JP2016109558A - Inspection device and illuminance monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information notification device which notify an operator, etc., of abnormality in illuminance.SOLUTION: An inspection device comprises an image-capturing device 10 for capturing the image of an object 100 to be inspected, an arithmetic processing device 20 for inspecting the object 100 to be inspected corresponding to an inspection item on the basis of the per-pixel captured image information obtained from the captured image information of the image-capturing device 10, and a notification device 40 for notifying information on the basis of the command of the arithmetic processing device 20, the arithmetic processing device 20 calculating, when at least two achromatic areas differing in illuminance value exist in the captured image of the image-capturing device 10, an illuminance difference between a first illuminance value in a first achromatic area and a second illuminance value in a second achromatic area, and also calculating a reference illuminance difference between a first reference illuminance value in the first achromatic area and a second reference illuminance value in the second achromatic area, the arithmetic processing device 20 making notification information that there is abnormality in the ambient illuminance of the object 100 to be inspected outputted from the notification device 40 when the illuminance difference is smaller than the reference illuminance difference.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inspection apparatus and an illuminance monitoring apparatus using a captured image.

  2. Description of the Related Art Conventionally, an inspection apparatus is known that uses a captured image of an inspection object by an imaging apparatus when inspecting the inspection object. The inspection is performed under a predetermined value or an illuminance within a predetermined range. For example, in Patent Document 1 below, an inspection device that inspects the external shape of the wire harness based on a captured image of the wire harness placed on a table, and notifies a missing part of the wire harness, etc. Is disclosed. Patent Document 2 below discloses a technique for estimating the illuminance of the imaging space based on the luminance of the captured image.

JP 7-103731 A JP 2013-191310 A

  By the way, when the illuminance of the imaging space deviates from a predetermined value or a predetermined range, there is a difference in information obtained from the captured image compared to the case where the illuminance is a predetermined value or within the predetermined range. there is a possibility. For this reason, if the illuminance deviates from a predetermined value or a predetermined range, if the inspection is continued as it is, the inspection accuracy may be lowered.

  Accordingly, an object of the present invention is to provide an inspection device and an illuminance monitoring device that can notify an operator of an abnormality in illuminance.

  In order to achieve the above object, an inspection apparatus according to the present invention includes an image pickup apparatus that picks up an image of an inspection object, and the image corresponding to an inspection item based on captured image information for each pixel obtained from image pickup information of the image pickup apparatus. An arithmetic processing device that inspects an inspection object and a notification device that notifies information based on a command from the arithmetic processing device. Then, when there are at least two achromatic regions having different brightness values on the captured image of the imaging device, the arithmetic processing device has a first brightness value in the first achromatic region and a second achromatic region in the first achromatic region. A lightness difference between the second lightness value is calculated, and a reference lightness difference between the first reference lightness value in the first achromatic region and the second reference lightness value in the second achromatic region is calculated. Further, the arithmetic processing device causes the notification device to output notification information that an abnormality has occurred in the illuminance around the inspection object when the difference in brightness is smaller than the reference brightness difference. It is characterized by.

  Here, when the first achromatic color region is a white achromatic color region and the second achromatic color region is a gray achromatic color region, the arithmetic processing unit is configured so that the lightness difference is smaller than the reference lightness difference. It is desirable that the notification device outputs the notification information that the illuminance around the inspection object is higher than the specified illuminance range and that the illuminance is abnormal.

  Further, when the first achromatic region is a gray achromatic region and the second achromatic region is a black achromatic region, the arithmetic processing unit, if the lightness difference is smaller than the reference lightness difference, It is desirable that notification information that the illuminance around the inspection object is lower than the specified illuminance range and that the illuminance is abnormal is output from the notification device.

  The imaging apparatus preferably includes a CCD image sensor or a CMOS image sensor as an imaging element.

  In order to achieve the above object, the illuminance monitoring device according to the present invention includes an imaging device that images an imaging object and the imaging target based on captured image information for each pixel obtained from imaging information of the imaging device. An arithmetic processing device that monitors the illuminance around the object, and a notification device that notifies information based on a command from the arithmetic processing device. Then, when there are at least two achromatic regions having different brightness values on the captured image of the imaging device, the arithmetic processing device has a first brightness value in the first achromatic region and a second achromatic region in the first achromatic region. A lightness difference between the second lightness value is calculated, and a reference lightness difference between the first reference lightness value in the first achromatic region and the second reference lightness value in the second achromatic region is calculated. Furthermore, the arithmetic processing device causes the notification device to output notification information that an abnormality has occurred in the illuminance around the imaging object when the lightness difference is smaller than the reference lightness difference. It is characterized by.

  In the inspection apparatus and the illuminance monitoring apparatus according to the present invention, at least two achromatic areas having different brightness values exist on the captured image, and a brightness difference between the first achromatic area and the second achromatic area is present. When the difference in reference brightness between the first achromatic color area and the second achromatic color area is smaller, notification information that an abnormality has occurred in the illuminance around the inspection object (imaging object) is notified. Output from the device. For this reason, the inspection device and the illuminance monitoring device prompt the operator or the like who has obtained the notification information to check or replace the illumination, and set the illuminance around the inspection object (imaging object) within the specified illuminance range. Can be brought back in.

FIG. 1 is a block diagram illustrating a configuration of the inspection apparatus according to the embodiment and the illuminance monitoring apparatus according to the modification. FIG. 2 is a diagram illustrating an example of an inspection target (imaging target). FIG. 3 is a flowchart for explaining a series of flow of illuminance determination. FIG. 4 is a flowchart for explaining the illuminance determination using the white region and the gray region. FIG. 5 is a diagram for explaining illuminance determination using a white region and a gray region. FIG. 6 is a flowchart for explaining illuminance determination using a gray region and a black region. FIG. 7 is a diagram illustrating illuminance determination using a gray region and a black region. FIG. 8 is a flowchart for explaining the illuminance determination using the white region and the black region. FIG. 9 is a diagram illustrating illuminance determination using a white region and a black region.

  Embodiments of an inspection apparatus and an illuminance monitoring apparatus according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

[Embodiment]
One embodiment of an inspection apparatus and an illuminance monitoring apparatus according to the present invention will be described with reference to FIGS.

  Reference numeral 1 in FIG. 1 indicates the inspection apparatus of the present embodiment. The inspection apparatus 1 according to the present embodiment performs an inspection according to the inspection item for the inspection object 100. In the present embodiment, description will be made assuming that an illuminance monitoring device is incorporated in the inspection device 1.

  The inspection object 100 is a single part to be inspected or an assembled part composed of a plurality of components.

  Examples of single components include electronic components such as connectors and relays, and electrical junction boxes. The inspection object 100 as a single component is composed of a single color or a plurality of colors in its appearance. When the inspection object 100 is composed of a single color, it is composed of an achromatic color or a chromatic color. On the other hand, when the inspection object 100 is composed of a plurality of colors, some of the objects are composed of a plurality of types of achromatic colors, some are composed of a plurality of types of chromatic colors, and some are achromatic colors. Some chromatic colors are mixed.

  Moreover, a wire harness etc. are mentioned as an assembly component. FIG. 2 shows a wire harness as an assembly part as an example of the inspection object 100. The inspection object 100 in FIG. 2 includes, for example, a plurality of electric wires 101, an exterior member (tape 102, protector 103) covering and covering each electric wire 101, a connector 104 attached to each electric wire 101, and each electric wire 101. A clamp 105 or the like that is fixed on the routing path is provided as a component. The color of the external appearance of each component is configured in the same manner as the color of the external appearance of the single component.

  The inspection object 100 is inspected while being held on the jig plate 110. The jig plate 110 is one in which one plane of a plate member is used as a holding surface 111 of the inspection object 100, and a jig for holding the inspection object 100 is provided on the holding surface 111. The jig is provided so that the inspection object 100 is held at a predetermined position on the holding surface 111 in a predetermined arrangement. For this reason, for example, when the inspection object 100 is a single component, the component is arranged at a predetermined position on the holding surface 111 with a predetermined appearance shape. Further, when the inspection object 100 is an assembly part, each component is arranged at a predetermined position on the holding surface 111 in a state of expressing a predetermined appearance shape.

  Here, the holding surface 111 is composed of a single color different from the inspection object 100. However, when the inspection object 100 and the holding surface 111 become similar colors, for example, a contrast different from that of the inspection object 100 so that the inspection apparatus 1 can recognize the inspection object 100 on the holding surface 111. It is desirable to form the holding surface 111 with. In this example, the holding surface 111 is white.

  When the inspection object 100 is an assembly part, the jig plate 110 may be used as an assembly work table in the assembly process of the inspection object 100 performed in the pre-inspection process.

  Below, the structure of the inspection apparatus 1 of this embodiment is demonstrated.

  The inspection apparatus 1 inspects an inspection object 100 using a captured image and informs an operator or the like of the inspection result. For this reason, the inspection apparatus 1 includes an imaging device 10, an arithmetic processing device 20, a display device 30, and a notification device 40.

  The imaging device 10 images the inspection object 100 together with the holding surface 111 of the jig plate 110. The imaging device 10 may image the entire holding surface 111 at a time and use it as an imaging region. The entire holding surface 111 is divided into a plurality of sections and images are taken for each section. Each may be an imaging region. Further, the imaging device 10 may be configured to capture a predetermined area on the holding surface 111. The predetermined area is, for example, imaging of an area where a certain part (part having a characteristic shape or the like) of the inspection object 100 exists, an area where a component constituting the inspection object 100 exists, or the like. It is an area.

  The imaging device 10 generates imaging information for each pixel as the object is imaged. The imaging apparatus 10 generates captured image information (hereinafter referred to as “captured image information”) for each pixel based on the imaging information for each pixel, and the captured image information is wired or wireless to the arithmetic processing unit 20. The imaging information for each pixel may be transmitted to the arithmetic processing unit 20 by wire or wirelessly. When the image processing information for each pixel is received, the arithmetic processing device 20 calculates the imaged image information for each pixel based on this image capturing information.

  The captured image information is information for each pixel related to the captured image. For example, the captured image information includes hue value information representing hue, saturation value information representing saturation, brightness value information representing brightness, gradation value information representing gradation, RGB value information representing RGB values, and luminance. There is luminance value information to be represented. Here, some of the captured image information is calculated based on other captured image information. For example, as described later, the hue value information and the like can be obtained from the RGB value information. For this reason, for example, when the RGB value information is received but the hue value information is not received, the arithmetic processing device 20 may calculate the hue value information based on the received RGB value information.

  Specifically, the image pickup apparatus 10 can be used such as one provided with a CCD (charge coupled device) image sensor as an image pickup device, one provided with a CMOS (complementary metal oxide semiconductor) image sensor as an image pickup device, and the like. It is.

  The arithmetic processing device 20 causes the display device 30 to display the captured image of the imaging device 10. The display device 30 may be a monitor that simply displays information, or may be a so-called touch panel monitor that displays operation buttons and the like for inspection together with the information.

  The arithmetic processing device 20 inspects the inspection object 100 according to the inspection item based on the captured image information for each pixel obtained from the imaging information of the imaging device 10. For example, the arithmetic processing device 20 performs the inspection by comparing the captured image information with the comparison reference information.

  The comparison reference information is reference information for comparison with captured image information at the time of inspection. Specifically, the comparison reference information is, for example, captured image information when a normal part (single part or assembly part) as designed on the holding surface 111 is imaged at a normal position and arrangement, or It is estimated information corresponding to captured image information. The comparison reference information is stored in advance in the storage device 21 as information for each regular component. That is, information such as hue value information for each pixel related to the captured image of the regular part on the holding surface 111 is prepared in the storage device 21.

  When the inspection object 100 is inspected, it is assumed that the inspection object 100 is a regular part, and the arithmetic processing unit 20 reads comparison reference information related to the regular part from the storage device 21. Then, the arithmetic processing device 20 compares the comparison reference information with the captured image information of the inspection object 100 obtained from the imaging information of the imaging device 10 for each pixel. In the comparison, the same kind of information is compared between the comparison reference information and the captured image information. In the comparison, for example, the captured image information of the pixel to be inspected on the captured image of the inspection object 100 is compared with the comparison reference information of the estimated pixel that is estimated to be the same as the pixel. The pixel comparison reference information in a predetermined area around the estimated pixel is also compared with the captured image information of the pixel to be inspected. The arithmetic processing unit 20 sequentially switches the inspection target pixels on the captured image, and compares the captured image information of the new inspection target pixel with the comparison reference information. The arithmetic processing unit 20 performs the inspection according to the inspection item in this way.

  The arithmetic processing device 20 causes the notification device 40 to output the inspection result. The notification device 40 notifies information based on a command from the arithmetic processing device 20. Examples of the notification device 40 include those that stimulate hearing and those that stimulate vision. The alarm device 40 that stimulates hearing is, for example, a device that conveys the contents of a test result to an operator or the like by voice information or sound information (beep sound or the like). The notification device 40 that stimulates vision visually conveys the contents of an inspection result to an operator or the like using character information. Moreover, the notification device 40 that stimulates the sight may be a lamp or the like that conveys the abnormality by lighting or blinking. The information on the test result that stimulates the sight may be output to the display device 30 instead of the notification device 40.

  The inspection device 1 performs, for example, an inspection of the presence / absence of a component, a correctness / incorrectness of a component, an inspection of an assembled state of a component, etc. as inspection items. Below, an example of the inspection method of these various inspections is shown.

  The inspection of the presence / absence of parts means that the inspection object 100 or each component part of the inspection object 100 is a regular part as designed on the holding surface 111 where the regular part should exist. This is an inspection which first examines whether or not any part (inspection object 100 or a component part of the inspection object 100) exists at a predetermined position as designed.

  In the inspection of the presence / absence of the parts, the captured image information is used to obtain the inspection result regardless of whether the regular part, the inspection object 100 or each component of the inspection object 100 is achromatic or chromatic. Lightness value information at is used. For example, the arithmetic processing device 20 generates a brightness image that represents the captured image in brightness based on the brightness value information for each pixel in the captured image. On the brightness image, an area of pixels in which the same or similar brightness values are gathered (hereinafter referred to as “brightness value area”) is generated. Similarity refers to the relationship between those having such a small difference in brightness value that they can be considered as the same brightness value, such as within an error range. When any part is present on the holding surface 111, a brightness value area related to the part appears on the brightness image in addition to the brightness value area indicating the holding face 111.

  The arithmetic processing device 20 uses the lightness image and lightness value information (hereinafter referred to as “reference lightness value information”) in the comparison reference information of the storage device 21 or a lightness image based on the reference lightness value information (hereinafter referred to as “reference lightness”). "Image")). For example, the arithmetic processing unit 20 uses the lightness value area related to the normal part generated based on the reference lightness value information (hereinafter referred to as “reference lightness value area”) or the reference related to the normal part on the reference lightness image. It is determined whether or not a brightness value area corresponding to the brightness value area exists on the brightness image.

  When the lightness value region corresponding to the reference lightness value region is present on the lightness image, the arithmetic processing unit 20 detects some component (inspection target) at a predetermined position on the holding surface 111 where the regular component should be present. It can be determined that there is an object 100 or a component of the inspection object 100). The arithmetic processing device 20 causes the notification device 40 to output the determination result as the inspection result.

  In addition, when the brightness value area corresponding to the reference brightness value area does not exist on the brightness image, the inspection object 100 or a component of the inspection object 100 exists at a predetermined position on the holding surface 111. You can see that it is not. For this reason, in this case, the arithmetic processing unit 20 can determine that there is no regular part at the predetermined position. The arithmetic processing device 20 causes the notification device 40 to output the determination result as the inspection result. Thereby, the worker etc. to whom the inspection result is transmitted, for example, temporarily stops the inspection apparatus 1 and performs the operation of attaching the missing part or removes the inspection object 100 from the production line. Can do.

  The inspection for the presence / absence of the component may be performed using other captured image information (for example, gradation value information or RGB value information) instead of the lightness value information. Further, when inspecting the presence or absence of a chromatic color component, the hue value information may be used.

  The correct / incorrect inspection of a part is an inspection for checking whether or not a part (inspection object 100 or a component part of the inspection object 100) found in the presence / absence inspection of a part is a regular part. The inspection of the assembly state of the parts is an inspection performed when an assembly part is an inspection target, and is an inspection for checking whether or not the component parts are correctly assembled as designed.

  For example, when the regular component to be inspected is an achromatic color, the arithmetic processing device 20 determines whether or not the captured image information of the pixel related to the found component has hue value information. When the pixel has hue value information, the arithmetic processing unit 20 determines that the found component is a chromatic color and is not a regular component but a different product. The arithmetic processing device 20 causes the notification device 40 to output the determination result of the different product as the inspection result.

  When the pixel does not have hue value information, the arithmetic processing device 20 compares the lightness value of the pixel with the reference lightness value. If the lightness value and the reference lightness value are not the same or similar, the arithmetic processing unit 20 determines that the found component is an achromatic color but is not a regular component but a different product. The arithmetic processing device 20 causes the notification device 40 to output the determination result of the different product as the inspection result.

  When the lightness value and the reference lightness value are the same or similar, the arithmetic processing unit 20, for example, the lightness value of the contour of the lightness value region related to the found part, the pixels forming this contour, and the pixels surrounding the pixel Is compared with the reference lightness value at, and it is determined whether or not a contour having the same or equivalent shape as the contour of the lightness value region exists in the reference lightness image.

  When such a contour exists in the reference brightness image, the arithmetic processing device 20 determines that the found component is a regular component, and uses the determination result that the regular component is a regular component as an inspection result. The notification device 40 outputs the information. In addition, when the regular part is a component part of an assembly part, it is determined that it is a regular part and that it is correctly assembled as designed, and these determination results are used as inspection results. The notification device 40 can output the information.

  On the other hand, when the contour having the same or equivalent shape as the contour of the lightness value region does not exist in the reference lightness image, the arithmetic processing unit 20 determines that the found component is not a regular component but a different product. The determination result is output to the notification device 40 as the inspection result. However, even when the found part is a regular part and is not correctly assembled as designed, the arithmetic processing unit 20 has a contour having the same or equivalent shape as the contour of the lightness value region. There is a possibility of determining that the image does not exist. For this reason, when such a contour does not exist in the reference lightness image, the arithmetic processing unit 20 displays, for example, information on both the possibility of non-conformity and the possibility of improper assembly as designed. May be output to the notification device 40.

  When the regular part to be inspected is a chromatic color, the arithmetic processing unit 20 determines whether or not the captured image information of the pixel related to the found part has hue value information. When the pixel does not have hue value information, the arithmetic processing unit 20 determines that the found component is an achromatic color and is not a regular component but a different product. The arithmetic processing device 20 causes the notification device 40 to output the determination result of the different product as the inspection result.

  When the pixel has hue value information, the arithmetic processing unit 20 reads the hue value information (hereinafter referred to as “reference hue value information”) in the comparison reference information of the pixel from the storage device 21, and The hue value of the pixel is compared with the reference hue value. If the hue value and the reference hue value are not the same or similar, the arithmetic processing unit 20 determines that the found part is not a regular part but a different part. The arithmetic processing device 20 causes the notification device 40 to output the determination result of the different product as the inspection result. Similarity refers to a relationship between those having such a small difference in hue values that can be considered as the same hue value, such as within an error range.

  In the case where the hue value and the reference hue value are the same or similar, the same or similar in the area where each pixel related to the found part is gathered or the area where the pixel is gathered and its surrounding area There is an area in which hue values are gathered (hereinafter referred to as “hue value area”). Therefore, in this case, for example, the arithmetic processing unit 20 compares the hue value of the outline of the hue value region with the reference hue values of the pixels forming the outline and the pixels around the pixel, and the hue value thereof. It is determined whether or not a contour having the same or equivalent shape as the contour of the region exists in the reference hue image. The hue image is a captured image represented by hue based on hue value information for each pixel in the captured image. The reference hue image is obtained by replacing each pixel of the hue image with a reference hue value. For example, the arithmetic processing device 20 performs determination in the same manner as in the case of an achromatic color depending on whether or not such a contour exists in the reference hue image, and the determination result is used as the inspection result to notify the notification device 40. To output.

  Note that the correctness / incorrectness of the component may be performed using other captured image information (for example, gradation value information or RGB value information) instead of the hue value information.

  An operator or the like who has been informed of the inspection result of a different product can, for example, temporarily stop the inspection apparatus 1 and replace the different product with a regular part or remove the inspection object 100 from the production line. .

  Also, an operator who is informed of the inspection results of both the possibility of non-conformity and the possibility of improper assembly as designed, for example, temporarily stops the inspection apparatus 1 and whether or not it is non-conformity. It can be confirmed whether the state is just bad, or the inspection object 100 can be removed from the production line. Then, the worker or the like can replace the different article with a regular part or correct the assembled state.

  As described above, in the inspection apparatus 1, the inspection target 100 is inspected using the captured image information obtained from the imaging information of the imaging apparatus 10.

  By the way, the captured image information is color information related to colors such as hue value information, saturation value information, brightness value information, gradation value information, RGB value information, and luminance value information, as described above. . These captured image information values change according to the illuminance around the inspection object 100. For example, RGB values are index values of color components in the RGB color system (hereinafter referred to as “color component values”), and the RGB values are index values (colors) of the R component, the G component, and the B component. Component value) and changes according to the illuminance around the inspection object 100. An R component index value (hereinafter referred to as “R value”), a G component index value (hereinafter referred to as “G value”), and a B component index value (hereinafter referred to as “B value”) The higher the illuminance, the larger, while the lower the illuminance, the smaller. It is known that the hue value, the saturation value, and the brightness value change according to the RGB values (R value, G value, B value), respectively. The brightness value increases as the illuminance around the inspection object 100 increases, and decreases as the illuminance decreases. The luminance value is an index value of the brightness of the light source, and increases as the illuminance around the inspection object 100 increases, and decreases as the illuminance decreases. The luminance value is related to the gradation value. The gradation value represents the gradation in each of the R value, the G value, and the B value. The gradation value increases as the illuminance around the inspection object 100 increases, and decreases as the illuminance decreases.

  Therefore, the comparison reference information to be compared with the captured image information includes captured image information obtained when the illuminance around the inspection object 100 is a predetermined illuminance (hereinafter referred to as “specified illuminance”) or Estimation information corresponding to the captured image information is used. The specified illuminance is predetermined as the illuminance around the inspection object 100 that can be inspected.

  The prescribed illuminance is set based on, for example, the illuminance around the inspection object 100 that allows the inspection object 100 to be recognized as the achromatic color from the captured image information of the inspection object 100 of a certain achromatic color. . The specified illuminance is set based on the illuminance around the inspection object 100 that allows the inspection object 100 to be recognized as the chromatic color from the captured image information of the inspection object 100 of a certain chromatic color. .

  For example, an equivalent gray can be detected from the captured image information of the gray inspection object 100 under a prescribed illuminance or in a predetermined range centered on the prescribed illuminance (hereinafter referred to as “specified illuminance range”). . However, when the illuminance around the inspection object 100 is higher than the specified illuminance range, a color that is whiter than gray may be detected from the captured image information of the gray inspection object 100. . Further, when the illuminance around the inspection object 100 is lower than the specified illuminance range, there is a possibility that a color that is darker than gray is detected from the captured image information of the gray inspection object 100. This shift due to the level of illuminance appears as a similar phenomenon in chromatic colors. For this reason, in this inspection apparatus 1, it is desirable to predetermine the illuminance range (specified illuminance range) defined as the inspection execution condition.

  The prescribed illuminance range and the prescribed illuminance may be determined based on the illuminance capable of acquiring captured image information that can identify the inspection object 100 as an actual object. In other words, the specified illuminance range can specify an area where the inspection object 100 exists on the captured image based on the captured image information, and the inspection object 100 is a regular part. May be set based on the illuminance that can be specified based on the captured image information.

  Since the inspection apparatus 1 performs the inspection under the condition of illuminance that is such a constant reference, it is possible to suppress the occurrence of variations in inspection results. However, in the inspection apparatus 1, when the illuminance around the inspection object 100 during inspection is out of the specified illuminance range, the captured image information of each pixel of the inspection object 100 is the comparison reference information in each pixel. There is a possibility that a correct test result cannot be obtained because the image is greatly deviated from (the captured image information at the specified illuminance). For example, when the illuminance deviates from the specified illuminance range, the brightness value, hue value, etc. of each pixel due to the RGB value shift in each pixel of the inspection object 100 as compared to the case of the specified illuminance range. Will shift greatly. For this reason, in this case, although the inspection object 100 is a regular part, there is a possibility that an inspection result indicating that it is a non-defective product may be output. Therefore, in this inspection apparatus 1, the illuminance around the inspection object 100 is monitored at a predetermined monitoring timing such as before the start of inspection or during inspection, and whether or not the illuminance is within a specified illuminance range suitable for inspection. Determine. For example, the illuminance monitoring may be performed at predetermined intervals during the inspection, or may be performed as needed during the inspection. The inspection apparatus 1 is configured such that when the illuminance around the inspection object 100 is out of the specified illuminance range, information to that effect is transmitted to the operator or the like. That is, the inspection device 1 is provided with an illuminance monitoring device that monitors the illuminance around the inspection object 100 and notifies an operator or the like when the illuminance falls outside the specified illuminance range.

  In monitoring the illuminance, the arithmetic processing device 20 controls the imaging device 10 to image the inspection object 100 and the holding surface 111 of the jig plate 110. Then, the arithmetic processing device 20 stores the captured image information of each pixel related to the captured image in the storage device 21. The storage device 21 stores the captured image information for each frame of the captured image. The arithmetic processing device 20 monitors the illuminance around the inspection object 100 using the captured image information. The captured image information may be obtained by causing the imaging device 10 to take an image for monitoring the illuminance, or may be obtained in the course of the inspection. In the following, when simply referred to as a captured image, it refers to a captured image in a certain frame.

  The arithmetic processing unit 20 specifies the achromatic color region and the chromatic color region on the captured image based on the captured image information of each pixel related to the captured image. For example, the arithmetic processing device 20 reads RGB value information for each pixel of the captured image from the storage device 21 and calculates an achromatic color region and a chromatic color region. Thereby, the arithmetic processing unit 20 can specify the achromatic color region and the chromatic color region on the captured image based on the calculation result. Furthermore, the arithmetic processing unit 20 can identify a white achromatic region, a black achromatic region, and a gray achromatic region on the captured image. Moreover, the arithmetic processing unit 20 can identify a chromatic color region for each color on the captured image.

  When there are at least two achromatic regions having different brightness values on the captured image, the arithmetic processing device 20 uses the brightness value information in the captured image information of the achromatic color region and uses the brightness value information in the surroundings of the inspection object 100. Illuminance can be monitored. This monitoring is performed when the normal inspection object 100 is achromatic or when the components of the normal inspection object 100 include achromatic parts.

  For example, when there are at least two achromatic regions having different brightness values on the captured image, the arithmetic processing device 20 is referred to as, for example, an achromatic region having the first brightness value (hereinafter referred to as “first achromatic region”). ) And an achromatic region of the second lightness value (hereinafter referred to as “second achromatic region”), the first lightness value in the first achromatic region and the second lightness value in the second achromatic region. The difference between the two lightness values (hereinafter referred to as “lightness difference”) is calculated, and the first reference lightness value in the first achromatic region and the second reference lightness value in the second achromatic region are calculated. The difference between them (hereinafter referred to as “reference brightness difference”) is calculated. Then, the arithmetic processing device 20 monitors the illuminance around the inspection object 100 by comparing the lightness difference with the reference lightness difference. As will be described later, when the lightness difference is smaller than the reference lightness difference, the arithmetic processing unit 20 determines that the illuminance is out of the specified illuminance range, and an abnormality has occurred in the illuminance, The notification information corresponding to the determination result is output from the notification device 40.

  Here, the first reference lightness value is a reference lightness value preset for each pixel in the first achromatic region. The second reference lightness value is a reference lightness value preset for each pixel in the second achromatic region. Therefore, the first reference brightness value and the second reference brightness value can be obtained from the reference brightness value information in the comparison reference information of the storage device 21 described above.

  The arithmetic processing related to the illuminance monitoring will be specifically described with reference to the flowchart of FIG.

  The arithmetic processing unit 20 determines whether or not there are achromatic regions having different brightness values on the captured image (step ST1). Here, it is determined whether or not two or more achromatic regions having different brightness values exist.

  If two or more achromatic regions do not exist on the captured image, the arithmetic processing device 20 once ends this arithmetic processing. After that, the arithmetic processing device 20 may execute the determination in step ST1 on the captured image of the next frame, for example.

  When there are two or more achromatic regions on the captured image, the arithmetic processing device 20 selects these as achromatic regions for illuminance monitoring, and includes a white achromatic region and a gray achromatic color in them. It is determined whether or not an area exists (step ST2).

  When there are white and gray achromatic regions, the arithmetic processing unit 20 has a lightness value (first lightness value) and a reference lightness value (first reference value) in the white achromatic region (first achromatic region). (Brightness value) and the brightness value (second brightness value) and the reference brightness value (second reference brightness value) in the gray achromatic region (second achromatic region). Is determined (step ST3).

  On the other hand, when the white and gray achromatic regions do not exist, the arithmetic processing unit 20 includes a gray achromatic region and a black achromatic region in the achromatic region for illuminance monitoring. It is determined whether or not (step ST4).

  When the gray and black achromatic regions exist, the arithmetic processing unit 20 proceeds to step ST3, and the lightness value (first lightness value) and the reference lightness in the gray achromatic region (first achromatic region). Inspection using the value (first reference brightness value) and the brightness value (second brightness value) and the reference brightness value (second reference brightness value) in the black achromatic area (second achromatic area) The illuminance around the object 100 is determined.

  If it is determined in step ST4 that the gray and black achromatic regions do not exist, a white achromatic region and a black achromatic region exist in the achromatic region for illuminance monitoring. It is possible that For this reason, the arithmetic processing unit 20 in this case determines whether or not a white achromatic color region and a black achromatic color region exist in the achromatic color region for illuminance monitoring (step ST5). .

  When the white and black achromatic regions exist, the arithmetic processing unit 20 proceeds to step ST3, and the lightness value (first lightness value) and the reference lightness in the white achromatic region (first achromatic region). Inspection using the value (first reference brightness value) and the brightness value (second brightness value) and the reference brightness value (second reference brightness value) in the black achromatic area (second achromatic area) The illuminance around the object 100 is determined.

  On the other hand, when there is no white and black achromatic region, that is, when there are only achromatic regions of similar colors having different brightness values, the arithmetic processing unit 20 temporarily ends this arithmetic processing. . After that, the arithmetic processing device 20 may execute the determination in step ST1 on the captured image of the next frame, for example.

  After determining the illuminance at step ST3, the arithmetic processing unit 20 notifies the operator or the like of notification information via the notification device 40 (step ST6). As the notification information, the information for stimulating hearing such as voice information and sound information (beep sound, etc.) and the visual information such as lighting or blinking of the character information are stimulated in the same manner as the notification information of the test result described above. Information is generated. Information that stimulates the sight may be output to the display device 30 in the same manner as the notification information of the examination result described above.

  In this example, the presence / absence of the white achromatic region and the gray achromatic region is first determined. However, the arithmetic processing unit 20 determines whether or not the determination in step ST2 (white achromatic region and gray achromatic color). Determination of presence / absence of region) and determination in step ST4 (determination of presence / absence of gray achromatic region and black achromatic region) and determination in step ST5 (white achromatic region and black achromatic region) The determination of presence / absence) may be executed in any order.

  Hereinafter, the determination of illuminance in step ST3 will be specifically described.

  First, the case where white and gray achromatic regions are present on the captured image will be described with reference to the flowchart of FIG.

  When there is a white and gray achromatic region, the arithmetic processing unit 20 provides the lightness value information and reference lightness value information in the white achromatic region (hereinafter also referred to as “white region”), and the gray color region. The brightness value information and the reference brightness value information in the achromatic color area (hereinafter also referred to as “gray area”) are read from the storage device 21 and acquired (step ST11). The arithmetic processing unit 20 determines the illuminance based on the combination of the white area and the gray area.

  The brightness value information and the reference brightness value information of the white area are obtained by associating with the pixel to be monitored in the white area (for example, the pixel existing in the central portion of the white area). Similarly, the lightness value information and the reference lightness value information of the gray area are associated with the monitoring target pixel in the gray area (for example, the pixel that exists in the central portion of the gray area). get.

  Here, there may be a plurality of similar achromatic regions having different brightness values on the captured image. When there are a plurality of white areas and gray areas having different brightness values on the captured image, a plurality of combinations of one type of white area and one type of gray area are determined, and a white color is set for each combination. The brightness value information and reference brightness value information of the area, and the brightness value information and reference brightness value information of the gray area may be acquired.

  The arithmetic processing unit 20 calculates a difference between the brightness values of the white area and the gray area (hereinafter referred to as “brightness difference”) Db based on the brightness value information of the combination of the white area and the gray area. (Step ST12). Here, the absolute value of the brightness difference Db is calculated. In addition, the arithmetic processing unit 20 determines a difference between the reference brightness values of the white area and the gray area (hereinafter referred to as “reference brightness difference”) based on the reference brightness value information of the combination of the white area and the gray area. .) Dbb is calculated (step ST13). Here, the absolute value of the reference brightness difference Dbb is calculated.

  Here, the brightness values of achromatic colors (white, black, gray) increase as the illuminance increases, and decrease as the illuminance decreases. Further, the brightness value of the achromatic color decreases in the order of white, gray, and black when the illuminance is constant. The brightness difference Db between the white region and the gray region is maintained at a substantially constant value when the illuminance around the inspection object 100 is within the specified illuminance range. However, the brightness value of white increases as the illuminance increases, and eventually saturates at the upper limit depending on the performance of the imaging device 10 such as a CCD image sensor. For this reason, after the white brightness value reaches the upper limit value, the gray brightness value approaches the upper limit value as the illuminance increases. At that time, the absolute value of the brightness difference Db between the white area and the gray area is smaller than the absolute value of the reference brightness difference Dbb between the white area and the gray area (FIG. 5). FIG. 5 shows the absolute value of the brightness difference Db between white and gray (the absolute value of the reference brightness difference Dbb) when the illuminance around the inspection object 100 is within the specified illuminance range (when the illuminance is normal). It shows the absolute value of the brightness difference Db between white and gray when the illuminance is higher than the specified illuminance range (when the illuminance is abnormal).

  If the illuminance increases until such white brightness value reaches the upper limit value, it becomes difficult to specify a region using the brightness value, the hue value, and the like on the captured image. In the inspection apparatus 1, even if the inspection is continued as it is, it may be difficult to obtain a good inspection result. Therefore, the arithmetic processing unit 20 determines whether or not the absolute value of the brightness difference Db between the white area and the gray area matches the absolute value of the reference brightness difference Dbb between the white area and the gray area (step ST14). If a plurality of combinations of white areas and gray areas are set, this determination may be executed for each combination.

  If the absolute value of the brightness difference Db and the absolute value of the reference brightness difference Dbb match, it can be seen that the illuminance around the inspection object 100 is within the specified illuminance range. For this reason, the arithmetic processing unit 20 determines that the illuminance around the inspection object 100 is within the specified illuminance range when the absolute value of the brightness difference Db matches the absolute value of the reference brightness difference Dbb. It performs (step ST15). In this case, the arithmetic processing unit 20 proceeds to step ST6, and notifies the operator or the like of notification information that the illuminance is normal.

  On the other hand, when the absolute value of the brightness difference Db and the absolute value of the reference brightness difference Dbb do not match, the arithmetic processing unit 20 determines that the absolute value of the brightness difference Db is greater than the absolute value of the reference brightness difference Dbb. It is determined whether or not it is also smaller (step ST16).

  When the absolute value of the brightness difference Db is smaller than the absolute value of the reference brightness difference Dbb, it is considered that the illuminance around the inspection object 100 is higher than the specified illuminance range. Therefore, when the absolute value of the lightness difference Db is smaller than the absolute value of the reference lightness difference Dbb, the arithmetic processing unit 20 has an illuminance around the inspection object 100 that is higher than the specified illuminance range, and the illuminance is abnormal. (Step ST17). In this case, the arithmetic processing unit 20 proceeds to step ST6 and informs the operator of the illuminance abnormality notification information corresponding to the determination result.

  On the other hand, when the absolute value of the brightness difference Db is not smaller (that is, larger) than the absolute value of the reference brightness difference Dbb, for example, the inspection object 100 in the white region or the inspection object 100 in the gray region is detected. Some abnormality may have occurred, for example, if it is a different product. For this reason, the arithmetic processing unit 20 in this case determines that there is a possibility of occurrence of some abnormality (step ST18). In this case, the arithmetic processing unit 20 proceeds to step ST6, and notifies the operator or the like of notification information that some abnormality may occur.

  Next, a case where gray and black achromatic regions are present on the captured image will be described with reference to the flowchart of FIG.

  When there is a gray region and a black achromatic region (hereinafter, also referred to as “black region”), the arithmetic processing device 20 has lightness value information and reference lightness value information in the gray region, and the black region. The lightness value information and the reference lightness value information are read and acquired from the storage device 21 (step ST21). The arithmetic processing unit 20 determines the illuminance based on the combination of the gray area and the black area.

  As the lightness value information and the reference lightness value information of the gray area, the same information as that obtained in step ST11 of FIG. 4 may be acquired. Further, the brightness value information and the reference brightness value information of the black area are acquired in association with the monitoring target pixel in the black area (for example, the pixel existing in the central portion of the black area).

  Here, when there are a plurality of gray areas or black areas having different brightness values on the captured image, a plurality of combinations of one type of gray area and one type of black area are determined from the gray areas and black areas. The lightness value information and the reference lightness value information for the gray area, and the lightness value information and the reference lightness value information for the black area may be acquired for each time.

  The arithmetic processing unit 20 calculates the lightness difference Db between the gray region and the black region based on the lightness value information of each combination of the gray region and the black region (step ST22). Here, the absolute value of the brightness difference Db is calculated. Further, the arithmetic processing unit 20 calculates the reference brightness difference Dbb between the gray area and the black area based on the reference brightness value information of the combination of the gray area and the black area (step ST23). Here, the absolute value of the reference brightness difference Dbb is calculated.

  Similar to the brightness difference Db between the white area and the gray area, the brightness difference Db between the gray area and the black area maintains a substantially constant value when the illuminance around the inspection object 100 is within the specified illuminance range. However, the brightness value of black decreases as the illuminance decreases, and eventually saturates at the lower limit depending on the performance of the imaging device 10 such as a CCD image sensor. Therefore, after the black brightness value reaches the lower limit value, the gray brightness value approaches the lower limit value as the illuminance decreases. At that time, the absolute value of the brightness difference Db between the gray area and the black area is smaller than the absolute value of the reference brightness difference Dbb between the gray area and the black area (FIG. 7). FIG. 7 shows the absolute value of the brightness difference Db between gray and black (the absolute value of the reference brightness difference Dbb) when the illuminance around the inspection object 100 is within the specified illuminance range (when the illuminance is normal). It shows the absolute value of the brightness difference Db between gray and black when the illuminance is lower than the specified illuminance range (when the illuminance is abnormal).

  If the illuminance decreases until such a black brightness value reaches the lower limit value, it becomes difficult to specify an area using the brightness value, the hue value, or the like on the captured image. In the inspection apparatus 1, even if the inspection is continued as it is, it may be difficult to obtain a good inspection result. Therefore, the arithmetic processing unit 20 determines whether or not the absolute value of the brightness difference Db between the gray area and the black area matches the absolute value of the reference brightness difference Dbb between the gray area and the black area (step ST24). If a plurality of combinations of gray areas and black areas are set, this determination may be executed for each combination.

  If the absolute value of the brightness difference Db and the absolute value of the reference brightness difference Dbb match, it can be seen that the illuminance around the inspection object 100 is within the specified illuminance range. For this reason, the arithmetic processing unit 20 determines that the illuminance around the inspection object 100 is within the specified illuminance range when the absolute value of the brightness difference Db matches the absolute value of the reference brightness difference Dbb. It performs (step ST25). In this case, the arithmetic processing unit 20 proceeds to step ST6, and notifies the operator or the like of notification information that the illuminance is normal.

  On the other hand, when the absolute value of the brightness difference Db and the absolute value of the reference brightness difference Dbb do not match, the arithmetic processing unit 20 determines that the absolute value of the brightness difference Db is greater than the absolute value of the reference brightness difference Dbb. It is determined whether or not the value is smaller (step ST26).

  When the absolute value of the brightness difference Db is smaller than the absolute value of the reference brightness difference Dbb, it is considered that the illuminance around the inspection object 100 is lower than the specified illuminance range. Therefore, when the absolute value of the brightness difference Db is smaller than the absolute value of the reference brightness difference Dbb, the arithmetic processing unit 20 has an illuminance around the inspection object 100 that is lower than the specified illuminance range, and an abnormality occurs in this illuminance. (Step ST27). In this case, the arithmetic processing unit 20 proceeds to step ST6 and informs the operator of the illuminance abnormality notification information corresponding to the determination result.

  On the other hand, when the absolute value of the brightness difference Db is not smaller (that is, larger) than the absolute value of the reference brightness difference Dbb, for example, the inspection object 100 in the gray area or the inspection object 100 in the black area Some abnormality may have occurred, for example, if it is a different product. For this reason, the arithmetic processing unit 20 in this case determines that there is a possibility of occurrence of some abnormality (step ST28). In this case, the arithmetic processing unit 20 proceeds to step ST6, and notifies the operator or the like of notification information that some abnormality may occur.

  Next, a case where white and black achromatic regions are present on the captured image will be described based on the flowchart of FIG.

  When the white region and the black region exist, the arithmetic processing device 20 stores the lightness value information and the reference lightness value information in the white region, and the lightness value information and the reference lightness value information in the black region. 21 is read and acquired (step ST31). The arithmetic processing unit 20 determines the illuminance based on the combination of the white area and the black area.

  The lightness value information and the reference lightness value information of the white area may be obtained as those obtained in step ST11 of FIG. Moreover, what is necessary is just to acquire the same thing as what was obtained by step ST21 of FIG. 6 as the brightness value information and reference | standard brightness value information of a black area | region.

  Here, when there are a plurality of white areas and black areas having different brightness values on the captured image, a plurality of combinations of one type of white area and one type of black area are determined, and each combination is determined. The brightness value information and reference brightness value information of the white area and the brightness value information and reference brightness value information of the black area may be acquired for each time.

  The arithmetic processing unit 20 calculates the brightness difference Db between the white area and the black area based on the brightness value information of each combination of the white area and the black area (step ST32). Here, the absolute value of the brightness difference Db is calculated. Further, the arithmetic processing unit 20 calculates the reference brightness difference Dbb between the white area and the black area based on the reference brightness value information of each combination of the white area and the black area (step ST33). Here, the absolute value of the reference brightness difference Dbb is calculated.

  The brightness difference Db between the white region and the black region is maintained at a substantially constant value when the illuminance around the inspection object 100 is within the specified illuminance range. However, when the illuminance is high enough to exceed the specified illuminance range, the brightness value of white is saturated at the upper limit, and the absolute value of the brightness difference Db between the white area and the black area is white area and black area. Is smaller than the absolute value of the reference brightness difference Dbb (FIG. 9). When the illuminance is low enough to exceed the specified illuminance range, the brightness value of black is saturated at the lower limit, and the absolute value of the brightness difference Db between the white area and the black area is white area and black area. Is smaller than the absolute value of the reference brightness difference Dbb (FIG. 9). FIG. 9 shows the absolute value of the brightness difference Db between white and black (the absolute value of the reference brightness difference Dbb) when the illuminance around the inspection object 100 is within the specified illuminance range (when the illuminance is normal). The absolute value of the brightness difference Db between white and black when the illuminance is higher than the specified illuminance range (when the illuminance is abnormal), and white and black when the illuminance is lower than the specified illuminance range (when the illuminance is abnormal) And the absolute value of the brightness difference Db between the two.

  Therefore, the arithmetic processing unit 20 determines whether or not the absolute value of the brightness difference Db between the white area and the black area matches the absolute value of the reference brightness difference Dbb between the white area and the black area (step ST34). If a plurality of combinations of white areas and black areas are set, this determination may be executed for each combination.

  If the absolute value of the brightness difference Db and the absolute value of the reference brightness difference Dbb match, it can be seen that the illuminance around the inspection object 100 is within the specified illuminance range. For this reason, the arithmetic processing unit 20 determines that the illuminance around the inspection object 100 is within the specified illuminance range when the absolute value of the brightness difference Db matches the absolute value of the reference brightness difference Dbb. It performs (step ST35). In this case, the arithmetic processing unit 20 proceeds to step ST6, and notifies the operator or the like of notification information that the illuminance is normal.

  On the other hand, when the absolute value of the brightness difference Db and the absolute value of the reference brightness difference Dbb do not match, the arithmetic processing unit 20 determines that the absolute value of the brightness difference Db is greater than the absolute value of the reference brightness difference Dbb. It is determined whether or not the value is smaller (step ST36).

  When the absolute value of the brightness difference Db is smaller than the absolute value of the reference brightness difference Dbb, it is considered that the illuminance around the inspection object 100 is out of the specified illuminance range. Therefore, when the absolute value of the brightness difference Db is smaller than the absolute value of the reference brightness difference Dbb, the arithmetic processing unit 20 determines whether, for example, the brightness value Vw of the white region has reached the upper limit value Vw (max). Is determined (step ST37).

  When the brightness value Vw of the white region reaches the upper limit value Vw (max), the arithmetic processing unit 20 has an illuminance around the inspection object 100 that is higher than the specified illuminance range, and the illuminance is abnormal. Is determined (step ST38). In this case, the arithmetic processing unit 20 proceeds to step ST6 and informs the operator of the illuminance abnormality notification information corresponding to the determination result.

  On the other hand, when the brightness value Vw of the white region does not reach the upper limit value Vw (max), the arithmetic processing unit 20 determines that the illuminance around the inspection object 100 is lower than the specified illuminance range. Also good. However, in this example, when the brightness value Vw of the white area has not reached the upper limit value Vw (max), it is determined whether or not the brightness value Vb of the black area has reached the lower limit value Vb (min) (step) ST39).

  When the lightness value Vb of the black region reaches the lower limit value Vb (min), the arithmetic processing unit 20 has an illuminance around the inspection object 100 lower than the specified illuminance range, and the illuminance is abnormal. Is determined (step ST40). In this case, the arithmetic processing unit 20 proceeds to step ST6 and informs the operator of the illuminance abnormality notification information corresponding to the determination result.

  On the other hand, when the lightness value Vb of the black area does not reach the lower limit value Vb (min), for example, when the inspection object 100 in the white area or the inspection object 100 in the black area is different, something An abnormality may have occurred. Such an abnormality may also occur when the absolute value of the brightness difference Db between the white area and the black area is not smaller (that is, larger) than the absolute value of the reference brightness difference Dbb between the white area and the black area. . For this reason, the arithmetic processing unit 20 in these cases determines that there is a possibility of occurrence of some abnormality (step ST41). In this case, the arithmetic processing unit 20 proceeds to step ST6, and notifies the operator or the like of notification information that some abnormality may occur.

  By the way, in this exemplification, it has been described that the calculation process is temporarily ended when there is only an achromatic color region of similar colors having different brightness values in the achromatic color region for illuminance monitoring. However, from the viewpoint described in the specific description above, the inspection apparatus 1 can be used even when only white areas with different brightness values exist or when only black areas with different brightness values exist. It can be determined how the illuminance around the inspection object 100 is within the specified illuminance range.

  For this reason, when there are at least two white areas having different brightness values, the arithmetic processing unit 20 includes the first brightness value of the first white area (first achromatic area) and the second white area (second The absolute value of the brightness difference Db between the second brightness value of the achromatic color area) and the first reference brightness value of the first white area and the second reference brightness value of the second white area are calculated. The absolute value of the reference brightness difference Dbb is calculated. And in this arithmetic processing unit 20, when the lightness difference Db is smaller than the reference lightness difference Dbb, the illuminance around the inspection object 100 is higher than the specified illuminance range, and this illuminance is abnormal. The notification information may be output from the notification device 40. In addition, when there are at least two black areas having different brightness values, the arithmetic processing unit 20 includes the first brightness value of the first black area (first achromatic area) and the second black area (second no-color area). The absolute value of the lightness difference Db between the second lightness value of the chromatic region) and the first reference lightness value of the first black region and the second reference lightness value of the second black region are calculated. The absolute value of the reference brightness difference Dbb is calculated. And in this arithmetic processing unit 20, when the brightness difference Db is smaller than the reference brightness difference Dbb, the illuminance around the inspection object 100 is lower than the specified illuminance range, and the illuminance is abnormal. The notification information may be output from the notification device 40.

  As described above, in the inspection apparatus 1 (illuminance monitoring apparatus) of the present embodiment, at least two achromatic regions having different brightness values exist on the captured image, and the first achromatic region and the second achromatic color are present. If the brightness difference between the areas is smaller than the reference brightness difference between the first achromatic color area and the second achromatic color area, an abnormality has occurred in the illuminance around the inspection object 100 The notification information is output from the notification device 40. For this reason, this inspection apparatus 1 (illuminance monitoring apparatus) urges the worker who has obtained the notification information to check or replace the illumination, and the illuminance around the inspection object 100 falls within the specified illuminance range. It can be returned. Therefore, since this inspection apparatus 1 can obtain a correct inspection result, the inspection accuracy can be improved. In addition, the illuminance monitoring device can cause the inspection device 1 to output a correct inspection result and improve inspection accuracy.

[Modification]
Here, in the present embodiment described above, the illuminance monitoring device is incorporated in the inspection device 1. However, the illuminance monitoring device can be configured as a single unit, that is, as a device obtained by removing the inspection function from the inspection device 1. Reference numeral 2 shown in parentheses in FIG. 1 represents the illuminance monitoring apparatus of the present modification.

  The illuminance monitoring device 2 monitors the illuminance around the imaging object 100 based on the imaging device 10 that images the imaging object 100 and the captured image information for each pixel obtained from the imaging information of the imaging device 10. And an informing device 40 for informing information based on a command from the arithmetic processing device 20.

  The imaging object 100 is, for example, equivalent to the inspection object 100 of the inspection apparatus 1 described above. The arithmetic processing device 20 of the present modification corresponds to the arithmetic processing device 20 of the inspection device 1 described above except for the arithmetic processing function related to the inspection. The notification device 40 is equivalent to the notification device 40 of the inspection device 1 described above. For this reason, the configuration, arithmetic processing operation, and the like in the illuminance monitoring apparatus 2 are mainly referred to as the imaging object 100 in the description of the configuration, arithmetic processing operation, and the like related to the illuminance monitoring in the previous inspection apparatus 1. You can replace it.

  The specified illuminance or the specified illuminance range is determined as described above in the inspection apparatus 1 if the monitoring result of the illuminance monitoring apparatus 2 is used for the inspection of the inspection object 100 as in the embodiment. That's fine. On the other hand, when the monitoring result is used in an apparatus such as a device different from the inspection apparatus 1, the specified illuminance or the specified illuminance range may be determined in accordance with the illuminance setting in the apparatus.

  By configuring the illuminance monitoring device 2 of this modification in this way, the same effects as those described in the embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Inspection apparatus 2 Illuminance monitoring apparatus 10 Imaging apparatus 20 Arithmetic processing apparatus 21 Storage apparatus 30 Display apparatus 40 Notification apparatus 100 Inspection object (imaging object)

Claims (5)

An imaging device for imaging an inspection object;
An arithmetic processing device that inspects the inspection object according to the inspection item based on the captured image information for each pixel obtained from the imaging information of the imaging device;
An informing device for informing information based on a command of the arithmetic processing unit;
With
When there are at least two achromatic regions having different brightness values on the captured image of the imaging device, the arithmetic processing device may include a first brightness value in the first achromatic region and a second value in the second achromatic region. Calculating a brightness difference between brightness values, and calculating a reference brightness difference between a first reference brightness value in the first achromatic region and a second reference brightness value in the second achromatic region;
When the lightness difference is smaller than the reference lightness difference, the arithmetic processing device causes the notification device to output notification information that an abnormality has occurred in illuminance around the inspection object. Inspection device.   In the case where the first achromatic region is a white achromatic region and the second achromatic region is a gray achromatic region, the arithmetic processing unit may perform the inspection if the lightness difference is smaller than the reference lightness difference. The inspection apparatus according to claim 1, wherein notification information that an illuminance around the object is higher than a specified illuminance range and an abnormality has occurred in the illuminance is output from the notification apparatus.   In the case where the first achromatic region is a gray achromatic region and the second achromatic region is a black achromatic region, the arithmetic processing unit may perform the inspection if the lightness difference is smaller than the reference lightness difference. The inspection apparatus according to claim 1, wherein notification information that an illuminance around the object is lower than a specified illuminance range and abnormality is generated in the illuminance is output from the notification apparatus.   The inspection apparatus according to claim 1, wherein the imaging apparatus includes a CCD image sensor or a CMOS image sensor as an imaging element. An imaging device for imaging an imaging object;
An arithmetic processing device that monitors the illuminance around the imaging object based on the captured image information for each pixel obtained from the imaging information of the imaging device;
An informing device for informing information based on a command of the arithmetic processing unit;
With
When there are at least two achromatic regions having different brightness values on the captured image of the imaging device, the arithmetic processing device may include a first brightness value in the first achromatic region and a second value in the second achromatic region. Calculating a brightness difference between brightness values, and calculating a reference brightness difference between a first reference brightness value in the first achromatic region and a second reference brightness value in the second achromatic region;
The arithmetic processing device, when the lightness difference is smaller than the reference lightness difference, causes the notification device to output notification information that an abnormality has occurred in illuminance around the imaging object. Illuminance monitoring device.

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