JP4132122B2 - Printed matter, discriminating tool, image forming method, and copy discrimination method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printed matter, a discrimination tool, an image forming method, and a copy discrimination method.
[0002]
[Background Art and Problems to be Solved by the Invention]
In general, an image is formed on a printed material by an area modulation method. An object of the present invention is to provide a printed matter on which an image is formed by a phase modulation method.
[0003]
[Means for Solving the Problems]
In order to achieve the above-described object, the first invention reads the original image related to the first image and the original image related to the second image, and the number of dots in the vertical direction is I and the number of dots in the horizontal direction is J. The size of the original image related to the first image and the size of the original image related to the second image are adjusted to the size corresponding to I × J dots, the number of gradations N is determined, and gradation thinning is performed. , By changing the image to an N-gradation image, the gradations of the first image and the second image are calculated, and a plurality of small areas are arranged in a grid by I vertically and J horizontally. Then, the position of the origin set for each small area is set as the position of the lower left corner of each small area, the horizontal displacement from the origin is the first displacement, and the vertical displacement from the origin is the second. Corresponding to the gradation of the corresponding dot of the first image as the displacement amount of the first displacement. And a value corresponding to the gradation of the corresponding dot of the second image is set as the displacement amount of the second displacement, and the position specified by the first displacement and the second displacement. The printed matter in which a small pattern having a width that is half the width of the small region is formed in the vertical and horizontal directions, and the width of the small region and the interval between the lines are the same. Using a discriminator that is half the width of a small area and overlaying the discriminator on the printed matter, the first image is formed, and the discriminator is rotated 90 degrees on the printed matter. The image forming method is characterized in that the second image is formed when combined.
The second invention is a printed material used in the image forming method of the first invention, wherein the original image related to the first image and the original image related to the second image are read, and the number of dots in the vertical direction is set to I The size of the original image related to the first image and the size of the original image related to the second image is adjusted to the size corresponding to I × J dots, and the number of gradations N Is calculated, and the gradation of the first image and the second image is calculated by changing the images to N gradation images, respectively. J pieces are arranged side by side in a lattice shape, and the position of the origin set for each small area is set as the position of the lower left corner point of each small area, the lateral displacement from the origin is the first displacement, and the origin The vertical displacement from the second displacement is the second displacement, and the displacement of the first displacement is the correspondence of the first image. A value corresponding to the gradation of the corresponding dot of the second image is set as a displacement amount of the second displacement, and a value corresponding to the gradation of the corresponding dot of the second image is set. This is a printed matter in which a small pattern having a width that is half the width of the small region is formed vertically and horizontally at the position specified by the second displacement.
According to a third aspect of the present invention, the original image related to the first image and the original image related to the second image are read, and the number of dots in the vertical direction is I and the number of dots in the horizontal direction is J. The size of the original image and the size of the original image related to the second image are adjusted to the size corresponding to I × J dots, the number of gradations N is determined, gradation gradation is thinned out, and an image of N gradations is obtained. By changing, the gradation of the first image and the second image is calculated, and a plurality of small areas are arranged in a lattice form with I pieces arranged vertically and J pieces arranged horizontally. The position of the origin to be set is the position of the lower left corner point of each small region, the horizontal displacement from the origin is the first displacement, the vertical displacement from the origin is the second displacement, As the displacement amount of the displacement, a value corresponding to the gradation of the corresponding dot of the first image is set, and the second displacement A value corresponding to the gradation of the corresponding dot of the second image is set as the scale amount, and the small area is vertically and horizontally positioned at the position specified by the first displacement and the second displacement, respectively. The printed matter in which a small pattern having a width of half of the width is formed, and the width of the small area is the same as the interval of the line, and the line width of the line is half of the width of the small area. When the discriminating tool is superimposed on the printed material, the first image or the second image is formed, and when the discriminating tool is superimposed on a copy of the printed material, the first image or According to another aspect of the present invention, there is provided a method for discriminating a printed matter, wherein the printed matter and the copied matter are discriminated when a second image is not formed.
[0004]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic explanatory diagram of an embodiment of the present invention. When the discriminator 3 is placed on the printed matter 1, the first image can be seen. Further, when the discriminator 3 is rotated 90 degrees, the second image can be seen.
[0005]
FIG. 2 is a diagram illustrating a pattern formed on the printed material 1. FIG. 3 is an enlarged view of the small region 5. As shown in FIG. 2, many small patterns 9 are formed on the printed material 1. In FIG. 2, reference numeral 7 denotes a grid line. However, the grid line 7 is added for convenience, and such a grid line is not formed in an actual printed matter. Due to the lattice lines 7, small areas (cells) 5 are formed on the printed material 1, and small patterns 9 are formed in the small areas 5.
[0006]
As shown in FIG. 3, the small pattern 9 is formed by a phase modulation method. When the lower left corner point 13 of the small area 5 is the origin and the coordinates (x, y) of the lower left corner point 11 of the small pattern 9 are the first image embedded in the displacement x and the second image in the displacement y. Embed.
[0007]
FIG. 4 shows the pattern of the discriminator 3. FIG. 5 is a view showing the discriminator 3 rotated by 90 degrees.
FIG. 6 shows a case where the discrimination tool 3 shown in FIG. 4 is superimposed on the printed matter 1 shown in FIG. At this time, for example, an image of Mt. Fuji (first image) is formed as shown in FIG. That is, when a person puts the discriminator 3 on the printed material 1 and looks at the printed material 1, he can see an image of Mt. Fuji.
[0008]
FIG. 8 shows a case where the discrimination tool 3 rotated 90 degrees as shown in FIG. 5 is superimposed on the printed matter 1 shown in FIG. At this time, an apple image (second image) is formed as shown in FIG. That is, when a person puts the discriminator 3 on the printed matter 1 and looks at the printed matter 1, an image of an apple can be seen.
[0009]
As described above, the first image is formed with the discriminating tool 3 superimposed on the printed material 1, and the second image is formed with the discriminating tool 3 rotated 90 degrees on the printed material 1. As described above, the small pattern 9 is embedded in the printed matter 1 in advance.
That is, in the printed matter 1 shown in FIG. 2, when the discriminator 3 is placed on the printed matter 1, the first image is formed, and when the discriminator 3 rotated 90 degrees is placed, the second image is formed. Thus, the position of each small pattern 9 is determined.
[0010]
Thus, in the present embodiment, different images can be formed when the discriminator 3 is placed on the printed matter 1 and when the discriminator 3 is rotated 90 degrees.
[0011]
Next, a method for creating the small pattern 9 will be described more specifically. FIG. 10 shows 16 small regions 15-1, 15-2,..., 15-16 formed on the printed matter 1 when the small pattern 9 is created by the four-tone gradation modulation method. FIG. When the first image and the second image embedded in the printed material 1 are created with four gradations, the small area (cell) 5 in FIG. 2 is divided into 8 × 8 areas, and the floor of each small area is divided. The key takes a value from “0” to “3”. Depending on the gradation of the first image and the gradation of the second image, any 4 × 4 region of the 8 × 8 region is used. Is made black and the other areas are white.
[0012]
FIG. 11 shows a case where the discriminating tool 3 is superimposed in the vertical direction in FIG. In this case, only the gradation information of the first image appears in each of the small areas 15-1, 15-2,..., 15-16.
[0013]
Small areas 15-1, 15-5, 15-9, and 15-13 have "0" gradation, and small areas 15-2, 15-6, 15-10, and 15-14 have "1" gradation and small areas 15-3, 15-7, 15-11, and 15-15 have “2” gradation, and the small areas 15-4, 15-8, 15-12, and 15-16 have “3” gradation.
[0014]
FIG. 12 shows a case where the discriminating tool 3 is overlapped in the horizontal direction in FIG. In this case, only the gradation information of the second image appears in each of the small regions 15-1, 15-2, ..., 15-16.
[0015]
Small areas 15-1, 15-2, 15-3, and 15-4 have “0” gradation, and small areas 15-5, 15-6, 15-7, and 15-8 have “1” gradation and small areas 15-9, 15-10, 15-11, and 15-12 have “2” gradation, and the small areas 15-13, 15-14, 15-15, and 15-16 have “3” gradation.
[0016]
Next, with reference to FIGS. 13 and 14, the process of creating the printed material 1 that forms the first image and the second image with N gradations will be described in more detail. FIG. 13 is a flowchart showing a process for creating the printed material 1 and the discriminator 3. First, an original image is input. For example, the scanner reads a first image (for example, an image of Mt. Fuji shown in FIG. 7) and a second image (for example, an image of an apple shown in FIG. 9) (step 101). Next, the size of the original image is adjusted. That is, it is checked whether or not the sizes of the first image and the second image match (step 102). If the sizes are correct, no processing is performed. If the sizes are different, the sizes of the first image and the second image are adjusted by processing such as enlargement, reduction, cropping, and pasting of the images. .
[0017]
Next, based on the first image and the second image, an output image as shown in FIG. 2 is created (step 103), and the discriminator 3 is created based on the first image and the second image. (Step 104). Then, the image is saved and output. That is, the output image and the discriminating tool 3 are stored in a storage device and output by an output device such as an image setter (step 105).
[0018]
FIG. 14 is a flowchart showing the process of step 103. Based on FIG. 14, the process of step 103 of FIG. 13 will be described in detail. First, the sizes (IxJ) of the first image and the second image are matched (step 201). Here, as shown in FIG. 2, I is the number of dots in the vertical direction, and J is the number of dots in the horizontal direction. Next, the gradation number N is determined (step 202), gradation thinning is performed, and the first image and the second image are changed to N gradation images (step 203). Then, the coordinates (x, y) = (i, j) of the created image are set, and “0” is given to the initial values of i and j (step 204).
[0019]
Next, a small region (cell) 5 having a coordinate value (x, y) = (i, j) is created. That is, the first image is embedded in the displacement amount x as shown in FIG. 3, and the second image is embedded in the displacement amount y (step 205). Next, it is determined whether i is equal to I (step 206). If i is not equal to I, i = i + 1 is substituted (step 207), and the process of step 205 is performed until i becomes equal to I. repeat. If i is equal to I in step 206, the image creating unit determines whether j is equal to J (step 208). If j is not equal to J, i = 0 and j = j + 1 are replaced. (Step 207), the process of step 205 and after is repeated until j becomes equal to J. If j is equal to J in step 208, the process is terminated.
[0020]
In the embodiment described above, the small pattern 9 is a square, but may be a circle or other shapes. That is, the pattern of the printed material 1 and the discriminating tool 3 is such that different images are formed when the discriminating tool 3 is placed on the printed material 1 and when the discriminating tool 3 is rotated 90 degrees and placed on the printed material 1. Any pattern may be used.
[0021]
Moreover, the printed matter 1 shown in FIG. 2 can also be used for preventing forgery. FIG. 15 shows a pattern when the printed material 1 shown in FIG. 2 is copied by a copying machine. For example, a pattern as shown in FIG. 2 is embedded in a predetermined area of a printed matter such as a gold note, a security, or a commuter pass. When the discriminating tool 3 is placed in this area, a predetermined image can be seen. In this case, two types of images are formed depending on the direction of the discriminator 3.
[0022]
However, if the pattern shown in FIG. 2 is created in a size that cannot be reproduced by a copying machine, and the printed material such as a built-in commuter pass is copied, the pattern in the predetermined area is regarded as an image with a constant density, and line modulation is performed. Therefore, since it becomes as shown in FIG. 15, even if the discriminator 3 is placed thereon, a predetermined image cannot be seen. Therefore, by placing the discriminating tool 3 in a predetermined area such as a commuter pass, it can be discriminated whether it is an original commuter pass or a copy.
[0023]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a printed matter on which an image is formed by the phase modulation method.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram of the present embodiment. FIG. 2 is a diagram showing a pattern of a printed material. FIG. 3 is a diagram showing a small area. FIG. 4 is a diagram showing a discriminator. FIG. 6 is a diagram showing the discriminating tool 3 that has been moved. FIG. 6 is an explanatory diagram when the discriminating tool 3 shown in FIG. 4 is placed on the printed matter 1. FIG. 7 is a diagram showing the image of FIG. FIG. 9 is a diagram showing the image of FIG. 8. FIG. 10 is formed on the printed material 1 when the first image and the second image are created with four gradations. FIG. 11 is a diagram showing 16 small regions 15-1, 15-2,..., 15-16 that may be displayed. FIG. 11 is an explanatory diagram when the discriminator 3 is placed in the vertical direction in FIG. FIG. 12 is an explanatory diagram when the discriminating tool 3 is placed in the horizontal direction in FIG. It shows the pattern of the flow chart FIG. 15 of copies printed matter 1 shown in FIG. 2 showing a third process [Description of symbols]
1 ... Printed material 3 ... Discriminators 5 and 15 ... Small area 9 ... Small pattern

Claims (3)

The original image related to the first image and the second image are read, and the number of dots in the vertical direction is I and the number of dots in the horizontal direction is J. By adjusting the size of the original image related to the image to the size corresponding to I × J dots, determining the number of gradations N, performing gradation thinning, and changing the images to N gradations, respectively. Calculating the gradation of the first image and the second image;
A plurality of small areas are arranged in a grid with I vertically and J horizontally, and the position of the origin set for each small area is the position of the lower left corner point of each small area, and the horizontal direction from the origin The first displacement is the first displacement, the displacement in the vertical direction from the origin is the second displacement, and the displacement amount of the first displacement is a value corresponding to the gradation of the corresponding dot of the first image. And a value corresponding to the gradation of the corresponding dot of the second image is set as the displacement amount of the second displacement, and the position specified by the first displacement and the second displacement is set. A printed matter in which a small pattern having a width of one half of the width of the small region is formed vertically and horizontally ;
Using a discriminator in which the width of the small region is the same as the interval of the line, and the line width of the line is half the width of the small region,
The first image is formed when the discriminator is overlaid on the printed matter, and the second image is formed when the discriminator is rotated 90 degrees on the printed matter and superimposed. Forming method. A printed material used in the image forming method according to claim 1,
The original image related to the first image and the second image are read, and the number of dots in the vertical direction is I and the number of dots in the horizontal direction is J. By adjusting the size of the original image related to the image to the size corresponding to I × J dots, determining the number of gradations N, performing gradation thinning, and changing the images to N gradations, respectively. Calculating the gradation of the first image and the second image;
A plurality of small areas are arranged in a grid with I vertically and J horizontally, and the position of the origin set for each small area is the position of the lower left corner point of each small area, and the horizontal direction from the origin The first displacement is the first displacement, the displacement in the vertical direction from the origin is the second displacement, and the displacement amount of the first displacement is a value corresponding to the gradation of the corresponding dot of the first image. And a value corresponding to the gradation of the corresponding dot of the second image is set as the displacement amount of the second displacement, and the position specified by the first displacement and the second displacement is set. printed material to form a small pattern having a first width-half of each width of said small regions vertically and horizontally. The original image related to the first image and the second image are read, and the number of dots in the vertical direction is I and the number of dots in the horizontal direction is J. By adjusting the size of the original image related to the image to the size corresponding to I × J dots, determining the number of gradations N, performing gradation thinning, and changing the images to N gradations, respectively. Calculating the gradation of the first image and the second image;
A plurality of small areas are arranged in a grid with I vertically and J horizontally, and the position of the origin set for each small area is the position of the lower left corner point of each small area, and the horizontal direction from the origin The first displacement is the first displacement, the displacement in the vertical direction from the origin is the second displacement, and the displacement amount of the first displacement is a value corresponding to the gradation of the corresponding dot of the first image. And a value corresponding to the gradation of the corresponding dot of the second image is set as the displacement amount of the second displacement, and the position specified by the first displacement and the second displacement is set. A printed matter in which a small pattern having a width of one half of the width of the small region is formed vertically and horizontally ;
Using a discriminator in which the width of the small region is the same as the interval of the line, and the line width of the line is half the width of the small region,
When the discriminator is overlaid on the printed matter, the first image or the second image is formed. When the discriminator is overlaid on a copy of the printed matter, the first image or the second image is not formed. A method for discriminating a printed material from a printed material and a copied material.

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