JP6574402B2 - Image inspection apparatus, image inspection method, and image inspection program - Google Patents

Description

  The present invention mainly relates to an image inspection apparatus that performs an inspection using an image obtained by photographing a wire harness.

  A wire harness used for an automobile or the like is configured by binding a plurality of wiring bodies such as electric wires with an adhesive tape or the like. In the middle of the wire harness, a fixture for attaching the wire harness to the vehicle side, an exterior material for protecting the wire harness, and the like are provided.

  As a method for inspecting whether or not the wire harness is correctly manufactured based on the appearance, a technique for inspecting by image processing using a computer has been proposed. This type of visual inspection apparatus is disclosed in Patent Documents 1 and 2, for example.

  In the appearance inspection apparatus for a wire harness disclosed in Patent Document 1, a region to be inspected of the wire harness is imaged by an imaging unit. Then, the appearance inspection apparatus extracts, for example, an area of a predetermined color from the photographed image, and whether or not the correct color adhesive tape is wound depending on whether or not the area of the area exceeds the minimum area. Is configured to determine.

  The appearance inspection device disclosed in Patent Document 2 is configured to perform an appearance inspection of a wire harness by performing image processing based on an image obtained by photographing the wire harness with a camera. The image data acquired by the camera is sequentially processed by the detection processing means, and the processed data is compared with the reference data stored in advance, so that a defect such as a missing component of the wire harness is generated. Presence or absence is detected.

International Publication No. 2007/144986 JP 7-103732 A

  By the way, the exterior material (for example, a tube etc.) attached to a wire harness is often black. Also, the adhesive tape for fixing the exterior material to the wiring body is often black. Therefore, it may be necessary to inspect whether or not the black adhesive tape is wound on the black exterior material.

  However, when the color of the exterior material and the adhesive tape are very similar as described above, it is difficult to simply determine whether or not the adhesive tape is wound by the color, resulting in a decrease in inspection accuracy.

  Moreover, when the process of winding and fixing an adhesive tape is performed manually, the shape of the wound adhesive tape is difficult to be constant. For this reason, if the presence or absence of an adhesive tape is determined only from the shape of the adhesive tape, an erroneous determination is likely to occur.

  Further, even when an incorrect exterior material is attached to the wiring body or the attachment of the exterior material is leaked, the problem portion may be hidden by winding an adhesive tape on the exterior material. In this case, it has been difficult for the conventional appearance inspection apparatus to stably detect defects, and there is room for improvement.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wire harness appearance inspection apparatus that stably detects an adhesive tape wound around a wire harness and improves inspection accuracy. It is in.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, an image inspection apparatus having the following configuration is provided. That is, this image inspection apparatus inspects whether or not the adhesive tape is wound on a wire harness including a wiring body, an exterior material, and an adhesive tape. The exterior material is attached to the wiring body. The adhesive tape is wound around at least the exterior material. The image inspection apparatus includes an imaging unit and an inspection unit. The imaging unit images the wire harness. The inspection unit inspects whether or not the adhesive tape is wound by detecting wrinkles generated on the wound adhesive tape from the image obtained by the photographing unit.

  Thereby, for example, even when the color of the adhesive tape is confusing with the surroundings, the inspection can be performed with high accuracy by detecting wrinkles generated on the adhesive tape. Further, it is possible to inspect whether or not the assembly of the exterior material covered with the adhesive tape is correct by utilizing the fact that the adhesive tape ridge reflects the shape of the inner exterior material to some extent.

  In the image inspection apparatus, it is preferable that the inspection unit can inspect whether or not an adhesive tape having the same or similar color as the exterior material is wound around the exterior material.

  That is, the image inspection apparatus of the present invention is particularly advantageous when the colors of the exterior material and the adhesive tape are the same or similar.

  In the said image inspection apparatus, it is preferable that the said test | inspection part can test | inspect whether the black adhesive tape is wound around the said black exterior material.

  That is, the image inspection apparatus of the present invention is particularly advantageous when both the exterior material and the adhesive tape are black.

  In the image inspection apparatus, the inspection unit may detect, from the image, a bright region that is a region where pixels brighter than a predetermined value are continuous, and detect the wrinkles based on the shape of the bright region. preferable.

  Thereby, the highlight part based on the curl of an adhesive tape appears as a bright area, The said wrinkle can be detected appropriately using the specific tendency in the shape of this bright area.

  In the image inspection apparatus, before the inspection unit detects the bright area from the image, a process of drawing a line that divides the wire harness in the longitudinal direction is performed by pixels darker than the predetermined value. It is preferable.

  Thereby, a bright area | region can be detected in the form forcibly divided in the longitudinal direction of the wire harness. Therefore, even if the image is disturbed, the highlight portion based on the curl of the adhesive tape can be stably detected as a bright region.

  In the image inspection apparatus, before the inspection unit detects the bright region from the image, a process of detecting a contour line of a dark region that is a region where pixels darker than the predetermined value are continuous, and It is preferable that a process of drawing the contour line is performed with pixels darker than a predetermined value.

  As a result, the bright area can be detected in a form in which the inside and outside of the outline of the dark area are divided. Therefore, the highlight part based on the curl of the adhesive tape can be detected stably.

  In the above-described image inspection apparatus, it is preferable that a process of removing the dark region chip is performed before the contour line is detected.

  As a result, it is possible to eliminate the lack of the dark region, and thus it is possible to obtain a contour line that substantially reflects the shape of the adhesive tape or the like. Therefore, even if the image is disturbed, highlights based on the curl of the adhesive tape can be appropriately obtained as a bright region.

  The image inspection apparatus preferably has the following configuration. That is, the inspection unit detects a dark region, which is a region where pixels darker than the predetermined value are continuous, from the image. The inspection unit detects the bright region from a portion substantially surrounded by one or a plurality of the dark regions selected in order of increasing area in the image.

  Thereby, the highlight based on the curl of the adhesive tape can be appropriately obtained as the bright region by detecting the bright region substantially surrounded by the dark region having a large area.

  According to the second aspect of the present invention, the following image inspection method is provided. That is, this image inspection method inspects whether or not the adhesive tape is wound on a wire harness including a wiring body, an exterior material, and an adhesive tape. The exterior material is attached to the wiring body. The adhesive tape is wound around at least the exterior material. This image inspection method includes an imaging process and an inspection process. In the photographing step, the wire harness is photographed. In the inspection step, whether or not the adhesive tape is wound is inspected by detecting wrinkles generated on the wound adhesive tape from the image obtained in the photographing step.

  Thereby, for example, even when the color of the adhesive tape is confusing with the surroundings, the inspection can be performed with high accuracy by detecting wrinkles generated on the adhesive tape. Further, it is possible to inspect whether or not the assembly of the exterior material covered with the adhesive tape is correct by utilizing the fact that the adhesive tape ridge reflects the shape of the inner exterior material to some extent.

  According to the third aspect of the present invention, an image inspection program having the following configuration is provided. That is, this image inspection program inspects whether or not the adhesive tape is wound on a wire harness including a wiring body, an exterior material, and an adhesive tape. The exterior material is attached to the wiring body. The adhesive tape is wound around at least the exterior material. This image inspection program includes an imaging step and an inspection step. In the photographing step, the wire harness is photographed. In the inspection step, whether or not the adhesive tape is wound is inspected by detecting wrinkles generated on the wound adhesive tape from the image obtained in the photographing step.

  Thereby, for example, even when the color of the adhesive tape is confusing with the surroundings, the inspection can be performed with high accuracy by detecting wrinkles generated on the adhesive tape. Further, it is possible to inspect whether or not the assembly of the exterior material covered with the adhesive tape is correct by utilizing the fact that the adhesive tape ridge reflects the shape of the inner exterior material to some extent.

The schematic diagram and block diagram which show the structure of the external appearance inspection apparatus which concerns on one Embodiment of this invention. The figure which shows the 1st example of the image which image | photographed the test | inspection site | part with the camera. The figure which shows the result of having binarized the image of FIG. The figure which shows a mode that the white area | region of the shape which satisfy | fills predetermined conditions is detected in the binary image. The figure which shows the 2nd example of the image which image | photographed the test | inspection site | part with the camera. The figure which shows the result of having binarized the image of FIG. The figure which shows a mode that the dividing line was drawn with the black pixel with respect to the image of FIG. The figure which shows the 3rd example of the image which image | photographed the test | inspection site | part with the camera. The figure which shows the result of having binarized the image of FIG. The figure which shows a mode that the black area | region was detected from FIG. 9, and it removed except the black area | region with the largest area. The figure which shows a mode that the expansion process and the shrinkage | contraction process were performed with respect to the black area | region of FIG. The figure which shows the outline detected from the image of FIG. The figure which shows a mode that the outline of FIG. 12 was drawn with the black pixel with respect to the image of FIG.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram and a block diagram showing a configuration of an appearance inspection apparatus 1 according to an embodiment of the present invention.

  An appearance inspection apparatus (image inspection apparatus) 1 according to this embodiment shown in FIG. 1 is an apparatus that inspects whether or not the wire harness 5 manufactured in the wire harness assembly line 2 has been assembled correctly.

  In the wire harness assembly line 2, the assembly drawing board 3 for assembling the wire harness 5 is configured to be transported through an appropriate path by a transport conveyor (not shown).

  Here, the wire harness 5 to be inspected will be briefly described. The wire harness 5 is a wiring member that is assembled along a wiring path set in a vehicle in order to electrically connect a plurality of electric devices installed in a machine (a vehicle such as an automobile in the present embodiment). It is. The wire harness 5 is configured by being bound with an adhesive tape or the like in a state where a wiring body such as an electric wire is appropriately branched. Although the wire harness 5 is simply illustrated in FIG. 1, a fixing member for fixing to the vehicle is attached to an appropriate part of the wire harness 5. A connector for electrical connection to an electrical device is attached to the end of the wire harness 5. In addition to the above-described adhesive tape, fixing member, and connector, exterior materials such as a tube, a sheet, and a bellows tube are attached to the wire harness 5 as necessary.

  The wire harness 5 is manufactured on the above-described assembly drawing board 3 by an operator's manual work. Specifically, a plurality of harness holding members 6 capable of holding the wire harness 5 and its semi-finished product are fixed to the assembly drawing board 3 in a protruding shape. The shape of the distal end portion of the harness holding member 6 is various. For example, the harness holding member 6 is a substantially U-shaped wire support portion, a connector holding portion, or a fixing member can be fitted and held. Can be mentioned. An operator assembles the wire harness 5 by attaching a connector or the like while holding the electric wire on the harness holding member 6 attached to the assembly drawing board 3.

  The appearance inspection apparatus 1 of the present embodiment is configured to inspect each of a plurality of inspection target parts set in advance for the wire harness 5 described above. Specific inspection items include whether there is no fixing leak due to the adhesive tape or component mounting leakage, or whether a wrong component is attached.

  As shown in FIG. 1, the appearance inspection apparatus 1 includes a camera (photographing unit) 12, a light source 13 for photographing, and a computer (control unit) 30. The camera 12 and the light source 13 are electrically connected to the computer 30.

  The camera 12 is arranged so as to face the assembly drawing board 3 conveyed along the line, and the wire harness 5 held on the assembly drawing board 3 is not changed during or after the assembly of the wire harness 5. Take a picture. In FIG. 1, the camera 12 is shown alone, but a plurality of cameras 12 may be installed as necessary.

  The light source 13 is configured to illuminate the wire harness 5 photographed by the camera 12.

  The appearance inspection apparatus 1 includes a computer 30 as a control unit that controls the camera 12, the light source 13, and the like. The computer 30 includes a setting unit 31, a storage unit 32, an inspection unit 35, and an inspection result output unit 37.

  Specifically, the computer 30 includes a CPU, a ROM, a RAM, and the like (not shown). The CPU corresponds to a calculation unit or an image processing unit. The ROM stores in advance an image inspection program for performing a photographing step, an inspection step, and the like in the wire harness image inspection method of the present invention. The image inspection program includes an imaging step and an inspection step corresponding to the image inspection method.

  With this configuration, the above hardware and software cooperate to cause the computer 30 to operate as the setting unit 31, the storage unit 32, the inspection unit 35, the inspection result output unit 37, and the like illustrated in FIG. Can do. The computer 30 controls the camera 12 to shoot the wire harness 5 while illuminating with the light source 13, stores the obtained image in the storage unit 32, and inspects the result by the inspection unit 35. The result output unit 37 is configured to output.

  Next, the configuration of the computer 30 will be described in detail.

  The setting unit 31 receives settings such as items related to the inspection via a mouse and a keyboard (not shown) connected to the computer 30. Items related to the inspection include, but are not limited to, which part of the wire harness 5 is to be inspected.

  The storage unit 32 can store various information such as items set by the setting unit 31, image data acquired from the camera 12, and inspection results by the inspection unit 35.

  The inspection unit 35 analyzes each image data stored in the storage unit 32 to inspect each of the inspection target portions set in the wire harness 5. The inspection result is output to the inspection result output unit 37.

  The inspection result output unit 37 outputs the inspection result by the inspection unit 35 to a display (not shown) connected to the computer 30 in the form of “OK” or “NG”, for example.

  Next, a description will be given of a method in which the inspection unit 35 inspects a portion where an adhesive tape having a color similar to the exterior material is wound around the exterior material.

  In the inspection part 35 of this embodiment, the presence or absence of the said adhesive tape is determined from the wrinkle which appears when the adhesive tape is wound around the exterior of the exterior material.

  That is, when the pressure-sensitive adhesive tape is wound around the exterior material, curled wrinkles (small irregularities) appear on the surface of the pressure-sensitive adhesive tape, and this curl shows a characteristic shape that reflects the outer shape of the exterior material to some extent.

  When this curl is exposed to light, a bright portion appears mainly at a relatively convex portion. Therefore, if the adhesive tape is correctly wound around the inspection target region, a bright pixel region (closed region) surrounded by dark pixels in an image captured by the camera 12 while applying light from the light source 13 to the inspection target region. ) Will appear.

  Hereinafter, the image inspection method will be described in detail using three examples of images obtained by photographing the wire harness 5.

  FIG. 2 (first example) is an image taken by the camera 12 of a portion of the wire harness 5 in which a black adhesive tape is wound around and fixed to a midway portion of a black soft exterior material formed in a bellows tubular shape. In the drawings of the present application, the photograph is shown in gray scale for convenience of formatting, but color photography is actually performed. Thus, it can be seen that highlights appear on the convex portion of the curl in the portion where the adhesive tape is wound.

  FIG. 3 is an image obtained by binarizing the image of FIG. 2 with an appropriate threshold. In FIG. 3, pixels brighter than the threshold are white and pixels darker than the threshold are black. By this processing, the highlight of the part wound with the adhesive tape appears as a region where white pixels are continuously arranged in the vertical or horizontal direction. In the following description, an area where white pixels are continuous may be referred to as a “white area”. This white area corresponds to an area (bright area) in which pixels brighter than the above threshold value continue in the original image (FIG. 2). Detection of a white area from a binarized image can be performed by, for example, a labeling process that is a well-known method.

  In the example of FIG. 3, many white areas appear in the longitudinal direction of the wire harness 5 in the portion where the adhesive tape is wound. Further, most of the white region has an elongated shape, and the longitudinal direction thereof is directed in a direction substantially perpendicular to the longitudinal direction of the wire harness 5. Such a shape of the white region is attributed to the fact that the exterior material has a bellows shape.

  In other words, if a white region having the characteristic shape as described above appears in the binarized image of the inspection target part, the adhesive tape is wound, otherwise the adhesive tape is wound. It can be determined that it is not.

  However, the white region is not only the highlight of the adhesive tape curl described above, but also due to, for example, uneven highlights and patterns formed on the exterior material (the part where the adhesive tape is not wound). Arise. Considering this, the inspection unit 35 determines whether or not the detected white area satisfies a predetermined shape condition. As the conditions for the shape of the white region, the size in the vertical direction, the size in the horizontal direction, the aspect ratio, the area, the ratio of the area of the rectangle circumscribing the region to the area of the region, and the like can be considered.

  In FIG. 4, a white region that satisfies a predetermined shape condition is highlighted and surrounded by a rectangle. According to FIG. 4, it is understood that although the false detection is not zero, the highlight based on the curl of the adhesive tape can be detected almost well.

  The inspection unit 35 detects a white area having the above-described characteristic shape from the binarized image, and passes if the detected number (or the total area of the detected white areas) is equal to or greater than a predetermined threshold. If it is less than the threshold value, it is determined as rejected. Thereby, even if the color of an exterior material and an adhesive tape is almost the same, it can be determined appropriately whether the adhesive tape is wound correctly.

  As described above, when the adhesive tape is wound around the exterior of the exterior material, the outer shape of the exterior material is reflected to some extent in the shape of the curl. Therefore, even if the adhesive tape is correctly wound around the part, if the assembly of the exterior material around which the adhesive tape is wound is wrong, the characteristic of the curl that should originally appear will not appear. Thus, according to the appearance inspection apparatus 1 of this embodiment, even if the exterior material is covered with the adhesive tape and hidden, the assembly error of the exterior material can be detected.

  Although it is useful to inspect the wire harness based on the curl of the adhesive tape as described above, the curl is generated irregularly, so that the curl may occur at the end of the adhesive tape. In this case, the curl of the adhesive tape is assimilated with the background of the wire harness in the photographed image, which causes a decrease in the accuracy of determining the curl shape. Hereinafter, the countermeasure will be described.

  FIG. 5 (second example) is a grayscale image obtained by photographing the portion of the wire harness 5 in which the adhesive tape is wound around and fixed to a tube-shaped hard exterior material having a flat portion. In the image of FIG. 5, a large area highlight appears when light hits the adhesive tape wound around the flat portion of the exterior material.

  FIG. 6 is a binarized version of the image of FIG. 5. In FIG. 6, although the large area highlight appears as a white pixel region (reference numeral 8 a), the white pixel region is It connects with the white pixel (code | symbol 8c) of the background of a wire harness through the white pixel of the curl shown by the code | symbol 8b in FIG. In this case, since both the highlight and the background are included in a region where white pixels are continuous, the shape cannot be correctly determined.

  Therefore, in the present embodiment, before the white area is detected by the labeling process, a process of drawing a straight line (partition line) of black pixels in a direction perpendicular to the longitudinal direction of the wire harness 5 as shown in FIG. Do. Since the white pixel region is forcibly divided by this correction processing, it can be expected that the white region based on the highlight can be correctly detected. FIG. 7 shows a detected white region that satisfies a predetermined shape condition in a highlighted shape surrounded by a rectangle.

  In addition, as a method of correcting so as to divide the white pixel region, a part of the outline of the wire harness 5 is substantially extracted instead of or in addition to drawing a straight line as described above. It is also effective to draw the contour with black pixels. This example will be described below.

  FIG. 8 (third example) is a grayscale image obtained by photographing the portion of the wire harness 5 in which the black adhesive tape is wound around and fixed to the end portion of the black soft exterior material formed in the bellows tubular shape. .

  The result of binarizing the image of FIG. 8 with a predetermined threshold is shown in FIG. 9, and in this example, the highlight part of the adhesive tape indicated by reference numeral 8d passes through the white pixel indicated by reference numeral 8e to the wire. It is connected to a white pixel (portion 8f) on the background of the harness.

  In the third example, the inspection unit 35 first detects a region where black pixels are continuous instead of white. In the following description, an area where black pixels are continuous may be referred to as a “black area”. This black region corresponds to a region (dark region) in which pixels darker than the above threshold value continue in the original image (FIG. 8). As a method for detecting a black area from a binarized image, a well-known labeling process or the like can be used as in the case of a white area.

  After detecting all the black areas, the inspection unit 35 performs a process of leaving the black area having the maximum area and erasing all other black areas. As a result, as shown in FIG. 10, only the portion corresponding to the black exterior material and the black adhesive tape can be extracted with the background noise and the like removed. However, there may be a case where the black area is excessively erased and a good outline cannot be obtained at the time of detecting the outline described later. Therefore, a plurality of black areas may be left in descending order of area. Further, for example, both black regions may be left only when the area ratio between the black region having the largest area and the black region having the second largest area satisfies a predetermined condition.

  Next, after inspecting the image of FIG. 10 temporarily, the inspection unit 35 performs image processing for expanding the black region and then contracting the copied image. The black region expansion process is a process of setting a target pixel to black if at least one of eight pixels (so-called eight neighboring pixels) adjacent to the target pixel obliquely vertically and horizontally is black. This is done for pixels. The black region contraction process is a process in which, when at least one of the eight pixels that are diagonally adjacent to the pixel of interest is white, the pixel of interest is whitened for all the pixels.

  After repeating the expansion process of the black area an appropriate number of times, the contraction process is repeated the same number of times, thereby removing white pixels corresponding to the reference numeral 8e in FIG. 9 (that is, missing black areas) as shown in FIG. An image can be obtained.

  Thereafter, the inspection unit 35 extracts a contour as shown in FIG. 12 by performing a known contour detection process on the image of FIG. In addition, since the black region chip has been removed in advance, a good outline can be obtained. And the test | inspection part 35 draws the outline obtained in FIG. 12 with black with respect to the original binary image shown in FIG. In the resulting image (FIG. 13), the portion 8d shown in FIG. 9 is detected as a white area in a form separated from the portion 8f, and whether or not highlighting due to curl has occurred. This can be appropriately determined based on the shape of the white region.

  As described above, the appearance inspection apparatus 1 according to the present embodiment inspects whether or not the adhesive tape is wound on the wire harness 5 including the electric wire, the exterior material, and the adhesive tape. The exterior material is attached to the electric wire. The adhesive tape is wound around at least the exterior material. The appearance inspection apparatus 1 includes a camera 12 and an inspection unit 35. The camera 12 images the wire harness 5. The inspection unit 35 inspects whether or not the adhesive tape is wound by detecting wrinkles generated on the wound adhesive tape from the image obtained by the camera 12.

  Thereby, for example, even when the color of the adhesive tape is confusing with the surroundings, the inspection can be performed with high accuracy by detecting wrinkles generated on the adhesive tape. Further, it is possible to inspect whether or not the assembly of the exterior material covered with the adhesive tape is correct by utilizing the fact that the wrinkles of the adhesive tape reflect the shape of the inner exterior material to some extent.

  Further, in the appearance inspection apparatus 1 of the present embodiment, the inspection unit 35 can inspect whether or not an adhesive tape having the same or similar color as the exterior material is wound around the exterior material.

  That is, the appearance inspection apparatus 1 of this embodiment is particularly advantageous when the colors of the exterior material and the adhesive tape are the same or similar.

  Moreover, in the external appearance inspection apparatus 1 of this embodiment, the test | inspection part 35 can test | inspect whether the black adhesive tape is wound around the black exterior material.

  That is, the appearance inspection apparatus 1 according to the present embodiment is particularly advantageous when the exterior material and the adhesive tape are both black.

  Further, in the appearance inspection apparatus 1 according to the present embodiment, the inspection unit 35 binarizes the image to detect a white area, and detects the wrinkles based on the shape of the white area.

  Thereby, the highlight part based on the curl of the adhesive tape appears as a white area after binarization, and the fact that the shape of the white area has a specific tendency can be used to appropriately detect the wrinkle. it can.

  Further, in the appearance inspection apparatus 1 according to the present embodiment, before the inspection unit 35 detects a white area from the image, a process of drawing a line that divides the wire harness 5 in the longitudinal direction is performed by the black pixels.

  Thereby, the white region can be detected in a form that is forcibly divided in the longitudinal direction of the wire harness 5. Therefore, even if the image is disturbed (for example, a white pixel as indicated by reference numeral 8b in FIGS. 6 and 7), the highlight portion based on the curl of the adhesive tape can be stably detected as a white region. .

  Further, in the appearance inspection apparatus 1 according to the present embodiment, before the inspection unit 35 detects a white area from the image, the process of detecting the outline of the black area, and the outline is drawn with black pixels on the image. Processing is performed.

  Thereby, a white area | region can be detected in the form which divided | segmented the inside and outside of the outline of a black area | region. Therefore, the highlight part based on the curl of the adhesive tape can be detected stably.

  In addition, in the appearance inspection apparatus 1 of the present embodiment, a process of removing black area defects (specifically, a combination of an expansion process and a contraction process) is performed before detecting the outline of the black area.

  As a result, the black area can be eliminated, and a contour line that substantially reflects the shape of the adhesive tape or the like can be obtained. Therefore, even if the image is disturbed (for example, a white pixel as indicated by reference numeral 8e in FIG. 9), highlights based on curl can be appropriately obtained as a white region.

  Further, in the appearance inspection apparatus 1 of the present embodiment, the inspection unit 35 binarizes the image and detects a black region. In the image, the inspection unit 35 detects a white region from a portion substantially surrounded by one or a plurality of black regions having the largest area (portion surrounded by the contour in FIG. 12).

  Thereby, the highlight based on the curl of the adhesive tape can be appropriately obtained as the white region by detecting the white region substantially surrounded by the black region having a large area.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  The color of the exterior material and the adhesive tape of the wire harness 5 inspected by the appearance inspection apparatus 1 is not limited to the above, and may be arbitrarily determined. For example, in the case of a high-voltage wire harness, both the exterior material and the adhesive tape may be orange, but such an example is naturally included.

  In addition to the inspection other than whether the adhesive tape is wound, the appearance inspection apparatus 1 may perform other inspections (for example, whether a connector is attached) or the like.

  For example, brightness may be used as the brightness reference for binarizing the image, but brightness may be used instead. For example, the luminance value of a specific color when the pixel color is expressed in RGB may be used as a reference. Furthermore, an area in which pixels brighter than the threshold continue (bright area) and an area in which pixels darker than the threshold continue (dark area) may be detected without binarizing the image.

  In the above embodiment, the dividing line is drawn as shown in FIG. 7 in the case of a hard case, and the contour is drawn as shown in FIG. 12 in the case of a soft case. Different methods are used depending on the exterior material. However, both the process of drawing the dividing line as shown in FIG. 7 and the process of drawing the contour line of FIG. 12 may be performed.

  The process of removing the black region chip may be only the expansion process instead of the combination of the expansion process and the contraction process.

1 Visual inspection device (image inspection device)
5 Wire harness 12 Camera (shooting unit)
35 Inspection Department

Claims (10)

A wiring body;
An exterior material attached to the wiring body;
At least an adhesive tape wound around the exterior material;
An image inspection apparatus for inspecting whether or not the adhesive tape is wound on a wire harness comprising:
An imaging unit for imaging the wire harness;
From the image obtained by the photographing unit, an inspection unit that inspects whether or not the adhesive tape is wound by detecting wrinkles generated on the wound adhesive tape,
An image inspection apparatus comprising: The image inspection apparatus according to claim 1,
The image inspection apparatus, wherein the inspection unit can inspect whether or not an adhesive tape having the same or similar color as the exterior material is wound around the exterior material. The image inspection apparatus according to claim 2,
The image inspection apparatus, wherein the inspection unit can inspect whether or not a black adhesive tape is wound around the black exterior material. The image inspection apparatus according to any one of claims 1 to 3,
The image inspection apparatus, wherein the inspection unit detects, from the image, a bright region that is a region where pixels brighter than a predetermined value are continuous, and detects the wrinkles based on a shape of the bright region. The image inspection apparatus according to claim 4,
An image inspection apparatus in which a process for drawing a line dividing the wire harness in a longitudinal direction is performed by pixels darker than the predetermined value before the inspection unit detects the bright area from the image. . The image inspection apparatus according to claim 4 or 5,
Before the inspection unit detects the bright region from the image, a process of detecting a contour line of a dark region, which is a region where pixels darker than the predetermined value are continuous, and the pixels darker than the predetermined value An image inspection apparatus characterized in that a process of drawing an outline is performed. The image inspection apparatus according to claim 6,
The image inspection apparatus according to claim 1, wherein a process for removing the lack of the dark region is performed before detecting the contour line. The image inspection apparatus according to any one of claims 4 to 7,
The inspection unit detects, from the image, a dark region that is a region in which pixels darker than the predetermined value are continuous,
The said inspection part detects the said bright area | region from the part substantially enclosed by the one or some said dark area selected in the order of the area in the said image, The image inspection apparatus characterized by the above-mentioned. A wiring body;
An exterior material attached to the wiring body;
At least an adhesive tape wound around the exterior material;
An image inspection method for inspecting whether or not the adhesive tape is wound,
A photographing step of photographing the wire harness;
From the image obtained in the photographing step, an inspection step for inspecting whether or not the adhesive tape is wound by detecting wrinkles occurring on the wound adhesive tape;
An image inspection method comprising: A wiring body;
An exterior material attached to the wiring body;
At least an adhesive tape wound around the exterior material;
An image inspection program for inspecting whether or not the adhesive tape is wound on a wire harness comprising:
A photographing step of photographing the wire harness;
From the image obtained in the photographing step, an inspection step for inspecting whether or not the adhesive tape is wound by detecting wrinkles generated on the wound adhesive tape;
An image inspection program comprising: