JP5858524B2 - Method for detecting the paint color of cosmetics - Google Patents

Description

  The present invention relates to a method for detecting a paint color of a decorative material on which joints are formed.

  In the case of architectural decorative materials such as brick-like and masonry-like exterior materials, there are known ones provided with joints extending linearly in the vertical and horizontal directions. The joint is provided in a recessed manner, and a raised portion other than the joint serves as a convex portion to form the surface shape of the decorative material.

  In such a decorative material, the joints are generally substantially the same color, and the pattern of the decorative material is formed by painting the convex portions by painting. In the determination of the quality of the coating of the decorative material, the conveyed decorative material is photographed with a camera, the color of the entire surface of the decorative material is detected, and color discrimination processing such as color averaging is performed. .

JP 2010-092415 A

  In detecting the color of the decorative material, there are many color variations particularly in the decorative material such as the exterior material, and there are cases where it is necessary to inspect the paint colors of multi-colored varieties. At that time, in the conventional method, since the base color constituting the joint color and the paint color of the pattern top constituting the color of the convex portion are measured together, it is difficult to measure and discriminate the accurate hue. It was. On the other hand, a process of registering the base color as data in the detection system in advance and subtracting it from the measured data is also conceivable. However, in this method, if the registered base color is different from the actual paint color in color, there is a possibility that a difference occurs between the subtracted data and the actual base color area, and accurate detection may not be possible. In addition, if there is a portion of a color close to the base color in the pattern provided on the convex portion, the base color of the convex portion may be subtracted, and there is a possibility that accurate detection cannot be performed.

  Also, in the area to be captured by the camera, specify the area where the base color joints will be placed in advance, and exclude the area from the whole, or specify the area for color discrimination, and extract the area However, a method of discriminating the color of the extraction area is also conceivable. However, joints that are base colors are usually long and difficult to specify an area. Even if the joint area is specified, the joint of the decorative material conveyed to the place may not be arranged, and there is a possibility that the designated area and the actual joint position are misaligned. Similarly, when specifying an area for color discrimination, it is difficult to specify all the areas to be extracted accurately because the joints are elongated.

  Moreover, in the decorative material molded by the roll press, the position of the joint may be different even for the same type, and it is more difficult to determine the color of the decorative material having a different joint position. That is, if the position of the convex part is different for each decorative material and the pattern is shifted, the ratio between the base color of the joint and the paint color of the pattern top of the convex part changes for each decorative material, The position of the projections and depressions changes, and the measured color data is affected, and there is a high possibility that accurate detection cannot be performed. On the other hand, for example, a method of specifying a pattern position by using an image processing technique such as Patent Document 1 and measuring a color finely is conceivable. However, the process is complicated and suitable for line inspection to be detected while transporting. Absent.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a paint color detection method capable of easily and accurately determining the color of a decorative material.

In the method for detecting the paint color of a cosmetic material according to the present invention, the convex portion is formed on the surface of the base material by joints extending vertically and horizontally, and when detecting the paint color of the cosmetic material coated with the convex portion, A predetermined range of the cosmetic material is photographed with a camera, the cosmetic material is three-dimensionally measured, a region having a surface height equal to or lower than a threshold value is detected as a low region, and is set as a deletion region including joints. In this case, processed image data is created excluding the image data, and color discrimination processing is performed based on the processed image data.

In a preferred form of the paint color detection method of the decorative material, before Symbol decorative material are those deep recesses between the joint and the convex portion is provided, the threshold value of the surface height is, joint and the recess And at least one selected from the height between the concave portion and the surface of the convex portion.

In another form of the decorative material paint color detection method, a convex portion is formed on the surface of the base material by joints extending vertically and horizontally, and when detecting the paint color of the decorative material coated with the convex portion, The decorative material is a color region in which the convex portion is painted in a color different from the joint color, and a predetermined range of the decorative material is photographed by a camera and the same color continues in the width direction for a predetermined length or more in the photographing data. Is detected as a joint color area in the width direction and is set as a deletion area including the joint, and the processed shooting data is created by excluding the deletion area from the shooting data, and color discrimination processing is performed based on the processing shooting data It is characterized by that.
In a preferred form of the decorative material paint color detection method, in the creation of the processed photographing data, even if the photographing data including the region set as the joint color region is excluded every frame, the processed photographing data is generated. Good.
In these cases, further, sets the deletion region of the detection to the transport direction of the color area followed by a substantially same color in a predetermined length or longer in the conveying direction as joint color region in the transport direction in the imaging data, the processing shooting For the creation of data, it is preferable to create the processed photographing data by excluding the deletion area in the transport direction .

  In the method for detecting a paint color of a decorative material, the camera is preferably a line sensor camera whose shooting range includes the entire length in the width direction of the decorative material.

  According to the present invention, color discrimination can be performed easily and accurately, and the quality of the paint color of the decorative material can be easily and accurately detected.

It is the schematic which shows an example of embodiment of the coating color detection method of a decorative material. It is a perspective view which shows an example of a decorative material. (A) And (b) is a schematic sectional drawing explaining an example of embodiment of the coating color detection method of a cosmetics. (A) is schematic which shows an example of embodiment of the coating color detection method of a cosmetic material, (b) And (c) is explanatory drawing which shows an example of imaging | photography data. It is the schematic explaining an example of embodiment of the coating color detection method of a decorative material. It is the schematic explaining an example of the calibration in the paint color detection method, (a) shows the state at the time of color measurement, and (b) at the time of calibration.

[Embodiment 1]
FIG. 1 shows Embodiment 1 of a method for detecting a paint color of a decorative material.

  In this embodiment, the decorative material 1 is inspected as shown in FIG. 2 in which a plurality of convex portions 3 are formed on the surface of the base material by joints 2 extending vertically and horizontally. In this decorative material 1, the convex portion 3 may be painted with a color different from the joint color (color of the joint 2), or the convex portion 3 and the joint 2 may be painted with the same color. The decorative material 1 has a rectangular shape as a basic shape, and the joint 2 of the entire decorative material 1 is composed of the joint 2 parallel to the long side and the joint 2 parallel to the short side. In addition, the vertical and horizontal directions in which the joint 2 extends are two directions (longitudinal direction and short direction) parallel to the long side and the short side of the decorative material 1. As described above, the vertical and horizontal directions may be two vertical directions, and the horizontal direction may be considered as the longitudinal direction and the vertical direction as the short direction, or vice versa. Further, the width of the joint 2 in the longitudinal direction and the width of the joint 2 in the short method may be the same or different.

  The convex part 3 is colored by painting. The convex portion 3 may be painted with one color or may be painted with a plurality of colors. Moreover, in the decorative material 1, the one convex part 3 and the other convex part 3 may be painted with a different color. Moreover, the convex part 3 may be patterned. When the convex portion 3 is painted with a plurality of colors, a colorful design is applied to the decorative material 1.

  The convex portion 3 may be a flat surface or may be provided with fine irregularities. When fine unevenness is provided, a more natural design can be created, and a brick-like design or a stone-like design can be expressed.

  The joint 2 is preferably provided with substantially the same color throughout the decorative material 1. In that case, the joint 2 can be visually confirmed clearly, and the design is improved. Moreover, it is preferable that the joint 2 is a color different from the convex part 3 in order to improve the designability. The color of the joint 2 may be colored by painting, or the color of the substrate material of the decorative material 1 may be the color of the joint as it is. The color of the joint 2 may be a base color of the decorative material 1, and may be, for example, white, black, gray, or the like. The joint 2 is formed by recessing the decorative material 1, and has substantially the same depth throughout the decorative material 1.

  The decorative material 1 may be formed by a roll press. For example, the substrate material of the decorative material 1 is extruded by a roll press molding machine in which unevenness of the joint pattern is applied to the roll, and the extruded long molded product is cut to an appropriate length to obtain a flat surface. A rectangular molded product can be obtained visually. Then, the entire surface of the molded product including the joint 2 is coated with a base color, and further, the decorative material 1 as shown in FIG. 1 and FIG. Can be obtained. Note that the molded product may be cut after painting.

  Such a decorative material 1 is subjected to color detection of the paint color in order to confirm the quality of the paint.

  Conventionally, as described above, color detection is performed using the photographing data of the decorative material 1 as it is without being processed. However, in that case, the accuracy of color detection is impaired due to the presence of the joint 2, and the color detection method is complicated. Here, the joint 2 is a portion having a small area and a color defect that is not conspicuous when viewed from the entirety of the decorative material 1, and a portion that contributes little to the pattern and color of the wall when the wall is formed. . Therefore, in the present embodiment, paying attention to the fact that it is possible to determine whether the cosmetic material 1 is good or not by determining whether or not the paint color of the convex portion 3 is good, excluding the joint 2, the color of the cosmetic material 1 is detected. Is.

  In color detection, the cosmetic material 1 is aligned with one of the short side and the long side (the short side in FIG. 1) in the width direction of the transport device (the direction perpendicular to the transport direction). The other side (long side in FIG. 1) is transported in accordance with the transport direction. That is, the decorative material 1 is inspected while being conveyed on the line. Detection efficiency is increased by line inspection, and the productivity of the decorative material 1 can be improved. In addition, the color detection of one decorative material 1 becomes one work.

  Then, a predetermined range of the decorative material 1 is photographed by the camera 4 and a deletion area including the joint 2 is detected and set.

  In the present embodiment, the cosmetic material 1 that has been conveyed is three-dimensionally measured, and a region whose surface height is equal to or less than a threshold value is detected as a lower region 20 and set as a deletion region. This surface height is position information in the vertical direction (thickness direction of the decorative material 1) at each position on the surface of the decorative material 1. Accordingly, the surface height can be expressed as a height or depth from the reference. For example, the surface height can be expressed by a height from the back surface of the decorative material 1, a depth from the surface of the convex portion 3 of the decorative material 1, or the like. And the threshold value of surface height can be made into the height (or depth) between the surface of the convex part 3 of the cosmetic material 1 and the surface of the joint 2. When the threshold value is set in this way, the region whose surface height is equal to or less than the threshold value is a region including the joint 2 and the joint 2 is set as the deletion region. The three-dimensional measurement may be performed upstream of the line before shooting by the camera 4 or may be performed downstream of the line after shooting. When three-dimensional measurement is performed before shooting by the camera 4, color discrimination can be performed immediately after shooting by the camera 4. Further, if the camera 4 is photographed immediately after the three-dimensional measurement, it becomes easy to match the position information in both data. FIG. 1 shows a state in which the camera 4 performs photographing after performing three-dimensional measurement.

  The three-dimensional measurement can be performed by, for example, the 3D camera 11 (three-dimensional measurement imaging device). By using the 3D camera 11, the surface height at each two-dimensional position (each position on the surface of the decorative material 1) can be accurately measured at high speed. In the three-dimensional measurement, for example, the laser light L is emitted from the laser irradiation device 12 directly above the decorative material 1 to be conveyed, and the irradiated portion is imaged by the 3D camera 11. By irradiating the decorative material 1 with the laser light L and capturing the reflected light of the laser light L with the 3D camera 11, the accuracy of the three-dimensional measurement is increased. The laser light L may be line-shaped light that extends in the width direction of the decorative material 1. If the 3D camera 11 is picked up from an oblique direction (for example, a range of 30 ° or more and less than 90 °), the detection accuracy of the surface height increases. At this time, it is preferable that the photographing range (frame range) of the 3D camera 11 of the decorative material 1 includes the entire length of the decorative material 1 in the width direction. When the entire length in the width direction of the decorative material 1 is photographed by one photographing process, the decorative material 1 can be photographed across the width direction with one frame without moving the lens of the 3D camera 11 in the width direction. Processing efficiency.

  Data captured by the 3D camera 11 is sent to an appropriate arithmetic processing device 8 (3D arithmetic processing device 8a) configured by a personal computer or the like via a connection cable 9 or the like. This data is continuously stored in the 3D data storage unit 13 such as a memory as 3D data including height information at each two-dimensional position. In the 3D data, the 3D arithmetic processing device 8a detects a low height area (area) whose surface height is equal to or lower than the threshold as the low level area 20. At this time, as described above, the low-order region 20 includes the joint 2.

  The 3D data in which the lower region 20 is detected as described above is sent to the arithmetic processing device 8 (color detection arithmetic processing device 8b) that performs color detection via the connection cable 9 or the like, and the lower region 20 is deleted. And used for the subsequent processing. In this embodiment, an example in which the 3D arithmetic processing device 8a and the color detection arithmetic processing device 8b are configured using different arithmetic processing devices 8 is shown. However, the 3D processing and the color detection processing are performed as one unit. You may carry out with the arithmetic processing apparatus 8. FIG. Further, the detection of the lower region 20 may be performed by the color detection arithmetic processing device 8b. For example, the 3D data stored in the 3D data storage unit 13 of the 3D processing unit 8a is sent to the color detection processing unit 8b, and the surface height is sent from the sent 3D data by the color detection processing unit 8b. May be detected as the low-order region 20. At this time, the low level area 20 includes the joint 2 and the low level area 20 is set as the deletion area.

  On the other hand, in the decorative material 1 further conveyed, a predetermined range of the decorative material 1 is photographed by the camera 4 after the three-dimensional measurement. At this time, it is preferable that the photographing range 6 (frame range) of the camera 4 that is a predetermined range of the decorative material 1 includes the entire length of the decorative material 1 in the width direction. When the entire length in the width direction of the decorative material 1 is photographed by one photographing process, the decorative material 1 can be photographed in the width direction with one frame without moving the lens of the camera 4 in the width direction. , Processing efficiency is increased.

  In FIG. 1, the shooting range 6 shot by the camera 4 is a line area that is linear in the width direction. That is, the camera 4 is a line sensor camera in which the shooting range 6 is a line in the width direction. If such a line sensor camera is used, the entire width direction of the decorative material 1 conveyed can be efficiently captured and color-detected without moving the lens of the camera 4. That is, by using the line sensor camera, it is possible to capture the entire width direction in one frame, so it is possible to process the captured data within one frame, and it is easy to detect the joint 2 and exclude it. In addition, since linear shooting data can be obtained continuously, it is easier to process shooting data than a camera having a shooting range of another shape such as a circle. Note that an area camera that captures a plurality of frames in the width direction may be used as the camera 4. In this case, however, data processing may be complicated.

  When photographing with the camera 4, it is preferable to illuminate the photographing range 6 with the light P by an illumination tool 7 such as line illumination. The color of the surface of the decorative material 1 becomes clear by the light P, and the color detection performance can be improved.

  Shooting data shot by the camera 4 is continuously stored in the shooting data storage unit 15 of the color detection arithmetic processing device 8b constituted by a personal computer or the like via the connection cable 9 or the like. At this time, the photographing data in the width direction is continuously accumulated in the color detection arithmetic processing unit 8b, and the planar photographing data is recorded by accumulating the photographing data in the transport direction. Then, the photographing data is processed by the color detection arithmetic processing unit 8b. The photographing data before processing may be the same as the photographing data 5 shown in FIGS. 4B and 4C described later.

  In the processing of the shooting data, the deletion area set as described above is excluded from the shooting data. Exclusion of the deletion area may be performed sequentially for each shooting data (one frame) obtained in the width direction, or may be performed using planar shooting data formed by accumulating the shooting data in the width direction. Good. In the case of performing the exclusion process with planar imaging data, the entire surface of the decorative material 1 may be processed, or the surface may be divided into predetermined areas and processed for each part.

  In this way, the processed image data is created by excluding the deleted area from the image data, and the color discrimination process is performed based on the obtained processed image data. The color discrimination process can be performed by performing a color averaging process on the color values of the processed shooting data. Then, the coating color can be inspected by comparing the color average with reference color data stored in advance in the color detection arithmetic processing unit 8b. For example, compared with the reference color, the color of the decorative material 1 (that is, the convex portion 3) subjected to the color discrimination processing is determined to be good if the color value is within a predetermined range and defective if the color value is outside the predetermined range. Can be determined. As the color value, for example, color differences such as L, a, and b, color coordinates, and the like can be used. The quality determination of the paint color may be performed on the color detection arithmetic processing unit 8b, or may be performed by an operator who looks at the color value output by the color detection arithmetic processing unit 8b.

  By the way, in order to perform the processing as described above, it is necessary to associate the two-dimensional position between the 3D data obtained by the three-dimensional measurement and the photographing data obtained by photographing with the camera 4. In the present embodiment, there are two speed measuring devices 14 a that measure the conveying speed of the cosmetic material 1 during three-dimensional measurement, and a speed measuring device 14 b that measures the conveying speed of the decorative material 1 when photographing with the camera 4. The speed measuring device 14 is used for this. That is, if two speed measuring devices 14 are used, after 3D measurement is performed, it can be understood how long the camera 4 of the 3D measurement portion is shot after, so the 3D measurement region and the camera were photographed. The area can be associated with the position, and the corresponding process can be easily performed. In order to perform processing smoothly, the speed measuring device 14 may be connected to the arithmetic processing device 8 (one or both for 3D and color detection). Note that the correspondence of the two-dimensional information between the 3D data and the photographing data is not limited to this method. For example, the correspondence may be made based on distance information from the end portions of the decorative material 1 in the conveyance direction and the width direction. Further, in order to simplify the handling process, the conveying speed of the decorative material 1 may be the same between the three-dimensional measurement and the photographing with the camera 4.

According to the paint color detection method for the decorative material 1 as described above, highly accurate color identification can be performed on the inspection line for measuring the color after the multi-color coating of the decorative material 1. Since the joint 2 of the decorative material 1 is usually recessed and has a depth, it is easy to recognize the joint 2 when the surface height is lower than the threshold value. Therefore, joint 2 can it to distinguish between projections 3 protruding at joints 2 and the surface and deep also easily be in any position of the workpiece. Then, by detecting the lower region 20 constituted by the joint 2 of the decorative material 1 and excluding it from the photographing data as a deletion region, the lower region 20 is provided on the convex portion 3 without being affected by the overall pattern of the decorative material 1. Color discrimination can be easily performed by focusing on the top of the handle. Further, in the method of detecting the joint 2 by three-dimensional measurement, it is possible to easily detect the joint 2 in the transport direction compared to the method of detecting the joint 2 by color information described later, and the color of the joint 2 is excluded. Can be easily performed, and color discrimination can be performed with high accuracy.

  Further, the above color detection method is particularly useful for the decorative material 1 produced by roll press molding. In such a decorative material 1, the position of the joint 2, particularly the position in the conveyance direction in the joint 2 in the width direction, may differ for each decorative material 1 (workpiece) depending on the cutting position of the molded product. However, in the above method, the position of the joint 2 is not set in advance, but an area having a low surface height is recognized as the joint 2 for each work. Therefore, the position of the joint 2 is accurately determined to determine the joint 2. The accurate color detection can be performed by excluding the part.

[Embodiment 2]
As Embodiment 2, the form using the thing provided with the recessed part 23 by the depth between the convex part 3 and the joint 2 as shown in FIG. In the second embodiment, the three-dimensional measurement and the photographing by the camera 4 are performed by the same method as in the first embodiment, and the lower region 20 including the joint 2 is detected and the deletion process is performed. As the above, a structure in which the concave portion 23 is provided on the convex portion 3 is used.

  The decorative material 1 has the same configuration as that shown in FIG. 2 except that the convex portion 3 is provided with one or a plurality of concave portions 23. With the recesses 23, a concavo-convex pattern on the convex portions 3 of the decorative material 1 can be formed. The recess 23 may be a groove or a dot. In the case of a groove, it may be a straight line, a curved line, a wavy line, an irregular line, or the like. In the case of a dot shape, it may be regularly arranged or irregularly arranged. Moreover, the some recessed part 23 from which magnitude | sizes differ may be formed. The concave portion 23 may be formed at the center of the convex portion 3 or may be formed at a boundary portion between the convex portion 3 and the joint 2. The depth of the recess 23 may be in the range of about 1/10 to 9/10 of the depth of the joint 2, but is not limited thereto. For example, a relatively shallow recess 23 having a depth of less than 1/3 or a relatively deep recess 23 having a depth of 1/3 or more can be used. When there are a plurality of recesses 23, each recess 23 may have a different depth or the same depth.

  In the case of the decorative material 1 having the recess 23, the lower region 20 can be made an area consisting only of the joint 2 by changing the setting of the threshold value of the surface height for detecting the lower region 20. It can also be made into the field which consists of joint 2 and crevice 23.

  That is, if the surface height threshold is set to the height H1 between the joint 2 and the recess 23 as shown in FIG. 3A, only the joint 2 is detected as the lower region 20. On the other hand, when the threshold value of the surface height is set to the height H2 between the concave portion 23 and the surface of the convex portion 3 as shown in FIG. 3B, the joint 2 and the concave portion 23 are detected as the low-order region 20. Then, similarly to the first embodiment, the arithmetic processing unit 8 sets the low-order area 20 as a deletion area in each case, thereby performing color discrimination processing based on the processed photographing data created by excluding the low-order area 20. It can be carried out. At this time, in FIG. 3A, since only the joint 2 can be excluded as a low area, the color including the concave-convex pattern of the convex portion 3 is obtained by performing color determination by excluding the color of only the joint 2. This makes it possible to accurately determine the entire color pattern of the convex portion 3. On the other hand, in FIG. 3B, since it is possible to extract a high area excluding the joint 2 and the concave portion 23, it is possible to determine the color by focusing on the top pattern on the outermost surface of the convex portion 3. The pattern color can be determined accurately. When the concave portion 23 has the same color as the surface of the convex portion 3, the threshold height is set to the height H1 as shown in FIG. When different colors are applied, the threshold height may be set to the height H2 as shown in FIG. In this case, it is possible to accurately determine the color of the region including the color of the surface of the convex portion 3.

  Note that at least one threshold value needs to be set as the threshold value, but a plurality of threshold values may be set. For example, the height between the joint 2 and the recess 23 is set as a first threshold, and the height between the recess 2 and the surface of the projection 3 is set as a second threshold. The excluded processed image data may be created, and color discrimination may be performed using the two processed image data. In that case, the accuracy can be improved by using a plurality of processed photographing data for color discrimination. When the decorative material 1 has a plurality of recesses 23 having different depths, a plurality of (three or more) threshold values can be set to create a plurality of processed photographing data.

[Embodiment 3]
FIG. 4 shows Embodiment 3 of the method for detecting the paint color of a decorative material.

  In the present embodiment, the decorative material 1 having the same shape as that described in the first and second embodiments can be used. However, the decorative material 1 is one in which the convex portion 3 is painted in a color different from the joint color.

  That is, in this embodiment, as the decorative material 1, a plurality of convex portions 3 are formed on the surface of the base material by joints 2 extending vertically and horizontally, and the convex portions 3 have colors different from joint colors (colors of joints 2). Inspect what is painted. The decorative material 1 has a rectangular shape as a basic shape, and the joint 2 of the entire decorative material 1 is composed of the joint 2 parallel to the long side and the joint 2 parallel to the short side. In addition, the vertical and horizontal directions in which the joint 2 extends are two directions (longitudinal direction and short direction) parallel to the long side and the short side of the decorative material 1. As described above, the vertical and horizontal directions may be two vertical directions, and the horizontal direction may be considered as the longitudinal direction and the vertical direction as the short direction, or vice versa. Further, the width of the joint 2 in the longitudinal direction and the width of the joint 2 in the short method may be the same or different.

  The convex part 3 is colored by painting. The convex portion 3 may be painted with one color or may be painted with a plurality of colors. Moreover, in the decorative material 1, the one convex part 3 and the other convex part 3 may be painted with a different color. Moreover, the convex part 3 may be patterned. When the convex portion 3 is painted with a plurality of colors, a colorful design is applied to the decorative material 1.

  The convex portion 3 may be a flat surface or may be provided with fine irregularities. When fine unevenness is provided, a more natural design can be created, and a brick-like design or a stone-like design can be expressed.

  The joint 2 is provided with substantially the same color throughout the decorative material 1. The color of the joint 2 may be colored by painting, or the color of the substrate material of the decorative material 1 may be the color of the joint as it is. The color of the joint 2 is the base color of the decorative material 1 and can be, for example, white, black, gray, or the like. The joints 2 having substantially the same color are usually formed of the same color paint or substrate material. The joint 2 is formed by recessing the decorative material 1, and has substantially the same depth throughout the decorative material 1.

  The decorative material 1 may be formed by a roll press. For example, the substrate material of the decorative material 1 is extruded by a roll press molding machine in which unevenness of the joint pattern is applied to the roll, and the extruded long molded product is cut to an appropriate length to obtain a flat surface. A rectangular molded product can be obtained visually. Then, by coating the entire surface of the molded product including the joint 2 with a base color, and further applying the projection 3 by roll coating or ink jet coating, the decorative material 1 as shown in FIG. 4 can be obtained. it can. Note that the molded product may be cut after painting.

  Such a decorative material 1 is subjected to color detection of the paint color in order to confirm the quality of the paint.

  Conventionally, as described above, color detection is performed using the photographing data of the decorative material 1 as it is without being processed. However, in that case, the accuracy of color detection is impaired due to the presence of the joint 2, and the color detection method is complicated. Here, the joint 2 is a portion having a small area and a color defect that is not conspicuous when viewed from the entirety of the decorative material 1, and a portion that contributes little to the pattern and color of the wall when the wall is formed. . Therefore, in the present embodiment, paying attention to the fact that the color of the cosmetic material 1 can be determined based on whether the color of the convex portion 3 is good or not, and whether the color of the cosmetic material 1 is good or not can be determined. It is to detect.

  In color detection, the short side and the long side of the decorative material 1 are matched with one of the short side and the long side (the short side in FIG. 4A) in the width direction (direction perpendicular to the transport direction) of the transport device. The other side (long side in FIG. 4A) is transported in accordance with the transport direction. That is, the decorative material 1 is inspected while being conveyed on the line. Detection efficiency is increased by line inspection, and the productivity of the decorative material 1 can be improved. In addition, the color detection of one decorative material 1 becomes one work.

  Then, a predetermined range of the decorative material 1 is photographed by the camera 4 and a deletion area including the joint 2 is detected and set. At this time, in the present embodiment, data obtained by photographing the conveyed decorative material 1 with the camera 4 is also used for detection of a deletion area.

  The photographing range 6 (frame range) of the camera 4 that is the predetermined range of the decorative material 1 preferably includes the entire length of the decorative material 1 in the width direction. When the entire length in the width direction of the decorative material 1 is photographed by one photographing process, the decorative material 1 can be photographed in the width direction with one frame without moving the lens of the camera 4 in the width direction. , Processing efficiency is increased.

  In FIG. 4A, the shooting range 6 shot by the camera 4 is a line area that is linear in the width direction. That is, the camera 4 is a line sensor camera in which the shooting range 6 is a line in the width direction. If such a line sensor camera is used, the entire width direction of the decorative material 1 conveyed can be efficiently captured and color-detected without moving the lens of the camera 4. In other words, since the entire width direction can be captured in one frame by using the line sensor camera, it is possible to process the photographing data 5 in one frame, and it is easy to detect the joint 2 and exclude it. . Moreover, since the linear imaging | photography data 5 are obtained continuously, it can make it easy to process the imaging | photography data 5 rather than the camera which has the imaging | photography range of other shapes, such as circular shape. Note that an area camera that captures a plurality of frames in the width direction may be used as the camera 4. In this case, however, data processing may be complicated.

  When photographing with the camera 4, it is preferable to illuminate the photographing range 6 with the light P by an illumination tool 7 such as line illumination. The color of the surface of the decorative material 1 becomes clear by the light P, and the color detection performance can be improved.

  Shooting data 5 shot by the camera 4 is continuously stored in a shooting data storage unit 15 of an appropriate arithmetic processing unit 8 constituted by a personal computer or the like via a connection cable 9 or the like. The arithmetic processing unit 8 processes the photographic data 5.

  In the processing of the photographic data 5, first, a color area having a predetermined length or more in the width direction and continuing substantially the same color is detected and set as a joint color area 21 in the width direction.

  An example of processing of the image data 5 will be described with reference to FIGS. 4B and 4C. FIG. 4B shows photographing data 5 of the decorative material 1 at the positions (i) to (i) in FIG. FIG. 4C shows the photographing data 5 of the decorative material 1 at the position (ii)-(ii) in FIG.

  In the example of FIGS. 4B and 4C, the line-shaped imaging data 5 is divided into a plurality of detection sections 10 in the width direction, and the determination is made by detecting the color of each detection section 10. For example, the color is determined by averaging the colors in one detection section 10. For color determination, for example, color difference values or color coordinates of L, a, and b expressed as color values can be used. At this time, at least one of L, a, and b may be used, or any two of them may be used, but it is preferable to use all three in order to improve the accuracy of color determination. For example, the length of one side of each detection section 10 can be the same as the width of the joint 2. Alternatively, it may be the size of the measurement range of the color difference detection means used. Note that the color determination is not limited to the method of dividing the shooting data 5 into the detection sections 10, and may be determined simply by a linear distance or by the number of continuous pixels.

  In the cases of FIGS. 4B and 4C, the joint color region 21 is a region where a predetermined number or more of detection sections 10 having substantially the same color continue. Thus, when detected by the detection section 10, the predetermined length to be set as the joint color region 21 is set by the number of detection sections 10 in which substantially the same color continues. Here, the predetermined length to be set as the joint color region 21 is set to a length exceeding the width of the joint 2 (joint 2 in the conveying direction) when the coating color of the convex portion 3 is a plurality of colors. be able to. Moreover, this predetermined length can be set to the length etc. which exceed the length of the width direction of one division of the convex part 3, when the coating color of the convex part 3 is the same color. In addition, in the decorative material 1 in which the joint 2 is formed in the width direction, it may be set to recognize the joint 2 when substantially the same color is connected to the entire width direction.

  In the photographing data 5 of FIG. 4B, the joint 2 in the width direction extends from one end portion in the width direction of the decorative material 1 to the center portion as shown in FIG. A region where substantially the same color continues in the width direction is recognized as a joint color region 21 in the width direction. Further, in the photographing data 5 of FIG. 4C, there is no joint 2 in the width direction of the decorative material 1 as shown by (ii) of FIG. 4A, so that substantially the same color continues in the width direction. Since there is no area, the joint color area 21 in the width direction is not recognized. Here, in FIG. 4C, a region of the color of the joint 2 (detection section 10) exists in the photographing data 5 due to the joint 2 in the transport direction, but this region is less than a predetermined length and has a width. It is not recognized as a joint color area 21 in the direction. By recognizing the joint color region, the joint region 2 in the width direction is accurately set.

  Next, the joint color area 21 in the width direction is set as a deletion area, and the deletion area is excluded from the shooting data 5. As the exclusion from the shooting data 5, the area of the joint color area 21 is removed from the shooting data 5 in which the joint color area 21 is set, and the remaining shooting data 5 is excluded from the shooting data 5 (processed in the width direction). Shooting data) can be used for the next processing. In that case, accurate color determination can be performed based on all the detected colors other than the joint color region 21. Or you may make it exclude the imaging | photography data 5 with the area | region recognized as the joint color area | region 21 of the width direction for every one frame. In this case, the single image data 5 can be excluded as it is for each frame, so that the color discrimination process is simplified. At this time, a part of the measurement color of the convex portion 3 is excluded. Usually, however, the joint color region 21 has an elongated shape and a narrow width, so that the influence on the overall color determination is small. Thus, the deletion region may be composed only of the joint color region 21 in the width direction, or may be a region extending in the width direction of the decorative material 1 in which the joint color region 21 in the width direction is formed. .

  Subsequently, when the photographing data 5 in the width direction is continuously accumulated in the arithmetic processing unit 8, the planar photographing data 5 is recorded by accumulating the photographing data 5 in the transport direction. The planar photographing data 5 may be the entire surface of the decorative material 1 or a part thereof. In the planar photographing data 5, a color area having a predetermined length or more in the transport direction and continuing substantially the same color is detected and set as a joint color area 22 in the transport direction. The predetermined length to be set as the joint color region 22 may be set by a specific numerical value, or, for example, when the predetermined length is divided by the detection sections 10 as described above And so on. Moreover, when the coating color of the convex part 3 is the same color, you may set as the thing exceeding the length of the conveyance direction of one division of the convex part 3 etc.

  Then, the detected joint color area 22 in the conveyance direction is set as a deletion area, and the deletion area is excluded from the planar photographing data 5. The shooting data 5 is excluded by removing the area of the joint color area 22 from the shooting data 5 in which the joint color area 22 is set, and removing the remaining shooting data 5 (processed shooting with processing in the transport direction). Data) can be used for color determination processing.

  In the above description, the processing of the photographic data 5 is described in which the joint color area 21 in the width direction is excluded from the individual photographic data 5 and then the joint color area 22 in the transport direction is excluded from the accumulated planar photographic data 5. However, the processing of the photographing data 5 is not limited to this. For example, the processed photographing data may be obtained by excluding both the joint color area 21 in the width direction and the joint color area 22 in the transport direction from the planar photographing data 5 at one time.

  In this way, processed image data is created by excluding the joint color region 21 in the width direction and the joint color region 22 in the transport direction from the image data 5, and color discrimination processing is performed based on the obtained processed image data. The color discrimination process can be performed by performing a color averaging process on the color values of the processed shooting data. Then, the paint color can be inspected by comparing the color average with reference color data stored in advance in the arithmetic processing unit 8. For example, compared with the reference color, the color of the decorative material 1 (that is, the convex portion 3) subjected to the color discrimination processing is determined to be good if the color value is within a predetermined range and defective if the color value is outside the predetermined range. Can be determined.

According to the paint color detection method for the decorative material 1 as described above, highly accurate color identification can be performed on the inspection line for measuring the color after the multi-color coating of the decorative material 1. Since the joint 2 of the decorative material 1 is usually provided in a straight line, it is easy to recognize as the joint 2 if the same color continues in a predetermined length in a predetermined direction. Therefore, joint 2 can it to distinguish between the convex portions 3 joint 2 and paint color is applied in a simple manner based color be in any position of the workpiece. Then, by detecting the base color applied to the joint 2 of the decorative material 1 and removing the color, the color is limited to the pattern top provided on the convex portion 3 without being influenced by the overall pattern of the decorative material 1. Discrimination can be performed easily.

  Further, the above color detection method is particularly useful for the decorative material 1 produced by roll press molding. In such a decorative material 1, the position of the joint 2, particularly the position in the conveyance direction in the joint 2 in the width direction, may differ for each decorative material 1 (workpiece) depending on the cutting position of the molded product. However, in the above method, the position of the joint 2 is not set in advance, but an area where substantially the same color continues is recognized for each work as the joint 2, so that the position of the joint 2 is accurately determined and the color is excluded. Thus, accurate color detection can be performed.

[Embodiment 4]
In the third embodiment, the case has been described in which both joints 2 in the width direction and joints 2 in the transport direction are set as deletion regions and excluded, but the processing of the imaging data 5 is not limited to this, and the width direction Only the joint 2 may be set as a deletion area and excluded. Hereinafter, this embodiment will be described as a fourth embodiment. The decorative material 1 and the device used for detection can be the same as those in the third embodiment.

  In the fourth embodiment, in the same manner as in the third embodiment described above, in the color detection, a color area in which the same color is continued for a predetermined length or more in the width direction from the photographing data 5 photographed by the camera 4 is a joint color in the width direction. The area 21 is detected and set. Then, the joint color area 21 in the width direction is excluded from the photographic data 5 as a deletion area. However, for the joint 2 in the transport direction, the joint color region 22 may be detected, but may not be detected. Then, without considering the joint 2 in the transport direction, color determination processing is performed based on the processed photographing data obtained by excluding only the joint color region 21 in the width direction. That is, the joint color area 22 in the transport direction may not be detected, and the joint color area 22 is used as it is for the color averaging process without being excluded from the processed photographing data. In this way, the joint 2 in the transport direction does not need to be considered. In the decorative material 1 having the joint 2, particularly in the roll press-molded decorative material 1, the joint 2 in the transport direction is the joint 2 in the width direction. This is because the position is unlikely to be different from that in FIG.

  In the fourth embodiment, it is not necessary to detect and exclude the joint color region 22 in the transport direction from the planar photographing data, and the color based on the data obtained by processing one frame of the photographing data 5 in the width direction. The color can be detected by simple processing.

  In the first and second embodiments, the deletion process is performed based on the height information. In the third and fourth embodiments, the deletion process is performed based on the color information. However, both the height information and the color information are deleted. Then, color discrimination may be performed. For example, if the quality determination is performed using two data, that is, the data that has been deleted using the height information and subjected to color determination, and the data that has been deleted using the color information and subjected to color determination, Inspection accuracy can be increased.

[Embodiment 5]
FIG. 5 is a schematic diagram showing Embodiment 5 of the method for detecting the paint color of the decorative material 1. In this embodiment, one decorative material 1 (work) is divided into a plurality of determination blocks in the width direction to perform color determination processing. In FIG. 5, the block is divided into four blocks: a determination block 1a, a determination block 1b, a determination block 1c, and a determination block 1d.

Divided determination process into a plurality of blocks, can be applied to Re fourth embodiments noise. Accordingly, the decorative material 1 and the detection device can be the same as those in the first to fourth embodiments.

  In this embodiment, the color discrimination process can be performed by performing a color averaging process on the color values of the processed shooting data for each of the determination blocks 1a to 1d. Then, the paint color can be inspected by comparing the color average with the reference color data corresponding to each of the determination blocks 1a to 1d previously stored in the arithmetic processing unit 8. At that time, as shown in each of the above embodiments, the processed image data may be obtained by excluding only the joint 2 as the deletion area, or the joint 2 and other areas may be used as the deletion area. You may use what was obtained by excluding as. For example, when applied to the first and second embodiments, a configuration in which only the joint 2 is excluded as the low-order region 20 can be used. Moreover, when applying to Embodiment 2, what excluded the joint 2 and the recessed part 23 as the low-order area | region 20 can also be used. In addition, when applied to the third embodiment, it is possible to use one excluding both the joint color region 21 in the width direction and the joint color region 22 in the transport direction. When applied to the fourth embodiment, What excludes only the joint color area | region 21 of the width direction can be used.

  And, for example, the paint color of at least one determination block of the determination blocks 1a to 1d of the cosmetic material 1 (that is, the convex portion 3) whose color is determined is compared with the reference color of the corresponding determination block, A product having a color value outside the predetermined range can be determined as a defective product. As described above, the cosmetic material 1 is divided into a plurality of determination blocks, and the color determination processing is performed on the individual determination blocks, thereby improving the accuracy of color detection.

  As shown in FIG. 5, it is particularly preferable that the color detection method divided into a plurality of determination blocks in the width direction is applied to a method for color detection by excluding only the joint color region 21 in the width direction as in the fourth embodiment. . By performing the averaging process by dividing the decorative material 1 into blocks in the width direction, the influence of joint colors in the transport direction can be further reduced, and color detection can be performed more easily and accurately.

[Embodiment 6]
As described above, in color detection, color differences and color values (color coordinates) of L, a, b, etc. are measured through a light receiving sensor (camera 4). May change significantly over time. For this reason, it is preferable to calibrate periodically using a calibration plate such as a white plate to calibrate the measured value. Therefore, a paint color detection method including the following calibration means will be described as a sixth embodiment. The calibration means described in the sixth embodiment can be added to any of the first to fifth embodiments.

  The calibration means described in the sixth embodiment is for periodically performing highly accurate calibration without disturbing the passage of the workpiece during online operation.

  In order to perform calibration with high accuracy, it is preferable to bring the calibration plate at the same position as the workpiece (decorative material 1) to be actually measured, but this is not possible during online operation or passing through the workpiece. Therefore, it is conceivable to perform calibration by inserting a calibration plate at the workpiece position when there is no workpiece passing. However, it is difficult to insert the calibration plate at the work position during continuous operation. It is also conceivable to perform calibration by inserting a calibration plate between the workpiece and the light receiving sensor. In inserting the calibration plate, it is conceivable to insert the calibration plate at a height that does not collide with the workpiece at a position as close as possible to the actual workpiece position. However, since the calibration plate is arranged at a position different from the actual work position, strictly complex correction is required for color detection with high accuracy.

  Therefore, in the sixth embodiment, calibration is performed using the calibration means shown in FIG. For calibration, a calibration plate 31 is used. The calibration plate 31 is composed of a white plate or the like. The calibration plate 31 may have a size (area) necessary for calibration, but may have a length in the width direction of the decorative material 1, for example.

  As shown in FIG. 6A, at the time of color measurement, a portion of the decorative material 1 (work) conveyed by the conveying means 30 such as a roller is irradiated with light by the illumination tool 7 by the camera 4 which is a light receiving sensor. Shooting. The color detection process (color data deletion, etc.) at this time is as described in each of the above embodiments. Then, periodically, for example, after a predetermined time elapses or after color detection of a predetermined number of decorative materials 1, calibration as shown in FIG. 6B is performed.

  As shown in FIG. 6B, for calibration, a calibration plate 31 is inserted between the decorative material 1 and the camera 4 by an appropriate calibration plate insertion mechanism such as an actuator. At this time, the calibration plate 31 is inserted at a position at a distance T from the surface of the decorative material 1 (the surface of the convex portion 3). The calibration plate 31 is preferably arranged in parallel with the surface of the decorative material 1. The camera 4 constituting the light receiving sensor is moved upward by an appropriate camera lifting mechanism such as an actuator. The lighting fixture 7 is also moved upward by an appropriate lighting fixture lifting mechanism such as an actuator. At this time, the camera 4 and the illuminating tool 7 are moved in parallel upward at a distance T equal to the distance T between the surface of the decorative material 1 and the surface of the calibration plate 31. Then, the relative positional relationship among the calibration plate 31, the lighting device 7, and the camera 4 is the same as the relative positional relationship between the decorative material 1, the lighting device 7, and the camera 4 at the time of color measurement. That is, in the camera 4 and the illumination tool 7, the relationship between the distance and the angle with respect to the calibration plate 31 is substantially equal to the relationship with the decorative material 1 at the time of color detection. In this state, the measurement color from the camera 4 is calibrated by the calibration plate 31.

  After the calibration is completed, the calibration plate 31 inserted between the decorative material 1 and the camera 4 is moved again to a position (standby position) outside the photographing range of the camera 4 by a calibration plate insertion mechanism or the like. In addition, the camera 4 and the illumination tool 7 are moved downward by each lifting mechanism and returned to their original positions. The downward movement distance at this time is the distance T moved during calibration. Then, as shown in FIG. 6A, color detection can be performed again based on the measurement color reference after calibration under the same measurement conditions as before calibration.

  Calibration is preferably performed in as short a time as possible. For example, in the case of continuous operation, it may be performed within the time during which one cosmetic material 1 passes under the camera 4, and the time during which half of the cosmetic material 1 passes under the camera 4. May be done within. When there is a distance between the decorative material 1 of one work and the decorative material 1 of the next work (such as when there is an empty work), the decorative material 1 is placed below the camera 4 between the works. Calibration may be performed when not. Even in this case, since the calibration plate 31 is not inserted at the position of the actual workpiece, even if the next workpiece is conveyed due to the time required for calibration, the conveyance of the workpiece is not hindered.

  Thus, in the calibration according to the sixth embodiment, when the calibration plate 31 is inserted at a height that does not obstruct the passage of the workpiece (decorative material 1), the difference in height between the calibration plate 31 and the actual workpiece is determined as the lighting fixture 7. The light receiving sensor (camera 4) is lifted upward and calibrated with the same relative positional relationship. Therefore, calibration can be performed easily and accurately even during online operation. Moreover, since not only the camera 4 but also the illuminator 7 is moved, the calibration plate 31 can be arranged under the same illumination conditions as the decorative material 1, so that calibration can be performed with high accuracy.

  The calibration means shown in the sixth embodiment is an example of calibration, and it goes without saying that the calibration may be performed by other calibration means in the first to fifth embodiments.

  As described above, in the color detection of the decorative material 1, the area including the joint 2 is detected and set as the deletion area. At that time, as in the first and second embodiments, a region including the joint 2 where the surface height is equal to or less than the threshold is detected as the lower region 20 and set as a deletion region. Alternatively, as in the third and fourth embodiments, at least the color data of the joint 2 in the width direction is set as the deletion area, and preferably the color data of both the joint 2 in the width direction and the joint 2 in the transport direction are deleted areas. Set to. Then, the color data of the set deletion area is excluded, and color discrimination processing is performed based on the processed photographing data from which the color of the joint 2 is excluded. Thereby, color discrimination can be performed easily and accurately, and the quality of the paint color of the decorative material 1 can be easily and accurately detected.

DESCRIPTION OF SYMBOLS 1 Cosmetic material 2 Joint 3 Convex part 4 Camera 5 Shooting data 6 Shooting range 7 Illumination tool 8 Arithmetic processing unit 11 3D camera 12 Laser irradiation apparatus 13 3D data storage part 15 Shooting data storage part 20 Low-order area 21 Joint color area of width direction 22 Joint color region in the conveyance direction 23 Recessed portion 31 Calibration plate P light L Laser light

Claims (6)

In detecting while conveying the coating color of the cosmetic material on which the convex portion is formed on the surface of the base material by joints extending vertically and horizontally, and the convex portion is coated,
The predetermined range of the cosmetic material is photographed with a camera, the cosmetic material is three-dimensionally measured, a region having a surface height equal to or lower than a threshold value is detected as a low region , set as a deletion region including joints, and the deletion is performed from photographing data. Create processing data by excluding the area,
A method for detecting a paint color of a cosmetic material, wherein color discrimination processing is performed based on the processed photographing data. The decorative material is provided with a concave portion having a depth between the convex portion and the joint, and the surface height threshold is a height between the joint and the concave portion, and the concave portion and the convex portion. The method for detecting a paint color of a cosmetic material according to claim 1 , wherein the color is at least one selected from the height between the surface and the surface. In detecting while conveying the coating color of the cosmetic material on which the convex portion is formed on the surface of the base material by joints extending vertically and horizontally, and the convex portion is coated,
The decorative material is one in which the convex portion is painted in a color different from the joint color,
Taking a predetermined range of the cosmetic material with a camera and detecting a color area in which the same color is continued for a predetermined length or more in the width direction in the shooting data as a joint color area in the width direction and set as a deletion area including a joint, Create the processed shooting data by excluding the deleted area from the shooting data,
And performing color discrimination processing based on the processing imaging data, of粧材paint color detection methods.   4. The cosmetic material according to claim 3, wherein, in the creation of the processed photographing data, the processed photographing data is created by excluding all photographing data having a region set as the joint color region for each frame. Paint color detection method. In the photographing data, a color area that is longer than a predetermined length in the transport direction and continues with substantially the same color is detected as a joint color area in the transport direction and set as a deletion area in the transport direction,
5. The method for detecting a paint color of a cosmetic material according to claim 3 , wherein the processing photographing data is created by excluding a deletion area in the transport direction to create processing photographing data . 6.   The method for detecting a paint color of a cosmetic material according to any one of claims 1 to 5, wherein the camera is a line sensor camera whose imaging range includes the entire length in the width direction of the cosmetic material.

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