JP2006086903A - Image forming apparatus, image forming method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lower the visibility under visible light of a latent image comprised in an image. <P>SOLUTION: This image forming apparatus comprises a visible image forming section 30 for acquiring a visible image, an invisible image forming section 40-1 for acquiring a dot image to be formed using a plurality of kinds of inks having optical properties different from one another, a camouflage image forming section 50-1 for acquiring a camouflage pattern, and a synthesis section 70-1 for performing predetermined image processing based on the visible image, the dot image, and the camouflage pattern. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image generation apparatus, an image generation method, and a program, and more particularly to a latent image embedded at the time of image generation.

  In order to ensure the originality of a printed material, there is a technique in which a latent image that can be identified only by light of a specific wavelength is included in the printed material. As specific examples of such a technique, Patent Document 1 discloses black (K) ink (monochromatic black) containing an infrared absorbing dye, cyan (C) and magenta (M) not containing an infrared absorbing dye. , By using properly black ink (process black) made with yellow (Y) primary color ink, as a copy restraint image including an invisible image that cannot be recognized unless a special appraisal device is used Techniques relating to printing are disclosed.

Since the copying machine cannot recognize the difference in infrared absorption, the latent image is not copied even if the copying check image is copied in the copying machine. For this reason, the latent image is not copied in the copied copy check image, and the copied copy check image and the original copy check image can be identified by the presence or absence of the latent image. The originality of the can be ensured.
JP 2003-136828 A

  However, in practice, there is a color difference between single color black and process black. For this reason, depending on the background image, the difference between monochrome black and process black can be confirmed by human eyes even under visible light, and a latent image may be acquired. If the latent image can be obtained, the copy check image including the latent image can be created by including the latent image in the copy check image, and there is a problem in securing the originality.

  The present invention has been made in view of the above-mentioned problems, and one of its purposes is an image generation device that makes it possible to reduce the visibility of a latent image included in an image under visible light, To provide an image generation method and program.

  In order to solve the above problems, the present invention provides an image acquisition unit that acquires a visible image and a halftone image acquisition unit that acquires a halftone image generated using a plurality of types of ink having different optical characteristics. And a camouflage pattern acquisition unit that acquires a camouflage pattern, and an image processing unit that performs predetermined image processing based on the visible image, the halftone dot image, and the camouflage pattern.

  In this way, since image processing can be performed based on the camouflage pattern, it is possible to reduce the visibility of the latent image included in the image under visible light.

  The image generation apparatus may further include a camouflage pattern use determining unit that determines whether to use the camouflage pattern in the predetermined image processing based on the flatness of the visible image. . In this case, the flatness may be determined according to the amount of edge components included in the visible image. In this way, image processing can be performed only on a visible image with high flatness.

  In the image generation device, the predetermined image processing is performed by changing the visible image according to the camouflage pattern, and further combining the changed visible image and the halftone image. It is also possible to generate a composite image. In this case, the processing for changing the visible image according to the camouflage pattern in the predetermined image processing is performed by changing the visible image by whitening the visible image according to the camouflage pattern. There may be.

  Further, in the image generating apparatus, the predetermined image processing is performed by performing predetermined changes on each halftone dot of the halftone image according to the camouflage pattern, and the halftone dot image, the camouflage pattern, And further, the synthesized image is generated by synthesizing the image obtained by the synthesis and the visible image.

  The image generation method according to the present invention includes an image acquisition step of acquiring a visible image, and a halftone image acquisition step of acquiring a halftone image generated using a plurality of types of ink having different optical characteristics. And a camouflage pattern acquiring step for acquiring a camouflage pattern, and an image processing step for performing predetermined image processing based on the visible image, the halftone dot image, and the camouflage pattern.

  Further, the program according to the present invention includes an image acquisition unit that acquires a visible image, a halftone image acquisition unit that acquires a halftone image generated using a plurality of types of ink having different optical characteristics, and a camouflage pattern. Is a program for causing a computer to function as a camouflage pattern acquisition unit that acquires image data, and an image processing unit that performs predetermined image processing based on the visible image, the halftone dot image, and the camouflage pattern.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a hardware configuration diagram of an image generation apparatus 10 according to the present embodiment. The image generation apparatus 10 includes a control device 12 and a printing device 14, and the printing device 14 is connected to the control device 12. The control device 12 is realized by using, for example, a computer, and performs image generation processing according to the present embodiment using information processing means such as a CPU and information storage means such as a main memory and a sub memory provided in the control device 12. Running. The image processing is preferably realized by executing a software program. The program is stored in an information storage unit, the program stored in the storage unit is read out by the information processing unit, and the read-out is performed. The image generation process is executed by executing the program. Further, the information processing means outputs output image data indicating an output image generated by synthesizing a forgery-preventing image generated as a result of the image generation processing to a document image such as an electronic document to the printing apparatus 14. The process to do is also performed.

  For example, a multifunction copying machine or a printer can be used as the printing apparatus 14. The printing device 14 may be configured integrally with the control device 12, or may be connected to the control device 12 through communication means such as a parallel cable or a local area network. Then, the output image data output from the control device 12 is expanded into raster data, and the raster data is printed. CMYK four color toners are used for printing. CMYK is yellow (Y), magenta (M), cyan (C), and black (K), respectively. The material of CMYK is different from that of K and the absorptance of infrared wavelength is increased. Keep it different.

  Hereinafter, the image generation processing in the present embodiment will be described.

  First, an example of an output image that is a printed matter generated in the image generation processing in the first embodiment will be described. FIG. 2 is a diagram showing (A) an output image, (B) a visible image, (C) an invisible image, and (D) a camouflage image in the main image generation process. The visible image in FIG. 2B is an image itself that is desired to prevent forgery. Here, a photo of a temple is taken as an example, but it is also preferable to use a public document such as a resident's card. The invisible image in FIG. 2C is composed of a black dot image. When printing each halftone dot, by selectively using either process black generated by synthesizing CMY according to the latent image or single color black (carbon black) consisting of only K, under visible light. Then, even with the same black color, the infrared wavelength absorptance of each halftone dot differs depending on the latent image, and the latent image appears to be lifted when viewed with infrared rays. Here, an example is shown in which the letter “F” is used as the latent image. As the camouflage image in FIG. 2D, an image that can hinder the visibility of the invisible image when it is combined with the invisible image is experimentally determined. In addition, although it is set as the repeating pattern of the same image here, it is not necessary to repeat.

  Then, predetermined image processing is performed by synthesizing the visible image, the invisible image, and the camouflage image, and the copy check image of FIG. 2A is generated. In FIG. 2A, for the sake of clarity, the halftone dots are shown as white circles, but in reality, the black halftone image shown in FIG. 2C is synthesized. When the copy check image is copied by a copying machine, the copying machine usually cannot identify infrared wavelengths, so the same toner is applied to both the part printed with process black and the part printed with monochrome black. As a result, the latent image is erased from the copy. In this way, the original and the copy can be distinguished. The same applies when scanned by a scanner.

  Further, since each halftone dot of the halftone image included in the copy check image is only black when viewed with human eyes, the human cannot recognize the latent image included in the output image. It should be. However, in actual printing, depending on the characteristics of the printing apparatus 14, there may be a slight color difference or density difference between carbon black and process black under visible light. In order to make it difficult for humans to recognize these subtle color differences and density differences, in this embodiment, when generating an output image, not only an invisible image is combined with a visible image but also a camouflage image is combined. I am going to do that.

  The image generation processing according to the present embodiment will be described in detail below. FIG. 3 is a diagram showing functional blocks provided for performing the image generation processing in the control device 12. As shown in the figure, the control device 12 includes an image analysis unit 20, a visible image generation unit 30, an invisible image generation unit 40-1, a camouflage image generation unit 50-1, a pattern storage unit 60, and a synthesis unit 70-1. Consists of including. Further, the visible image generation unit 30 includes a color conversion unit 32 and a dither processing unit 34, and the invisible image generation unit 40-1 includes a color conversion unit 42, a gradation correction unit 44, and a dither processing unit 46. The camouflage image generation unit 50-1 includes a pattern selection unit 52, a repetition processing unit 54, and a dither processing unit 56.

  The visible image generation unit 30 and the image analysis unit 20 are input with a pattern image. The pattern image is data obtained by imaging electronic data to be printed such as a picture, a figure, a character, or a table, and is generally an RGB full-color image that is an additive color mixture. In the visible image generation unit 30, the pattern image is input to the color conversion unit 32. The color conversion unit 32 converts the color space from RGB to CMY, which is a subtractive color mixture. The pattern image converted into CMY by the color conversion unit 32 is input to the dither processing unit 34, and pseudo halftone generation processing is performed. For more specific dither processing, it is preferable to use dither processing with a relatively high number of lines of about 200 lines, line screen processing, error diffusion processing, or the like as the dither processing. Then, the pattern image (visible image) subjected to the pseudo halftone generation process is output to the synthesis unit 70-1.

  Further, in the image analysis unit 20, whether or not the inputted pattern image is an image that makes the latent image easy to see with human eyes when the latent image is combined with the pattern image. Judging. That is, the above-described subtle color difference and density difference between carbon black and process black tend to be conspicuous in a flat portion in an image, in other words, a portion where the color does not change so much depending on the position. Therefore, for example, by detecting a portion where the color difference from an adjacent pixel is equal to or less than a predetermined value, it is determined whether or not such a portion is included. More specifically, the pattern image is divided into blocks of a predetermined size, and edge components are extracted for each block. For the extraction of edge components, for example, neighboring pixel difference processing can be used. Then, it is determined whether or not the extracted edge component is larger than a predetermined threshold, and it is determined that the block whose edge component is larger than the threshold is not flat. On the other hand, a block whose edge component is smaller than the threshold is determined to be flat. Then, the number of blocks determined to be not flat (the number of non-flat blocks) is counted and output to the synthesis unit 70-1.

  The invisible image generation unit 40-1 receives a latent image. The latent image is preferably a binary halftone image having a latent image portion and a background portion, the latent image portion having a pixel value of 1 and the background portion having a pixel value of 0. First, the latent image is input to the color conversion unit 42. Then, each of the binary values is converted into two colors on the CMYK space. The two colors are configured to be reproduced as the same color (gray color) having the same density when printed. More specifically, a halftone dot with a pixel value of 0 is converted to a process black consisting of CMY, and a halftone dot with a pixel value of 1 is converted to a monochrome black consisting of only K or a process black consisting of CMYK containing K. Is preferred.

  Then, the latent image image color-converted by the color conversion unit 42 is input to the gradation correction unit 44 and is subjected to gradation correction so as to have the same color and density when printed. Although it is difficult to make process black and single color black or process black containing K and process black containing K exactly the same color and density due to the characteristics of the printing device 14 and ink material, the same color as much as possible It is preferable to adjust in advance according to the characteristics of the printing apparatus 14 and the ink material so as to approach the density. The latent image whose gradation has been corrected is input to the dither processing unit 46 and subjected to pseudo halftone generation processing. More specifically, dithering with a relatively low number of lines, such as about 130 lines, can be used. Then, the latent image (invisible image) subjected to the pseudo halftone generation process is output to the synthesis unit 70-1.

  It is preferable that the latent image and the pattern image have the same size. However, when either one is small, the smaller image may be stretched or the larger image may be compressed. Further, when the latent image is small, the latent image may be the same size as the pattern image by repeatedly arranging the latent image based on a predetermined rule.

  The camouflage image generation unit 50-1 receives a pattern number that is a number associated with the camouflage pattern. Then, the pattern selection unit 52 reads a camouflage pattern image from the pattern storage unit 60 based on the pattern number. That is, the pattern storage unit 60 stores a camouflage pattern image in association with the pattern number. As will be described later, it is preferable that the camouflage pattern image has a smaller size than the pattern image so that a plurality of camouflage pattern images can be repeatedly arranged on the pattern image. The camouflage pattern image is preferably an image made of CMY. Furthermore, the camouflage pattern image has an appropriate pattern that does not affect the distinguishability of the pattern image when combined with the pattern image, makes the latent image less noticeable, and prevents the latent image from being acquired. Remember. For example, the camouflage pattern image may be a low-density image or a translucent image.

  Then, the pattern selection unit 52 inputs the selected pattern image to the repetition processing unit 54, and the repetition processing unit 54 repeatedly arranges the camouflage pattern images, so that a pattern usually made up of a plurality of camouflage pattern images. A camouflage image that is the same size as the image is generated.

  Then, the camouflage image is input to the dither processing unit 56, and pseudo halftone generation processing is performed. More specifically, it is preferable to use dither processing with a relatively high number of lines of about 200 lines, line screen processing, error diffusion processing, or the like as the dither processing. Then, the camouflage image after the pseudo halftone generation process is output to the synthesis unit 70-1.

  The synthesizing unit 70-1 includes a visible image input from the visible image generating unit 30, an invisible image input from the invisible image generating unit 40-1, and a camouflage according to the number of non-flat blocks input from the image analyzing unit 20. By synthesizing the camouflage image input from the image generation unit 50-1, output image data is acquired and output to the printing apparatus 14 is performed. That is, when the number of non-flat blocks is higher than a threshold value stored in advance, an image obtained by combining a visible image and an invisible image is used as output image data, and a camouflaged image is not combined. On the other hand, when the number of non-flat blocks is lower than a threshold value stored in advance, the visible image, the invisible image, and the camouflage image are synthesized. In this way, the camouflage image is synthesized only when the latent image is conspicuous in the pattern image.

A specific synthesis process in the synthesis unit 70-1 is as follows. In the synthesis process, a logical sum synthesis process is performed for each color component of the image to be synthesized. That is, each image is an image in the CMYK color space, and the color of each pixel is determined by determining what percentage of the toner is used for each toner. Then, C 1, M, Y, and K of image a are used by a ₁ %, a ₂ %, a ₃ %, and a ₄ %, respectively, and C, M, Y, and K of image b are b ₁ % and b ₂ , respectively. %, B ₃ %, and b ₄ % are used, C, M, Y, and K of the image color obtained by combining the image a and the image b are a ₁ + b ₁ %, a ₂ + b ₂ %, a ₃ + B ₃ %, a ₄ + b ₄ % are used. Note that the ratio of toner used for each color is referred to as toner usage rate. In this embodiment, since the visible image and the camouflage image are made of CMY, K is 0%. Of the halftone dots of the invisible image, the latent image portion has K of n% (n> 0), and the background portion has K of 0%. For this reason, even after composition, the ratio of monochromatic black in the halftone dot portion of the invisible image is n% (n> 0) in the latent image portion and 0% in the background portion, and infrared absorption between the latent image portion and the background portion is performed. The difference in rate is kept.

  The output image data generated as described above is printed with the toner corresponding to the color associated with each pixel in the printing device 14. In this way, a copy check image, which is a printed matter, is generated by the image generation processing of the present embodiment.

  The example of the camouflage pattern synthetic | combination image produced | generated in the image production | generation process in 2nd Embodiment is shown. FIG. 4 is a diagram illustrating a camouflage pattern composite image in the main image generation process. In the present embodiment, the camouflage pattern image is the same as that in the first embodiment, but is configured to be whitened according to the camouflage pattern image when synthesized with the visible image.

  Then, the invisible image similar to that of the first embodiment is synthesized with the camouflage pattern synthesized image to perform predetermined image processing, and a copy restraint image including a latent image composed of halftone dots having different infrared absorption rates is generated. .

  Hereinafter, the image generation processing according to the present embodiment will be described in detail. FIG. 5 is a diagram illustrating functional blocks provided for the control device 12 to perform the image generation processing. As shown in the figure, the control device 12 includes an image analysis unit 20, a visible image generation unit 30, an invisible image generation unit 40-1, a camouflage image generation unit 50-1, a pattern storage unit 60, a synthesis unit 70-2, It is configured to include a white synthesis unit 80. Further, the visible image generation unit 30 includes a color conversion unit 32 and a dither processing unit 34, and the invisible image generation unit 40-1 includes a color conversion unit 42, a gradation correction unit 44, and a dither processing unit 46. The camouflage image generation unit 50-1 includes a pattern selection unit 52, a repetition processing unit 54, and a dither processing unit 56.

  The visible image generation unit 30, the invisible image generation unit 40-1, the camouflage image generation unit 50-1, the processing in the image analysis unit 20 and the camouflage pattern image stored in the pattern storage unit 60 are the same as those in the first embodiment. The output destination of the output data (visible image, camouflage image, number of non-flat blocks) of the visible image generation unit 30, the camouflage image generation unit 50-1, and the image analysis unit 20 is an outline synthesis unit 80, and the invisible image generation unit 40- The output destination of the output data of 1 is the synthesis unit 70-2.

  The outline synthesis unit 80 synthesizes the visible image input from the visible image generation unit 30 and the camouflage image input from the camouflage image generation unit 50-1 according to the number of non-flat blocks input from the image analysis unit 20. By doing this, the camouflage pattern synthesized image is acquired and processed to be output to the synthesizing unit 70-2. That is, when the number of non-flat blocks is higher than a threshold value stored in advance, the camouflage image is not synthesized and the visible image is output as it is to the synthesizing unit 70-2 as a camouflage pattern synthesized image. On the other hand, when the number of non-flat blocks is lower than a threshold value stored in advance, the visible image and the camouflage image are synthesized. In this way, the camouflage image is synthesized only when the latent image is conspicuous in the pattern image.

  The specific synthesis process in the outline synthesis unit 80 is as follows. First, among the pixels of the camouflage image to which the color composed of CMY is associated, any of C, M, and Y is a pixel of 0, that is, for a white pixel, one of the pixel values of 1, C, M, and Y A pixel value of 0 is associated with a non-zero pixel, that is, a colored pixel (non-white pixel). Then, for each color component of each pixel of the visible image, an AND operation process for multiplying the pixel value is performed. Then, among the pixels of the camouflage image, the toner usage rate is 0% in all of C, M, and Y for the pixel associated with the pixel value 0, that is, the pixel of the camouflage pattern composite image corresponding to the colored pixel. . That is, it turns white. In this way, the whiteout synthesis unit 80 generates a camouflage pattern composite image that is a whitened image according to the camouflage image.

  The synthesizing unit 70-2 synthesizes the camouflage pattern synthesized image and the invisible image. In this case, a logical sum synthesis process similar to that in the first embodiment is performed. For this reason, even after composition, the ratio of monochrome black in the halftone dot portion of the invisible image is n% (n> 0) in the latent image portion and 0% in the background portion, and infrared absorption between the latent image portion and the background portion is performed. The difference in rate is kept. The synthesizing unit 70-2 performs a process of acquiring the output image data by synthesizing the camouflage pattern synthesized image and the invisible image, and outputting the output image data to the printing apparatus 14.

  The output image data generated as described above is printed with the toner corresponding to the color associated with each pixel in the printing device 14. In this way, a copy check image, which is a printed matter, is generated by the image generation processing of the present embodiment.

  The example of the invisible image produced | generated in the image production | generation process in 3rd Embodiment is shown. FIG. 6 is a diagram illustrating an invisible image in the main image generation process. In this embodiment, the latent image and the camouflage pattern image are the same as those in the first embodiment, but the latent image is a halftone image. When generating an invisible image, the size of each halftone dot is changed according to the camouflage pattern image.

  Then, a predetermined image process is performed by combining the invisible image with the visible image similar to that of the first embodiment, and a copy check image including a latent image composed of halftone dots having different infrared absorption rates is generated.

  Hereinafter, the image generation processing according to the present embodiment will be described in detail. FIG. 7 is a diagram showing functional blocks provided for performing the image generation process in the control device 12. As shown in the figure, the control device 12 includes an image analysis unit 20, a visible image generation unit 30, an invisible image generation unit 40-2, a camouflage image generation unit 50-2, a pattern storage unit 60, and a synthesis unit 70-3. Consists of including. Further, the visible image generation unit 30 includes a color conversion unit 32 and a dither processing unit 34, and the invisible image generation unit 40-2 includes a color conversion unit 42, a gradation correction unit 44, and a dither processing unit 46. The camouflage image generation unit 50-2 includes a pattern selection unit 52 and a repetition processing unit 54.

  The processing in the visible image generation unit 30 and the image analysis unit 20 and the camouflage pattern image stored in the pattern storage unit 60 are the same as those in the first embodiment, but the output data (visible image) of the visible image generation unit 30 and the image analysis unit 20 ) Is the synthesis unit 70-3. The output destination of the output data (the number of non-flat blocks) of the image analysis unit 20 is the gradation modulation unit 45.

  The processing in the color conversion unit 42, gradation correction unit 44, dither processing unit 46, pattern selection unit 52, and repetition processing unit 54 is the same as that in the first embodiment, but the output data of the invisible image generation unit 40-2. The output destination of the output data (invisible image) of the dither processing unit 46 is the synthesis unit 70-3, and the output destination of the output data of the repetition processing unit 54 is the gradation modulation unit 45.

  The gradation modulation unit 45 outputs the latent image whose gradation has been corrected output from the gradation correction unit 44 and the repetition processing unit 54 according to the number of non-flat blocks input from the image analysis unit 20. The latent image is modulated based on the camouflage image. Specifically, when the number of non-flat blocks is higher than a threshold value stored in advance, the pixel value of each pixel of the camouflage image is added to each pixel of the latent image for each color component, thereby Modulation.

  Then, the gradation modulation unit 45 outputs the latent image image thus modulated to the dither processing unit 46. On the other hand, if the number of non-flat blocks is lower than the threshold value stored in advance, the modulation processing is not performed, and the latent image whose gradation has been corrected is output to the dither processing unit 46 as it is.

  Then, the dither processing unit 46 performs pseudo halftone generation processing similar to that of the first embodiment on the input latent image, and the latent image (invisible image) subjected to the pseudo halftone generation processing is combined with the synthesis unit 70- 3 is output.

  The synthesizing unit 70-3 synthesizes the invisible image and the visible image. In this case, a logical sum synthesis process similar to that in the first embodiment is performed. For this reason, even after composition, the ratio of monochrome black in the halftone dot portion of the invisible image is n% (n> 0) in the latent image portion and 0% in the background portion, and infrared absorption between the latent image portion and the background portion is performed. The difference in rate is kept. The synthesizing unit 70-2 performs a process of acquiring the output image data by synthesizing the camouflage pattern synthesized image and the invisible image, and outputting the output image data to the printing apparatus 14.

  The output image data generated as described above is printed with the toner corresponding to the color associated with each pixel in the printing device 14. In this way, a copy check image, which is a printed matter, is generated by the image generation processing of the present embodiment.

  By doing so, the visibility of the latent image contained in the copy check image under visible light can be reduced. That is, since the camouflage image diffuses human attention, the camouflage image can be made inconspicuous. Furthermore, since the camouflage image can be synthesized according to the flatness of the pattern image, the camouflage image can be synthesized only when necessary, that is, only with a conspicuous pattern image.

It is a block diagram which shows the structure of the image processing system concerning embodiment of this invention. It is the output image, visible image, invisible image, and camouflage image concerning embodiment of this invention. It is a functional block diagram for image generation processing concerning an embodiment of the invention. It is a camouflage pattern synthetic | combination image concerning embodiment of this invention. It is a functional block diagram for image generation processing concerning an embodiment of the invention. It is an invisible image concerning an embodiment of the invention. It is a functional block diagram for image generation processing concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image generation apparatus, 12 Control apparatus, 14 Printing apparatus, 20 Image analysis part, 30 Visible image generation part, 32 Color conversion part, 34 Dither processing part, 40 Invisible image generation part, 42 Color conversion part, 44 Gradation correction part , 45 gradation modulation unit, 46, 56 dither processing unit, 50 camouflage image generation unit, 52 pattern selection unit, 54 repetition processing unit, 60 pattern storage unit, 70 synthesis unit, 80 outline synthesis unit.

Claims (8)

An image acquisition means for acquiring a visible image;
Halftone dot image acquisition means for acquiring a halftone dot image generated using a plurality of types of ink having different optical characteristics;
Camouflage pattern acquisition means for acquiring a camouflage pattern;
Image processing means for performing predetermined image processing based on the visible image, the halftone dot image, and the camouflage pattern;
An image generation apparatus comprising: The image generation apparatus according to claim 1,
Camouflage pattern use determining means for determining whether to use the camouflage pattern in the predetermined image processing based on the flatness of the visible image;
An image generating apparatus further comprising: The image generation apparatus according to claim 2,
The flatness is determined according to the amount of edge components included in the visible image.
An image generation apparatus characterized by that. The image generation apparatus according to claim 1,
The predetermined image processing changes the visible image according to the camouflage pattern,
Furthermore, the synthesized image is generated by synthesizing the changed visible image and the halftone image.
An image generation apparatus characterized by that. The image generation apparatus according to claim 4,
The process of changing the visible image according to the camouflage pattern in the predetermined image processing is changing the visible image by whitening the visible image according to the camouflage pattern.
An image generation apparatus characterized by that. The image generation apparatus according to claim 1,
The predetermined image processing combines the halftone image and the camouflage pattern by making a predetermined change in accordance with the camouflage pattern for each halftone dot of the halftone image.
Furthermore, it is to generate the synthesized image by synthesizing the image obtained by the synthesis and the visible image.
An image generation apparatus characterized by that. An image acquisition step for acquiring a visible image;
A halftone image acquisition step of acquiring a halftone image generated using a plurality of types of ink having different optical characteristics;
A camouflage pattern acquisition step for acquiring a camouflage pattern;
An image processing step for performing predetermined image processing based on the visible image, the halftone dot image, and the camouflage pattern;
An image generation method comprising: Image acquisition means for acquiring a visible image;
A halftone image obtaining means for obtaining a halftone image generated using a plurality of types of ink having different optical characteristics;
Camouflage pattern acquisition means for acquiring a camouflage pattern, and
Image processing means for performing predetermined image processing based on the visible image, the halftone dot image, and the camouflage pattern;
As a program to make the computer function.

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