JP2023050908A - Inspection device and inspection method - Google Patents

Abstract

To provide an inspection device capable of preventing an increase in size.SOLUTION: An inspection device 100 is provided, comprising a lens 210, a calibration chart 400, an image capturing unit 220 for capturing an image of the calibration chart 400 through the lens 210, and an inspection unit 520 configured to inspect an image displayed by an image display system 600 according to an image capturing result of the image capturing unit 220.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an inspection apparatus and inspection method for inspecting an image displayed by an image display system.

Conventionally, there is an image display system that displays an image (more specifically, a virtual image) such as a HUD (Head Up Display). Conventionally, there are inspection systems for inspecting images displayed by such image display systems.

The inspection system disclosed in US Pat. No. 6,200,003 inspects parallax of an image displayed by an image display system.

JP 2020-166069 A

In the image display system, it is conceivable that the viewing distance will be increased with the development of technologies such as AR (Augmented Reality). Conventionally, viewing distance testing is performed by placing a master screen (also called a calibration chart) at the actual viewing distance. Therefore, when the viewing distance is increased, there is a problem that the inspection apparatus is enlarged.

The present disclosure provides an inspection device and the like capable of suppressing an increase in size.

An inspection apparatus according to an aspect of the present disclosure includes a lens, a calibration chart, an imaging unit that captures an image of the calibration chart through the lens, and an image display system based on an imaging result of the imaging unit. and an inspection unit for inspecting the image to be processed.

Also, an inspection method according to an aspect of the present disclosure captures an image of the calibration chart through a lens, and inspects an image displayed by the image display system based on the imaged result.

In addition, these general or specific aspects may be realized by non-transitory recording media such as systems, methods, integrated circuits, computer programs, or computer-readable CD-ROMs. Any combination of circuits, computer programs, and non-transitory recording media may be used.

According to the inspection device and the like according to one aspect of the present disclosure, it is possible to suppress an increase in size.

FIG. 1 is a block diagram showing the configuration of an inspection apparatus according to an embodiment. FIG. 2 is a diagram for explaining an image of a calibration chart formed by the lens according to the embodiment; FIG. 3 is a diagram showing an imaging surface of the calibration chart according to the embodiment. FIG. 4 is a diagram illustrating an example of calculation results calculated from imaging results by an imaging unit according to the embodiment; FIG. 5 is a diagram showing a specific example of the configuration of the image display system according to the embodiment. FIG. 6 is a flow chart showing a processing procedure of the inspection device according to the embodiment.

(Summary of this disclosure)
An inspection apparatus according to an aspect of the present disclosure includes a lens, a calibration chart, an imaging unit that captures an image of the calibration chart through the lens, and an image display system based on an imaging result of the imaging unit. and an inspection unit for inspecting the image to be processed.

According to this, since the imaging unit images the calibration chart through the lens, the distance from the position where the calibration chart is actually arranged to the imaging unit is larger than the distance of the calibration chart imaged by the imaging unit. The distance from the image (for example, virtual image) to the imaging unit can be made seemingly long. That is, an image of the calibration chart located at a position farther from the imaging section than the position where the calibration chart is actually arranged is projected onto the imaging section. As a result, the distance from the image of the calibration chart captured by the imaging unit to the imaging unit can be increased by appropriately changing the focal length of the lens, etc., without widening the distance between the calibration chart and the imaging unit. It can be spread easily. Therefore, it is possible to suppress an increase in the size of the inspection apparatus (that is, an excessive increase in the distance between the calibration chart and the imaging unit).

Further, for example, a calibration unit is provided for calibrating correspondence information used when the inspection unit inspects an image displayed by the image display system based on the imaging result of the imaging unit. inspecting the image displayed by the image display system based on the correspondence information calibrated by the department;

According to this, the calibration section can appropriately calibrate the correspondence information used for inspecting the image displayed by the image display system without widening the distance between the calibration chart and the imaging section.

Further, for example, the correspondence information includes information indicating a correspondence relationship between the distance from the image of the calibration chart formed by the lens to the imaging unit and parameters of the imaging unit.

According to this, the calibration unit can appropriately calibrate the information regarding the distance included in the correspondence information without widening the distance between the calibration chart and the imaging unit.

Further, for example, the image capturing unit has a focus lens, the parameter of the image capturing unit is information indicating the position of the focus lens, and the calibration unit performs The corresponding information is calibrated based on the position of the focus lens whose focus is adjusted in and the distance from the image of the calibration chart formed by the lens to the imaging unit, and the inspection unit performs the The image displayed by the image display system and the image pickup unit based on the position of the focus lens whose focus is adjusted when the image pickup unit picks up the image displayed by the image display system and the correspondence information. Check the distance to

According to this, since the inspection unit can inspect the distance between the image displayed by the image display system and the imaging unit based on the correspondence information appropriately calibrated by the calibration unit, the distance can be accurately inspected.

Further, for example, the correspondence information is information indicating a correspondence relationship between the size of the calibration chart and the number of pixels representing the calibration chart in the image generated by capturing the calibration chart by the imaging unit. including.

According to this, the calibration unit can appropriately calibrate the information about the size of the image included in the correspondence information.

Further, for example, the calibration unit determines the correspondence based on the size of the calibration chart and the number of pixels representing the calibration chart in the image generated by capturing the calibration chart by the imaging unit. After calibrating the information, the inspection unit determines the number of pixels representing the image displayed by the image display system in the image generated by the imaging unit capturing the image displayed by the image display system, and the checking the size of the image displayed by the image display system based on the correspondence information;

According to this, since the inspection unit can inspect the size of the image displayed by the image display system based on the correspondence information appropriately calibrated by the calibration unit, the size can be accurately inspected.

Further, for example, the image pickup unit picks up an image displayed by the image display system without using the lens, and the inspection unit picks up the result of the calibration chart imaged by the image pickup unit and the image pickup unit. imaging the image displayed by the image display system and the image displayed by the image display system.

This allows the inspection section to easily inspect the image displayed by the image display system without considering the influence of the lens.

Further, for example, a supporting section is provided that supports the lens and the imaging section so that the distance between the lens and the imaging section is not changed but the distance between the lens and the calibration chart can be changed.

According to this, when changing the distance from the image of the calibration chart to the imaging unit, the position of the calibration chart can be changed without changing the distance between the lens and the imaging unit. When changing the distance from the image of the calibration chart to the imaging unit, if the distance between the lens and the imaging unit is changed, the imaging unit may not be able to properly capture the entire image of the calibration chart through the lens. tends to become higher. In this case, the size of the lens needs to be increased in order to allow the imaging unit to take an image without changing the lens even if the distance from the image of the calibration chart to the imaging unit is changed. Therefore, by fixing the distance between the lens and the image capturing unit by the supporting portion, when the distance from the image of the calibration chart to the image capturing unit is changed, the image capturing unit moves from the calibration chart through the lens. It is possible to suppress the possibility that the entire image cannot be captured appropriately. Further, according to this, the imaging section can appropriately capture the image of the calibration chart through the lens without increasing the size of the lens by arranging the lens and the imaging section at appropriate positions. Also, since the lens does not have to be large, an appropriate lens can be manufactured at a lower cost.

Also, for example, the lens has a positive power.

According to this, an increase in size of the inspection apparatus can be suppressed.

Further, for example, the calibration chart is arranged at the focal position of the lens or at a position closer to the lens than the focal position of the lens.

According to this, the imaging unit can appropriately capture a virtual image of the calibration chart.

Further, for example, the lens is an achromatic lens composed of two or more lenses.

According to this, it is possible to suppress the occurrence of an error in the viewing distance due to chromatic aberration.

Also, an inspection method according to an aspect of the present disclosure captures an image of the calibration chart through a lens, and inspects an image displayed by the image display system based on the imaged result.

According to this, there exists an effect similar to the said inspection apparatus.

In addition, these comprehensive or specific aspects may be realized by a system, method, integrated circuit, computer program, or a recording medium such as a computer-readable CD-ROM. Or it may be realized by any combination of recording media.

Hereinafter, embodiments will be specifically described with reference to the drawings.

It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. Further, among the constituent elements in the following embodiments, constituent elements not described in independent claims will be described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, for example, the scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code|symbol is attached|subjected with respect to substantially the same structure, and the overlapping description may be abbreviate|omitted or simplified.

(Embodiment)
[composition]
FIG. 1 is a block diagram showing the configuration of an inspection apparatus 100 according to an embodiment.

Inspection apparatus 100 is an apparatus that inspects an image (more specifically, a virtual image) displayed by image display system 600 . Specifically, the inspection apparatus 100 displays the position of the image displayed by the image display system 600 (specifically, the distance from the image to the imaging unit 220, more specifically, the visual distance), the astigmatism Aperture, curvature of field, size, distortion, etc. are checked. The viewing distance is, for example, the distance between the user and the image when the user looks at the image displayed by the image display system 600 from a predetermined position (for example, the distance shown in FIG. 2 to be described later). is the distance L3) shown in . The astigmatic difference is, for example, the amount of deviation between the visual distance in the vertical direction of the image and the visual distance in the horizontal direction of the image. Field curvature is, for example, the amount of deviation in visual distance between the center and periphery of an image. That is, the field curvature is the deviation of the focus in an image (image), and the deviation of the focus position of the periphery of the image with respect to the focus position of the center of the image. Distortion is the way an image is visually distorted. The inspection apparatus 100 inspects the image based on the image pickup result of the image pickup unit 220 arranged at the predetermined position and the image pickup unit 220 picking up the image.

The inspection apparatus 100 includes an optical section 200 , a support section 300 , a calibration chart 400 and a processing section 500 .

The optical unit 200 is a system that captures the calibration chart 400 and the image displayed by the image display system 600 .

The optical section 200 includes a lens 210 and an imaging section 220 .

The lens 210 is a lens that controls light directed from the calibration chart 400 side toward the imaging unit 220 . Specifically, lens 210 is used to calibrate information (correspondence information 560 ) used to calculate the distance from imaging unit 220 to the image displayed by image display system 600 . The lens 210 is arranged between the calibration chart 400 and the imaging section 220 when the imaging section 220 captures the calibration chart 400 .

For example, lens 210 has positive power (ie, it collects light). In this embodiment, lens 210 is a double-sided convex lens.

Note that the lens 210 need only have positive power, and need not be a biconvex lens.

Further, for example, it is desirable that the lens 210 be an achromatic lens composed of two or more lenses, a so-called achromatic lens.

In addition, when the lens 210 is composed of a plurality of lenses, it is sufficient that the plurality of lenses are combined to have a positive power.

Also, the lens 210 may be a reflecting mirror or the like having a positive power.

The imaging unit 220 is a camera that captures an image of the calibration chart 400 (specifically, an image of the calibration chart 400 formed by the lens 210) through the lens 210. The lens 210 is arranged between the imaging unit 220 and the image displayed by the image display system 600. The imaging unit 220 captures an image displayed by the image display system 600 without going through the lens 210. That is, when the imaging unit 220 captures the calibration chart 400, the imaging unit 220 and the calibration chart 400 When the lens 210 is arranged therebetween and the imaging unit 220 images the image display system 600, the lens 210 is not arranged between the imaging unit 220 and the image display system 600. For example, the imaging unit 220 may be used for calibration. It is arranged at the same position when imaging the chart 400 and when imaging the image display system 600 .

The imaging section 220 includes a focus lens 221 , an imaging device 222 , a focus adjustment section 223 and a control section 224 .

The focus lens 221 is a lens that controls light incident on the imaging device 222 . The focus lens 221 is arranged between the lens 210 and the imaging element 222 or between the image display system 600 and the imaging element 222 .

Also, the focus lens 221 is movably supported by the outer casing of the imaging unit 220 or the like so that the focus can be adjusted by the focus adjustment unit 223 .

The imaging element 222 is an element that generates an image of the calibration chart 400 or the image display system 600 by capturing an image displayed by the calibration chart 400 or the image display system 600 . The imaging device 222 includes, for example, a plurality of pixels arranged in a matrix, and is implemented by a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), or the like.

The focus adjustment unit 223 is a mechanism that adjusts (adjusts) the focus of the focus lens 221 . The focus adjustment unit 223 is implemented by, for example, a drive mechanism such as a guide and a motor for moving the focus lens 221 . Also, the focus adjustment section 223 may include a sensor for measuring the position of the focus lens 221, for example.

The control unit 224 is a processing unit that performs various processes executed by the imaging unit 220 . The control unit 224 includes, for example, a nonvolatile memory storing a program, a volatile memory that is a temporary storage area for executing the program, an input/output port for transmitting and receiving signals, a processor that executes the program, and the like. is realized as a computer comprising

For example, the control unit 224 adjusts the focus of the focus lens 221 by controlling the focus adjustment unit 223 and causes the image sensor 222 to capture an image displayed by the calibration chart 400 or the image display system 600 . Also, for example, the control unit 224 outputs the imaging result of the imaging by the imaging device 222 to the processing unit 500 . The focus is adjusted, for example, to the position where the contrast becomes the largest (contrast peak) when the calibration chart 400 is imaged. In other words, the position of the focus lens 221 whose focus has been adjusted is the position of the focus lens 221 when the contrast of the image is maximized during imaging.

The support section 300 supports the lens 210 and the imaging section 220 (that is, the optical section 200) so that the distance between the lens 210 and the imaging section 220 is not changed and the distance between the lens 210 and the calibration chart 400 can be changed. It is a supporting member that supports. For example, the support section 300 fixes the relative positional relationship between the lens 210 and the outer casing of the imaging section 220 and supports them. Accordingly, when the viewing distance is changed, the lens 210 and the imaging section 220 can be moved as a set without changing their relative positions.

Also, for example, the support section 300 detachably and/or movably supports the lens 210 .

Also, for example, the support section 300 detachably and/or movably supports the calibration chart 400 .

The support section 300 is realized by, for example, a movable stage or the like.

A calibration chart 400 is a subject to be imaged by the imaging unit 220 . Specifically, an image of the calibration chart 400 formed by the lens 210 is captured by the imaging unit 220 .

FIG. 2 is a diagram for explaining an image (virtual image 410) of calibration chart 400 formed by lens 210 according to the embodiment. 2 is the optical axis A of the lens 210. As shown in FIG. In addition, in FIG. 2, the supporting portion 300 is schematically indicated by broken lines. The support section 300 is provided movably while fixing the relative positional relationship between the lens 210 and the imaging section 220, for example. Further, the calibration chart 400 is provided movably. When the calibration chart 400 is viewed through the lens 210 , for example, the virtual image 410 of the calibration chart 400 formed by the lens 210 is moved along with the movement of the calibration chart 400 .

The calibration chart 400, the lens 210, and the imaging section 220 are arranged side by side in this order, for example. For example, the calibration chart 400 is arranged at the focal position of the lens 210 (position of the focal point F shown in FIG. 2) or at a position closer to the lens 210 than the focal position of the lens 210 . In the example shown in FIG. 2 , the calibration chart 400 is arranged at a position closer to the lens 210 than the focal position of the lens 210 . As a result, the imaging unit 220 captures the virtual image 410 of the calibration chart 400 .

Therefore, according to such an arrangement, the imaging result of the imaging unit 220 (the image generated by the imaging unit 220) includes the actual distance between the calibration chart 400 and the imaging unit 220 (the distance between the imaging unit 220 and the lens 210). The distance L3, which is the distance between the virtual image 410 of the calibration chart 400 and the imaging unit 220 (Virtual Image Distance/VID), is reflected instead of the sum of the distance L1 and the distance L2 between the lens 210 and the calibration chart 400). image is generated. In other words, with such an arrangement, the imaging unit 220 can image the calibration chart 400 whose viewing distance is apparently the distance L3.

It should be noted that the position of the imaging unit 220 used for measuring the above-described distance is determined, for example, by the user (for example, when the image display system 600 is a HUD, the driver) to see the image displayed by the image display system 600. The position of the user's pupil (the iris diaphragm of the eye), if assumed. The imaging unit 220 is arranged, for example, so that the assumed position of the user's pupil and the position of the entrance pupil of the imaging unit 220 match. In this embodiment, the position of the imaging unit 220 is, for example, the position of the focus lens 221 .

In addition, conditions such as the size, shape, effective diameter and focal length of the lens 210 and the focus lens 221, the element size and number of pixels of the imaging device 222, the viewing angle of the imaging unit 220, the distance L1, etc. may be arbitrarily set. . For example, the focal length of the lens 210 is 1524.7 mm, the focal length of the focus lens 221 is 35 mm, and the viewing angle of the imaging unit 220 is 13.8×11.5 deg. (degree) and each condition is arbitrarily set such that the distance L1 is 147.8 mm. Also, the lens 210 may be positioned such that 30% or less of the effective diameter is used. This results in better aberrations and reduced viewing distance errors.

Distances L1 and L2 are respective distances from the principal point of lens 210 . Specifically, the distance L1 is the distance from the principal point of the lens 210 to the entrance pupil of the imaging section 220 . A distance L2 is the distance from the calibration chart 400 to the principal point of the lens 210 .

FIG. 3 is a diagram showing the imaging surface of the calibration chart 400 according to the embodiment.

The calibration chart 400 includes, for example, a dot chart section 420 and stripe chart sections 430 and 440 .

The dot chart portion 420 is a dot pattern pattern including one or more dots. The number, size, and shape of dots included in the dot chart section 420 may be set arbitrarily.

The stripe chart portions 430 and 440 are striped patterns drawn with a plurality of lines (for example, lines parallel to each other) using two or more different colors or shades of the same color. The length of the lines, the width between the lines, and the color of the lines included in the stripe chart portions 430 and 440 may be set arbitrarily.

Like these patterns, the calibration chart 400 includes circles and/or dots for converting the distance (millimeters) between dots at the position of the image displayed by the image display system 600 into pixels of the image sensor 222 . Includes dot charts such as squares. Alternatively, for example, the calibration chart 400 includes a striped pattern for measuring the positions of the images displayed by the image display system 600 from the positions of contrast peaks in the images generated by the imaging section 220 .

The pattern of the calibration chart 400 may be at least one of the dot chart portion 420, the stripe chart portion 430, and the stripe chart portion 440, or may be another pattern, or may be absent. Moreover, the shape of the calibration chart 400 may be arbitrary. A calibration chart including only the dot chart portion 420, a calibration chart including only the stripe chart portion 430, and a calibration chart including only the stripe chart portion 440 may be switched arbitrarily.

FIG. 4 is a diagram showing an example of calculation results calculated from imaging results by the imaging unit 220 according to the embodiment.

As shown in FIG. 4, for example, the size (HL and VL) of the dot chart portion 420 of the calibration chart 400 and the size (HL and VL) of the dot chart portion 420 and the are calculated.

HL is, for example, the horizontal width of the dot chart section 420 in the image generated by the imaging section 220 . For example, HL is the length (the width from the leftmost dot to the rightmost dot) of the dot chart portion 420 shown in FIG.

VL is, for example, the vertical width of the dot chart section 420 in the image generated by the imaging section 220 . For example, VL is the length of the dot chart portion 420 shown in FIG.

Hθ is the apparent size of the width of the dot chart section 420 as seen from the imaging section 220 .

Vθ is the apparent size of the vertical width of the dot chart section 420 as seen from the imaging section 220 .

For example, the distance L3 is calculated by paraxial calculation (calculation using paraxial approximation), where f is the focal length of the lens 210 and t is the distance from the focal point of the lens 210 to the calibration chart 400. (1/distance L3) = t/ ^f2 . Note that the apparent viewing distance when the lens 210 is placed between the imaging unit 220 and the subject and the actual viewing distance (that is, the viewing distance when the lens 210 is not placed between the imaging unit 220 and the subject) matches. Therefore, if the position of the imaging unit 220 is the position of the focus lens 221, the distance L3 can be calculated from, for example, the focal length of the lens 210 and the position of the focus lens 221 whose focus has been adjusted.

If such information is available, for example, the actual size of the calibration chart 400 (more specifically, the pattern of the calibration chart 400), the size of the image of the calibration chart 400 (for example, the number of pixels), and By calculating the size (for example, the number of pixels) of the image displayed by the image display system 600 in the image based on the information (correspondence information 560) indicating the distance L3 and the like, the size of the image displayed by the image display system 600 is calculated. Viewing distance, size, etc. may be checked.

Diopter (unit: diop. (diopter)) is a value expressed by the reciprocal (ie, 1/m) of the distance (eg, meters) from the eye to an image (eg, virtual image).

For example, the focal length of lens 210 may be set longer (eg, 400 mm or more). By lengthening the focal length of the lens 210, the virtual image 410 is 1 diop. The amount of movement of the lens 210 required for movement can be increased. In other words, the amount of movement of the virtual image 410 can be made smaller than the amount of movement of the lens 210 . This makes it easier to align the lens 210, that is, to align the virtual image 410, that is, to set the distance L3 to a desired value. In other words, the relative positioning accuracy between the lens 210 and the calibration chart 400 can be made rough.

For example, if the focal length of lens 210 is fmm, 1 diop. The amount of movement per hit is f ² /1000. For example, when aligning the lens 210 and the calibration chart 400, 0.01 diop. positional accuracy between the lens 210 and the calibration chart 400 is required. Therefore, for example, if f=400, 0.01 diop. Since the amount of movement per hit is 1.6 mm, if f is 400 mm or more, it is possible to easily set the distance L3 to a desired value (that is, align the lens 210 and the calibration chart 400).

Further, by lengthening the focal length of the lens 210 (that is, increasing the focal length), the refractive power (power) of the lens 210 is reduced. Therefore, it is possible to reduce the placement error sensitivity of the lens 210, and even when the placement of the lens 210 deviates from the desired position, a good imaging performance (for example, a virtual image 410 with little distortion) can be obtained.

Further, by lengthening the focal length of the lens 210, the aberration typified by field curvature around (outside) the virtual image 410 generated in the lens 210 can be reduced. On the other hand, if the focal length is too long, the distance from the imaging unit 220 to the calibration chart 400 increases, and the size of the inspection apparatus 100 increases. Therefore, the focal length should be set to, for example, 3000 mm or less.

Referring to FIG. 1 again, the processing unit 500 is a processing unit that controls each component included in the inspection apparatus 100 and acquires and processes imaging results of the imaging unit 220 . The processing unit 500 includes, for example, a nonvolatile memory storing a program, a volatile memory that is a temporary storage area for executing the program, an input/output port for transmitting and receiving signals, a processor that executes the program, and the like. is realized as a computer comprising

The processing unit 500 includes a communication unit 510 , an inspection unit 520 , a calibration unit 530 , an input/output unit 540 and a storage unit 550 .

The communication unit 510 is a communication interface for acquiring the imaging result of the imaging unit 220 (specifically, information indicating the imaging result) by communicating with the imaging unit 220 . Note that the communication unit 510 may be connected to the imaging unit 220 so as to be capable of wired communication, or may be connected to be capable of wireless communication. For example, when the communication unit 510 is connected to the imaging unit 220 so as to be capable of wired communication, the communication unit 510 is realized by an adapter or the like to which a communication line is connected. Further, for example, when the communication unit 510 is connected to the imaging unit 220 so as to be able to communicate wirelessly, the communication unit 510 is implemented by an antenna, a wireless communication circuit, and the like.

The inspection unit 520 is a processing unit that inspects the image displayed by the image display system 600 based on the imaging result of the imaging unit 220 . Specifically, the inspection unit 520 inspects the image captured by the imaging unit 220 and displayed by the image display system 600 based on the imaging result of the calibration chart 400 by the imaging unit 220 . That is, the inspection unit 520 compares the imaging result of the calibration chart 400 by the imaging unit 220 (first imaging result) with the imaging result of the image displayed by the image display system 600 by the imaging unit 220 (second imaging result). Based on this, the image displayed by the image display system 600 is examined.

As described above, the imaging unit 220 captures the calibration chart 400 via the lens 210 and captures an image displayed by the image display system 600 without the lens 210 .

Note that the inspection apparatus 100 may include a driving section configured by guides, motors, and the like for moving the calibration chart 400, the image display system 600, the lens 210, the imaging section 220, the support section 300, and the like. For example, when executing processing for calibrating the correspondence information 560, the processing unit 500 (for example, the calibration unit 530) controls the driving unit so that the calibration chart 400 faces the imaging unit 220. In addition, the lens 210 may be arranged between the calibration chart 400 and the imaging section 220 . Further, for example, when executing processing for inspecting an image displayed by the image display system 600, the processing unit 500 (for example, the inspection unit 520) controls the driving unit so that the image display system 600 The image display system 600 may be arranged such that the image to be displayed is projected onto the imaging unit 220 , and the lens 210 may be moved so as not to be positioned between the image display system 600 and the imaging unit 220 .

The calibration unit 530 is a processing unit that calibrates the correspondence information 560 used when the inspection unit 520 inspects the image displayed by the image display system 600 based on the imaging result of the imaging unit 220 . Specifically, the calibration unit 530 calibrates the correspondence information 560 used when the inspection unit 520 inspects the image displayed by the image display system 600 based on the imaging result of the calibration chart 400 by the imaging unit 220 . . The correspondence information 560 is stored in advance in the storage unit 550, for example. The calibration unit 530 calibrates the correspondence information 560 stored in the storage unit 550 .

The inspection unit 520 inspects the image displayed by the image display system 600 based on the correspondence information 560 calibrated by the calibration unit 530, for example.

The correspondence information 560 is information used when the inspection unit 520 inspects the image displayed by the image display system 600 . The correspondence information 560 includes, for example, information obtained by the imaging unit 220 imaging the calibration chart 400 . For example, the correspondence information 560 includes information indicating the size of an image (for example, size in the image) obtained by imaging the calibration chart 400 by the imaging unit 220, information indicating the focus position of the focus lens 221, and viewing distance. This information includes information indicating, etc., and these information are included in association with each other.

The correspondence information 560 is, for example, information indicating the correspondence relationship between the distance from the image of the calibration chart 400 formed by the lens 210 to the imaging unit 220 (for example, the distance L3 shown in FIG. 2) and the parameters of the imaging unit 220. including.

The parameter of the imaging unit 220 is, for example, information indicating the position (focus position) of the focus lens 221 . That is, for example, the correspondence information 560 includes information indicating the correspondence relationship between the focus position and the viewing distance.

For example, the calibration unit 530 determines the position of the focus lens 221 whose focus is adjusted when the imaging unit 220 captures the image of the calibration chart 400, and the distance from the image of the calibration chart 400 formed by the lens 210 to the imaging unit 220. Correspondence information 560 is calibrated based on the distance. As described above, the focus is adjusted to the position where the contrast is maximized when the calibration chart 400 is imaged, for example. For example, the control unit 224 adjusts the position of the focus lens 221 so that the contrast of the stripe chart portion 430 in the image is maximized.

The imaging unit 220 adjusts the focus of the focus lens 221 when imaging the calibration chart 400, for example. For example, the calibration unit 530 acquires information indicating the focus position of the focus lens 221 from the imaging unit 220 via the communication unit 510 . Further, the calibration unit 530 acquires information indicating the distance L3 from the user via the input/output unit 540 connected to a user interface such as a keyboard (not shown). Based on these pieces of information, the calibration unit 530 calibrates the correspondence relationship between the information indicating the focus position and the information indicating the distance L3 included in the correspondence information 560 .

Note that the inspection apparatus 100 may include a distance sensor for measuring the distance L3. In this case, for example, the calibration unit 530 may calculate the distance L3 based on the measurement result of the distance measuring sensor and information indicating performance such as the focal length of the lens 210 .

Based on the position of the focus lens 221 whose focus is adjusted when the imaging unit 220 captures an image displayed by the image display system 600, and the correspondence information 560, the inspection unit 520 performs the image display by the image display system 600. The distance between the displayed image and the imaging unit 220 is inspected.

For example, when the imaging unit 220 captures an image in which a stripe chart of vertical lines similar to the calibration chart 400 is displayed by the image display system 600, the inspection unit 520 determines the position and position of the focus lens 221 whose focus has been adjusted. is displayed by the image display system 600 based on the position of the focus lens 221 whose focus has been adjusted and the correspondence information 560 when capturing an image in which a stripe chart of horizontal lines similar to the calibration chart 400 is displayed. to inspect the image. For example, inspection unit 520 inspects astigmatism and field curvature of the image displayed by image display system 600 based on this information. For example, the correspondence information 560 includes the position of the midpoint between the focus peaks of the vertical lines and the horizontal lines of the stripe charts 430 and 440, the viewing distance from the imaging unit 220, and the focus positions of the stripe charts 430 and 440 (the focus is adjusted). position of the focus lens 221). For example, the calibration unit 530 positions the center of the focus peak of each of the vertical lines and the horizontal lines of the stripe chart portions 430 and 440 included in the correspondence information 560 based on the imaging result of the stripe chart portions 430 and 440 by the imaging unit 220. and the imaging unit 220 and the focal positions of the stripe chart units 430 and 440, respectively. The inspection unit 520 determines, for example, the intermediate positions of the focus peaks of the vertical lines and the horizontal lines of the stripe chart arranged near the center of the image displayed by the image display system 600, and the corresponding viewing distances from the imaging unit 220. an image displayed by the image display system 600 based on the deviation amount of the focus position between the vertical line and the horizontal line of the stripe chart arranged around the image displayed by the image display system 600 and the correspondence information 560. and the imaging unit 220 (for example, meters or diops) is measured as the amount of curvature of field to inspect the curvature of field of the image displayed by the image display system 600 .

Alternatively, the inspection unit 520 may detect, for example, the position of the focus lens 221 whose focus is adjusted when the image capturing unit 220 captures an image in which a dot chart similar to the calibration chart 400 is displayed by the image display system 600, Based on the correspondence information 560, the image displayed by the image display system 600 is checked for distortion. For example, the correspondence information 560 includes information indicating the correspondence relationship between the position of each point in the dot chart section 420 and the focus position (the position of the focus lens 221 when the focus is adjusted). The calibration unit 530 calibrates information indicating the correspondence between the position of each point in the dot chart portion 420 and the focus position, which is included in the correspondence information 560, based on the imaging result of the dot chart portion 420 by the imaging unit 220, for example. do. The inspection unit 520 inspects the distortion of the image displayed by the image display system 600, for example, based on the position of each point in the dot chart included in the image displayed by the image display system 600 and the correspondence information 560. .

The inspection apparatus 100 may include a stereo camera or the like in order to measure the distance L3, and measure the distance using the stereo camera or the like. For example, the calibration unit 530 may calculate the distance L3 based on parallax information measured by a stereo camera.

Also, for example, the correspondence information 560 includes the size (actual size) of the calibration chart 400 and the number of pixels (ie, , size in the image). In the above example, the size of the calibration chart 400 is, for example, the size (area and/or length and width) of a rectangle formed by connecting the dots positioned on the outermost periphery of the dot chart section 420 with lines. be. In this way, the lens 210 includes, for example, information for associating the size of the image displayed by the image display system 600 with the number of pixels in the image sensor 222 (that is, the number of pixels in the image generated by the image sensor 222). is used to calibrate the correspondence information 560 including

The calibration unit 530 calibrates the correspondence information 560 based on the size of the calibration chart 400 and the number of pixels representing the calibration chart 400 in the image generated by the imaging unit 220 capturing the calibration chart 400 . . For example, the calibration unit 530 acquires an image generated by capturing the calibration chart 400 via the communication unit 510 from the imaging unit 220 . Further, the calibration unit 530 acquires information indicating the size of the calibration chart 400 from the user via the input/output unit 540 connected to a user interface such as a keyboard (not shown). Based on this information, the calibration unit 530 calibrates the correspondence between the size (the number of pixels) in the image and the actual size, which is included in the correspondence information 560 .

For example, the inspection unit 520 obtains the number of pixels representing the image displayed by the image display system 600 in the image generated by the imaging unit 220 capturing the image displayed by the image display system 600, and the correspondence information 560. to check the size of the image displayed by the image display system 600 based on . That is, the inspection unit 520 calculates the size (the number of pixels) of an image generated by the imaging unit 220 capturing an image displayed by the image display system 600, for example, based on the calculation result and the correspondence information 560. , the size, distortion of the image, curvature of field, etc. when the image is actually visually recognized by the user are inspected.

Note that, if the correspondence information 560 is not stored in the storage unit 550 , the calibration unit 530 may generate the correspondence information 560 based on the imaging result of the calibration chart 400 by the imaging unit 220 . In this case, for example, the inspection unit 520 inspects the image displayed by the image display system 600 based on the correspondence information 560 generated by the calibration unit 530 .

Also, the inspection unit 520 may inspect the image based on the imaging result of the image displayed by the image display system 600 by an imaging unit different from the imaging unit 220 using the correspondence information 560 .

The input/output unit 540 receives an input from a user interface such as a touch panel or a keyboard that receives user input, or receives correspondence information 560 and/or an inspection result of an image displayed by the image display system 600 by the inspection unit 520. It is an interface that outputs (more specifically, information indicating test results) to a device such as a display. The input/output unit 540 is implemented by, for example, an adapter or the like connected to devices such as a keyboard and a display. The input/output unit 540 may have a display such as a keyboard.

The storage unit 550 is a storage device that stores correspondence information 560 and control programs executed by the inspection unit 520 and the calibration unit 530 . The storage unit 550 is implemented by, for example, a storage device such as a flash memory or an HDD (Hard Disk Drive).

The image display system 600 is a system for displaying images. In this embodiment, image display system 600 is a HUD that displays a virtual image.

FIG. 5 is a diagram showing a specific example of the configuration of the image display system 600 according to the embodiment.

The image display system 600 shown in FIG. 5 displays a virtual image based on the image by projecting the image using an image display optical system 620 . The image display system 600 includes an image display section 610 , an image display optical system 620 , a reflector 630 , a control section 640 and a housing 650 .

Image display unit 610 is a display device that outputs light for displaying an image for forming a virtual image. The image display unit 610 includes a display device such as a liquid crystal display or an organic EL (Electro Luminescence) display.

The image display optical system 620 is an optical system for enlarging the light (image) emitted from the image display section 610 . The image display optical system 620 is composed of, for example, one or more mirrors.

The reflecting mirror 630 is an optical element that emits light emitted from the image display optical system 620 toward the imaging section 220 . Reflector 630 is, for example, translucent and functions as a combiner.

The control unit 640 is a processing unit that controls the image display unit 610 . The control unit 640 includes, for example, a nonvolatile memory storing a program, a volatile memory that is a temporary storage area for executing the program, an input/output port for transmitting and receiving signals, a processor that executes the program, and the like. is realized as a computer comprising

The housing 650 is a housing that accommodates the image display section 610 , the image display optical system 620 and the control section 640 . The housing 650 is made of, for example, synthetic resin and has a box shape.

Note that the image display system 600 is, for example, a HUD as described above, but may be an HMD (Head Mount Display), a viewfinder, or the like. Also, the image displayed by the image display system 600 is, for example, a virtual image, but may be a real image.

[Processing procedure]
FIG. 6 is a flow chart showing the processing procedure of the inspection apparatus 100 according to the embodiment.

First, the imaging unit 220 images the calibration chart 400 through the lens 210 (S101).

Next, the calibration unit 530 acquires the imaging result (first imaging result) of the calibration chart 400 from the imaging unit 220 via the communication unit 510, and calibrates the correspondence information 560 based on the acquired imaging result (S102). ).

For example, the inspection apparatus 100 changes the position of the calibration chart 400 and repeats steps S101 and S102. For example, the inspection apparatus 100 changes the position of the calibration chart 400 and adjusts the focus of the focus lens 221 to repeatedly take images. Also, for example, the inspection apparatus 100 acquires information indicating the distance from the image of the calibration chart 400 formed by the lens 210 to the imaging unit 220 via the input/output unit 540 . The inspection apparatus 100 obtains the first imaging result (for example, information indicating the position of the focus lens 221) at each position of the calibration chart 400, and the image of the calibration chart 400 formed by the lens 210 to the imaging unit 220. The correspondence information 560 is calibrated (updated) based on the information indicating the distance of .

Alternatively, the inspection apparatus 100, for example, changes the size of the calibration chart 400 (for example, the area of the circumscribing rectangle of the dot chart portion 420 of the calibration chart 400), and repeats steps S101 and S102. For example, the inspection apparatus 100 repeatedly images the calibration chart 400 while changing the size, and calculates the number of pixels of the calibration chart 400 included in the image. Also, for example, the inspection apparatus 100 acquires information indicating the size (actual size) of the calibration chart 400 via the input/output unit 540 . The inspection apparatus 100 performs the measurement based on the first imaging result (for example, information indicating the number of pixels of the calibration chart 400 in the image) for each size of the calibration chart 400 and the information indicating the size of the calibration chart 400. , to calibrate the correspondence information 560 .

Next, the imaging unit 220 captures an image displayed by the image display system 600 without going through the lens 210 (S103). The positions of the calibration chart 400, the lens 210, and/or the image display system 600 may be moved by controlling a drive mechanism that movably supports them by the processing section 500 or the like.

Next, the inspection unit 520 acquires the imaging result (second imaging result) of the image displayed by the image display system 600 from the imaging unit 220 via the communication unit 510, and based on the acquired imaging result and the correspondence information 560 to inspect the image displayed by the image display system 600 (S104).

Next, the input/output unit 540 outputs the inspection result of the inspection unit 520 (S105). The input/output unit 540 may output the inspection result as an image to a display device such as a display, for example. Alternatively, the input/output unit 540 may output the inspection result to an external memory such as a USB (Universal Serial Bus) memory.

Note that the inspection unit 520 may store the inspection result in the storage unit 550 .

Further, the processing for calibration (S101 and S102) does not necessarily have to be performed every time before the processing for inspection (S103 to S105). For example, if steps S103 to S105 are repeated many times a day, steps S101 to S102 may be performed once a day at most. For example, steps S101 and S102 may be executed when the object to be inspected by the inspection apparatus 100 (for example, the image display system 600) is changed.

[Effects, etc.]
As described above, the inspection apparatus 100 according to the embodiment includes the lens 210, the calibration chart 400, the imaging unit 220 that captures an image of the calibration chart 400 through the lens 210, and the imaging result of the imaging unit 220. and an inspection unit 520 for inspecting the image displayed by the image display system 600 based on the image display system 600 .

Conventionally, for example, inspection of the viewing distance of the image display system 600 is performed with the calibration chart 400 placed at the actual viewing distance. Therefore, for example, when trying to inspect the image display system 600 with a viewing distance of 10 m, a space and equipment that can separate the calibration chart 400 from the imaging unit 220 by 10 m are required. Therefore, the equipment becomes large-sized. Therefore, according to the inspection apparatus 100, since the imaging unit 220 images the calibration chart 400 via the lens 210, the distance from the position where the calibration chart 400 is actually arranged to the imaging unit 220 is longer than the imaging unit 220. The distance from the image (for example, virtual image) of the calibration chart 400 imaged by the unit 220 to the imaging unit 220 can be made a seemingly long distance. That is, an image of the calibration chart 400 located at a position farther from the imaging section 220 than the position where the calibration chart 400 is actually arranged is projected onto the imaging section 220 . As a result, even if the distance between the calibration chart 400 and the imaging unit 220 is not widened, the focal length of the lens 210 or the like is appropriately changed, so that the image of the calibration chart 400 captured by the imaging unit 220 can be captured. The distance to the part 220 can be easily increased. Therefore, it is possible to suppress an increase in the size of the inspection apparatus 100 (that is, an excessive increase in the distance between the calibration chart 400 and the imaging unit 220).

Further, for example, a calibration unit 530 is provided that calibrates the correspondence information 560 used when the inspection unit 520 inspects the image displayed by the image display system 600 based on the imaging result of the imaging unit 220 . In this case, for example, the inspection unit 520 inspects the image displayed by the image display system 600 based on the correspondence information 560 calibrated by the calibration unit 530 .

According to this, the calibration unit 530 can appropriately calibrate the correspondence information 560 used for inspecting the image displayed by the image display system 600 without widening the distance between the calibration chart 400 and the imaging unit 220. can do.

Further, for example, the correspondence information 560 includes information (first information) indicating the correspondence relationship between the distance from the image of the calibration chart 400 formed by the lens 210 to the imaging unit 220 and the parameters of the imaging unit 220 .

According to this, the calibration unit 530 can appropriately calibrate the distance information included in the correspondence information 560 without widening the distance between the calibration chart 400 and the imaging unit 220 .

Also, for example, the imaging unit 220 has a focus lens 221 . In this case, for example, the parameter of the imaging unit 220 is information indicating the position of the focus lens 221 . Further, in this case, for example, the calibration unit 530 calculates a The correspondence information 560 is calibrated based on the distance to the imaging unit 220 . Also, in this case, for example, the inspection unit 520, based on the position of the focus lens 221 whose focus is adjusted when the imaging unit 220 captures an image displayed by the image display system 600, and the correspondence information 560, The distance between the image displayed by the image display system 600 and the imaging unit 220 is inspected.

According to this, since the inspection unit 520 can inspect the distance between the image displayed by the image display system 600 and the imaging unit 220 based on the correspondence information 560 appropriately calibrated by the calibration unit 530, the distance can be accurately determined. can be inspected well.

Further, for example, the correspondence information 560 is information indicating the correspondence relationship between the size of the calibration chart 400 and the number of pixels representing the calibration chart 400 in the image generated by capturing the calibration chart 400 by the imaging unit 220. (second information).

According to this, the calibration unit 530 can appropriately calibrate the information about the size of the image included in the correspondence information 560 .

Further, for example, the calibration unit 530 calculates the correspondence information based on the size of the calibration chart 400 and the number of pixels indicating the calibration chart 400 in the image generated by capturing the calibration chart 400 by the imaging unit 220. 560 is calibrated. In this case, for example, the inspection unit 520 determines the number of pixels representing the image displayed by the image display system 600 in the image generated by the imaging unit 220 capturing the image displayed by the image display system 600, and Based on information 560, the size of the image displayed by image display system 600 is checked.

According to this, since the inspection unit 520 can inspect the size of the image displayed by the image display system 600 based on the correspondence information 560 appropriately calibrated by the calibration unit 530, the size can be accurately inspected.

Note that, for example, the inspection unit 520 determines the number of pixels indicating the image displayed by the image display system 600 (pixel position ) and the correspondence information 560, the distortion of the image displayed by the image display system 600 may be checked.

According to this, the inspection unit 520 can accurately inspect the distortion of the image displayed by the image display system 600 .

Alternatively, for example, the inspection unit 520 may detect a plurality of locations of the image displayed by the image display system 600 (for example, an image generated by the imaging unit 220 capturing an image displayed by the image display system 600). The curvature of field of the image displayed by the image display system 600 may be inspected based on the deviation amount of each focus position (at the center of the image and its periphery when the image was captured) and the correspondence information 560 .

According to this, the inspection unit 520 can accurately inspect the curvature of field of the image displayed by the image display system 600 .

Also, for example, the imaging unit 220 captures an image displayed by the image display system 600 without using the lens 210 . In addition, for example, the inspection unit 520 displays an image displayed by the image display system 600 based on the imaging result of the calibration chart 400 by the imaging unit 220 and the imaging result of the image displayed by the image display system 600 by the imaging unit 220 . to inspect the image.

This allows the inspection unit 520 to easily inspect the image displayed by the image display system 600 without considering the influence of the lens 210 .

In addition, for example, a support section 300 is provided to support the lens 210 and the imaging section 220 without changing the distance between the lens 210 and the imaging section 220 and allowing the distance between the lens 210 and the calibration chart 400 to be changed.

According to this, when changing the distance from the image of the calibration chart 400 to the imaging unit 220 , the position of the calibration chart 400 can be changed without changing the distance between the lens 210 and the imaging unit 220 . When changing the distance from the image of the calibration chart 400 to the imaging unit 220 , if the distance between the lens 210 and the imaging unit 220 is changed, the imaging unit 220 captures the entire image of the calibration chart 400 through the lens 210 . The possibility of not being able to take an image properly is likely to increase. For example, when changing the distance from the image of the calibration chart 400 to the imaging unit 220, if the position of the calibration chart 400 is fixed, the position of the imaging unit 220 is fixed, and the lens 210 is moved, the light beam (Light traveling from the calibration chart 400 to the lens 210 ) passes outside the lens 210 . In this case, the size of the lens 210 needs to be increased in order for the imaging unit 220 to take an image without changing the lens 210 even if the distance from the image of the calibration chart 400 to the imaging unit 220 is changed. As a result, the size of the inspection device 100 increases, and the manufacturing cost of the inspection device 100 increases. Therefore, by fixing the distance between the lens 210 and the imaging unit 220 by the supporting unit 300, when the distance from the image of the calibration chart 400 to the imaging unit 220 is changed, the imaging unit 220 can be moved to the lens. 210, it is possible to prevent the possibility that the entire image of the calibration chart 400 cannot be properly captured. Further, according to this, the image pickup unit 220 can appropriately capture the image of the calibration chart 400 through the lens 210 without increasing the size of the lens 210 by arranging the lens 210 and the image pickup unit 220 at appropriate positions. can be imaged. Moreover, since the lens 210 does not need to be enlarged, an appropriate lens 210 can be manufactured at a lower cost.

Also, for example, lens 210 has a positive power.

According to this, the enlargement of the inspection apparatus 100 can be suppressed.

Also, for example, the calibration chart 400 is arranged at the focal position of the lens 210 or at a position closer to the lens 210 than the focal position of the lens 210 .

According to this, the imaging unit 220 can appropriately capture a virtual image of the calibration chart 400 . According to the inspection apparatus 100 having such a configuration, for example, by arranging the calibration chart 400 below the focal length of the lens 210 (that is, the focal length of the lens 210 or a position closer to the lens 210 than the focal length), Calibration from several cm (thickness of lens 210) to infinity is possible. For example, when the calibration chart 400 is placed at the focal point F of the lens 210, the viewing distance becomes infinity.

Also, for example, the lens 210 is an achromatic lens composed of two or more lenses.

According to this, it is possible to suppress the occurrence of an error in the viewing distance due to chromatic aberration.

Also, in the inspection method according to one aspect of the present disclosure, the calibration chart 400 is imaged through the lens 210 (S101), and the image displayed by the image display system 600 is inspected based on the imaged result (S104). .

According to this, the same effect as that of the inspection apparatus 100 can be obtained.

In addition, these general or specific aspects may be realized by non-transitory recording media such as systems, methods, integrated circuits, computer programs, or computer-readable CD-ROMs. Any combination of circuits, computer programs, and non-transitory recording media may be used.

(Other embodiments)
Although the inspection apparatus and the like according to one or more aspects have been described based on the above embodiments, the present disclosure is not limited to the above embodiments. As long as they do not deviate from the gist of the present disclosure, various modifications conceived by those skilled in the art may also be included within the scope of the present disclosure.

For example, the present disclosure may be implemented as an inspection system that includes inspection apparatus 100 and image display system 600 .

In addition, for example, the inspection apparatus 100 and the control unit 640 may be communicably connected. That is, the inspection apparatus 100 may be configured to be able to control the image display section 610 .

Also, for example, the correspondence information 560 may be information including a plurality of the above-described information such as the first information and the second information. According to this, the inspection unit 520 can perform a plurality of inspections such as viewing distance and size of the image displayed by the image display system 600 based on the correspondence information 560 .

Also, for example, in the above embodiments, the processing unit 500 is realized as a single device, but may be realized by a plurality of devices. When the processing unit 500 is implemented by a plurality of devices, the components included in the processing unit 500 described in the above embodiment may be distributed to the plurality of devices in any way.

Also, the processing unit 500 and the control units 224 and 640 may be implemented by a single processor or the like.

Further, in the above-described embodiments, the processing executed by a specific processing unit may be executed by another processing unit. In addition, the order of multiple processes may be changed, and multiple processes may be executed in parallel.

Also, for example, in the above-described embodiment, each component of the processing unit 500 may be configured with dedicated hardware, or may be realized by executing a software program suitable for each component. Each component may be implemented by a program execution unit such as a CPU (Central Processing Unit) or processor reading and executing a software program recorded in a recording medium such as a hard disk or semiconductor memory. Here, the program that implements each device and the like of the above embodiments causes a computer to execute each step of the flowchart shown in FIG. 2, for example.

Note that the following cases are also included in the present disclosure.

(1) The at least one device is specifically a computer system composed of a microprocessor, a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk unit, a display unit, a keyboard, a mouse, etc. be. A computer program is stored in the RAM or hard disk unit. At least one of the above devices achieves its functions by a microprocessor operating according to a computer program. Here, the computer program is constructed by combining a plurality of instruction codes indicating instructions to the computer in order to achieve a predetermined function.

(2) A part or all of the components constituting the at least one device may be composed of one system LSI (Large Scale Integration). A system LSI is an ultra-multifunctional LSI manufactured by integrating multiple components on a single chip. Specifically, it is a computer system that includes a microprocessor, ROM, RAM, etc. . A computer program is stored in the RAM. The system LSI achieves its functions by the microprocessor operating according to the computer program.

(3) A part or all of the components constituting at least one of the above devices may be composed of an IC card or a single module that can be attached to and detached from the device. An IC card or module is a computer system composed of a microprocessor, ROM, RAM and the like. The IC card or module may include the super multifunctional LSI. The IC card or module achieves its function by the microprocessor operating according to the computer program. This IC card or this module may have tamper resistance.

(4) The present disclosure may be the method shown above. Moreover, it may be a computer program for realizing these methods by a computer, or it may be a digital signal composed of a computer program.

In addition, the present disclosure is a computer-readable non-temporary recording medium for computer programs or digital signals, such as flexible discs, hard disks, CD (Compact Disc)-ROM, DVD, DVD-ROM, DVD-RAM, BD ( Blu-ray (registered trademark) Disc), semiconductor memory, or the like. Alternatively, it may be a digital signal recorded on these recording media.

Further, the present disclosure may transmit computer programs or digital signals via telecommunication lines, wireless or wired communication lines, networks typified by the Internet, data broadcasting, and the like.

Also, the program or digital signal may be recorded on a recording medium and transferred, or the program or digital signal may be transferred via a network or the like to be implemented by another independent computer system.

INDUSTRIAL APPLICABILITY The present disclosure is applicable, for example, to an apparatus for inspecting a virtual image displayed by a HUD.

REFERENCE SIGNS LIST 100 inspection device 200 optical section 210 lens 220 imaging section 221 focus lens 222 imaging element 223 focus adjustment section 224, 640 control section 300 support section 400 calibration chart 410 virtual image 420 dot chart section 430, 440 stripe chart section 500 processing section 510 communication Section 520 Inspection Section 530 Calibration Section 540 Input/Output Section 550 Storage Section 560 Corresponding Information 600 Image Display System 610 Image Display Section 620 Image Display Optical System 630 Reflector 650 Housing A Optical Axis F Focus L1, L2, L3 Distance

Claims (12)

a lens;
a calibration chart;
an imaging unit that captures an image of the calibration chart through the lens;
An inspection device, comprising: an inspection unit that inspects an image displayed by an image display system based on an imaging result of the imaging unit. a calibration unit that calibrates correspondence information used when the inspection unit inspects an image displayed by the image display system based on the imaging result of the imaging unit;
The inspection apparatus according to claim 1, wherein the inspection section inspects the image displayed by the image display system based on the correspondence information calibrated by the calibration section. 3. The inspection apparatus according to claim 2, wherein the correspondence information includes information indicating a correspondence relationship between a distance from the image of the calibration chart formed by the lens to the imaging unit and a parameter of the imaging unit. The imaging unit has a focus lens,
The parameter of the imaging unit is information indicating the position of the focus lens,
The calibration unit determines the position of the focus lens whose focus is adjusted when the imaging unit captures the calibration chart, and the distance from the image of the calibration chart formed by the lens to the imaging unit. calibrate the correspondence information based on
The inspection unit is configured to display the image displayed by the image display system based on the position of the focus lens whose focus is adjusted when the imaging unit captures the image displayed by the image display system, and the correspondence information. The inspection device according to claim 3, which inspects the distance between the image and the imaging unit. The correspondence information includes information indicating a correspondence relationship between the size of the calibration chart and the number of pixels representing the calibration chart in an image generated by capturing the calibration chart by the imaging unit. The inspection device according to any one of 2 to 4. The calibration unit calibrates the correspondence information based on the size of the calibration chart and the number of pixels representing the calibration chart in an image generated by capturing the calibration chart by the imaging unit. ,
Based on the number of pixels representing the image displayed by the image display system in the image generated by the imaging unit capturing the image displayed by the image display system, and the correspondence information. 6. The inspection apparatus of claim 5, wherein the size of the image displayed by the image display system is inspected. The imaging unit captures an image displayed by the image display system without passing through the lens,
The inspection unit inspects the image displayed by the image display system based on the imaging result of the calibration chart by the imaging unit and the imaging result of the image displayed by the image display system by the imaging unit. The inspection device according to any one of claims 1 to 6. A supporting unit for supporting the lens and the imaging unit without changing the distance between the lens and the imaging unit and allowing the distance between the lens and the calibration chart to be changed. The inspection device according to any one of items 1 and 2. The inspection apparatus according to any one of claims 1 to 8, wherein the lens has positive power. The inspection apparatus according to any one of claims 1 to 9, wherein the calibration chart is arranged at the focal position of the lens or at a position closer to the lens than the focal position of the lens. The inspection apparatus according to any one of claims 1 to 10, wherein the lens is an achromatic lens composed of two or more lenses. Take an image of the calibration chart through the lens,
An inspection method for inspecting an image displayed by an image display system based on imaging results.

Images