JP4289263B2 - Image generating apparatus, image generating method, program, and storage medium - Google Patents

Description

  The present invention relates to an image generation apparatus, an image generation method, a program, and a storage medium, and more particularly to a latent image that is embedded when generating an image.

Conventionally, a technique for printing coded information such as a barcode on a printed material in order to trace the distribution route of the printed material, and a pattern that can be read as “COPY” when copying, for example, to prohibit copying. A technique relating to a copy check image in which a latent image that appears is embedded in a printed material is known. Patent Document 1 discloses a technique that makes it possible to implement both of these techniques on one copy check image. In the technique disclosed in Patent Document 1, the coded information is included in either the latent image portion or the background portion, so that the coded information can be copied, but the latent image is revealed by copying. It is possible to make it.
JP 2001-346032 A

  However, in the above conventional technique, for example, when coded information is included only in the background portion, if the pattern to be embedded as a latent image becomes large, the area in which the coded information is included becomes narrow, and one copy restraint. There has been a problem that the amount of data that can be included in an image is reduced. Similarly, when coding information is included in the latent image portion, if the pattern embedded as the latent image is small, the area in which the coding information is included becomes narrow and the amount of data is reduced. It was.

  The present invention has been made in view of the above problems, and one of its purposes is an image generation apparatus and an image generation device that can increase the amount of coded information included in an image including a latent image. A method, a program, and a storage medium are provided.

  An image generation apparatus according to the present invention for solving the above-described problem is an image including a latent image portion and a background portion, both of which include coded information, and is copied to the latent image portion. An image including a composite pattern formed by synthesizing the lost pattern at the time of copying and the first pattern at the time of copying remaining after copying, which is the first remaining pattern at the time of copying indicating the encoded information, is generated. Image generating means.

  By doing so, since the coded information can be included in both the latent image portion and the background portion, it is possible to increase the data amount of the coded information included in the image including the latent image.

  Further, in the image generating apparatus, a second copy remaining pattern that remains in the background portion when copied and is different from the first copy remaining pattern, and that indicates encoded information. It is good also as including the residual pattern at the time of copying.

  In the image generating apparatus, the latent image portion may be configured to include a composite pattern area including the composite pattern and a copy disappearance pattern area including the copy disappearance pattern. In this way, the contrast between the latent image portion and the background portion can be improved.

  In the image generating apparatus, at least a part of the coded information is a synchronization code for the reading device to identify the position of the coded information when the reading device reads the coded information. The coding information indicated by the first copy remaining pattern that constitutes the synthesis pattern that constitutes the synthesis pattern area may include at least the synchronization code.

  In the image generating apparatus, the latent image portion may include the composite pattern region only in a region that is a predetermined distance away from a boundary between the latent image portion and the background portion.

  In the image generation apparatus, the composite pattern and the second copy remaining pattern are configured such that the density of the latent image portion and the background portion when the image is printed is the same. As good as In this way, since the density of the latent image portion and the background portion are the same, it is difficult to distinguish the two portions when viewed with the human eye. In this case, the latent image portion and the background portion when the image is printed by configuring the composite pattern and the second copy remaining pattern to have the same pixel density. It is good also as being comprised so that the density | concentration of may become the same.

  Further, the medium according to the present invention includes a latent image portion and a background portion, an image including coded information in both portions, and an erasure pattern at the time of copying that disappears when copied to the latent image portion. An image including a composite pattern formed by combining the first copy residual pattern remaining after copying and the first copy residual pattern indicating the coded information is recorded.

  The image generation method according to the present invention is an image including a latent image portion and a background portion, including encoded information in both portions, and disappearing when copying to the latent image portion. Generating an image including a combined pattern obtained by combining the pattern and the first remaining pattern at the time of copying that remains after copying, and the first remaining pattern at the time of copying indicating the coded information .

  Further, a program according to the present invention includes a latent image portion and a background portion, an image including coded information in both portions, and an erasure pattern at the time of copying that disappears when copied to the latent image portion. A computer serving as an image generating means for generating an image including a composite pattern which is a first copy residual pattern remaining after copying and is composed of a first copy residual pattern indicating coded information; It is made to function.

  A computer-readable storage medium according to the present invention includes an image portion including a latent image portion and a background portion and includes coded information in both portions, and is lost when copied to the latent image portion. Image generation for generating an image including a composite pattern formed by combining the disappearance pattern at the time of copying and the first remaining pattern at the time of copying that remains after copying, and the first remaining pattern at the time of copying indicating the coded information As a means, a program for causing a computer to function is stored.

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

  FIG. 1 is a functional block diagram of an image generation apparatus 1 according to an embodiment of the present invention. The image generation apparatus 1 may be, for example, a multifunction machine including a printing unit, or may be a computer that is configured to print an image generated by a printer that can communicate with the computer. In the following description, it is assumed that the image generation apparatus 1 is a multi-function peripheral, and receives document data described in PDL (Page Description Language) from an external computer via a network and performs processing described later.

  As shown in FIG. 1, the image generation apparatus 1 includes a print data input unit 10, a document image generation unit 12, a document image buffer 14, an image composition unit 16, an image formation unit 18, an additional information extraction unit 20, and a latent image generation unit. 22, an additional information encoding unit 24, a pattern image generation unit 26, a pattern storage unit 28, and a pattern image buffer 30.

  The print data input unit 10 is connected to a network (not shown), and document data (PDL data) described in PDL is input as a print job from another computer connected to the network. In the header part of the PDL data, the IP (Internet Protocol) address of the computer that sent the print job, the user name (computer name) that sent the print job, the document file name of the document data, the PDL data The date and time of creation (time stamp), the confidential level set in the document file, the coded information in which information such as the password set in the document file is encoded, and a latent image embedded in the PDL data by the processing described later The latent image character string is added as additional information. These additional information may not be added to all PDL data, and may be added only to confidential documents that need to be prohibited from being copied, for example. The latent image character string may be a latent image original image. The print data input unit 10 outputs the PDL data to the document image generation unit 12 and the additional information extraction unit 20.

  The document image generation unit 12 rasterizes the input PDL data and generates a document image that is raster data. The document image is stored by temporarily storing it in the document image buffer 14.

  The additional information extraction unit 20 extracts additional information added to the header part included in the input PDL data. Then, of the extracted additional information, the latent image character string is output to the latent image generation unit 22, and the encoded information is output to the additional information encoding unit 24.

  The additional information extracting unit 20 has not extracted the additional information when the additional information added to the header part included in the input PDL data is not extracted, for example, when the additional information is not added. May be output to the latent image generation unit 22, the additional information encoding unit 24, the pattern image generation unit 26, and the image synthesis unit 16. In this case, processing described later in the latent image generation unit 22, the additional information encoding unit 24, the pattern image generation unit 26, and the image composition unit 16 is not performed, and an output image described later is a document image itself.

  The latent image generation unit 22 rasterizes the input latent image character string using a predetermined font selected from fonts stored in a font storage unit (not shown), and is converted into a binary image. Is generated. In this case, the latent image may include a plurality of latent image character strings at predetermined positions. Further, as the predetermined font to be used, it is preferable to use a relatively large font of 48 points, for example. The size of the font is selected for the purpose of ensuring the visibility of the latent image in the copy of the copy check image. When a latent image original image is input instead of the latent image character string, the latent image original image is raster-developed to generate a binary image. Then, the latent image is output to the additional information encoding unit 24.

It should be noted that the resolution of the latent image indicated by the latent image generated by the latent image generator 22 is preferably determined by the following equations (1) and (2).
Latent image resolution = printer resolution / number of horizontal pixels of the pattern (1)
Number of vertical and horizontal pixels of the latent image = number of vertical and horizontal pixels of the document image ÷ number of horizontal pixels of the pattern (2)

  More specifically, for example, when the printer resolution is 600 dpi, the number of horizontal pixels of a pattern to be described later is 12 pixels, and the number of vertical and horizontal pixels of the document image indicated by the document image is 4960 × 7015 pixels, the resolution of the latent image Is 50 dpi, and the number of vertical × horizontal pixels is 413 × 584 pixels. That is, one pixel of the latent image is set so as to correspond to one size of a pattern described later.

  The additional information encoding unit 24 receives the encoded information and the latent image. Then, the input coded information is subjected to error correction coding. Further, the encoded information subjected to the error correction encoding is subjected to code conversion according to the input latent image, so that each element of the array is “0”, “1”, “2”, “3”. A two-dimensional array in which any of the above is associated is generated. Details of the two-dimensional array and the two-dimensional array generation processing for generating the two-dimensional array will be described later. Then, the generated two-dimensional array and latent image are output to the pattern image generator 26.

  Next, the pattern image generation unit 26 selects a pattern corresponding to the values of the elements constituting the two-dimensional array from the plurality of patterns stored in the pattern storage unit 28. Details of the pattern and the pattern selection process for selecting the pattern will be described later. Then, an image is generated with the selected pattern to be a pattern image indicating the image, and the pattern image is temporarily stored in the pattern image buffer 30. This pattern image generation process will also be described later.

  The image composition unit 16 generates an output image based on the document image stored in the document image buffer 14 and the pattern image stored in the pattern image buffer 30. Specifically, an output image can be generated by superimposing a pattern image on a document image. This output image generation process will also be described later.

  Then, the output image is output to the image forming unit 18, and the image forming unit 18 prints out the image indicated by the output image to obtain a copy check image. Here, the image forming unit 18 is configured to include a printer equipped with a printer engine and capable of printing a document image on a paper medium. When the image generating apparatus 1 is a computer and printing is performed by a printer that can communicate with the computer, the image forming unit 18 may be provided in the printer.

  The two-dimensional array, the two-dimensional array generation process, the pattern, the pattern selection process, the pattern image generation process, and the output image generation process according to the first embodiment will be described in detail.

  First, the two-dimensional array and the two-dimensional array generation process will be described. The encoded information subjected to error correction coding is a bit string. The bit string is read bit by bit, and the read bit string is rearranged into a two-dimensional array (unit two-dimensional array) having a predetermined size. The outermost peripheral bits of the unit two-dimensional array are all bit 1 in order to facilitate positioning and clipping of the encoded information image when the encoded information image included in the copy check image is read by the reading device. Has been. An example of this is shown in FIG.

  Then, the unit two-dimensional array is repeatedly arranged in the vertical and horizontal directions to obtain a two-dimensional array having a size (413 rows and 584 columns) corresponding to the number of vertical and horizontal pixels (413 × 584 pixels) of the latent image. In this case, if it is not exactly 413 rows and 584 columns depending on the information amount of the coded information, the remaining portion may be filled with bit 0, and the last data of repetition may be included halfway. .

  Then, the value corresponding to each element of the two-dimensional array is changed according to the value corresponding to each dot of the latent image. That is, when a dot in a latent image that is a binary image is black, 2 is added to the bit associated with the corresponding element of the two-dimensional array. On the other hand, when a dot in the latent image that is a binary image is white, 0 is added to the bit associated with the corresponding dot in the intermediate two-dimensional array. By making the intermediate two-dimensional array obtained in this way the above-described two-dimensional array, a two-dimensional array can be generated.

  Next, patterns, pattern selection processing, pattern image generation processing, and output image generation processing will be described. In the pattern selection process, “0”, “1”, “2”, and “3” are associated with each array element of the two-dimensional array in which a predetermined value is added to the element as described above. The pattern image generation unit 26 selects a pattern according to each. An example of the pattern selected in this case is shown in FIG. For example, FIG. 2A is an array element “0”, FIG. 2B is an array element “1”, FIG. 2C is an array element “2”, and FIG. 2D is an array element “3”. Can be associated. Then, an image in which patterns corresponding to the respective array elements of the two-dimensional array are arranged according to the order of the array elements of the two-dimensional array is generated as a pattern image. More specifically, a pattern image can be generated by writing to a corresponding position in the pattern image buffer. Further, by doing as described above, the size of the pattern image and the document image can be made the same size.

  An example of a pattern image generated as described above is shown in FIG. In FIG. 3A, the latent image is generated as an image including three character strings “COPY” at the positions shown in FIG. FIG. 3C is an enlarged view of part of FIG. The pattern shown in FIG. 2 (C) or FIG. 2 (D) is arranged in the lower left part of the figure, and the pattern shown in FIG. 2 (A) or FIG. A pattern is placed. A portion where the pattern shown in FIG. 2 (C) or FIG. 2 (D) is arranged as a pattern is a portion where the dots of the latent image are black, and a pattern is shown in FIG. 2 (A) or FIG. 2 (B). The portion where the pattern is arranged is a portion where the dots of the latent image are white. That is, the character portion “COPY” in FIG. 3A is a portion where the pattern shown in FIG. 2C or FIG. 2D is arranged as a pattern.

  Each pattern is determined to have the same pixel density. That is, the pixel density is determined so that the white / black ratio is the same in each of the patterns (A) to (D) in FIG. Therefore, when the latent image is printed, each pattern is recognized as a gray image having the same density by human eyes. In FIG. 3A, for the sake of explanation, the black density of the character portion “COPY” is set to be higher than the other portions.

  2 (A) to 2 (D), FIG. 2 (A) is a straight line with a downward slope, FIG. 2 (B) is a straight pattern with a lift to the right, and FIG. A pattern in which isolated dots are arranged in a linear pattern and FIG. 2D is configured as a pattern in which isolated dots are arranged in a linear pattern rising to the right. That is, the downward-sloping pattern corresponds to “0” and “2” in the two-dimensional array, and the upward-sloping pattern corresponds to “1” and “3” in the two-dimensional array. By doing so, the downward-sloping pattern and the upward-sloping pattern correspond to “0” and “1” of the encoded information subjected to error correction encoding, respectively, and the pattern included in the latent image is changed. By reading, the encoded information can be decoded. In this way, the coded information functions as machine readable code.

  Further, as described above, the outermost peripheral bits of the unit two-dimensional array are all set to 1. A specific example of this is shown in FIG. FIG. 4 shows a unit two-dimensional array in which the pattern of FIG. 2A is assigned when the element bit is “0”, and the pattern of FIG. 2B is assigned when the element bit is “1”. It is the figure which has arrange | positioned the element to the grid on a plane. In this way, when the pattern included in the latent image is read by the reading device, the reading device identifies the bit 1 continuously forming a square, thereby surrounding the square. It can be recognized that the obtained portion is one unit two-dimensional array. Hereinafter, the outermost peripheral bit is referred to as a synchronization code.

  The pattern image is combined with the document image in the image combining unit 16 to generate an output image. For the synthesis, for example, it is preferable to use a halftone dot image with each dot of the pattern image as a halftone dot, and to superimpose the halftone dot on the document image.

  FIG. 3B shows an image output when the generated output image is copied by a copying machine or read by a scanner. For the sake of explanation, it is assumed in FIG. 3B that the document image is white. FIG. 3D is an enlarged view of a portion corresponding to FIG.

  In FIG. 3B, the characters “COPY” are raised. That is, in the case where the output image is copied by a copying machine or read by a scanner, the density of the “COPY” character portion is lower than that of the other portions. The reason for this will be described below.

  The isolated dots included in the pattern shown in FIG. 2C or FIG. 2D are lost due to the optical characteristics and image processing of the copying machine or scanner when copied by a copying machine or read by a scanner. In other words, when an image of about one dot (about 42 microns) of 600 dpi is read with a general copying machine or scanner, the read image becomes a blurred low density image due to its optical characteristics, and image noise performed after reading is removed. As a result of this processing, the minute low-density image disappears. The pattern shown in FIG. 2 (C) or FIG. 2 (D) is copied with an isolated dot, which is an erasure pattern at the time of first copying, which disappears when copied by a copying machine or read by a scanner. In this case, it is a composite pattern formed by combining the linear pattern which is the remaining pattern at the time of first copying remaining when read by the scanner. For this reason, when the image is copied by a copying machine or read by a scanner, only a linear pattern remains, and the density is lower than that of the original output image. On the other hand, the pattern shown in FIG. 2 (A) or FIG. 2 (B) is composed of a straight line pattern which is a second remaining pattern at the time of copying when copied by a copying machine or read by a scanner. Does not include erasure pattern for 1 copy. The pattern shown in FIG. 2C or 2D and the pattern shown in FIG. 2A or 2B have the same pixel density. That is, the pixel density of the remaining pattern at the time of second copying is configured to be equal to the pixel density of the composite pattern. For this reason, the pixel density of the remaining pattern at the time of the second copying is higher than the pixel density of the remaining pattern at the time of the first copying, and the lost pattern at the time of the first copying disappears when copied by the copying machine or read by the scanner. The density of the portion (latent image portion) where the pattern shown in FIG. 2 (C) or FIG. 2 (D), which is a composite pattern, is printed is printed as the pattern shown in FIG. 2 (A) or FIG. 2 (B). It becomes lighter than the density of the area (background part).

  Note that the pixel density of the remaining pattern at the time of second copying may not be exactly equal to the pixel density of the composite pattern. That is, depending on the characteristics of the apparatus for printing, even if two images have the same pixel density, the density of the printed result may differ between an image including isolated dots and an image that does not. In order to avoid this, the pixel density is adjusted so that the latent image portion and the background portion have the same density in the print result of the output image.

  The remaining pattern at the time of the first copying, which is a linear pattern, remains in the composite pattern. FIG. 3D shows an example of this case. Therefore, the encoded information can be decoded by reading the pattern included in the output image.

  By doing as described above, it is possible to include coding information (machine-readable code) that has been subjected to error correction coding in both the latent image portion and the background portion, and the code included in the copy check image including the latent image. It becomes possible to increase the data amount of the conversion information. Since the amount of data increases, the same copy information can be included in one copy check image, so that the reading accuracy at the time of reading can be increased.

  Next, the two-dimensional array, the two-dimensional array generation process, the pattern, the pattern selection process, the pattern image generation process, and the output image generation process according to the second embodiment will be described in detail.

  In the second embodiment, the two-dimensional array, the two-dimensional array generation process, the pattern image generation process, and the output image generation process are the same as those in the first embodiment. In addition to the four patterns in FIG. 2, one pattern is further added to the pattern. An example of this is shown in FIG. FIG. 5 shows five types of patterns used in the present embodiment. 5A to 5D are the same patterns as those in FIGS. 2A to 2D. The pattern shown in FIG. 5E is composed only of isolated dots that are disappearance patterns during the second copying. The density (pixel density) of the disappearance pattern during the second copying is configured to be equal to the density (pixel density) of the remaining pattern during the second copying.

  In the pattern selection process, the pattern image generation unit 26 determines a portion of the latent image portion other than the portion that is the synchronization code included in the first embodiment. Then, a pattern shown in FIG. 5E is selected for a portion other than the portion that is the synchronization code. By doing so, the pattern image becomes as shown in FIG. That is, of the latent image portion, only the sync code portion is a composite pattern region in which the composite pattern is arranged, and the other portion is a copy-time erasure pattern region in which the second copy erasure pattern is arranged.

  FIG. 6B shows a result of copying the pattern image as an output image in the image composition unit 16 and printing the image in the image forming unit 18 or reading it with a scanner. It can be seen that the disappearance pattern during the second copying disappears in the latent image portion, and only the portion of the synchronization code remains.

  In this way, the latent image portion can include a portion that is a synchronization code in the coded information, and can improve the recognizability of the synchronization code by the reading device at the time of reading. The accuracy can be increased. Further, compared with the first embodiment, the contrast between the latent image portion and the background portion during copying can be increased.

  A two-dimensional array, a two-dimensional array generation process, a pattern, a pattern selection process, a pattern image generation process, and an output image generation process according to the third embodiment will be described in detail.

  Next, in the third embodiment, the pattern, the pattern selection process, the pattern image generation process, and the output image generation process are the same as those in the second embodiment.

  In the two-dimensional array of this embodiment, for example, as shown in FIG. 7A, only a part of the latent image becomes a composite pattern area where a composite pattern is arranged, and the remaining part has a disappearance pattern during the second copying. It is configured to be an erasure pattern area for copying. In the two-dimensional array generation processing for generating such a two-dimensional array, when each element of the two-dimensional array is changed according to the value corresponding to each dot of the latent image, the element corresponding to the black dot For the element, the element of the array is set to a value other than “0”, “1”, “2”, and “3”, for example, “4”, depending on the random number. Specifically, a random number is generated by random number generation means for each element, and is set to “4” when the random number is larger than a predetermined value, and not set to “4” when the random number is smaller. Then, in the pattern selection process, the pattern image generation unit 26 selects the second copy disappearance pattern for the value of the two-dimensional array (for example, “4”) corresponding to the element not including the bit string.

  A copy check image including the unit two-dimensional array generated in this way is as shown in FIG. A copy check image when the output image is copied or read by a scanner is as shown in FIG.

  In the present embodiment, compared with the first embodiment, the contrast between the latent image portion and the background portion during copying can be increased. Further, since the coded information that has been corrected and coded can be included in the latent image portion after increasing the contrast, a larger amount of coded information can be included in the copy check image than in the second embodiment.

  Next, a two-dimensional array, a two-dimensional array generation process, a pattern, a pattern selection process, a pattern image generation process, and an output image generation process according to the fourth embodiment will be described in detail.

  In the fourth embodiment, the pattern, the pattern selection process, the pattern image generation process, and the output image generation process are the same as those in the third embodiment.

  For example, as shown in FIG. 8A, the two-dimensional array of the present embodiment is a combined pattern region in which only a portion having a certain distance from the background portion of the latent image portion is a combined pattern region, and the rest The portion is configured to be a erasure pattern area at the time of copying where the erasure pattern at the time of second copying is arranged. In the two-dimensional array generation processing for generating such a two-dimensional array, when each element of the two-dimensional array is changed according to a value corresponding to each dot of the latent image, For the element corresponding to the black dot, the distance between the dot and the white dot closest to the dot is calculated, and it may or may not be set to “4” as in the third embodiment, depending on the distance. I will do it. Specifically, “4” is set when the distance is larger than a predetermined value, and “4” is not set when the distance is smaller. Then, in the pattern selection process, the pattern image generation unit 26 selects the second copy disappearance pattern for the value of the two-dimensional array (for example, “4”) corresponding to the element not including the bit string.

  A copy check image including the unit two-dimensional array generated in this way is as shown in FIG. Further, FIG. 8B shows an image when the copy check image is copied or read by a scanner. Further, FIG. 9 is an enlarged image of a portion near the character “COPY” included in the image when the copy check image is copied or read by the scanner. As shown in the figure, the composite pattern is arranged only in the latent image portion having a certain distance from the background portion, so that the character “COPY” is whitened, and more copied. The contrast between the latent image portion and the background portion can be increased.

It is a functional block diagram of the image generation device concerning an embodiment of the invention. It is a pattern concerning an embodiment of the invention. FIG. 6 is an image when the output image and the output image according to the embodiment of the present invention are copied or read by a scanner. It is explanatory drawing of the two-dimensional arrangement | sequence code information concerning embodiment of this invention. It is a pattern concerning an embodiment of the invention. FIG. 6 is an image when a pattern image and an output image according to an embodiment of the present invention are copied or read by a scanner. FIG. 6 is an image when a pattern image and an output image according to an embodiment of the present invention are copied or read by a scanner. FIG. 6 is an image when a pattern image and an output image according to an embodiment of the present invention are copied or read by a scanner. It is an image when the output image according to the embodiment of the present invention is copied or read by a scanner.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Image generation apparatus, 10 Print data input part, 12 Document image generation part, 14 Document image buffer, 16 Image composition part, 18 Image formation part, 20 Additional information extraction part, 22 Latent image generation part, 24 Additional information encoding part , 26 pattern image generation unit, 28 pattern storage unit, 30 pattern image buffer.

Claims (8)

An image generating device that includes a latent image portion and a background portion different from the latent image portion, and generates an image including coded information in both portions,
Wherein the latent image portion, the double Utsushisho loss pattern disappears when copied, remains when copying, so as not to overlap with the first mixed Utsushizan exist pattern corresponding to the coded coding information of information to be added synthesized comprising composite pattern to generate an image including the,
Generating a second copy residual pattern corresponding to the encoded information that is encoded when the information to be added is encoded in the background portion.
Image generating means configured to have a pixel density of the second copy remaining pattern higher than a pixel density of the first copy remaining pattern and substantially equal to a pixel density of the composite pattern ;
An image generation apparatus comprising: The latent image portion is configured to include a combined pattern region made of the synthetic pattern, and a double Utsushisho loss pattern region made of the double Utsushisho loss pattern, and
The image generating apparatus according to claim 1 . At least a part of the coded information is a synchronization code for the reader to identify the position of the coded information when the reader reads the coded information,
First coding information indicated by the double Utsushizan presence pattern constituting the synthetic pattern constituting the composite pattern region comprises at least the synchronization code,
The image generating apparatus according to claim 2 . The latent image portion includes a pre-Symbol synthetic pattern region in the predetermined distance away from the boundary between the latent image portion and the background portion region,
The image generating apparatus according to claim 2 . A medium including a latent image portion and a background portion different from the latent image portion, and an image including coded information in both portions,
Wherein the latent image portion, the double Utsushisho loss pattern disappears when copied, remains when copying, so as not to overlap with the first mixed Utsushizan exist pattern corresponding to the coded coding information of information to be added An image containing a composite pattern formed by combining
A second copy residual pattern corresponding to coded information obtained by coding the information to be added, which remains in the background portion when copied, is generated,
A medium on which an image configured to have a pixel density of the second copy remaining pattern higher than a pixel density of the first copy remaining pattern and substantially equal to a pixel density of the composite pattern . An image generation method for generating an image including a latent image portion and a background portion different from the latent image portion and including coded information in both portions,
The latent image portion, the double Utsushisho loss pattern disappears when copied, remains when copied, so as not to overlap the first mixed Utsushizan presence pattern showing a coded coding information of information to be added Generate an image containing a composite pattern that is composed ,
Generating a second copy residual pattern corresponding to the encoded information that is encoded when the information to be added is encoded in the background portion.
An image generating method , wherein the pixel density of the second copy remaining pattern is higher than the pixel density of the first copy remaining pattern and substantially equal to the pixel density of the composite pattern . A program for causing a computer to generate an image including a latent image portion and a background portion different from the latent image portion and including coded information in both portions,
The latent image portion, the double Utsushisho loss pattern disappears when copied, remains when copied, so as not to overlap the first mixed Utsushizan presence pattern showing a coded coding information of information to be added Generate an image containing a composite pattern that is composed ,
Generating a second copy residual pattern corresponding to the encoded information that is encoded when the information to be added is encoded in the background portion.
Image generating means configured to have a pixel density of the second copy remaining pattern higher than a pixel density of the first copy remaining pattern and substantially equal to a pixel density of the composite pattern ;
Program for causing the computer to function as a. A computer-readable storage medium that stores a program for causing a computer to generate an image that includes a latent image portion and a background portion different from the latent image portion and includes coded information in both portions,
The latent image portion, a multi Utsushisho loss pattern disappears when copied, remains when copied, so as not to overlap the first mixed Utsushizan presence pattern showing a coded coding information of information to be added Generate an image containing a composite pattern that is composed ,
Generating a second copy residual pattern corresponding to the encoded information that is encoded when the information to be added is encoded in the background portion.
Image generating means configured to have a pixel density of the second copy remaining pattern higher than a pixel density of the first copy remaining pattern and substantially equal to a pixel density of the composite pattern ;
Computer-readable storage medium storing a program for causing the computer to function as a.

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