JP2002262055A - Image processor and image processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processor that generates output image data from which an image with a latent image by a soft thin paper image (a specific copy counterfeit preventing image that is invisible to human eyes but a warning character or the like appears when subjected to copying by a copying machine) imbedded thereto can be obtained even when a document image is of any kind. SOLUTION: A synthesis section 2 adds soft thin paper image data stored in a soft thin paper image data storage section 3 after original image data received by an input section 1 to generate and provide an output of output image data. In the case of image drawing processing on the basis of the output image data generated in this way, even when there exists an area for white painting in original image data, since the soft thin paper image is drawn later, void in a latent image or the like is not caused and a similar output result to the case with using printed soft thin paper can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus and an image processing method for generating output image data described in a page description language for drawing an image in which a latent image appears during copying.

[0002]

2. Description of the Related Art Conventionally, a special copy forgery prevention sheet called cherry paper has been used to suppress unauthorized copying of confidential documents. Sakuragami is a sheet of paper on which a special pattern is printed in advance, which is invisible to human eyes, but reveals warning characters and the like that are hidden when copied by a copying machine. When the document printed on the cherry blossom paper is copied by a copier, warning characters such as "copy prohibited" appear prominently on the copy, so it is a psychological deterrent to the act of illegally copying. At the same time, it is possible to distinguish between the original and the copy.

FIG. 15 is an explanatory diagram of an example of a print pattern of cherry paper. FIG. 15A shows the entirety of the cherry paper. The “COPY” area shown in black in FIG. 15A is a latent image portion that appears when copying is performed by the copying machine, and the hatched area around the area is a background portion that disappears when copying is performed by the copying machine. is there. The latent image portion and the background portion are printed so that the apparent color and density are the same. Although not shown, a fine line drawing pattern generally called a camouflage pattern is generally included. The camouflage pattern has a lower density than the other areas, and disappears when copied by a copying machine. In some cases, a symbol mark of a company, a local government, or the like is printed on a part of the cherry paper. Such a mark is shown in FIG.
(A) shows a star-shaped figure.

FIG. 15B shows an enlarged view of a boundary portion between a latent image portion and a background portion (a broken circle portion in FIG. 15A). The latent image portion is configured by relatively sparsely arranging relatively large dots (dots having a low line number). Further, the background portion is configured by arranging relatively small dots (halftone dots having a high number of lines) relatively densely.

When a document manuscript printed on this cherry paper is copied by a copying machine, the halftone dots constituting the latent image portion are faithfully copied because they have a size and density resolvable by the copying machine. . However, the halftone dots constituting the background portion are not copied because the size cannot be resolved by the copying machine. Therefore, only the latent image pattern is embossed on the copy together with the document image printed on the cherry paper.
By utilizing this and embedding a warning character such as "forbidden copy" as a latent image in cherry blossom paper, a warning character such as "forbidden copy" appears prominently in a copy. As a result, unauthorized copying can be suppressed, and the original and the copy can be distinguished.

By the way, such cherry paper requires special printing in advance, and thus has a problem that the cost of the paper itself is higher than the paper used in a normal copying machine or printer. Further, when the design of the background pattern, logo, symbol mark, etc. is changed, it is necessary to start over from printing on the paper, and there is a problem that it takes time and costs. In addition, management costs are burdened on the user.

As a conventional technique for solving these problems,
For example, there is a digital recording device described in JP-A-7-231384. This digital recording device uses a CCD
When copying and recording the image data read by the above, the same effect as when using cherry paper with normal paper is obtained by superimposing dithered images with different warning character parts and background parts. It is trying to get. This technique is based on the assumption that a raster image is used for a document portion, a warning character portion, and a background portion. Therefore, it is necessary to store and access a large amount of data as mask data for selecting a warning character portion and a background portion, and there is a problem that a processing load is extremely large. Further, since the cherry blossom paper data is a raster image, there is a problem that the load when transmitting through a network is large.

For example, Japanese Patent Application No. 2000-334948.
Then, the image of the document is ORed (O) with the image of the cherry paper adjusted so that the density of the warning character portion and the background portion are common
Some are synthesized by R).

Further, in order to avoid handling a large amount of data as described above, for example, Japanese Patent Application No. 2000-209128.
In this regard, it has been considered to add image data for drawing a document image to image data for drawing a cherry paper image in a page description language. As a result, the data amount can be significantly reduced as compared with the raster data, and the load can be reduced even when transmitting, for example.

However, when a document image is drawn on a cherry paper image as in these techniques, for example, when a white box is overwritten and drawn as a part of the document image, the cherry paper image inside the box disappears, It will be white. Similarly, when the drawing of a background image is specified in a document image, there is a problem that the cherry paper image disappears as a whole document and the document does not become a document using cherry paper.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has an output capable of obtaining an image in which a latent image based on a cherry paper image is embedded, regardless of the document image. An object of the present invention is to provide an image processing apparatus and an image processing method for generating image data.

[0012]

According to the present invention, cherry paper image data for drawing a cherry paper image including a latent image is added after document image data for drawing a document image described in a page description language. Output image data is being generated. By adding cherry paper image data after the document image data in this way, the cherry paper image is drawn after the document image is drawn. Therefore, even when a white box or the like is drawn as a document image, it is possible to prevent a drawback that the inside of the box becomes white by drawing a cherry paper image thereafter.

In many cases, a cherry paper image is constructed by combining two images, such as a latent image portion and a background portion. However, when one is a first image and the other is a second image, The first image data for drawing the first image and the second image data for drawing the second image can be added after the original image data. Alternatively, cherry paper image data obtained by combining the first image and the second image may be added after the document image data. Further, when the original image data and the first image data are provided, the second image data may be added after that.

Further, by making the apparent densities of the first image and the second image substantially equal, the latent image can be made difficult to see. Therefore, the density of each image may be adjusted in advance. Alternatively, adjustment can be performed by separately adding adjustment image data.
In this case, the first image data can be added after the original image data, the adjustment image data can be added after that, and the second image data can be added. Alternatively, the first image data and the second image data can be added after the original image data, and the adjusted image data can be added after that.

The cherry paper image data can be composed of, for example, cherry paper image data that draws colored pixel portions constituting a cherry paper image including a latent image. Or,
Each of the partial areas can be composed of cherry paper image data that selectively renders either the first image or the second image that constitutes the cherry paper image including the latent image.

Further, the cherry-blossom paper image data, the first image data, the second image data, the adjusted image data, etc.
At least one of them may include image data of a description that repeats a pattern corresponding to each image. This makes it possible to reduce the amount of data.

[0017]

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is an input unit, 2 is a combining unit, and 3 is a cherry paper image data holding unit. The input unit 1 receives document image data for drawing a document image described in a page description language. After the original image data received by the input unit 1, the synthesizing unit 2 includes a cherry paper image data holding unit 3.
Is added, and output image data is generated and output. As to the cherry paper image data to be added, the first image data, the second image data, the adjusted image data, and the like can be added in a predetermined order as described later. The cherry paper image data holding unit 3 holds cherry paper image data. As the cherry paper image data, the first image data for drawing the first image constituting the cherry paper image and the second image data for drawing the second image can be held. Of these, one is often a latent image and the other is a background image, but any may be the first image and any may be the second image. Further, adjusted image data for adjusting the apparent density of the first image and the second image can be held.

The original image data received by the input unit 1 may include first image data for drawing a first image constituting a cherry-paper image. In this case, the cherry paper image data holding unit holds the second image data and the adjusted image data, and the synthesizing unit 2 adds the second image data and the adjusted image data after the original image data.

The cherry paper image data can be provided from outside each time. In that case, the configuration can be made without the cherry paper image data holding unit 3.

FIG. 2 is a diagram illustrating an example of a change in image data according to the embodiment of the present invention. For example, FIG.
As shown in (A), the input image data has headers and footers added above and below the original image data for actually rendering the original image. When such cherry blossom image data shown in FIG. 2B is combined with such image data, FIG.
As shown in (C), cherry-paper image data is added after the original image data, and output image data is generated and output by sandwiching the whole with a header and a footer.

FIG. 3 is a flowchart showing an example of the operation according to the embodiment of the present invention. Here, cherry paper image data is generated in advance and stored in the cherry paper image data storage unit 3. When the original image data is input to the input unit 1 in S11 and the original image data is acquired, the corresponding cherry paper image data is read from the cherry paper image data holding unit 3 in S12.

In step S13, a position in the document image data at which the cherry blossom image data read in step S12 is to be inserted is searched. For example, if the document image data is only one page, it is sufficient to insert it between the document image data and the footer as shown in FIG. Further, when the document image data of a plurality of pages is continuous, a break of a page which appears first from the search start position may be searched and set as the insertion position. Then, in S14, the cherry blossom paper image data read in S12 is inserted into the insertion position searched in S13.

In S15, it is determined whether or not the last page has been reached. If the last page has not been reached, the process returns to S13 with the search start position immediately after the insertion position. The insertion of paper image data is repeated. When the last page has been reached, the output image data generation processing ends. The image data generated in this way is shown in FIG.
The set of original image data and cherry paper image data shown in (C) is repeated for the number of pages, and becomes data having a structure in which a header and a footer are added to the beginning and end. FIG.
The example of (C) shows a case where the document image has only one page.

FIG. 4 is an explanatory diagram of a specific example of an image formed by output image data generated in one embodiment of the present invention. After the original image data for drawing the original image as shown in FIG. 4A, the cherry paper image data for drawing the cherry paper image as shown in FIG. 4B is added to output image data. The output image data generated as described above is subjected to a drawing process when it is output to, for example, a printer or a display, whereby an image as shown in FIG. 4C is obtained.

The original image shown in FIG. 4A has a portion surrounded by a frame. Even if image data in which the inside of this frame is painted white exists in the original image data,
Since the cherry paper image data is added after the original image data, the drawing of the cherry paper image is performed after such a frame is drawn. Therefore, as shown in FIG. 4C, it is possible to avoid the drawback that the cherry paper image is drawn in the frame and the inside of the frame is blank.

In the cherry paper image shown in FIG. 4B, for the sake of illustration, the latent image portion indicated as "AB" and the background portion are shown with different hatchings. For example, FIG. As described in (1), the screen is composed of halftone dots having different numbers of lines. However, when the images are actually formed, both are drawn so as to have apparently almost the same density.

The output image data is generated by adding cherry paper image data after the original image data as described above.
Since there are several methods for adding cherry paper image data, a representative example will be described below using a specific example of an image.

FIG. 5 shows a first example of a method of adding cherry paper image data.
It is explanatory drawing of the example of. In this example, the cherry paper image is
The image is composed of a first image shown in FIG. 5B and a second image shown in FIG. In this case, after the original image data for drawing the original image shown in FIG.
First image data for drawing the first image shown in (B) is added. The first image is realized by a method for expressing halftones such as halftone processing and error diffusion processing.

If the second image is drawn on the first image as it is, the density of the portion of the second image rises,
The density of the second image is different from that of the second image, and the latent image is conspicuous. Therefore, in order to equalize the density of the portion where the second image overlaps, FIG. The adjustment image data for drawing the adjustment image shown in ()) is added. In brief, the second image portion may be deleted from the first image by overwriting the first image shown in FIG. 5B with the adjustment image data shown in FIG. 5C. The deletion can be realized by designating a background color such as white and overwriting. Of course, in addition to erasure by drawing a white image, for example, when the density of the first image is higher than the density of the second image, the density is low so that the density becomes uniform when the second image is drawn. A density image may be written. As described above, a white image may be drawn in the adjustment image data, but in FIG. 5C, hatching different from the others is shown.

Finally, second image data for drawing the second image forming the cherry blossom paper shown in FIG. 5D is added. As a result, it is possible to obtain output image data for finally drawing an image to which cherry paper is added as shown in FIG.

In the case of this example, it is realized by a method in which a character is designated as a region as the second image and halftone is expressed in the same manner as in the first image. However, the present invention is not limited to this, and an area other than characters may be designated as the second image. That is, the first image and the second image may be any of the latent image portion and the background portion, and in either case, the output image data may be generated in the same procedure, and the drawing may be performed at the time of drawing. There is no change. This is the same in each of the following examples.

FIG. 6 shows a second example of the method of adding cherry-blossom image data.
It is explanatory drawing of the example of. In this example, a case is shown in which input original image data includes first image data for drawing a first image that forms a cherry paper image. For example, the first image can be included in the document image as the background of the document image. When the original image data for drawing the original image including the first image is received, in order to make the density of the portion where the second image overlaps in the first image uniform, FIG. The adjustment image data for drawing the adjustment image shown in B) is added to the document image data. The adjustment image shown in FIG. 6B is the same as the one shown in FIG. 5C described above. After that, second image data for drawing the second image forming the sakura paper shown in FIG. 6C is added. This makes it possible to obtain output image data for drawing an image to which cherry paper is finally added as shown in FIG.

FIG. 7 shows a third example of the method of adding cherry paper image data.
It is explanatory drawing of the example of. In the above-described first and second examples, an example has been described in which the second image is drawn after performing the density adjustment using the adjustment image on the first image included in the cherry paper image. As a modified example, in this example, the first image and the second image
2 illustrates an example in which the density adjustment is performed on the area of the second image (or the area of the first image) after the image is drawn.

After the original image data for rendering the original image as shown in FIG. 7A, the first image data for rendering the first image constituting the cherry paper image as shown in FIG. 7B , And second image data for drawing the second image forming the cherry paper as shown in FIG. 7C.
If this is left as it is, the density will increase in the portion where the first image and the second image overlap. Therefore, the adjustment image data for drawing the adjustment image shown in FIG. 7D is added to the original image data so that the density of the portion where the second image overlaps in the first image is equalized. This adjusted image is
Any image may be used as long as the portion where the colored pixels of the first image do not exist and the portion where the colored pixels of the first image exist are deleted.

As described above, the first image and the second image are drawn on the original image, and the adjustment image for adjusting the density is drawn, so that the density of the latent image portion and the density of the background portion can be equalized. As a result, output image data in which a final image as shown in FIG. 7E is drawn can be obtained.

FIG. 8 shows a fourth example of the method of adding cherry paper image data.
It is explanatory drawing of the example of. In this example, when the first image and the second image constituting the cherry paper image are drawn, the first image and the second image are so set that the densities of the latent image portion and the background portion are substantially equal. Has been adjusted. In this example, in the first image shown in FIG. 8B, the area where the second image is drawn is shown in white, but an image having a certain density may be drawn. Of course, the first image and the second image may be reversed.

In this example, since the densities of the first image and the second image are adjusted in advance, there is no need to use the adjusted image. Therefore, first image data for drawing the first image shown in FIG. 8B is added after document image data for drawing the document image shown in FIG. 8A. Further, a second image for drawing the second image shown in FIG.
May be added. As a result, FIG.
It is possible to obtain output image data for finally drawing an image to which cherry paper is added as shown in (D).

FIG. 9 shows a fifth example of the method of adding cherry-blossom paper image data.
It is explanatory drawing of the example of. In the above-described example, an example has been described in which the first image data and the second image data for drawing the first image and the second image constituting the cherry paper image are prepared. In this example, a cherry paper image shown in FIG. 9D is drawn by superimposing the first image shown in FIG. 9B and the second image shown in FIG. Is created in advance.

In the case of this example, after the original image data for drawing the original image shown in FIG. 9A, the cherry paper image data for drawing the cherry paper image shown in FIG. 9D is added. I just need. As a result, output image data for finally drawing an image with cherry paper added as shown in FIG. 9E can be obtained.

Next, several examples of a method for drawing a cherry paper image using cherry paper image data will be described. Figure 1
0 is the first method of drawing cherry blossom paper images using cherry blossom paper image data
It is explanatory drawing of the example of. As shown in FIG. 15B, the cherry paper image is constituted by halftone dots having different numbers of lines.
Therefore, by drawing each of the dots constituting the halftone dot, a cherry paper image can be formed. The black dots shown in FIG.
It represents a halftone dot to be drawn by image data. However, actually, each point to be drawn has a size that cannot be apparently recognized as a point, and is extremely exaggerated in FIG.

For the points to be drawn in the cherry paper image, for example, a previously created cherry paper image is scanned, and image data to be drawn according to the size of the point is generated for a portion where a colored pixel to be drawn exists. I just need to do it. The drawing of a point can be represented as a line segment having a certain line width and length, for example, or can be realized by an arbitrary drawing object such as a rectangle or a circle. By using a repetition command as described later, the number of drawing commands can be significantly reduced.

In FIG. 10, the whole cherry paper image is drawn as if it were uniformly drawn with dots. For example, as described above, the image data is generated by separating the image into the first image and the second image. May be. Further, adjustment image data may be prepared as needed. The thus-generated cherry paper image data (or the first image data and the second image data, and further, the adjusted image data) is converted to the original image data as shown in FIGS. What is necessary is just to add it later and generate output image data.

FIG. 11 is an explanatory diagram of a second example of a method for drawing a cherry paper image using cherry paper image data. In this example, an example is shown in which a cherry paper image is divided by a graphic as shown by a bold line and configured by a combination of the graphics. For each figure, image data may be generated so as to draw either the first image or the second image. For example, in the example shown in FIG. 11A, the area where the first image is drawn and the area where the second image is drawn are shown with different hatching. Therefore, image data for drawing the same halftone image may be generated for the regions indicated by the same hatching. Alternatively, FIG.
As shown in, the first image data composed only of the area where the first image is rendered is generated, and the second image data composed only of the area where the second image is rendered is generated. Is also good. In this manner, a cherry paper image can be formed by drawing a plurality of figures. When the cherry paper image is constructed in this way, the area for drawing the second image and the area for drawing the first image do not need to be completely adjacent to each other. It does not matter if they overlap.

FIG. 12 is an explanatory diagram of a third example of a method for drawing a cherry paper image using cherry paper image data. This example is a modification of the second example shown in FIG. In this example,
The figure that divides the cherry paper image is a rectangle, and the rest is the same as the second example described above. In the case of using a rectangle as described above, the image data to be generated is simple, and the processing speed can be increased. Since the description can be made regularly, it is possible to use, for example, a repetition command shown in the following example to some extent, and it is also possible to reduce the data amount of the image data.

FIG. 13 is an explanatory diagram of a fourth example of a drawing method of a cherry paper image using cherry paper image data. This example shows an example in which a repetition command is used as image data. In the example shown in FIG. 13, first, as shown in FIG. 13A, the drawing color of the halftone fine pattern representing the first image is designated (color designation), and the drawing color of the cherry paper image in the vertical direction is designated. The repetition of the number of minute patterns and the repetition of the number of horizontal minute patterns arranged in one row are instructed, and the minute pattern is designated. As a result, the minute pattern is repeatedly developed over the entire cherry paper image.

Next, as shown in FIG. 13B, an area is designated by a portion where the second image is superimposed, in this case, a character string "AB", and white is designated this time as a color designation. I do. Then, a repetition in the vertical direction and a repetition in the horizontal direction arranged in one line are instructed, and a minute pattern is designated. Thus, the minute pattern is drawn in white only in the character string. Therefore, a minute pattern is drawn by the image data shown in FIG. 13A, a minute pattern is drawn in white in a character string in white, and the previously drawn minute pattern is erased. Thus, FIG.
A first image as shown in FIG. 3 (C) can be generated.

The second image is shown in FIG.
The color designation of the image data shown in FIG.
The color may be specified so as to have the same apparent color as the image. As for the pattern specification, a halftone dot pattern having a different number of lines from the first image may be specified.

In the image data shown in FIG. 13, for example, the image data shown in FIG. 13A is used as the first image data, and the image data shown in FIG.
Can be used as adjustment image data for the image.

FIG. 14 is an explanatory diagram of a fifth example of a method for drawing a cherry paper image using cherry paper image data. This example also shows an example in which a repetition command is used as image data. The example shown in FIG. 14 shows an example in which a small cherry paper pattern of a predetermined unit is repeatedly drawn by using a repetition command. In other words, vertical repetition and 1
A repetition in the horizontal direction in the line is instructed, and one unit of a cherry paper pattern is specified as a pattern to be repeatedly drawn. In this example, bitmap data in which a latent image and a background image are drawn are specified as the cherry paper pattern. Of course, the present invention is not limited to this, and it is possible to specify one unit of the sakura paper pattern by using the method shown in FIGS. 10 to 13 and other various methods.

As in the examples shown in FIGS. 13 and 14, by instructing the drawing of the pattern using a repetitive command, it is possible to draw the sakura paper image with less image data. Therefore, for example, even when the cherry paper image data is held in the cherry paper image data holding unit 3, the area can be effectively used. Further, even when the cherry paper image data is transferred via the transmission path, it is possible to transfer the image data in a short time and at a high speed.

[0051]

As is apparent from the above description, according to the present invention, output image data is generated by adding cherry paper image data for drawing a cherry paper image including a latent image after document image data. I made it. Thus, if the drawing process is performed based on the output image data, even if the drawing is performed such that the white image is drawn in the document image data, the drawing of the cherry paper image data is performed thereafter. This has the effect of preventing such a problem as being lost. Therefore, if drawing is performed based on the output image data and printing is performed, a printed matter similar to that in the case of using previously printed cherry paper can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a change in image data according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating an example of an operation according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a specific example of an image formed by output image data generated according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram of a first example of a method of adding cherry paper image data.

FIG. 6 is an explanatory diagram of a second example of a method of adding cherry paper image data.

FIG. 7 is an explanatory diagram of a third example of a method for adding cherry paper image data.

FIG. 8 is an explanatory diagram of a fourth example of a method of adding cherry paper image data.

FIG. 9 is an explanatory diagram of a fifth example of a method for adding cherry paper image data.

FIG. 10 is an explanatory diagram of a first example of a drawing method of a cherry paper image using cherry paper image data.

FIG. 11 is an explanatory diagram of a second example of a method for drawing a cherry paper image using cherry paper image data.

FIG. 12 is an explanatory diagram of a third example of a drawing method of a cherry paper image using cherry paper image data.

FIG. 13 is an explanatory diagram of a fourth example of a drawing method of a cherry paper image using cherry paper image data.

FIG. 14 is an explanatory diagram of a fifth example of a drawing method of a cherry paper image using cherry paper image data.

FIG. 15 is an explanatory diagram of an example of a print pattern of cherry paper.

[Explanation of symbols]

 1 input unit, 2 synthesis unit, 3 cherry tree image data holding unit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C087 AA09 AA13 AB05 BA03 BC02 BD09 CA12 CB07 2C187 CD07 5C076 AA01 AA14 AA27 BA06

Claims (17)

[Claims] 1. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears at the time of copying, and input means for receiving document image data for rendering a document image. An image processing apparatus comprising: a synthesizing unit that generates the output image data by adding cherry paper image data for drawing a cherry paper image including a latent image after the original image data. 2. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears during copying, and input means for receiving document image data for rendering a document image. Synthesizing means for generating the output image data by adding cherry paper image data for drawing a cherry paper image including a latent image after the original image data, wherein the cherry paper image is composed of a first image and a second image. Wherein the synthesizing unit generates the first image and the second image after the first image data for drawing the first image as the cherry paper image data. Adding adjusted image data for correcting the first image so that the apparent densities of the two become substantially equal when drawing, and adding second image data for drawing the second image. Feature Image processing device. 3. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears at the time of copying, wherein a cherry paper image including a latent image is rendered while a document image is rendered. Input means for receiving original image data for drawing the first image out of the first image and the second image constituting the first image and the first image and the second image after the original image data The first is performed so that the apparent densities of the two become substantially equal when drawing.
An image processing apparatus, comprising: synthesizing means for adding the adjustment image data for correcting the image and adding the second image data for drawing the second image to generate the output image data. 4. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears during copying, and input means for receiving document image data for rendering a document image. Synthesizing means for generating the output image data by adding cherry paper image data for drawing a cherry paper image including a latent image after the original image data, wherein the cherry paper image is composed of a first image and a second image. And the second image data for drawing the second image after the first image data for drawing the first image as the cherry paper image data. And an adjustment image for correcting the first image or the second image so that when the first image and the second image are drawn, the apparent densities of the two become substantially equal. Add data An image processing apparatus, comprising: 5. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears during copying, and input means for receiving document image data for rendering a document image. Drawing the first image of the first image and the second image adjusted so that the apparent densities of the cherry paper image including the latent image after the original image data are substantially equal. Adding a first image data and further rendering the second image
An image processing apparatus, comprising: synthesizing means for generating the output image data by adding the above image data. 6. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears during copying, and input means for receiving document image data for rendering a document image. Adding cherry paper image data for drawing a cherry paper image including a latent image obtained by synthesizing the first image and the second image adjusted so that the apparent densities are substantially equal to each other after the original image data. An image processing apparatus comprising a synthesizing unit that generates the output image data. 7. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears during copying, and input means for receiving document image data for rendering a document image. Image processing means for generating the output image data by adding, after the original image data, cherry blossom paper image data for drawing colored pixel portions constituting a cherry blossom paper image including a latent image, respectively. apparatus. 8. An image processing apparatus for generating output image data described in a page description language for rendering an image in which a latent image appears during copying, and input means for receiving document image data for rendering a document image. Adding, after the original image data, cherry paper image data for selectively drawing either the first image or the second image constituting the cherry paper image including the latent image for each partial area, and An image processing apparatus comprising a synthesizing unit for generating data. 9. At least one of the cherry blossom paper image data, the first image data, the second image data, and the adjustment image data includes image data in which a pattern corresponding to each image is repeated. The image processing apparatus according to claim 1, wherein the image processing apparatus includes the image processing apparatus. 10. An image processing method for generating output image data described in a page description language for rendering an image in which a latent image appears at the time of copying, wherein a latent image is added after document image data for rendering a document image. An image processing method characterized by adding cherry paper image data for drawing a cherry paper image including the above, and generating the output image data. 11. An image processing method for generating output image data described by a page description language for drawing an image in which a latent image appears at the time of copying, wherein a cherry-paper image including a document image and a latent image is formed. When the first image and the second image are drawn after the original image data for drawing the first image of the first image and the second image, the apparent densities of the two are substantially equal. The first to be equal
An image processing method, further comprising: adding adjustment image data for correcting the image of (i), further adding second image data for drawing the second image, and generating the output image data. 12. An image processing method for generating output image data described by a page description language for rendering an image in which a latent image appears at the time of copying, wherein the latent image is added after the document image data for rendering the document image The first image data and the second image data for drawing the first image and the second image constituting the cherry-blossom paper image including
And adjusting image data for correcting the first image or the second image so that the apparent densities of the image and the second image are substantially equal when the image is drawn and the output image data. An image processing method characterized by generating 13. An image processing method for generating output image data described in a page description language for rendering an image in which a latent image appears at the time of copying, wherein the latent image is added after the original image data for rendering a document image Adding first image data for drawing the first image of the first image and the second image adjusted so that the apparent densities constituting the cherry-blossom paper image including An image processing method, further comprising adding second image data for drawing the second image to generate the output image data. 14. An image processing method for generating output image data described by a page description language for rendering an image in which a latent image appears at the time of copying, wherein an apparent image is added after the original image data for rendering a document image. Generating cherry blossom paper image data for drawing a cherry blossom paper image including a latent image obtained by synthesizing the first image and the second image adjusted so that the densities are substantially equal to each other, and generating the output image data. Characteristic image processing method. 15. An image processing method for generating output image data described by a page description language for rendering an image in which a latent image appears at the time of copying, wherein the latent image is added after the original image data for rendering the document image An image processing method characterized by adding cherry paper image data for drawing each of colored pixel portions constituting a cherry paper image including the above, and generating the output image data. 16. An image processing method for generating output image data described in a page description language for rendering an image in which a latent image appears at the time of copying, wherein a partial area is provided after original image data for rendering a document image. The output image data is generated by adding cherry paper image data for selectively drawing either the first image or the second image constituting the cherry paper image including the latent image for each image. Image processing method. 17. At least one of the cherry blossom paper image data, the first image data, the second image data, and the adjustment image data includes image data in which a pattern corresponding to each image is repeated. The image processing method according to claim 10, wherein the image processing method includes: