JP2007093340A - Apparatus and method for coating inspection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus capable of surely making workmen visually recognize the groups of very small flaws which are produced, when coatings are repaired and of objectively determining the quality of coatings, without having to depend on sensory properties of workmen. <P>SOLUTION: The coating inspection apparatus 8 is provided with an illumination means 11 for irradiating light to a section Fa to be inspected of a coated surface F; an imaging means 12 for imaging a light reflected at the surface of the section Fa to be inspected; an image processing means 21 for processing images at reception of signals from the imaging means 12; a displacement detection means 13A for detecting the distance between the surface of the section Fa to be inspected and the imaging means 12; a perpendicularity determination means 13B for detecting the perpendicularity between the surface of the section Fa to be inspected and the optical axis of the imaging means 12; and a determination means 13 for determining whether the distance and the angle between the imaging means 12 and the surface of the section Fa to be inspected are in an inspectable state at reception of signals from the displacement detection means 13A and the perpendicularity determination means 13B. Ultrasonic displacement sensors are adopted as the displacement detection means 13A and the perpendicularity determination means 13B, and enable simultaneous detection of the distance and the perpendicularity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for visually judging the quality of painting.

  Conventionally, in the painting of a vehicle body, a method of repairing a defective portion due to dust or dust contamination by polishing a small amount of the defective portion has been adopted. In the above repair work, a fine flaw group may be generated at the repair site by polishing the painted surface. This micro-scratch group is usually polished to such an extent that it cannot be visually observed by repair, but it is generated secondary by the fact that the size of the scratch is not reduced to an invisible level depending on the degree of polishing. It becomes poor painting. Secondary coating defects due to such repairs of repaired parts are determined by visual inspection by an operator.

As described above, secondary coating defects that occur in the repaired area of the coating, that is, the minute scratches that remain slightly visible, are difficult to see under illumination (fluorescent lamps) on the coating line. However, even if it is not visible in the repair process, when it is placed in direct sunlight on a sunny day as a product, a group of micro-scratches may become apparent and paint defects may become apparent.
In addition, detection of secondary coating defects occurring at the repaired part of the coating, that is, the group of minute scratches that remain slightly visible, is performed based on the operator's visual inspection. It was difficult to set an objective criterion for the degree of secondary painting failure due to repair.

  On the other hand, a method for inspecting the quality of a transparent coating film of an ultraviolet absorber that protects the surface of a product from ultraviolet rays contained in sunlight is conventionally known. Since the transparent coating film cannot be visually recognized as it is, there is an apparatus for visually discriminating as shown below.

For example, in Patent Document 1, ultraviolet light is irradiated to a member on which a coating film of an ultraviolet absorbing transparent coating is formed, and the brightness of the reflected light is observed using an ultraviolet camera, and the brightness of the reflected light is determined. An apparatus for measuring the quality of painting has been released.
JP 2003-47907 A

  As described above, secondary coating defects due to micro-scratches occurring at the repaired part of the coating are determined based on the operator's sensuality. There is a need for an apparatus that can be used and that can objectively determine the quality of painting without relying on the operator's sensuality.

  Therefore, in the present invention, by applying the technique for detecting a coating defect caused by ultraviolet irradiation described in the above-mentioned patent document, an operator can reliably prevent secondary coating defects caused by a group of minute scratches generated by the repair of the coating. A device that can be visually recognized and that can objectively determine the quality of painting without depending on the sensuality of the operator is proposed.

Further, in realizing the above-mentioned device, there are scattered portions of temporary coating defects due to dust or contamination of the dust, so that the device is portable or movable in order to be able to move the device to the repaired portion of the coating failure. It is preferable to have the property.
However, as described in the above-mentioned patent document, in order to determine the quality of the coating based on the brightness of the reflected light, the distance between the inspection part that reflects the light and the part of the device that receives the reflected light. And the angle must be kept in a suitable state. However, when an operator supports the apparatus and inspects the coating, it is difficult to adjust the relative positional relationship between the inspection site and the apparatus depending on the visual observation of the operator. Therefore, when the apparatus is portable or movable, a mechanism for maintaining the distance and angle between the reflecting surface (inspection part) that reflects light and the part of the apparatus that receives the reflected light substantially constant. It is necessary to prepare.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, an illuminating unit that irradiates light to an inspection site on a painted surface, an imaging unit that images reflected light of the light irradiated from the illuminating unit to the inspection site, and a signal from the imaging unit Receiving the image processing means for performing imaging processing, a displacement detecting means for detecting a distance between the surface of the examination site and the imaging means, and a surface of the examination site and the optical axis of the imaging means are in a predetermined vertical direction. The distance and angle between the surface of the examination region and the imaging means can be inspected by receiving a signal from the verticality judgment means for judging whether it is within the range of degrees, and the displacement detection means and the perpendicularity judgment means A determination unit for determining whether the state is present, and an output unit for outputting a determination result of the determination unit.

  According to a second aspect of the present invention, the coating inspection apparatus further includes a display output unit that displays and outputs a processing result of the image processing unit, and the image processing unit is an electrical signal of reflected light imaged by the imaging unit. Is processed as an image, and the image is processed so that the brightness of the reflected light is indicated by gradation or color tone, and this processed image is displayed and output by the display output means.

  According to a third aspect of the present invention, in addition to the imaging process, the image processing unit compares the luminance of the reflected light imaged by the imaging unit with a preset reference value of luminance to determine whether there is a coating defect. The process to judge is performed.

  According to a fourth aspect of the present invention, the displacement detection unit is an ultrasonic displacement sensor, and the verticality determination unit is configured to detect the surface of the examination site based on the presence or absence of a detection signal from the ultrasonic displacement sensor to the determination unit. And the optical axis of the image pickup means are determined to be within a predetermined perpendicularity range.

  According to a fifth aspect of the present invention, the light emitted from the illumination unit is an ultraviolet ray, and the imaging unit includes at least an ultraviolet lens and an ultraviolet imaging unit.

  According to a sixth aspect of the present invention, a coating inspection apparatus including at least an illumination unit, an imaging unit, and an image processing unit is used. The reflected light of the reflected light is imaged, the electrical signal of the reflected light captured by the imaging means is acquired as an image by the image processing means, and the brightness of the reflected light is indicated by gradation or color tone. This is a coating inspection method in which image processing is performed to inspect secondary coating defects due to minute scratches that occur at the repaired portion of the coating.

  According to a seventh aspect of the present invention, in the paint inspection apparatus, the illumination unit and the imaging unit are integrally configured, further including a displacement detection unit and a perpendicularity determination unit, and detected by the displacement detection unit. Based on the distance between the examination site and the imaging unit, and the determination result whether the surface of the examination site and the optical axis of the imaging unit are within a predetermined vertical range in the verticality determination unit, The reflected light of the light irradiated by the imaging means is imaged after adjusting the distance and angle between the surface of the examination site and the imaging means to be inspectable.

  The displacement detection means may be an ultrasonic displacement sensor, and the perpendicularity determination means may detect the surface of the examination site according to the presence or absence of a detection signal from the ultrasonic displacement sensor to the determination means. And the optical axis of the image pickup means are determined to be within a predetermined perpendicularity range.

  As effects of the present invention, the following effects can be obtained.

According to the first aspect, the coating inspection apparatus can make it possible to visually recognize the fine scratches generated at the repaired portion of the coating even in the room, and the quality of the repairing of the coating can be judged more clearly.
The displacement detection means detects the distance (displacement) between the examination site and the imaging means, and the verticality judgment means detects that the examination site and the imaging means are at a predetermined verticality, and the imaging means and the examination It is possible to adjust the focal length and the perpendicularity with the part with high accuracy.
Further, since the displacement detection means and the perpendicularity determination means are provided, at least the imaging means of the coating inspection apparatus can be moved, and the imaging means is moved so as to image a desired inspection site, and the inspection is performed. Can be easily and reliably performed.

  According to the second aspect of the present invention, it is possible to make the micro-scratches generated in the repaired portion of the coating more clearly visible even in the room with the coating inspection apparatus, and it is possible to judge whether the coating repair is good or bad.

  In claim 3, it is possible to objectively determine the quality of the painting without depending on the sensuality of the operator.

  According to the fourth aspect of the present invention, when a predetermined displacement (focal length) is detected by the ultrasonic displacement sensor, the verticality can be automatically ensured, and therefore the detection sent from the ultrasonic displacement sensor to the determination means. The distance between the examination region and the imaging means can be detected and the verticality can be secured by the signal, the number of members can be reduced, and the apparatus can be simplified.

  According to the fifth aspect, by using ultraviolet light having a short light wavelength as a light source, it is possible to make the reflected light more easily visible compared to the case of visible light.

  According to the sixth aspect of the present invention, it is possible to visually recognize the fine scratches generated in the repaired portion of the paint even in the room with the paint inspection apparatus, and the quality of the repair of the paint can be judged more clearly.

  According to a seventh aspect of the present invention, the displacement detection means detects the distance (displacement) between the examination site and the imaging means, and the verticality determination means detects that the examination site and the imaging means are at a predetermined verticality. Thus, it is possible to adjust the focal length and the perpendicularity between the imaging means and the examination site with high accuracy. And since the operator can easily recognize whether the displacement and the perpendicularity are appropriate, the imaging means can be easily set to an appropriate posture, and the inspection can be performed easily and reliably. Can do.

  According to the eighth aspect of the present invention, when the displacement (focal length) of a predetermined value is detected by the acoustic displacement sensor, the verticality can be automatically secured, so that a detection signal sent from the ultrasonic displacement sensor to the determination means is used. It is possible to detect the distance between the examination site and the imaging means and to ensure the verticality, to reduce the number of members, and to make the apparatus simpler.

Next, embodiments of the invention will be described.
1 is a block diagram showing the overall configuration of a coating inspection apparatus according to an embodiment of the present invention, FIG. 2 is a front view of a detection unit of the coating inspection apparatus, and FIG. 3 is a rear view of the detection unit of the coating inspection apparatus. is there. FIG. 4 is a side view of the detection unit of the coating inspection apparatus. FIG. 5 is a cross-sectional plan view of the detection unit of the coating inspection apparatus.

First, the structure of the coating inspection apparatus according to the present invention will be described.
The coating inspection apparatus 8 is for inspecting the presence or absence of a coating defect due to the minute flaw group by making the minute flaw group generated by polishing the painted surface F more easily visible. As shown in FIG. 1, the coating inspection apparatus 8 includes a detection unit 9 and an image processing unit 10.

As shown in FIG. 5, the detection unit 9 irradiates the inspection portion of the coating surface F with light and receives the reflected light. The detection unit 9 is moved to a position where the inspection site can be inspected.
The light applied to the inspection site on the painted surface F is reflected by contact with the surface of the inspection site Fa. However, since there are minute flaw groups on the surface of the inspection site Fa, the reflected light becomes scattered light. . The detection unit 9 receives this scattered light and images it.

  The image processing unit 10 captures the reflected light (scattered light) imaged by the detection unit 9 as an image, and performs image processing on the image so that the minute flaws on the surface of the examination site Fa can be easily seen. Is output, and the quality of the coating of the examination site Fa is determined based on the displayed and output image.

First, the configuration of the detection unit 9 will be described.
As shown in FIGS. 1 to 5, the detection unit 9 includes illumination means 11, imaging means 12, determination means 13, displacement detection means 13 </ b> A, verticality determination means 13 </ b> B, marking means 14, The output means 15 and the remote control means 19 are integrally provided on the frame 17.

  The frame 17 is formed in a box shape that opens toward the examination site Fa. 1 will be described as a front view of the detection unit 9 (hereinafter the same), the frame 17 has a box shape in which the front of the detection unit 9 is opened.

The detection unit 9 is provided with a handle 17 a on the back surface of the frame 17 in order to facilitate movement by an operator or a work robot. One side of the handle 17a is directly fixed to the frame 17, and the other side is fixed to the frame 17 via a stay 17b. An operator or a work robot can hold the handle 17 a to support the detection unit 9 and operate the detection unit 9.
When operating the detection unit 9 by the work robot, the position information of the inspection part Fa of the painting surface F is given to the work robot in advance, and the work robot is moved so as to move the detection part 9 to the inspection part Fa. Can be controlled.

  The remote control means 19 is provided in the vicinity of the handle 17 a of the frame 17. The remote operation unit 19 is an input unit to the image processing unit 10 for operating the image processing unit 10 from a position away from the operator who operates the detection unit 9. By providing the remote control means 19, it is possible to display an image on the image processing unit 10 arranged at a distant position and perform display conversion processing of the image while operating the detection unit 9. Become.

  The illuminating means 11 is for irradiating the examination site Fa with light, and is provided inside a box-shaped frame 17. In addition, it is preferable to determine these relative positions so that the linear distance which connects the light source of the illumination means 11 and the surface of the test | inspection site | part Fa becomes 300 mm or more.

  In the illuminating unit 11 according to the present embodiment, light sources are arranged symmetrically via an imaging unit 12 described later, and are arranged so as to illuminate the examination site Fa from both sides across the imaging unit 12. Thereby, even when the painted surface is a curved surface such as a vehicle body, a state in which light is not easily reflected directly from the light source of the illumination unit 11 is formed on the imaging unit 12.

The light emitted from the illumination means 11 can be visible light, but is preferably ultraviolet light.
The intensity of the reflected light on the surface of the examination site Fa is larger when the wavelength of the light is shorter, and the intensity of the reflected light is larger in the case of ultraviolet light having a shorter wavelength than visible light. Therefore, in order to make the reflected light more easily visible, it is desirable that the light emitted from the illumination unit 11 is ultraviolet light.
For this reason, in this embodiment, a black light that emits ultraviolet rays is employed as the illumination means 11.

The imaging means 12 is for receiving and imaging light emitted from the illumination means 11 and reflected by the surface of the examination site Fa. The image pickup means 12 is disposed at a substantially central portion of the front surface of the frame 17.
A black plate 18 is disposed around the imaging unit 12 in front of the coating inspection apparatus 8 so that light other than the reflected light is not captured by the imaging unit 12. Thereby, in the imaging means 12, the illumination means 11 emits light and can receive light only indirectly through the surface of the examination site Fa. Further, the black plate 18 prevents a blooming phenomenon that occurs when the imaging unit 12 directly takes in the light emitted from the illumination unit 11.

  The imaging means 12 includes a lens that receives reflected light and an imaging unit that converts the received optical image into an electrical signal. In the imaging means 12, the light emitted from the illumination means 11 is incident on the surface of the examination site Fa and reflected, and is received through the lens and imaged by the imaging unit. For example, a camera is employed as the imaging unit 12.

  In this embodiment, since the illumination unit 11 employs a black light that emits ultraviolet rays, the lens included in the imaging unit 12 is an ultraviolet light lens that receives ultraviolet rays, and is also included in the imaging unit 12. A so-called ultraviolet camera in which the imaging unit is an ultraviolet CCD having sensitivity only in the ultraviolet region is employed.

By the way, in the said coating inspection apparatus 8, since the repair location of a coating surface is not necessarily the same site | part, at least imaging is performed among the coating inspection apparatuses 8 so that the reflected light of the surface of the desired test site | part Fa can be imaged. The part (detector 9) including the means 12 is configured to be movable.
However, if the detection unit 9 can be moved, the distance and relative angle between the imaging unit 12 and the surface of the examination site Fa change, so that the surface of the examination site Fa deviates from the focal length of the imaging unit 12 or the imaging unit. The angle between the 12 optical axes and the surface of the inspection site Fa varies, which causes the following problems.

Reflected light when the imaging unit 12 captures the reflected light on the surface of the examination site Fa in a state where the distance between the imaging unit 12 and the surface of the examination site Fa deviates from the focal length of the imaging unit 12. The luminance is different from the luminance of the reflected light when imaging is performed in a state where the distance between the imaging unit 12 and the surface of the examination site Fa matches the focal length of the imaging unit 12. Further, if the distance between the imaging means 12 and the surface of the inspection site Fa is different for each inspection, the brightness of the reflected light will be different even with the same degree of damage.
Further, when the optical axis of the imaging means 12 and the surface of the inspection site Fa on the painting surface F are arranged substantially perpendicularly, the optical axis of the imaging means 12 and the surface of the inspection site Fa are not arranged substantially perpendicularly. In some cases, the brightness of the reflected light to be imaged differs, so if the angle between the optical axis of the imaging means 12 and the surface of the inspection site Fa of the painted surface F changes from inspection to inspection, there is a similar scratch. As a result, a difference occurs in the brightness of the reflected light.
As described above, even if the scratches are of the same level, if the brightness is different, it is difficult to determine the level of the micro-scratch group based on the brightness.
Further, in order to determine whether or not the optical axis of the imaging means 12 is perpendicular to the surface of the examination site Fa, it is necessary to take a measure such as judging by looking at the captured image itself, and experience and proficiency level There is a problem that the accuracy of the inspection differs depending on the situation.

Therefore, in order to eliminate the above problem, the detection unit 9 detects that the distance between the imaging unit 12 and the surface of the examination site Fa is a predetermined distance, and also detects the optical axis of the imaging unit 12 and the examination site Fa. Means (displacement detecting means 13A, perpendicularity determining means 13B) for detecting that the surface of the surface is substantially perpendicular are provided.
Thus, at least the imaging means 12 is configured to be movable among the components of the coating inspection apparatus 8, and the degree of damage of the inspection site Fa is evaluated based on the brightness of the reflected light imaged by the imaging means 12. Can be easily performed with high reliability.

  The displacement detection means 13A is for detecting the distance (displacement) between the imaging means 12 and the surface of the examination site Fa. The displacement detection means 13A is provided in the vicinity of the imaging means 12 so that a value closer to the actual distance between the imaging means 12 and the surface of the examination site Fa can be detected. The displacement detection means 13A can use various non-contact type displacement sensors such as eddy current type, optical type, ultrasonic type, laser force type, and laser type. A contact type displacement sensor such as a ruler can also be used.

  Further, the perpendicularity determination means 13B has a perpendicularity between the optical axis of the imaging means 12 (the optical axis of the lens provided in the imaging means 12) and the surface of the inspection site Fa of the painted surface F within a predetermined range. It is for acquiring information for determining whether or not. As the verticality determination means 13B, various non-contact type verticality detection sensors such as an optical type, an ultrasonic type, a laser force type, and a laser type can be used. A contact type displacement sensor such as a ruler can also be used.

  The determination unit 13 is electrically connected to the displacement detection unit 13A, the verticality determination unit 13B, and the output unit 15, and receives detection signals from the displacement detection unit 13A and the verticality determination unit 13B. The calculation processing is performed, and the calculation result is displayed on the output means 15.

  The determination unit 13 receives the detection signal from the displacement detection unit 13A, and acquires the distance between the sensor head 13a and the surface of the inspection site Fa as a substitute value for the distance between the imaging unit 12 and the surface of the inspection site Fa. Then, by comparing the detected distance value with a preset reference value of the distance, it is determined whether or not the distance is within the allowable range. If the distance is within the allowable range, the inspection region and the imaging means 12 are determined. It is determined that the mutual positional relationship with can be inspected. That is, it is determined whether or not the focal length of the imaging unit 12 matches the surface of the examination site Fa.

  In addition, the determination unit 13 receives the information acquired by the verticality determination unit 13B, determines whether the verticality between the surface of the examination site Fa and the optical axis of the imaging unit 12 is within a predetermined range, If it is within the allowable range, it is determined that the inspection is possible. That is, it is determined whether the optical axis of the imaging means 12 is substantially perpendicular to the surface of the examination site Fa that is not completely flat.

  In the present embodiment, as the displacement detection means 13A and the verticality determination means 13B, one ultrasonic displacement sensor is provided in the detection unit 9, thereby reducing the cost of the coating inspection apparatus 8 and simplifying the apparatus configuration. We are trying to make it. The ultrasonic displacement sensor as the displacement detection means 13A and the perpendicularity determination means 13B is close to the imaging means 12, and the traveling direction of the detection signal (ultrasonic wave) emitted from the ultrasonic displacement sensor; It arrange | positions so that the optical axis of the said imaging means 12 may become substantially parallel.

  The ultrasonic displacement sensor transmits ultrasonic waves from the sensor head and receives ultrasonic waves reflected by the inspection site by the sensor head, but the transmitted ultrasonic waves are substantially perpendicular to the painted surface serving as the inspection site. If it is not incident, the ultrasonic wave cannot be received by the same sensor head, that is, the displacement is not output unless a certain degree of verticality is secured between the sensor head and the examination site. .

  Therefore, the detection unit 9 employs the characteristics of the ultrasonic displacement sensor described above as the verticality determination unit 13B, and employs an ultrasonic displacement sensor as the displacement detection unit 13A (or the verticality determination unit 13B). Thus, it is detected that the distance between the imaging unit 12 and the surface of the examination site Fa is a predetermined distance, and at the same time, it is detected that the optical axis of the imaging unit 12 and the surface of the examination site Fa are in a substantially vertical state. To be able to

.
That is, by detecting that a detection signal (ultrasonic wave) emitted from the sensor head 13a of the displacement detection unit 13A is incident on the surface of the examination site Fa, the optical axis and the painted surface of the lens provided in the imaging unit 12 are detected. It is detected that the surface of the inspection site Fa in FIG. Further, the displacement detection means 13A is disposed in the vicinity of the sensor head 13a by detecting the displacement between the sensor head 13a of the displacement detection means 13A and the surface of the examination site Fa as an original function as a displacement sensor. The displacement between the imaging means 12 and the surface of the examination site Fa is detected in a pseudo manner.
Therefore, as in the present embodiment, when one ultrasonic displacement sensor is provided as the displacement detection means 13A and the perpendicularity determination means 13B, the perpendicularity between the imaging means 12 and the surface of the examination site Fa is secured. Otherwise, since no detection signal is output, the determination unit 13 determines that the perpendicularity between the imaging unit 12 and the surface of the examination site Fa is within a preset allowable value based on the presence or absence of an output signal from the ultrasonic displacement sensor. It will be judged whether it is.

The marking means 14 is for marking the range or one point of the surface of the examination site Fa imaged by the imaging unit 12 so that the site to be imaged can be visually recognized by an operator.
In the present embodiment, a laser pointer that emits visible light is provided as the marking means 14, and the laser head 14 a of the marking means 14 that emits visible light is in the vicinity of the imaging means 12 and detects displacement via the imaging means 12. It is provided on the side opposite to the means 13A.

  The output means 15 is a small monitor attached to the back side of the frame 17 via a support member 16 as shown in FIG. 3 or FIG. With this support member 16, the output means 15 can be attached to and detached from the frame 17 and the angle can be changed, and the operator can adjust the position and angle of the output means 15 so that they can be easily seen. The output means 15 is separated from the detection unit 9 to be a large monitor. When the detection unit 9 is suspended, the output unit 15 is visually recognized by an operator such as a hanging tool of the detection unit 9. It can be provided in a place where it is easy to do.

As described above, the determination result of the determination unit 13 is output from the output unit 15. However, when the output unit 15 is a monitor as in this embodiment, the reflected light imaged by the imaging unit 12 is used. It is also possible to further provide an image processing means for acquiring the electrical signal as an image and outputting the image, and to output the image picked up by the image pickup means 12 as an image by the output means 15.
The operator looks at the information shown in the output means 15 and confirms that the distance and perpendicularity between the imaging means 12 and the surface of the examination site Fa are within an allowable range (inspectable range). be able to. In addition, the operator looks at the information shown in the output unit 15 and sets the detection unit 9 so that the distance and perpendicularity between the imaging unit 12 and the surface of the inspection site Fa are within an allowable range (inspectable range). Inspection can be performed by adjusting the position and orientation of the imaging means 12 provided.

  However, the output means 15 is not limited to a display output means such as a monitor, and whether or not the distance and angle between the imaging means 12 and the surface of the examination site Fa, which are the determination results of the determination means 13, are in a state where inspection is possible. Can also be notified to the operator by sound or light.

Moreover, the above-mentioned detection part 9 can also be arrange | positioned in the place which performs inspection work in the state supported with the hanging tool which can be rotated and displaced.
In this case, the operator grasps the handle 17a of the frame 17 and moves the detection unit 9, but the operator easily operates the detection unit 9 because the load of the detection unit 9 is carried by the hanging tool. can do. In addition, since the hanging tool can rotate the detection unit 9, the degree of freedom of light source arrangement with respect to the surface of the examination site Fa is increased, and the light source of the illumination unit 11 is prevented from being reflected in the imaging unit 12. be able to.

  Next, the configuration of the image processing unit 10 will be described.

  As shown in FIG. 1, the image processing unit 10 includes an image processing unit 21 and a display output unit 22. The image processing unit 21 of the image processing unit 10 performs processing of information on the reflected light imaged by the imaging unit 12 and processing for outputting and displaying these processing results by the display output unit 22.

The image processing unit 21 has an image capturing function for acquiring an electrical signal of reflected light captured by the imaging unit 12 included in the detection unit 9 as an image. The image capturing function is realized by, for example, a capture board provided in the image processing unit 21.
Further, the image processing means 21 has an image processing function for processing the acquired image so that the minute flaw group is easily visible. In image processing, an image is processed so that the brightness of reflected light is indicated by gradation or color tone.
Further, the image processing means 21 has a display output function for causing the display output means 22 to display the image processing result on the display output means 22.

  By executing the function of the image processing unit 21, for example, the image processing unit 21 receives the electrical signal of the reflected light imaged by the imaging unit 12 of the detection unit 9 and outputs the processed image. The means 22 can immediately display black and white gradation (grayscale display). In this case, the group of minute flaws present on the surface of the examination site Fa is displayed in an intermediate color (gray), and the closer to white, the higher the brightness of the reflected light and the deeper the flaw.

Further, by executing the function of the image processing unit 21, for example, the image processing unit 21 receives an image processed by receiving an electrical signal of reflected light imaged by the imaging unit 12 of the detection unit 9, The display output means 22 can immediately display a pseudo color. In this case, display is performed for each color based on the brightness of the reflected light, and the pseudo color display scale can be arbitrarily set for each evaluation standard, and the scale can be set for each vehicle type and paint color.
By displaying the image of the surface of the examination site Fa in a pseudo color display, it is possible to make the included minute wound group stand out more easily and make the minute wound group easily visible.

  In the image output and displayed on the display output means 22 as described above, the brightness of the reflected light is indicated by gradation or color tone, and the degree (depth) of the minute wound group included on the surface of the examination site Fa is indicated. . Therefore, the worker can visually recognize the degree of the minute flaw group based on the gradation or color tone and determine whether the coating is good or bad. Therefore, the use of the coating inspection apparatus 8 makes it possible to visually recognize minute flaws occurring at the repaired portion of the coating even in the room, and the quality of the coating repair can be more clearly determined.

In addition, the image processing means 21 has a judgment function for judging the presence or absence of painting failure by comparing the reference value of luminance set and registered in advance with the reflected light obtained from the image, and when the painting is defective. Has a display output function for causing the display output means 22 to display and output that the paint is defective.
Accordingly, it is possible to objectively determine the presence or absence of coating failure from the degree of the minute flaw group included on the surface of the inspection site Fa without relying only on the sensuality of the operator.

  Note that the image displayed and output on the display output unit 22 as described above can be stored as still image information in a memory or a storage medium by the image processing unit 21. This still image information can be given to the vehicle as vehicle information, for example, and used as information constituting the traceability of the vehicle.

The block diagram which showed the whole structure of the coating inspection apparatus which concerns on the Example of this invention. The front view of the detection part of a coating inspection apparatus. The rear view of the detection part of a coating inspection apparatus. The side view of the detection part of a coating inspection apparatus. Plan sectional drawing of the detection part of a coating inspection apparatus.

Explanation of symbols

F coating surface Fa inspection site 8 coating inspection apparatus 9 detection unit 10 image processing unit 11 illumination unit 12 imaging unit 13 determination unit 13A displacement detection unit 13B perpendicularity determination unit 14 labeling unit 15 output unit 17 frame 18 black plate 21 image processing unit 22 Display output means

Claims (8)

An illumination means for irradiating the inspection area of the painted surface with light;
Imaging means for imaging reflected light of the light emitted from the illumination means to the examination site;
Image processing means for receiving a signal from the imaging means and performing an imaging process;
Displacement detecting means for detecting a distance between the surface of the examination site and the imaging means;
Verticality determination means for determining whether the surface of the examination site and the optical axis of the imaging means are within a predetermined verticality range;
A determination unit that receives signals from the displacement detection unit and the verticality determination unit, and determines whether a distance and an angle between the surface of the inspection site and the imaging unit are in an inspectable state;
Output means for outputting a determination result of the determination means,
Paint inspection device. The coating inspection apparatus further includes display output means for displaying and outputting a processing result by the image processing means,
The image processing means acquires an electrical signal of reflected light imaged by the imaging means as an image, and performs image processing on the image so that the brightness of the reflected light is indicated by gradation or color tone. The processed image is displayed and output by the display output means,
The coating inspection apparatus according to claim 1. In addition to the imaging process, the image processing means includes:
By comparing the brightness of the reflected light imaged by the imaging means with a preset reference value of the brightness, a process for determining the presence or absence of coating failure is performed,
The coating inspection apparatus according to claim 1 or 2. The displacement detection means is an ultrasonic displacement sensor,
The verticality determination means determines whether the surface of the examination site and the optical axis of the imaging means are within a predetermined verticality range based on the presence or absence of a detection signal from the ultrasonic displacement sensor to the determination means. It is characterized by
The coating inspection apparatus in any one of Claims 1-3. The light emitted by the illumination means is ultraviolet light,
The imaging means comprises at least an ultraviolet lens and an ultraviolet imaging unit,
The coating inspection apparatus in any one of Claims 1-4. Using a coating inspection apparatus comprising at least illumination means, imaging means, and image processing means,
Irradiate the inspection area of the painted surface with the illumination means,
Capture reflected light of the light irradiated by the imaging means,
An electrical signal of reflected light imaged by the imaging means is acquired as an image by the image processing means, and the image is processed so that the brightness of the reflected light is indicated by gradation or color tone,
A coating inspection method characterized by inspecting secondary coating defects due to minute flaws that occur in the repaired area of the coating. In the coating inspection apparatus, the illumination unit and the imaging unit are integrally configured, and further includes a displacement detection unit and a perpendicularity determination unit,
A distance between the examination site detected by the displacement detection unit and the imaging unit;
Based on the determination result whether the surface of the examination site and the optical axis of the imaging unit are within a predetermined verticality range in the verticality determination unit,
After adjusting the distance and angle between the surface of the inspection site and the imaging means to be inspectable,
The reflected light of the light irradiated by the imaging means is imaged,
The coating inspection method according to claim 6. The displacement detection means is an ultrasonic displacement sensor,
The verticality determination means determines whether the surface of the examination site and the optical axis of the imaging means are within a predetermined verticality range based on the presence or absence of a detection signal from the ultrasonic displacement sensor to the determination means. It is characterized by
The coating inspection method according to claim 7.

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