMMARY OF THE INVENTION A lens barrel test apparatus according to the present invention converts an optical signal from a lens barrel arranged opposite a chart composed of high density colors and low density colors (for example, black and white). An image pickup device for converting the image signal into an electric signal, a focus control unit for performing focusing control of the lens barrel based on a video signal obtained by the image pickup device, an image memory unit for storing the video signal, and the image memory unit A flare measuring means for performing arithmetic processing on the pixel data stored in the memory, and a means for outputting a result of the arithmetic processing performed by the flare measuring means. Since the size of the flare over the entire imaging range is measured by counting the number of pixels that are larger and smaller than the white threshold value, the lens barrel is charged. Use a projection tester by capturing video signals in a focused state, searching for individual pixel data, and counting the number of pixels that are greater than the black threshold and less than the white threshold. Instead, it is possible to automatically measure the size of the flare over the entire imaging range.

In addition, a measuring direction setting means for setting a measuring direction is added, and the flare measuring means searches pixel data in the image memory means in the direction set by the measuring direction setting means, and searches for pixel data before and after. It is configured to measure the flare size in the set direction by counting the number of pixels whose absolute value difference is equal to or more than a certain value, so the pixel data is searched and the absolute value difference between the previous and next pixel data is constant By counting the number of pixels equal to or greater than the value, the magnitude of the flare in the X direction can be determined independently,
The size of the flare in the Y direction can be independently measured independently.

[0008] Further, a double image detecting means for performing arithmetic processing on the pixel data stored in the image memory means is added, and the double image detecting means is provided in the image memory means in the direction set by the measuring direction setting means. Since it is configured to search for pixel data and detect the presence or absence of double reflection in the set direction based on the change state of the pixel data, the pixel data is searched in the same set direction and the change state of the pixel data is determined. Can be automatically detected independently of the presence or absence of double reflection in the X direction, and independently of the presence or absence of double reflection in the Y direction.

[0009] Further, the imaging range is divided into a plurality of areas,
By measuring / detecting for each area, the size of the flare in the entire divided area, X
It is possible to measure / detect the flare size in the direction or the Y direction and the presence or absence of double reflection.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens barrel test apparatus according to claim 1 of the present invention converts an optical signal from a lens barrel arranged opposite to a chart composed of high-density colors and low-density colors into an electric signal. An image sensor that performs focusing control of the lens barrel based on a video signal obtained by the image sensor, and an image memory that stores the video signal.
A flare measuring means for performing arithmetic processing on the pixel data stored in the image memory means; and a means for outputting a result of the arithmetic processing performed by the flare measuring means, wherein the flare measuring means searches for the pixel data in the image memory means. It is characterized in that the number of pixels having a value larger than the black threshold and smaller than the white threshold is counted to measure the size of the flare in the entire imaging range. The video signal is captured in a state where the lens barrel is focused on the chart by the focus control means, and individual pixel data is searched by the flare measurement means, and the number of pixels having a value larger than the black threshold and smaller than the white threshold Count. If there is no flare, the individual pixel data is below the black threshold or above the white threshold. Therefore, by counting the number of pixels having a value larger than the black threshold value and smaller than the white threshold value, it is possible to automatically measure the size of the flare over the entire imaging range without using a projection tester.

According to the second aspect of the present invention, there is provided a lens barrel testing apparatus.
An image sensor that converts an optical signal from a lens barrel arranged opposite to a chart composed of high-density colors and low-density colors into an electric signal, and an image sensor based on a video signal obtained by the image sensor. Focus control means for performing focus control, image memory means for storing the video signal, measurement direction setting means for setting a measurement direction, and flare measurement means for arithmetically processing pixel data stored in the image memory means. Means for outputting the result of arithmetic processing by the flare measuring means, wherein the flare measuring means searches for pixel data in the image memory means in the direction set by the measuring direction setting means, and detects absolute values of pixel data before and after. It is configured to measure the size of the flare in the set direction by counting the number of pixels where the value difference is a certain value or more. It is a symptom. The video signal is captured in a state where the lens barrel is focused on the chart by the focus control means, the pixel data is searched in the same direction set by the measurement direction setting means in the flare measurement means, and the absolute value difference between the previous and next pixel data is obtained. The number of pixels for which is equal to or greater than a certain value is counted. When there is no flare, the individual pixel data is below the black threshold or above the white threshold, and the absolute value difference between the preceding and following pixel data is from low density color to high density color or from high density color to low density color. It is almost 0 except when changing to. Therefore, by searching for pixel data in the same set direction and counting the number of pixels in which the absolute value difference between the preceding and following pixel data is equal to or greater than a certain value, the flare magnitude in the set direction can be determined without using a projection tester. And that is, X
The flare size in the Y direction can be measured independently, and the flare size in the Y direction can be measured independently.

According to a third aspect of the present invention, there is provided a lens barrel test apparatus.
An image sensor that converts an optical signal from a lens barrel arranged opposite to a chart composed of high-density colors and low-density colors into an electric signal, and an image sensor based on a video signal obtained by the image sensor. Focus control means for performing focus control, image memory means for storing the video signal, measurement direction setting means for setting a measurement direction, and double image detection for arithmetically processing pixel data stored in the image memory means Means, and means for outputting the result of arithmetic processing by the double reflection detection means, wherein the double reflection detection means searches for pixel data in the image memory means in the direction set by the measurement direction setting means. It is characterized in that it is configured to detect the presence or absence of double image in the set direction based on the change state of the pixel data. The video signal is captured in a state where the lens barrel is focused on the chart by the focus control unit, and the double image detection unit searches for pixel data in the same direction set by the measurement direction setting unit, and determines a change state of the pixel data. To detect. When there is no double image, the change pattern of the pixel data increases monotonically,
There are only three patterns: monotonous decrease and no change. Therefore, by searching for pixel data in the same set direction and examining the change state of the pixel data, without using a projection tester, the presence or absence of double reflection in the set direction, that is,
The presence or absence of double reflection in the X direction can be detected automatically, and the presence or absence of double reflection in the Y direction can be detected automatically.

According to a fourth aspect of the present invention, there is provided a lens barrel test apparatus.
In any one of the first to third aspects, the imaging range is divided into a plurality of areas, and measurement / detection is performed for each area. Not the size of the flare over the entire imaging range, nor the size of the flare over the entire range in the X direction or the entire range in the Y direction, nor the presence or absence of double image,
For each divided area, it is possible to measure / detect the flare size in the entire area, the flare size in the X direction or the Y direction, and the presence or absence of double image.

Hereinafter, a lens barrel test apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

[Embodiment 1] FIG. 1 is a block diagram showing a configuration of a lens barrel test apparatus according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a lens barrel constituted by a plurality of lenses, and 2 denotes a chart composed of low-density colors and high-density colors, that is, white and black, which are provided at positions facing the lens barrel 1. Is an image pickup device (CCD) for converting an optical signal from the lens barrel 1 into an electric signal, 4 is a connecting means for connecting the lens barrel 1 and the image pickup device 3, and 5 is a video signal based on the electric signal from the image pickup device 3. A video signal generating means, 6 a focus control means for moving the focus lens of the lens barrel 1 so as to maximize the high frequency component of the video signal and performing focusing control, 7 an image memory means for storing the video signal, and 8 a The flare measuring means 9 calculates the number of flare-producing pixels by performing arithmetic processing on the pixel data stored in the image memory means 7, and 9 denotes the number of flare-producing pixels obtained by the flare measuring means 8. Display Is a display means. The lens barrel 1 is composed of a plurality of lenses such as a zoom lens for changing the magnification of a subject and a focus lens for focusing the subject. The lens barrel 1 is detachable from the image sensor 3 via the connection means 4. When the lens barrel 1 and the same image sensor 3 are combined while exchanging a plurality of lens barrels 1, the lens barrel 1 and the image sensor 3 are connected to each other. In order to finely adjust the distance, the connection means 4 allows the image pickup device 3 to approach and separate from the lens barrel 1.

FIG. 2 is an image diagram of chart 2 used in the first embodiment. The chart 2 has white and black checkered patterns. In order for the focus lens of the lens barrel 1 to focus on the chart 2 having the white and black checkered pattern, the focus must include the boundary between white and black, that is, the high frequency component of the video signal is maximized. Next, the focus control means 6 performs focusing control.

FIG. 3 is an image diagram showing a change in a video signal depending on the presence or absence of a flare. Since the chart 2 has a white and black checkerboard pattern, the video signal includes a pixel portion in which a white value state continues, a pixel portion in which a black value state continues, and a white value to a black value or a black value to a white value. It is divided into pixel parts that change in value. FIG. 3A shows the change of the video signal without flare. At this time, the change of the video signal from white value to black value or from black value to white value is sharp because there is no flare. Rather, it is vertical. On the contrary,
FIG. 3B shows a change in the video signal when the flare is doubled.
At this time, the change from the white value to the black value and the change from the black value to the white value are inclined, and the number of pixels other than the white value is twice the number of pixels of the black value without flare. ing. That is, the pixel number ratio a: b = 1: 2. As the flare increases, the slope becomes gentler, and the ratio of the number of pixels also increases. The white threshold is set to a value slightly smaller than the white value, and the black threshold is set to a value slightly larger than the black value.

The operation of the lens barrel test apparatus according to the first embodiment configured as described above will be described below.

The image sensor 3 converts an optical signal from the lens barrel 1 into an electric signal. The connection means 4 fixes the lens barrel 1 and moves the image sensor 3 to connect the lens barrel 1 and the image sensor 3. The video signal generation means 5 generates a video signal based on the electric signal from the image sensor 3. The focus control means 6 moves the focus lens of the lens barrel 1 so as to maximize the high frequency component of the video signal output from the video signal generation means 5, and performs focus control. The image memory 7 stores the video signal output from the video signal generator 5. The flare measuring means 8 performs arithmetic processing based on the pixel data stored in the image memory means 7,
Measure the size of the flare. The display means 9 displays the result of the arithmetic processing by the flare measuring means 8.

The operation of the flare measuring means 8 will be described below with reference to the flowchart of FIG.

[0022] X address of the image data in step S1, and resets the Y address and the flare counter C _1, the process proceeds to step S2.

In step S2, 1 is added to the X address (X ++), and the flow advances to step S3.

In step S3, it is checked whether the X address has exceeded 512. If exceeded, step S4
If not, go to step S6.

In step S4, it is checked whether the Y address has exceeded 512. If exceeded, step S9
If not, go to step S5.

In step S5, the X address is reset, and 1 is added to the Y address (Y ++).
Proceed to 6.

By the above steps S2 to S5, horizontal and vertical scanning corresponding to raster scanning by the display means 9 is performed in the image memory means 7.

In step S6, the pixel data at the address (X, Y) indicated by the X and Y addresses is read from the image memory means 7, and the flow advances to step S7.

In step S7, it is checked whether the pixel data read in step S6 is larger than the set black threshold and smaller than the white threshold. If the pixel data is within this range, it means that flare has occurred. In this case, the process proceeds to step S8, and the pixel data is out of the range (the pixel data is below the black threshold or above the white threshold).
In the case of, the process proceeds to step S2.

In step S8, ₁ is set to the flare counter C1.
Is added (C ₁ ++), and the process proceeds to step S2.

The passing step S9 the value of the flare counter C ₁ on the display unit 9 ends. In the display unit 9 to display the value of the flare counter C ₁ received.

The pixel data stored in the image memory means 7 is searched in this way, and the number of pixels whose pixel data is larger than the black threshold value and smaller than the white threshold value is counted, thereby obtaining the entire image pickup range. Can measure the size of the flare automatically.

[Embodiment 2] FIG. 5 is a block diagram showing the configuration of a lens barrel test apparatus according to Embodiment 2 of the present invention. Parts corresponding to those described with reference to FIGS. , And the description thereof is omitted. 1
0 is a measuring direction setting means, and 11 is a flare measuring means.

The measuring direction setting means 10 sets a measuring direction. X is set when measuring the size of the flare in the X (horizontal) direction, and Y is set when measuring the size of the flare in the Y (vertical) direction. The flare measuring means 11 performs arithmetic processing based on the pixel data stored in the image memory means 7 to measure the size of the flare.

FIG. 6 is a flowchart showing an operation process of the flare measuring means 11 according to the second embodiment of the present invention. Hereinafter, the calculation processing of the flare measuring means 11 will be described with reference to FIG.
A description will be given based on the flowchart of FIG.

[0036] Step S10 X address of the image data in, Y address, and resets the flare counter C ₁ and variables in the current value or the like, the process proceeds to step S11.

In step S11, the measuring direction setting means 10
The direction to be measured set by the above is determined. If the measurement direction setting means 10 is set to measure the size of the flare in the X (horizontal) direction, the process proceeds to step S12, and Y
If the size of the flare in the (vertical) direction is set to be measured, the process proceeds to step S21.

First, the measurement of the magnitude of the flare in the X direction will be described.

In step S12, 1 is added to the X address (X ++), and the flow advances to step S13.

In step S13, it is checked whether the X address has exceeded 512. If exceeded, step S
The process proceeds to step S14, and if not exceeded, the process proceeds to step S16.

In step S14, it is checked whether the Y address has exceeded 512. If exceeded, step S
The process proceeds to step S30, and if not exceeded, proceeds to step S15.

In step S15, the X address is reset, 1 is added to the Y address (Y ++), and step S15 is performed.
Proceed to 16.

By the above steps S12 to S15, horizontal / vertical scanning corresponding to raster scanning by the display means 9 is performed in the image memory means 7.

In step S16, in order to update the current value, the current value is stored as the value one pixel before in the next loop, and the flow advances to step S17.

In step S17, the pixel data at the address (X, Y) indicated by the X address and the Y address is read from the image memory means 7, stored as the current value, and the flow advances to step S18.

In step S18, the absolute value difference between the current value and the value one pixel before in the horizontal direction is calculated, and the flow advances to step S19.

In step S19, it is checked whether or not the absolute value difference calculated in step S18 is larger than a predetermined value. If it is large, the change is not steep, but has a certain degree of inclination in the region where the white value changes to the black value or in the region where the black value changes to the white value, causing flare. In this case, the process proceeds to step S20. Otherwise, the absolute value difference is close to 0, the change is steep, and no flare is generated. In this case, Proceed to step S12.

[0048] by adding 1 to the flare counter C ₁ step S20 (C ₁ ++), the process proceeds to step S12.

[0049] When it is determined that the Y address exceeds 512 in step S14, the scanning for the image data of one frame has been completed, the process proceeds to step S30, terminates by passing the value of the flare counter C ₁ on the display unit 9 I do. In the display unit 9 to display the value of the flare counter C ₁ received.

Next, measurement of the magnitude of the flare in the Y (vertical) direction will be described. That is, the size of the flare in the Y direction is measured after step S21.

In step S21, 1 is added to the Y address (Y ++), and the flow advances to step S22.

In step S22, it is checked whether the Y address has exceeded 512. If exceeded, step S
The process proceeds to step S23, and if not exceeded, the process proceeds to step S25.

In step S23, it is checked whether the X address has exceeded 512. If exceeded, step S
The process proceeds to step S30, and if not exceeded, the process proceeds to step S24.

In step S24, the Y address is reset, and 1 is added to the X address (X ++).
Proceed to 25.

By the above steps S21 to S24, the image memory means 7 performs vertical / horizontal scanning corresponding to the scan in the direction perpendicular to the raster scan by the display means 9.

In step S25, to update the current value, the current value is stored as the value one pixel before in the next loop, and the flow advances to step S26.

In step S26, the pixel data at the address (X, Y) indicated by the X address and the Y address is read from the image memory means 7, stored as the current value, and the flow advances to step S27.

In step S27, the absolute value difference between the current value and the value one pixel before in the vertical direction is calculated, and the flow advances to step S28.

In step S28, it is checked whether or not the absolute value difference calculated in step S27 is larger than a predetermined value. If it is large, the change is not steep, but has a certain degree of inclination in the region where the white value changes to the black value or in the region where the black value changes to the white value, causing flare. In this case, the process proceeds to step S29. In other cases, the absolute value difference is close to 0, the change is steep, and no flare occurs. Proceed to S21.

[0060] by adding 1 to the flare counter C ₁ step S29 (C ₁ ++), the process proceeds to step S21.

[0061] When the X address has exceeded a 512 in step S23, since the scanning of the image data of one frame has been completed, the process proceeds to step S30, terminates by passing the value of the flare counter C ₁ on the display unit 9 I do. In the display unit 9 to display the value of the flare counter C ₁ received.

The pixel data stored in the image memory means 7 in this manner is stored in the X direction set by the measurement direction setting means 10.
By sequentially searching in the (horizontal) direction or the Y (vertical) direction and comparing the pixel data before and after, counting the number of pixels whose absolute value difference is equal to or more than a certain value, the horizontal direction in the same direction, that is, the horizontal direction Of the flare in the vertical direction, and in the vertical direction, the size of the flare in the vertical direction can be automatically measured.

The operation of the flare measuring means 11 is as follows.
Instead of comparing the absolute value difference between the preceding and following pixel data with a fixed value, the flare in the same direction is calculated by calculating the degree of inclination of the video signal at the point where the chart 2 changes from white to black or from black to white. May be measured automatically.

[Embodiment 3] FIG. 7 is a block diagram showing the configuration of a lens barrel test apparatus according to Embodiment 3 of the present invention, and corresponds to the portions described with reference to FIGS. 1, 2 and 5. The parts are denoted by the same reference numerals and the description is omitted. Reference numeral 12 denotes a double image detecting means for detecting double image.

The double image detecting means 12 is provided in the image memory 7
The arithmetic processing is performed on the basis of the pixel data stored in (1), and the presence or absence of double reflection is measured.

FIG. 8 is an image diagram showing a change in a video signal depending on the presence or absence of a double image.

In FIG. 8A, the change from a white value to a black value or a change from a black value to a white value of a video signal when there is no double image is steep because there is no double image. Yes,
There are only three change patterns: monotone increase, monotone decrease, and no change (including diagonal change). On the other hand, in FIG. 8B, when there is double reflection, the tendency of the change is gradual, and there is a drop or the like in the middle of the change, which is a change other than the above three patterns. The drop or the like means that the pixel value once drops and then rises, and the pixel value once rises and then falls.

FIG. 9 is a flowchart showing an operation process of the double reflection detecting means 12 according to the third embodiment of the present invention. Hereinafter, the arithmetic processing of the double reflection detection means 12 will be described with reference to the flowchart of FIG.

[0069] Step S31 X address of the image data in, and resets the Y address and double-imaging detection counter C _2, etc. of the variable, the process proceeds to step S32.

In step S32, the measuring direction setting means 10
The direction to be measured set by the above is determined. If the measurement direction setting means 10 is set to detect the presence or absence of double reflection in the X (horizontal) direction, the process proceeds to step S33, and Y
If it is set to detect the presence or absence of double image in the (vertical) direction, the process proceeds to step S42.

First, detection of presence / absence of double reflection in the X direction will be described.

In step S33, 1 is added to the X address (X ++), and the flow advances to step S34.

In step S34, it is checked whether the X address has exceeded 512. If exceeded, step S
The process proceeds to step S35, and if not exceeded, proceeds to step S37.

In step S35, it is checked whether the Y address has exceeded 512. If exceeded, step S
The process proceeds to step S51, and if not exceeded, to step S36.

In step S36, the X address is reset, 1 is added to the Y address (Y ++), and
Proceed to 37.

Through the above steps S33 to S36, horizontal and vertical scanning corresponding to the raster scanning by the display means 9 is performed in the image memory means 7.

In step S37, pixel data of two pixels before and after in the X (horizontal) direction at the same Y address are read from the image memory means 7, and the flow advances to step S38.

In step S38, it is checked whether or not the pixel value is increasing (changing from black to white) from the pixel data of the front and rear two pixels, that is, whether or not the pixel value is monotonically increasing. If it is monotonically increasing, the process proceeds to step S33; otherwise, the process proceeds to step S39.

In step S39, it is checked whether or not the pixel value is decreasing (change from white to black) from the pixel data of the front and rear two pixels, that is, whether or not the pixel value is monotonically decreasing. If it is monotonously decreasing, the process proceeds to step S33; otherwise, the process proceeds to step S40.

In step S40, it is checked whether or not the pixel value does not change (white or black) from the pixel data of the two pixels before and after. If there is no change, the process proceeds to step S33. In other cases, it is determined that double reflection has been detected, and the process proceeds to step S41. In other words, the horizontally adjacent 3
As shown in FIG. 8B, the pixel values of the two pixels
There is a drop or the like in which the pixel value once drops and then rises, or the pixel value once rises and then falls, and is detected as a double image.

[0081] 1 is added to the double-imaging detection counter C ₂ In step S41 (C ₂ ++), the process proceeds to step S33.

[0082] When it is determined that the Y address exceeds 512 in step S35, since the scanning of the image data of one frame has been completed, the process proceeds to step S51, the display unit 9 the value of double-imaging detection counter C ₂ Pass and finish. In the display unit 9 to display the value of the double-imaging detection counter C ₂ received.

Next, detection of double reflection in the Y (vertical) direction will be described. That is, after step S42, Y
Detects the presence of double image in the (vertical) direction.

In step S42, 1 is added to the Y address (Y ++), and the flow advances to step S43.

In step S43, it is checked whether the Y address has exceeded 512. If exceeded, step S
Go to step S44, otherwise go to step S46.

In step S44, it is checked whether the X address has exceeded 512. If exceeded, step S
The process proceeds to 51, and if not exceeded, proceeds to step S45.

In step S45, the Y address is reset, 1 is added to the X address (X ++), and step S45 is executed.
Proceed to 46.

By the above steps S42 to S45, the vertical / horizontal scanning corresponding to the scan in the direction perpendicular to the raster scan by the display means 9 is performed in the image memory means 7.

In step S46, pixel data of two pixels before and after in the Y (vertical) direction at the same X address are read from the image memory means 7, and the flow advances to step S47.

In step S47, it is checked whether or not the pixel value is increasing (change from black to white) from the pixel data of the two pixels before and after, that is, whether or not the pixel value is monotonically increasing. If it is monotonically increasing, the process proceeds to step S42; otherwise, the process proceeds to step S48.

In step S48, it is checked whether or not the pixel value is decreasing (change from white to black) from the pixel data of the front and rear two pixels, that is, whether or not the pixel value is monotonically decreasing. If it is monotonously decreasing, the process proceeds to step S42; otherwise, the process proceeds to step S49.

In step S49, it is checked whether or not the pixel value has not changed (white or black) from the pixel data of the front and rear two pixels. If there is no change, the process proceeds to step S42. Otherwise, it is determined that double image has been detected, and the process proceeds to step S50. That is, the vertically adjacent 3
As shown in FIG. 8B, the pixel values of the two pixels
There is a drop or the like in which the pixel value once drops and then rises, or the pixel value once rises and then falls, and is detected as a double image.

[0093] 1 is added to the double-imaging detection counter C ₂ In step S50 (C ₂ ++), the process proceeds to step S42.

[0094] When the X address has exceeded a 512 step S44, the scanning for the image data of one frame has been completed, the process proceeds to step S51, the display unit 9 the value of double-imaging detection counter C ₂ Pass and finish. In the display unit 9 to display the value of the double-imaging detection counter C ₂ received.

The pixel data stored in the image memory means 7 in this way is stored in the X direction set by the measurement direction setting means 10.
The search is sequentially performed in the (horizontal) direction or the Y (vertical) direction, and when the change pattern of the pixel data is other than the state of monotonous increase, monotonous decrease, and no change, that is, the pixel value once decreases and then increases, or If there is a drop in which the pixel value once rises and then falls, then it is determined that the image is a double image. In the same direction, that is, if it is horizontal, the presence or absence of the double image in the horizontal direction is determined by the vertical Then, the presence or absence of double image in the vertical direction can be automatically detected.

[Fourth Embodiment] Next, although not shown, a lens barrel test apparatus according to a fourth embodiment of the present invention will be described. In any of the above-described first, second, and third embodiments, the imaging range is divided into a plurality of areas, and required measurement or detection is performed for each area.

According to the fourth embodiment, it is not necessary to measure the size of the flare over the entire imaging range, nor to detect the size of the flare over the entire range in the X direction or the Y direction. In addition, instead of detecting the presence or absence of double reflection in the entire range in the X direction or the entire range in the Y direction, the image pickup range is divided into a plurality of areas, and measurement / detection is performed for each area, thereby dividing the divided area. The size of the flare in the entire area, the size of the flare in the X direction or the Y direction, and the presence / absence of double image can be measured / detected every time. Therefore, it is possible to determine finely whether the lenses are assembled in the lens barrel 1 or how the angles are combined.

In each of the above embodiments, the case where the pattern of the chart 2 is a checkered pattern has been described.
The pattern of the chart 2 is arbitrary.

Further, the size of the image memory of the image memory means 7 has been described as 512 × 512, but the size is arbitrary. It goes without saying that the larger the size, the higher the resolution, so that the measurement accuracy is improved.

[0100]

According to the lens barrel test apparatus of the present invention, pixel data captured in a focused state with respect to a chart composed of high-density colors and low-density colors is searched, and the data is obtained from the black threshold value. By counting the number of pixels that are large and smaller than the white threshold value, the size of the flare over the entire imaging range can be determined without back-projecting the chart onto the screen using a projection tester and performing manual visual sensory evaluation. Automatic, high-speed and stable measurement can be performed.

Also, the direction of measurement is set, pixel data is searched, and the number of pixels having a difference in absolute value of the preceding and succeeding pixel data equal to or more than a certain value is counted to measure the flare magnitude in the set direction. , The size of the flare in the X direction alone, and the size of the flare in the Y direction alone,
Each can be measured automatically and quickly and stably.

Also, since the pixel data is searched by setting the direction to be measured and the presence or absence of double reflection in the set direction is detected based on the change state of the pixel data.
It is possible to automatically and stably detect the presence or absence of double reflection in the direction independently and the presence or absence of double reflection in the Y direction independently.

Further, the imaging range is divided into a plurality of areas,
By measuring / detecting for each area, the size of the flare in the entire divided area, X
It is possible to measure / detect the flare size in the direction or the Y direction and the presence or absence of double reflection.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a lens barrel test apparatus according to Embodiment 1 of the present invention.

FIG. 2 is an image diagram of a chart arranged to face a lens barrel.

FIG. 3 is an image diagram showing a change in a video signal depending on the presence or absence of a flare.

FIG. 4 is a flowchart illustrating an operation process of a flare measuring unit according to the first embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a lens barrel test apparatus according to Embodiment 2 of the present invention.

FIG. 6 is a flowchart showing an operation process of a flare measuring unit according to the second embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a lens barrel test apparatus according to Embodiment 3 of the present invention.

FIG. 8 is an image diagram showing a change in a video signal depending on the presence or absence of a double image.

FIG. 9 is a flowchart showing an operation process of a double reflection detecting unit according to the third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Barrel 2 ... Chart 3 ... Image sensor 4 ... Connection means 5 ... Video signal generation means 6 ... Focus control means 7 ... Image memory means 8 ... Flare measurement means 9 ... Display means 10 …… Measurement direction setting means 11… Flare measurement means 12… Double reflection detection means C ₁ … Flare counter C ₂ … Double reflection detection counter

Claims (4)

(57) [Claims] 1. An imaging device for converting an optical signal from a lens barrel disposed opposite a chart composed of high-density colors and low-density colors into an electric signal, and a video signal obtained by the imaging device. Focus control means for performing focusing control of the lens barrel, image memory means for storing the video signal, flare measurement means for performing arithmetic processing on pixel data stored in the image memory means, and calculation by the flare measurement means. Means for outputting a processed result, wherein the flare measuring means searches pixel data in the image memory means and counts the number of pixels having a value larger than a black threshold value and smaller than a white threshold value to thereby obtain an imaging range. A lens barrel test device configured to measure the size of the entire flare. 2. An imaging device for converting an optical signal from a lens barrel disposed opposite a chart composed of high-density colors and low-density colors into an electric signal, and a video signal obtained by the imaging device. Focus control means for performing focus control of the lens barrel, image memory means for storing the video signal, measurement direction setting means for setting a measurement direction, and arithmetic processing of pixel data stored in the image memory means. Flare measuring means, and means for outputting the result of arithmetic processing by the flare measuring means, wherein the flare measuring means searches for pixel data in the image memory means in the direction set by the measurement direction setting means, It is configured to measure the size of the flare in the set direction by counting the number of pixels for which the absolute value difference of the pixel data is equal to or greater than a certain value. A lens barrel test apparatus characterized in that: 3. An imaging device for converting an optical signal from a lens barrel arranged opposite to a chart composed of high-density colors and low-density colors into an electric signal, and a video signal obtained by the imaging device. Focus control means for performing focusing control of the lens barrel, image memory means for storing the video signal, measurement direction setting means for setting a measurement direction, and arithmetic processing of pixel data stored in the image memory means. And a means for outputting the result of the arithmetic processing performed by the double reflection detecting means, wherein the double reflection detecting means is provided in the image memory means in the direction set by the measurement direction setting means. A lens barrel test apparatus configured to search for pixel data and detect the presence or absence of a double image in a set direction based on a change state of the pixel data. 4. The lens barrel test apparatus according to claim 1, wherein the imaging range is divided into a plurality of areas, and measurement / detection is performed for each area.