JP2013242624A - Image processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processing method for properly reproducing a fine, indefinite and complex surface shape, and for freely varying vertical and horizontal lengths of the shapes, height differences, and a ratio thereof, easily.SOLUTION: A second captured image obtained by imaging a subject irradiated with illumination light from obliquely left or right direction and a third captured image obtained by imaging the subject irradiated with the illumination light from a direction symmetric to that of the second captured image, are synthesized with a first image obtained by imaging the subject irradiated perpendicularly with the illumination light, after inverse gradation treatment.

Description

  The present invention relates to an image processing method, and more particularly to an image processing method that can be used for manufacturing a mold used for rubber molding or the like.

  Conventionally, the surface is peeled and pear-finished by processing such as etching texture that bakes a pattern on the mold and immerses it in a corrosive solution to process unevenness on the mold surface or blast texture that applies sand to the mold using air. A mold processing method for adding a wrinkle pattern is known (see, for example, Patent Document 1). There is also a method of processing the surface of the mold by creating the shape data of the texture using CAD or the like based on the monochrome photo data.

JP-A-11-245234

  However, when trying to reproduce the surface imitating the surface structure of living organisms and plants that exist in nature, rather than artificially designed patterns and simplifications, conventional mold processing methods such as Patent Document 1 are simple. Otherwise, it would be too complicated and time consuming and costly, and it was difficult to reproduce on the product surface using a mold.

  If simplified due to time and cost, the mold can only be given a simplified pattern, and therefore the product made from the mold has the functionality that the surface structure of organisms and plants has. There was a possibility that it could not be fully demonstrated.

  Moreover, since the depth of the pattern which can be provided by the conventional method becomes shallow, there is a problem that durability against wear is low. In addition, since it is not a uniform continuous pattern, there is a problem that it is difficult to apply a continuous pattern to a curved surface or a three-dimensional object. That is, there is a problem that the reproduction of the pattern is limited and cannot be freely arranged.

  In addition, at the stage of taking a picture to obtain an original image for processing for creating CAD data for the mold, the shadow and reflection caused by the illumination of the photography causes a minute and complicated pattern on the surface of the organism or plant. It is difficult to copy accurately, and shadows may cause unevenness in the depth of the pattern, misrecognize the concave part in the convex part as a convex part, or misrecognize the concave part as a deep concave part. Further, it takes a lot of time and cost to correct this by image processing, and there is a problem that an irregular and complicated surface cannot be reproduced, such as a change in inclination of depth and bulge. There is also a problem that the size and depth of the pattern cannot be changed. If three-dimensional texture data is created based on normal photographed images of the target object, unintended surfaces due to overexposure and shadows due to lighting on the image, differences in exposure and contrast values, etc. There was a problem of processing. The human eye has the effect of appearing as a three-dimensional object due to reflection and shadow of light, but it becomes a problem to accurately capture the unevenness of the pattern. In particular, there is a problem that the uneven portion is erroneously recognized as a reverse uneven portion depending on the irradiation direction.

  In view of the above-mentioned conventional problems, the present invention can accurately reproduce even fine, irregular and complex surface shapes, and can easily arrange the vertical and horizontal lengths, height differences, and ratios of individual shapes. An object of the present invention is to provide an image processing method that can be used.

  According to a first aspect of the present invention, a first photographed image obtained by irradiating a subject with illumination light vertically is photographed by irradiating the subject with illumination light from an oblique direction leftward or rightward. The second photographed image and the second photographed image with respect to the subject are combined with a third photographed image obtained by irradiating illumination light from a symmetrical direction and then subjected to inverse gradation processing, and then synthesized. An image processing method is provided.

  The second photographed image and the third photographed image each preferably have an incident angle of illumination light of 30 degrees or more and 80 degrees or less.

  It is preferable that the subject is photographed with the photographing surface set up.

  Moreover, it is preferable that the reverse gradation process includes a step of superimposing the second photographed image and the third photographed image after correcting the gradation directions.

  According to the image processing method of the present invention, it is possible to easily reproduce even a fine, irregular, and complex surface shape, and to freely arrange the length, width, height difference, and ratio of each shape.

It is a whole flow explanatory view of the image processing method of Example 1 of the present invention, and a metallic mold processing method using the same. It is a figure which shows the imaging | photography method of the imaging | photography step of the image processing method of Example 1 of this invention. It is a schematic diagram which shows the irradiation method in the imaging | photography step of the image processing method of Example 1 of this invention. FIG. 4A is a schematic diagram of a shadow that appears on a subject by illumination light, and FIG. 5B is a schematic diagram in the case of a concave subject, and FIG. It is a detailed flowchart of the process step in the image processing method of Example 1 of this invention. It is explanatory drawing which shows the pin light calculation process in the image processing method of Example 1 of this invention. It is explanatory drawing which shows the bibit write calculation process in the image processing method of Example 1 of this invention. It is a figure which shows the synthesized image after completion of the image process in Example 1 of this invention. It is a cutting image figure using the image processing method of Example 1 of the present invention. It is explanatory drawing of the variation using the image processing method of Example 1 of this invention. It is a detailed flowchart of the process step in the image processing method of Example 2 of this invention. It is explanatory drawing which shows the exclusion calculation process in the image processing method of Example 2 of this invention. It is explanatory drawing of the outline creation process in the image processing method of Example 2 of this invention. It is a figure which shows the synthesized image after completion of the image process in Example 2 of this invention. It is a cutting image figure using the image processing method of Example 2 of the present invention. It is a detailed flowchart of the process step in the image processing method of Example 3 of this invention. (A) A schematic diagram of a shadow appearing on a subject by illumination light, and (b) a diagram showing an example of an image of a corresponding portion. It is explanatory drawing which shows the partial deletion process by the eraser tool in the image processing method of Example 3 of this invention. It is a figure which shows the synthesized image after completion of the image process in Example 1 of this invention. It is a cutting image figure using the image processing method of Example 3 of the present invention.

  An embodiment for carrying out the present invention includes a photographing step for acquiring a photographed image of a subject and a processing step for processing and synthesizing the photographed image to create three-dimensional data, wherein the photographing step includes the subject Takes a shooting surface upright, an installation step of fixing the camera at a position in front of the subject, and irradiating illumination light perpendicularly on the subject to shoot and obtain a first shot image A first photographing step, a second photographing step of obtaining a second photographed image by irradiating the subject with illumination light obliquely from left or right, and obtaining the second photographed image with respect to the subject. The second photographed image includes a third photographing step of obtaining a third photographed image by irradiating with illumination light from a symmetrical direction.

  As one form for carrying out the present invention, when the subject is a bulging portion, the processing step includes (1) the first photographed image, the second photographed image, and the third photographed image. A gray scale step in which each of the captured images is a gray scale, and (2) an exposure amount process for darkening the entire image of the second captured image and the third captured image that have undergone the gray scale step, Reversing the gradation to change the gradation direction, reducing the brightness so that the grayscale is 50% or more with contrast that maintains the smoothness of the gradation, and then overlaying with pinlight calculation processing or multiplication operation processing A reverse gradation processing step for adjusting the contrast of the shadow together, and (3) the second photographed image that has undergone the reverse gradation processing step, and A superposition step of superimposing the first photographed image on the superposed image of the third photographed image by vivid light calculation processing; and (4) combining all the superposed photographed images into one composite image. And (5) an adjustment step for adjusting the contour and contrast of the synthesized image.

  As one form for carrying out the present invention, when the subject is a portion having a dent, the processing step includes (1) the first photographed image, the second photographed image, and the third photographed image. And (2) the second photographed image and the third photographed image that have passed through the grayscale step are subjected to gradation of the dent portion while brightening the entire image. A reverse gradation processing step for superimposing in a correct exclusion calculation process; and (3) combining the second captured image and the superimposed image of the third captured image that have undergone the reverse gradation processing step, and a place other than the dent portion. Select, Brighten the image with the contrast tool, and smooth the gradation with the blur tool. And (4) processing the first captured image captured by vertically illuminating the subject with the second captured image and the third captured image superimposed on each other. Superimposing and correcting / contour creation processing steps for creating a contour by superimposing and adjusting brightness and contrast on the combined and processed images.

  As one form for carrying out the present invention, when the subject is a portion where a mountain and a dent are combined, the processing step includes (1) the first photographed image and the second photographed image. A gray scale step in which each of the image and the third photographed image is a gray scale; and (2) exposure that darkens the entire image of the second photographed image and the third photographed image that have undergone the gray scale step. Quantitative processing, inversion of gradation to change the gradation direction, and after reducing the brightness so that the grayscale is 50% or more with contrast that maintains gradation smoothness, An inverse gradation processing step for adjusting shadow contrast by superimposing by multiplication operation processing; and (3) the second gradation processing step that has undergone the inverse gradation processing step. A superposition step of superimposing the first photographed image on the superimposed image of the shadow image and the third photographed image by vivid light computation processing; and (4) the second photographed image and the second photographed by the pinlight computation processing. A duplication step for duplicating an image obtained by superimposing the three photographed images, and (5) a gradation tool processing step for selecting a dent portion in the superimposed image, processing the white with a gradation tool, and simultaneously smoothing the gradation with a blurring process. And (6) a duplicated image superimposing step of superimposing the duplicated image on the processed superimposed image while performing gradation inversion or exclusion calculation processing, and (7) the top of the eraser tool. A step of deleting a portion other than the recessed portion of the image being erased, (8) a step of combining images to be combined with the superimposed images, and (9) And a gradation adjustment step of processing smoothly the Deshon.

  Hereinafter, preferred embodiments of the image processing method of the present invention will be specifically described using examples.

<Overall flow>
FIG. 1 is an explanatory diagram of an overall flow of an image processing method and a mold processing method using the image processing method according to Embodiment 1 of the present invention. Steps 1 and 2 in the overall flow in FIG. 1 are steps of the image processing method according to the first embodiment of the present invention. The mold processing method using this includes the steps of the image processing method of the first embodiment, and further includes steps 3 to 6 as a whole. In the image processing methods in and after Example 2 to be described later, the contents of the entire step 1 are common, and the contents of the entire step 2 are common in each embodiment in the outline. The mold processing method using the image processing method according to the second embodiment or later includes the steps of the image processing method of each embodiment, and includes the same steps 3 to 6 as described above.

  In the overall flow, first, an image obtained by photographing a subject that uses the shape for mold processing is digitized (step 1). Next, the digitized surface image is processed (step 2). Then, the image that has undergone the image processing in step 1 and step 2 is read into the design system apparatus and digitized (step 3). Then, it is determined whether the numerical value can be read correctly. If the numerical value cannot be read correctly, the process returns to step 2. If the numerical value can be read correctly, the process proceeds to step 5 described later (step 4). If the numerical value can be read correctly, the mold is designed and cut based on the numerical value obtained in step 4 (step 5). And it finishes and commercializes (step 6).

  In the present embodiment, in the entire step 2, the illumination light is irradiated to the first photographed image obtained by irradiating the subject vertically with the illumination light from the left side or the right side obliquely. The second captured image captured in this way and the second captured image of the subject are combined with a third captured image captured by irradiating illumination light in a symmetric direction and subjected to inverse gradation processing. .

<Devices used>
In the image processing method according to the first embodiment of the present invention, a photographing device for photographing a subject, an irradiation device for irradiating the subject with light, and a photographed image obtained by photographing are processed to generate three-dimensional data. An image processing device is used. In the mold processing method of the first embodiment of the present invention using this, a design system apparatus and a mold processing apparatus are further used.

{Photographing device}
The imaging apparatus used in the present embodiment is an imaging lens as an optical system that collects light from a subject, and a light beam from the imaging lens is a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) type inside the body. This is a camera having a general function of outputting an image formed on the photoelectric conversion surface of the photoelectric conversion unit as image data when the shutter is operated, and is connected to the image processing apparatus. In order to reproduce the surface imitating the surface structure of living organisms and plants existing in nature, the subject is not a planar image such as a photograph, but is a real object, that is, a living organism or plant in nature.

  There are various sizes on the surface of natural samples, from fine irregularities to large external shapes. Therefore, the size of the shooting range of the sample as a subject is divided into two types: a large subject and a small subject, and the camera to be used is changed according to the type.

  For large subjects, use a “single-lens camera”. In addition, since the maximum focal length of the “single-lens camera” is 25 cm, “reverse adapter” and “macro lens” are used as connecting parts for macro (short-distance) shooting.

  Here, the “reverse adapter” is a component for attaching the camera lens in the reverse direction, and can be fitted into the mount portion of the camera so that a focal length of about 20 mm can be taken. A “macro lens” is a lens that is attached to the lens of a camera, and is capable of high-magnification close-up photography. Both can perform macro photography, but the “reverse adapter” is slightly higher magnification than the “reverse adapter”. However, shooting is difficult because the focus is manually controlled. In the case of a “macro lens”, although it is not at a higher magnification than the “reverse adapter”, it is automatically focused and can be used easily.

  For small and fine samples, use a USB microscope. The magnification can be increased up to 230 times, and irradiation photography can be easily performed by combining the attached front illumination function with the illumination of other equipment. In this embodiment, a USB microscope (Dino Lite Premier: Eland Co., Ltd.) is used, but the present invention is not limited to this.

  The USB microscope used in this example is a digital microscope with a measurement function, has an imaging lens in the front, eight LED lights are arranged so as to surround the outer periphery of the lens, and an enlargement factor and It has a dial that adjusts the focus, and can connect to a computer using a USB terminal provided at the back to magnify a photographed image and shoot while checking the monitor. It is also possible to measure the actual size of the pattern on the surface of the sample that is the subject during monitoring. Moreover, it has a stand as an auxiliary tool for setting and fixing an angle freely.

{Irradiation device}
The irradiation device used in this embodiment may be any illumination light such as a tungsten light source using a light bulb, a halogen light source, or a strobe light source using a strobe. The first illuminating light composed of eight attached LED lights and the portable second illuminating light and the third illuminating light which can be arranged and fixed on the left and right of the photographing apparatus were used. Relatively bright HMI (Hydrargyrum Medium-arc Iodide) was used for the second illumination light and the third illumination light arranged on the left and right sides of the first illumination light. HMI emits light close to sunlight and can reproduce natural gradations, so it is suitable for accurately copying the unevenness of natural objects. A surface light source with a constant luminous flux is desirable. A board was used to enable spot photography as a tool to assist other irradiation. A tripod and boom unit were used to adjust the angle and height.

  In the image processing method of the present embodiment, shooting is performed with a subject standing. Therefore, the board is used upright. It is preferable to have an auxiliary member for standing and fixing the subject on the front side of the board.

{Image processing device}
In this embodiment, the image processing apparatus is a computer connected to the photographing apparatus, and the function that grasps the contour and height difference of the surface shape of the subject and expresses it with gradation for the captured image, and the processed image data can be read by the design system. It has a function to make various file formats. The image processing apparatus according to this embodiment includes highlight processing, exclusion calculation processing, pin write processing, multiplication calculation processing, bibit calculation processing, color mode change, gradation inversion, partial selection, partial deletion, brightness and contrast adjustment. Image processing software capable of contour extraction, overlaying, blurring, and other general image processing, for example, Photoshop by Adobe Systems, is installed.

{Design system equipment}
The design system apparatus is an apparatus equipped with software having a function of generating a control program for processing a product designed by a machine tool (a mold processing apparatus in this embodiment). In the present embodiment, the design system apparatus equipped with the ArtCAM ArtCAM is used as software having a CAD (computer aided design) function and a CAM (Computer aided manufacturing) function. However, the present invention is not limited to this.

{Die processing equipment}
In this embodiment, MyCenter3Xi (manufactured by Kitamura Machinery Co., Ltd.) is used as a mold processing apparatus that creates a rubber mold by cutting using a control program created by ArtCAM. However, the present invention is not limited to this.

<Image processing method>
The image processing method of the present embodiment digitizes an image obtained by photographing the entire step 1 and step 2 in FIG. 1, that is, a subject that uses the shape for mold processing, and then digitized. A surface image is processed.

  The image processing method according to the present embodiment processes a shooting step and a shooting image in which the subject is fixed with the subject standing, the camera is fixed at a position in front of the subject, and the captured image is acquired. Processing steps for creating three-dimensional data.

  FIG. 2 is a diagram illustrating a photographing method in the photographing step of the image processing method according to the first embodiment of the present invention. As shown in FIG. 2, the subject 2 is fixed in an upright state, and the camera 3 is fixed at a position in front of the subject to capture an image. As the subject, shark skin used in wasabi grater was used.

  When photographing from above, it is difficult to adjust the angle of the irradiation equipment, and there is a limit to the angle adjustment. In addition, when a photographer looks into the camera's viewfinder, the shadow of a person is reflected on the sample surface, which is the subject, and correct gradation cannot be captured. According to the present embodiment, since the subject is photographed from the horizontal direction with the subject vertical, photographing with correct gradation can be performed. When shooting from the horizontal direction, the angle and distance of the irradiation equipment can be easily adjusted, and there is no limit. It also eliminates the problem of the shadows of people appearing in the sample when looking through the viewfinder.

  In this embodiment, the photographing step includes (1) an object in which the surface to be photographed is raised and an installation step for fixing the camera at a position in front of the subject, and (2) illumination light perpendicular to the subject. A first photographing step of obtaining a first photographed image by irradiation and (3) a second photographed image obtained by irradiating the subject with illumination light obliquely from the left direction or the right direction. And (4) a third shooting step in which the second shot image is shot by irradiating illumination light from a symmetric direction to acquire a third shot image.

  FIG. 3 is a schematic diagram illustrating an irradiation method in the photographing step of the image processing method according to the first embodiment of the present invention. The front side in FIG. 3 is the upward direction, and the back side is the downward direction. The photographing device is set in front of the surface of the subject fixed upright, and the illumination lights 1a, 1b and 1c are arranged in a horizontal position with the same height from the floor. Subject 2 is photographed three times. Both are photographed by the camera 3 which is a photographing device fixed in front of the subject 2. An image captured by irradiating light perpendicularly to the surface, an image irradiated with light from the licked right direction, and an image irradiated with light from the licked left direction are acquired. The incident angle of the illumination light from the licked right direction and the incident angle of the illumination light from the licked left direction are equal. Irradiation at an equal angle and digitization makes it possible to accurately reproduce the unevenness of the subject.

  The second photographed image and the third photographed image each preferably have an incident angle of illumination light of 30 degrees or more and 80 degrees or less, and on the raised surface, the incident angle of illumination light is 30 degrees or more and 60 degrees. The following is more preferable. Moreover, it is more preferable that the incident angle of illumination light is 60 degrees or more and 80 degrees or less on the concave surface. Note that it is not necessary to specify the irradiation distance or the irradiation angle by the subject, so that the photographing operation is easy.

  In this embodiment, the incident angle of the illumination light in the first captured image is 0 degree, the incident angle of the illumination light in the second captured image is 45 degrees to the right, and the incident angle of the illumination light in the third captured image is 45 degrees to the left. Note that the incident angle is 0 degree when entering the surface perpendicularly, and 90 degrees when entering the surface horizontally.

  In this embodiment, at the time of shooting, the enlargement ratio and focus are adjusted with the dial of the body portion. Further, the photographed image is enlarged on a display screen of a computer connected using the USB terminal, and photographed while checking the monitor. Measure the actual size of the pattern on the surface of the subject when monitoring. The actual size of the X-axis and Y-axis is measured using lines and figures, and the data is saved.

  4A and 4B are schematic diagrams of shadows appearing on the subject due to illumination light. FIG. 4A is a schematic diagram in the case of a concave subject, and FIG. 4B is a schematic diagram in the case of a swelled subject. In both (a) and (b), a diagram showing a gradation appearing in an image of a subject and a diagram in which gradations relating to a sectional view of the subject are superimposed are compared side by side. Gradation is an expression in which two different colors and shades change smoothly and continuously.

  In FIG. 4 (a), although the subject has the deepest dent at the center, the dent on the irradiation direction side becomes whitish because the gray scale value becomes lower and whitish as the dent on the irradiation direction side becomes deeper. It will appear. In addition, the phenomenon of whiteout that is bright due to reflection of the illumination light is likely to occur in this portion, and the whiteout portion appears as a sudden bulge even if it is a dent. In addition, the contrast is strong in the places where the illumination light is shining strongly, and therefore the unevenness is greatly shown, but the contrast is weak in the places where the illuminating light is not reaching so much and the light is shining weakly. It appears small. On the other hand, on the opposite side of the irradiation direction, since the gray scale value of the bulge portion is high and blackish, it appears as a dent instead of a bulge and a deeper dent than the inner dent.

  In FIG. 4 (b), the object has a gentle peak at the center, but on the other side of the irradiation direction, the gray scale value of this portion is high and black, so it appears as a steep dent. In addition, the hills on the opposite side of the irradiation direction also appear as dents rather than bulges because the gray scale value becomes lower and whiter from the center to the periphery, contrary to the subject.

  Therefore, in either case of FIGS. 4A and 4B, correct three-dimensional data cannot be created as it is.

  In the present invention, the protruding portion is relatively white, the higher the protruding height, the more white, the recessed portion is relatively black, the deeper the dent depth is, the blacker the gradation value from white to black is. Can represent the height at each location on the surface, and thus three-dimensional data can be created correctly.

  The second photographed image taken by illuminating the subject with the illumination light obliquely from the left direction or the right direction and the subject photographed by illuminating the illumination light from the symmetrical direction. In the third photographed image, both in the irradiation direction side and the opposite side of the irradiation direction in the same image, the bulging part and the recessed part appear in shadows, that is, the gradation direction is reversed. Become.

  In the present invention, the reverse gradation process is a process of superposing after correcting the gradation directions of the second photographed image and the third photographed image to be aligned. For example, in both the second photographed image and the third photographed image, the point where the bulging portion on the opposite side of the irradiation direction is shaded and the concave portion is brightened, that is, the gradation direction is changed. Align and overlay both images. Errors due to white reflection caused by reflection of light occurring on the irradiation direction side and differences in lighting (difference in how illumination light reaches) are also corrected by such processing.

  After performing the inverse gradation process, in order to further extract the contour and correct the inversion of the gradation direction, the first photographed image obtained by irradiating the subject with the illumination light vertically is superimposed.

  In the process of superimposing, the overall brightness becomes too bright or too dark, or the contrast deteriorates.

{Convex part treatment}
FIG. 5 is a detailed flowchart of processing steps in the image processing method according to the first embodiment of the present invention. In the image processing method according to the first embodiment, the processing step is a processing step when the surface shape of the imaging target is a mountain surface. In FIG. 5, each step is expressed as steps 1 to 9 of the convex portion processing and is distinguished from the overall steps 1 to 6 shown in FIG. 1.

  In this embodiment, the “reversal of gradation” function for reversing the color is used, and the gradation of the second captured image and the third captured image is indented white by performing the reverse gradation process, and the protruding portion is white. Return to the normal gradation direction, where the area is black. After that, a contrast calculation process is performed, and the contour extraction is performed by superimposing the first captured images.

(start)
The first captured image, the second captured image, and the third captured image are taken into the image processing apparatus, and image processing is started.

(Step 1)
Step 1 of the convex processing is changing the color mode. Specifically, the convex portion processing step 1 is a gray scale step in which the first photographed image, the second photographed image, and the third photographed image are gray scales, respectively. In order to make it easy to recognize the color value after overlapping the images, the color mode of each image is changed from “RGB” to “Grayscale”.

(Steps 2-5)
Steps 2 to 5 of the convex processing are inverse gradation processing steps in the case where the subject has a bulge, and darken the entire image of the second and third captured images that have undergone the gray scale step. Pin light calculation processing after reducing the brightness so that the gray scale becomes 50% or more with contrast that maintains the smoothness of the gradation by performing exposure amount processing, reversing the gradation that changes the gradation direction Alternatively, it is an inverse gradation processing step in which the contrast of the shadow is adjusted by superimposing by multiplication operation processing.

(Step 2)
Step 2 of the convex portion processing is exposure amount processing (highlight processing). More specifically, the second captured image and the third captured image that have undergone the gray scale step are subjected to an exposure amount process that darkens the entire image.

  In the exposure processing, the gradation of the image irradiated from the left and right is smoothed while darkening the entire image. This process minimizes the effect on shadows and adjusts highlights. There are three processing functions for the exposure amount, and the exposure amount, offset, and gamma are adjusted for processing. In adjusting the exposure amount, the influence on the darkest shadow is minimized, and the highlight of the tone is adjusted. Adjusting the offset minimizes the effect on highlights and darkens shadows and midtones. In the gamma adjustment, a correction operation for obtaining a more natural display is performed by adjusting the relative relationship between color data such as an image and a signal when the data is actually output.

(Step 3)
Step 3 of the convex processing is gradation inversion processing (gradation direction correction). Specifically, the gradation is changed to change the gradation direction.

  In the gradation inversion process (gradation direction correction), the image subjected to the exposure amount process is subjected to a process called gradation inversion to return the reverse gradation to the original direction. When the tone of the image is inverted, the brightness value of each pixel in the channel is converted to the opposite value on the 256 tone color value scale. For example, a pixel with a value of 255 in the positive image is changed to 0 and a pixel with a value of 5 is changed to 250.

(Step 4)
Step 4 of the convex processing is brightness / contrast processing. More specifically, the brightness is lowered so that the gradation is kept smooth and the gray scale is 50% or more.

  Brightness / contrast processing is performed several times to maintain gradation smoothness while darkening the image. For example, the brightness is decreased to the maximum all three times, and the contrast is increased once or twice and finely adjusted the third time.

(Step 5)
Step 5 of the convex process is a pin light calculation process or a multiplication calculation process (gradation superposition). Specifically, the contrast of the shadow is adjusted by superimposing by pin write calculation processing or multiplication calculation processing.

  In pinlight calculation processing or multiplication operation processing (gradation superposition), the processed left and right images are overlapped by an arithmetic processing called “pinlight”, and the shadow contrast is adjusted by opacity processing (painting) of the lower image. .

  FIG. 6 is an explanatory diagram illustrating pin write calculation processing in the image processing method according to the first embodiment of the present invention. The pin light calculation process is a process in which a color is replaced according to a composite color. If the composite color is darker than 50% gray, pixels that are lighter than the composite color are replaced. Pixels darker than the composite color are not changed. The reason why the image has been darkened in the previous steps is to replace the dark image by setting the composite color to 50% gray or more, and to eliminate the brightness difference of the image and leave a gradation.

  In the example of FIG. 6, in the portion A, the gray scale value in the upper image (image irradiated with illumination light from the right direction) is 95%, and the gray scale in the lower image (image applied with illumination light from the left direction). The value is 90% and the upper image is darker than the lower image and is replaced. At the location B, the gray scale value in the upper image is 95% and the gray scale value in the lower image is 94%, and the upper image is darker than the lower image, so it is replaced.

  That is, the superimposed images are overlaid so that the gray scale is 50% or more, and at each point of the image, the image that is brighter than the superimposed image of the second captured image and the third captured image. Replace with brightness. Then, a superimposed image is created by adjusting the contrast. In superposition, each image exists as a layer in one image file, and the images are not combined.

(Step 6)
In step 6 of the convex processing, after step 5 is completed, it is checked whether the gradation of the superimposed images is uniform as a whole. If it is uniform, the process proceeds to step 7; Returning to step 4, the determination step.

(Step 7)
Step 7 of the convex processing is bibit write calculation processing (contour extraction / gradation correction). More specifically, in order to further correct the reversal of the gradation direction by extracting the contour, the first captured image captured by irradiating the subject with illumination light perpendicularly is referred to as the second captured image described above. This is a superposition step of superimposing the third photographed image on the processed image.

  Front-illuminated images are superimposed from the top by vivid light calculation processing, and the image is brightened by brightness / contrast processing. Since the front-illuminated image has an outline, the outline of the pattern becomes clear by superimposing the images. This process removes the surrounding contrast and makes the contour from the top clear. Also, correct shadow contrast and gradation.

  FIG. 7 is an explanatory diagram illustrating a bibit write operation process in the image processing method according to the first embodiment of the present invention. In the bibit light calculation processing, the contrast is increased or decreased according to the composite color, and color printing or dodging is performed. When the composite color (light source) is brighter than 50% gray, the contrast is lowered to brighten the image, and when darker than 50% gray, the contrast is increased to darken the image.

  In the example of FIG. 7, in the portion A, the gray scale value in the upper image (image vertically illuminated with illumination) is 30%, and the gray scale value in the lower image (left-right superimposed image) is 92%. Since the upper image is brighter than the lower image, the image is brightened when superimposed. However, the gradation remains even if brightened. In the portion B, the gray scale value in the upper image is 0% and the gray scale value in the lower image is 94%. Since the upper image is brighter than the lower image, the image is brightened when superimposed. .

(Step 8)
Step 8 of the convex processing is image combination. Specifically, a total of three layers of the first photographed image, the second photographed image, and the third photographed image superimposed in advance are combined into one. That is, it is a compositing step that combines all the superimposed captured images into one composite image.

(Step 9)
Step 9 of the convex processing is correction / contour creation processing. Specifically, this is an adjustment step for adjusting the synthesized image.

  The processing of each tool such as a correction brush tool, exposure amount, edge enhancement, contour tracing, etc., improves the contrast and contour accuracy of the image, and performs final adjustment of the digital image. The correction brush tool allows you to blend incomplete parts into the surrounding image and correct fine gradations. If the outline is not drawn well, a boundary line is drawn with a tool called a boundary line.

  The usage example of the tool that performs processing in this step is as follows. The edge enhancement tool emphasizes the edges of an image. When the edge brightness control is set to a high value, the emphasized edge appears to be painted with white chalk. When the set value is low, it looks like it was painted with black ink. This process performs contrast adjustment and contour enhancement. The blur (surface) tool blurs the image while retaining the edges. This filter removes noise and roughness when creating special effects. This process corrects the gradation smoothly. The blur tool softens sharp edges in the image and blurs details. This process is similar to blurring (surface), but this process is used to partially smooth the gradation. The correction brush tool corrects incomplete parts and blends in with the surrounding image. It is also possible to paint using pixels sampled from an image or pattern. The Repair Brush tool matches the texture, brightness, shading, and transparency of the sampled pixel with the destination pixel. The repaired pixels blend seamlessly into the rest of the image. The border tool draws a line on the outline of the selection. This process creates the backmost gradation. It is also possible to extract only the contour.

  In this embodiment, since the subject has a bulge, the outside of the boundary line is black.

(End)
After completing steps 1 to 9 of the convex processing, the image processing is terminated. FIG. 8 is a diagram illustrating a composite image after completion of image processing in Embodiment 1 of the present invention. The surface condition of the subject is shown in detail with gradation from white to black.

{After image processing}
FIG. 9 is a cutting image diagram using the image processing method according to the first embodiment of the present invention. After completing Step 2 in the overall flow, that is, processing of a surface image obtained by digitizing and digitizing an image obtained by photographing a subject that uses the shape for mold processing, Load it into the design system and digitize it. In step 4, it is determined whether the numerical value can be correctly read. If the numerical value cannot be read correctly, the process returns to step 2. If the numerical value can be read correctly, the process proceeds to step 5 described later. If the numerical value can be read correctly in step 5, next, the mold is designed and cut based on the numerical value obtained in step 4. In step 6, finishing is performed to produce a product. FIG. 9 is a cutting image by ArtCAM. According to the present embodiment, it can be seen that a minute portion in the inclined portion of the surface of the subject can be accurately reproduced.

  In FIG. 8, the outer side of the boundary line is black (lowest), the inner side is also black, and gradually becomes white (highest) toward the central convex portion. The height at the boundary line is set to plus or minus 0, and this is defined as the lowest part, and the two-dimensional coordinate data inside the boundary line and gradation data (gray scale ratio data) from white to black corresponding to each coordinate data, In No. 9, gradation data is converted into height data to become three-dimensional data.

  The composite image after completion of the image processing can be changed in size and shape of the unevenness by using free deformation in editing. As a result, it is possible to enlarge / reduce the size and shape of the extracted surface. The surface irregularities are extracted and arranged so as to align with the drawing. If the background color is mountain, use black. On the other hand, if it is a dent, use white. When using black, the layout background is created by creating a new layer and processing it with the gradient tool. Place the extracted surface on the processed layer.

  In addition, when the surface irregularities are extracted and arranged, the scroll processing wraparound (rewind) setting is performed as a method of aligning the joints by arrangement so as not to cause a problem that the joints between the images are not aligned. . In other words, the surface of the image end face portion is rewound to the opposite side by scroll processing, and the joints are aligned. In this manner, arrangement data is created. As a drop in CAD / CAM, the arrangement data created as described above is read in Art CAM in JPEG format. Then, it is converted into digital data on industrial CAM or stl data and converted into a numerical value from CAD for industrial products.

  That is, in step 3 of the overall flow, for the image synthesized by image processing, the gray scale ratio is set as data in the Z-axis direction, and each dimension is arbitrarily enlarged and reduced and arranged in any number of combinations. , Create layout data that can be read by the mold processing device, load it into the design system device, and digitize it.

  Therefore, it can be set as a continuous pattern, and thereby a natural continuous pattern can be cut on the mold.

  When the numerical value can be read correctly, a die is designed based on the numerical value, cutting pattern data is created, and cutting is performed based on the cutting pattern data. When only the contour is extracted and the line is designed, a path is created from the image processing apparatus, the ai data is added, and the result is dropped into CAD. FIG. 9 shows data dropped by specifying the JPEG image of FIG. 8 so that Z = 3 mm is the maximum height in the range of X = 150 mm and Y = 150 mm.

  The two-dimensional coordinate data and the gray scale data at the position are converted into data corresponding to the two-dimensional coordinate data and the normal vector data (height: Z axis) at the position, respectively.

  In ArtCAM, the height of the relief can be changed arbitrarily. FIG. 10 is an explanatory diagram of variations using the image processing method according to the first embodiment of the present invention. For example, the highest height of the pattern (white in gradation data) is set to a height of +2.8 mm (FIG. 10B) or a height of +0.7 mm (FIG. 10A). As shown in the figure, the height of each part expands and contracts according to the height of the white part. For example, if the gray scale is 0% (white) and the height in the Z-axis direction is +2.8 mm, the height of the gray scale portion of 50% (gray) is +1.4 mm and the gray scale is 0% (white). If the height in the Z-axis direction is +0.7 mm, the height in the Z-axis direction of the gray scale 50% (gray) part is +0.25 mm, and the relief details are not lost even if the height is expanded or contracted . On the other hand, in order to make the surface smoother, smoothing that averages fine irregularities can be performed in ArtCAM.

{effect}
According to the image processing method of the present embodiment, it is possible to easily reproduce even a fine, irregular, and complex surface shape, and to freely arrange the vertical and horizontal lengths, height differences, and ratios of individual shapes. .

  According to the image processing method of the present embodiment, the influence of shadows and reflections caused by shooting illumination can be eliminated, and fine and complex patterns on the surface of organisms and plants can be accurately copied, resulting in unevenness in pattern depth. There is no possibility that the concave portion in the convex portion is erroneously recognized as the convex portion, or that the contour portion is deeply recognized as the concave portion. Therefore, the time and cost of image processing can be reduced, the delivery time can be shortened, and an irregular and complex surface such as depth and bulge change can be reproduced. In addition, since the size and depth of the pattern can be changed, it can be used for various situations. There is no risk of unintentional surface processing due to differences in whiteout, shadows, exposure amount, and contrast values due to lighting adjustments on the image. The problem that will be solved.

  In this embodiment, the part of the protrusion that is a gentle crest is shown as a steep dent, or it appears as a dent instead of a bulge from the center to the peripheral part, or a bulge of the same height However, it can be prevented that the height of the bulge is different due to contrast.

  Note that the mold processing method described above has the gray scale ratio for the composite image having the two-dimensional coordinate data of the image processed by the image processing method of the present embodiment and the gray scale ratio at each coordinate data point. As the data in the Z-axis direction, each dimension is arbitrarily scaled and arranged in an arbitrary number of combinations to align the joints and create layout data that can be read by the die processing apparatus. . According to such a mold processing method, a surface pattern that reproduces even a fine, irregular and complicated surface shape, or a surface pattern that freely arranges the vertical and horizontal lengths, height differences, and ratios of individual shapes is continuously provided. The mold can be applied to the product.

  Therefore, according to the present Example, the surface which imitated the complicated surface structure of the living thing and plant which exists in nature can be reproduced to the product surface by a metal mold | die, without spending time and cost. Furthermore, the functionality which the surface structure of a living organism or a plant has can be sufficiently exhibited in a product produced from a mold. For example, a grip feeling due to unevenness of the shark skin can be used for a camera grip or the like. Moreover, since the height of the unevenness can be freely changed, durability against wear can be enhanced. As soon as the unevenness of the pattern is shallow, the unevenness of the surface is worn away and the surface becomes slippery. However, according to the present embodiment, the unevenness copied from the natural object can be clearly attached with the mold, so that it is difficult to wear and is resistant to aging. Moreover, even if it is not a uniform continuous pattern, a continuous pattern can be added to a curved surface or a three-dimensional object, and there is no restriction on the reproduction of the pattern, and the arrangement can be made freely. Since the data is digital, unlike corrosion, there is no failure, it can be produced with uniform quality, and loss of defective products can be prevented. Also, the delivery date is easy to read.

  In the image processing method according to the second embodiment of the present invention, the overall steps described above are common, and in the overall step 2, the first captured image captured by irradiating illumination light vertically on the subject is used. The second photographed image taken by illuminating the subject with the illumination light obliquely from the left direction or the right direction and the subject photographed with the illumination light from the symmetrical direction. The third photographed image is common in that it is synthesized after reverse gradation processing. The apparatus used is the same as that of the first embodiment, and the image processing method of the present embodiment fixes the subject in a state where the subject is standing, fixes the camera at a position in front of the subject, and captures the captured image to acquire the captured image. The second embodiment is common to the first embodiment in that it includes a photographing step to be performed and a processing step for processing the photographed image to generate three-dimensional data. The second embodiment is the same as the first embodiment except that the concave portion processing is performed instead of the convex portion processing of the first embodiment.

{Concave treatment}
FIG. 11 is a detailed flowchart of processing steps in the image processing method according to the second embodiment of the present invention. In the image processing method according to the second embodiment, the processing step is a processing step when the surface shape of the imaging target is a concave surface. In FIG. 11, each step is represented as steps 1 to 6 of the concave portion processing, and is distinguished from the overall steps 1 to 6 shown in FIG. 1 and steps 1 to 9 of the convex portion processing shown in FIG. 5. The reverse gradation process is step 2 of the recess process.

  In this embodiment, an exclusion calculation processing function for smoothing gradation while brightening the whole is used, and reverse gradation processing is performed to project the gradation directions of the second captured image and the third captured image. Reverts to the normal gradation direction, where the white depression is black. Thereafter, contrast calculation processing is performed, and the first captured image is superimposed to superimpose the contour.

(start)
The first captured image, the second captured image, and the third captured image are taken into the image processing apparatus, and image processing is started.

(Step 1)
Step 1 of the concave processing is changing the color mode. Specifically, the convex portion processing step 1 is a gray scale step in which the first photographed image, the second photographed image, and the third photographed image are gray scales, respectively. In order to make it easy to recognize the color value after overlapping the images, the color mode of each image is changed from “RGB” to “Grayscale”.

(Step 2)
Step 2 of the recess processing is exclusion calculation processing (gradation direction correction). This step is a reverse gradation processing step in the case where the subject has a dent (dent), and the second and third photographic images that have undergone the gray scale step are dented while the entire image is brightened. It is a process of superimposing by the exclusion calculation process to correct the gradation.

  FIG. 12 is an explanatory diagram illustrating exclusion calculation processing in the image processing method according to the second embodiment of the present invention. The left image (“upper image”) in FIG. 12 is an image obtained by irradiating illumination light from the right side of the subject and rotated 90 degrees clockwise. “Lower image”) is an image obtained by rotating illumination 90 degrees clockwise, taken by illuminating illumination light from the left side of the subject. In FIG. 12, the lower image (“superimposed image”) is an image obtained by superimposing the “upper image” and the “lower image” in the exclusion calculation process. In the exclusion calculation process, the composite color is removed from the basic color based on the color information in each channel, or the basic color is removed from the composite color. If the smaller color is removed from the color with the larger brightness value and combined with white, the value of the basic color is inverted. This effect corrects the dent gradation.

  In the example of FIG. 12, at the locations A and B, the gray scale value in the upper image (the image irradiated with illumination light from the right direction rotated 90 degrees clockwise) is 59%, and the lower image ( The gray scale value in an image illuminated with illumination light from the right direction rotated 90 degrees clockwise is 4%. As a result of subtracting the brightness value of the lower image from the upper image, the composite color becomes brighter. At locations C and D, the grayscale value in the upper image is 27% and the grayscale value in the lower image is 11%. As a result of subtracting the value of the dark upper image from the bright lower image, the composite color becomes black with the contrast reversed.

(Step 3)
In step 3 of the recess processing, after step 2 is completed, it is confirmed whether the gradation of the superimposed images is uniform as a whole. If the gradation is uniform, the process proceeds to step 4, and if not, step 2 is performed. This is a determination step returning to step S2.

(Step 4)
Step 4 of the recess processing is partial brightness / contrast processing by selection. Specifically, the area other than the dent is brightened and the gradation is smoothed. By brightening such a part, it is avoided that the part which is not recessed is expressed more dent than the part which is recessed.

  Prior to performing this process, the superimposed images are combined. In the partial brightness / contrast processing by selection, a place other than the recessed portion is selected, and the image is brightened with a contrast tool such as exposure amount processing. After that, smooth the gradation with blur (surface) and blur tool.

(Step 5)
Step 5 of the recess processing is contour superimposition and correction / contour creation processing. Specifically, the first photographed image obtained by irradiating the subject with illumination light vertically is processed by superimposing the second photographed image and the third photographed image, and further combining them. The image is superimposed on the image and combined after adjusting brightness and contrast to create a contour.

  Superimpose the front-illuminated image on the edited image, perform processing such as brightness and contrast, and combine the images to draw an outline. For processing such as brightness and contrast, a blurring tool or the like is used. The first photographed image is superimposed on top by multiplication processing, and brightness / contrast processing is performed. FIG. 13 is an explanatory diagram of a contour creation process in the image processing method according to the second embodiment of the present invention. In this step, after brightness / contrast processing, the outline is drawn with the boundary line tool.

  In this embodiment, since the subject has a dent, the outside of the boundary line is white.

(End)
After completing steps 1 to 6 of the recess processing, the image processing is terminated. FIG. 14 is a diagram illustrating a composite image after completion of image processing according to the second embodiment of the present invention. The surface condition of the subject is shown in detail with gradation from white to black.

{After image processing}
FIG. 15 is a cutting image diagram using the image processing method according to the second embodiment of the present invention. After completing Step 2 in the overall flow, that is, processing of a surface image obtained by digitizing and digitizing an image obtained by photographing a subject that uses the shape for mold processing, the entire Step 3 to Step 3 The point which carries out 6 and commercializes is the same as Example 1. FIG. 15 is an image of cutting by ArtCAM, and it can be seen that according to the present embodiment, it is possible to accurately reproduce even the dents on the surface of the subject and fine details in the inclined portions.

  In FIG. 14, the outer side of the boundary line is black (lowest), the inner side is white (highest), and the concave part gradually becomes black toward the most concave part in the center. The height at the boundary line is set to plus or minus 0, and this is set as the highest part, and the two-dimensional coordinate data inside the boundary line and gradation data (grayscale ratio data) from white to black corresponding to each coordinate data are displayed. In 15, gradation data is converted into height data to become three-dimensional data. The arrangement data creation, CAD / CAM dropping, and die design / cutting are the same as those described in the first embodiment.

{effect}
According to the image processing method of the present embodiment, it is possible to easily reproduce even a fine, irregular, and complex surface shape, and to freely arrange the vertical and horizontal lengths, height differences, and ratios of individual shapes. .

  According to the image processing method of the present embodiment, as described in the effect of the first embodiment, the problem at the time of photographing is solved, and the time and cost of image processing are not required, and an irregular and complicated surface can be reproduced. It can be used for various situations, and free surface processing can be realized.

  In the present embodiment, although the center is the deepest dent, there is a way to form a dent that appears as a deep dent near the periphery of the center, or even if the white-out part is a dent, It is possible to prevent the dent from appearing as a bulge, and even if the dent has the same depth, the depth of the dent differs depending on the contrast.

  Further, according to the mold processing method using the image processed by the image processing method of the present embodiment, the surface pattern that reproduces even a fine, irregular and complicated surface shape, or the vertical and horizontal lengths and height differences of individual shapes. And a mold capable of continuously applying a surface pattern to the product with their ratios freely arranged.

  The image processing method according to the third embodiment of the present invention is a gradation processing method for a surface in which peaks and dents are combined. The entire steps described above are common, and in the entire step 2, the first captured image that is captured by irradiating the subject with illumination light perpendicularly is obliquely tilted leftward or rightward with respect to the subject. The second photographed image taken by irradiating the illumination light and the third photographed image obtained by irradiating the subject with the illumination light from the symmetrical direction are subjected to inverse gradation processing. In addition, they are common in terms of synthesis. The apparatus used is the same as that of the first embodiment, and the image processing method of the present embodiment fixes the subject in a state where the subject is standing, fixes the camera at a position in front of the subject, and captures the captured image to acquire the captured image. The second embodiment is common to the first embodiment in that it includes a photographing step to be performed and a processing step for processing the photographed image to generate three-dimensional data. The convex / concave portion processing is performed instead of the convex portion processing according to the first embodiment, but the convex / concave portion processing is performed instead of step 8 (combination of images) and step 9 (correction / contour creation) of the convex portion processing according to the first embodiment. Except for performing steps 1 to 3 of the convex / concave overlapping portion processing, the processing is common to the convex portion processing of the first embodiment.

{Convex recess treatment}
FIG. 16 is a detailed flowchart of processing steps in the image processing method according to the third embodiment of the present invention. In the image processing method according to the third embodiment, the processing step is a processing step when the surface shape of the imaging target is a bulge and has a dent at the top. In this embodiment, the processed images of peaks and depressions are superimposed and corrected by partial erasure.

  FIG. 17 is a diagram illustrating (a) a schematic diagram of a shadow appearing on a subject by illumination light, and (b) an example of an image of a corresponding portion. In FIG. 17, the shark skin used in the wasabi grater is the subject. The surface of the shark skin is not simply lined with bulges, but has dents at the tops of the bulges, and the presence of the dents scrapes the material that slides on the surface (for example, wasabi). However, it has been difficult to reproduce such a fine structure with the conventional method.

  In FIG. 16, steps that are not common to the first embodiment are shown as steps 1 to 3 of the convex / concave overlapping portion processing, and are combined with steps 1 to 7 of the convex portion processing that are common to the first embodiment shown in FIG. 5.

  In the present embodiment, reverse gradation processing is performed in the same manner as in the first embodiment to return the gradation directions of the second captured image and the third captured image to the normal gradation direction. Thereafter, contrast calculation processing is performed, and the first captured image is superimposed to superimpose the contour. After that, with respect to the recessed portions, the gradation processed images are superimposed after the recessed portions are adjusted to a certain height, and after being corrected by partial erasing, they are combined. Description of parts common to the first embodiment is omitted.

{Processing of bumps and bumps}
(Step 1)
Step 1 of the convex / concave overlapping portion processing is a duplication of a pinlight calculation processing image and a gradation tool processing. Specifically, an image obtained by superimposing the second photographed image and the third photographed image in the pin light calculation process in step 5 of the convex part process is duplicated, and thereafter, step 7 of the convex part process is performed. Select the dent in the superimposed image that has undergone the above processing, process it with the gradation tool, and at the same time, perform gradation tool processing that smoothes the gradation with blurring.

(Step 2)
Step 2 of the uneven overlapping portion processing is superimposition of duplicate images. Specifically, the processed duplicated image (step 7 of the convex / concave portion processing, step 7 of the convex / concave portion processing is performed while the image copied in step 1 of the convex / concave portion processing is processed while performing gradation inversion or exclusion calculation processing. Overlay the image that has been subjected to gradation processing on the superimposed image that has undergone the above processing. A multiplication operation may be combined with the inversion of gradation.

(Step 3)
Step 3 of the irregularity overlapping portion processing is partial deletion, image combination, and gradation processing using an eraser tool. More specifically, with the eraser tool or the like, the uppermost image, that is, the image overlaid in step 2 of the uneven overlapping portion processing, is erased except for the recessed portion, and matched with the overlaid image. FIG. 18 is an explanatory diagram showing a partial deletion process by the eraser tool in the image processing method according to the third embodiment of the present invention. In this embodiment, the central dent is left in the image, and the rest are erased. After that, the images are combined and the gradation is processed smoothly by processing such as blurring.

(End)
After completing steps 1 to 3 of the uneven overlapping portion processing, the image processing is terminated. FIG. 19 is a diagram illustrating a composite image after completion of image processing in Embodiment 1 of the present invention. The surface condition of the subject is shown in detail with gradation from white to black. In the swollen area, the vicinity of the border of the area is raised, but the inside is slightly recessed, which is expressed by gradation.

{After image processing}
FIG. 20 is a cutting image diagram using the image processing method according to the third embodiment of the present invention. After completing Step 2 in the overall flow, that is, processing of a surface image obtained by digitizing and digitizing an image obtained by photographing a subject that uses the shape for mold processing, the entire Step 3 to Step 3 The point which carries out 6 and commercializes is the same as Example 1. FIG. 15 is a cutting image by ArtCAM, and according to the present embodiment, it can be seen that the surface of the subject can be accurately reproduced even in the unevenness of the surface of the subject and the fine portions in the inclined portion.

  In FIG. 19, the outer side of the boundary line is black (lowest), the inner side is also black, and gradually becomes white (highest) toward the central convex portion. The height at the boundary line is set to plus or minus 0, and this is set as the highest part, and the two-dimensional coordinate data inside the boundary line and gradation data (grayscale ratio data) from white to black corresponding to each coordinate data are displayed. Reference numeral 20 denotes three-dimensional data obtained by converting gradation data into height data. And The arrangement data creation, CAD / CAM dropping, and die design / cutting are the same as those described in the first embodiment.

{effect}
According to the image processing method of the present embodiment, it is possible to easily reproduce even a fine, irregular, and complex surface shape, and to freely arrange the vertical and horizontal lengths, height differences, and ratios of individual shapes. .

  According to the image processing method of the present embodiment, as described in the effect of the first embodiment, the problem at the time of photographing is solved, and the time and cost of image processing are not required, and an irregular and complicated surface can be reproduced. It can be used for various situations, and free surface processing can be realized.

  In the present embodiment, as described in the effects of the first embodiment and the second embodiment, it is possible to prevent the uneven state from being displayed inaccurately.

  Further, according to the mold processing method using the image processed by the image processing method of the present embodiment, the surface pattern that reproduces even a fine, irregular and complicated surface shape, or the vertical and horizontal lengths and height differences of individual shapes. And a mold capable of continuously applying a surface pattern to the product with their ratios freely arranged.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

1 Illumination light 2 Subject 3 Camera

Claims (4)

A second photographed image obtained by irradiating the subject with illumination light obliquely in the left direction or the right direction to the first photographed image obtained by irradiating the subject with illumination light vertically and the subject On the other hand, the second photographed image is combined with a third photographed image that is photographed by irradiating illumination light from a symmetric direction and then subjected to inverse gradation processing and then combined. 2. The image processing method according to claim 1, wherein the second photographed image and the third photographed image each have an incident angle of illumination light of 30 degrees or more and 80 degrees or less. 3. The image processing method according to claim 1, wherein the subject is photographed in a state where a photographing surface is upright. 4. The method according to claim 1, wherein the inverse gradation process includes a step of superimposing the second photographed image and the third photographed image after correcting the gradation directions. 5. Image processing method.