JP2001024875A - Method and device for image processing and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To output image data in which a watermark image is embedded and information eliminated for embedding it as key information by changing pixel information for original image data included in an area instructed by form information of the watermark image, generating key information decided based on the pixel information and outputting the changed original image data and the key information. SOLUTION: In an electronic watermark embedding device, original image (x) each of which includes plural pixels constituted with a pixel position and a pixel value and an embedded image (r) of watermark image data consisting of the pixel position for indicating a form of an image to be embedded are inputted to an input part 11. In a separator 13, at least more than one color component is separated from the original image (x) out of three color components composing the pixel value of the specified pixel position of the original image (x) from a switching device 12, and the separated information is stored as key information (k). Also, remaining information x1 from which this key information (k) is separated is outputted to a switching device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing method for generating image data in which a digital watermark is embedded in original image data and / or for generating an original image data by removing a digital watermark portion from the image data. The present invention relates to an apparatus and a storage medium.

[0002]

2. Description of the Related Art A digital image in which an image is treated as a digital signal can be easily copied by a computer or the like as compared with a conventional analog image represented by an analog signal, and the image quality is deteriorated even if such copying is performed. There is an advantage that the image can be transmitted to a remote place through a communication line without deteriorating the image quality. However, due to such characteristics, there is a problem that a digital image is easily copied and redistributed by a third party. One method for preventing this is a method called digital watermarking.

[0003] The digital watermark is roughly classified into two types: an invisible type in which watermark information such as copyright information and user information is embedded in an invisible form in an image, and a watermark image such as a logo of a company holding the copyright. There is a visible type which is formed on an image in a visible form. In the former invisible type digital watermark, it is not possible to recognize that the watermark information is embedded at a glance of the embedded image. Therefore, although it is difficult to delete the watermark information, the image is illegally copied and edited more easily than in the visible type.
However, even if the digital image data is illegally copied or edited, since the watermark information remains in the digital image data, an illegal copy or the like was performed by the user ID or the like embedded as the watermark information. The user can be specified.

As a typical example of such an invisible type digital watermark, a frequency conversion such as a fast Fourier transform, a discrete cosine transform, and a wavelet transform is performed on an input image, and after adding watermark information to a frequency domain, the inverse is performed. There is a method of embedding a digital watermark by performing frequency conversion. Among them, in the method based on the fast Fourier transform, the input image is added with a PN sequence and spread, then divided into blocks, Fourier transformed for each block, and 1-bit watermark information is embedded in one block. . In this way, the block in which the watermark information is embedded is subjected to inverse Fourier transform, and the same PN sequence as the first is added again to form a composite image. This technology is described in, for example, "Watermark Signature Method for Images Using PN Sequence" by Onishi, Oka, Matsui, etc.
(1997, Cryptography and Information Security Symposium Proceedings, SCIS97-26B). In the method using the discrete cosine transform, the data is divided into blocks, and discrete cosine transform is performed for each block. After embedding 1-bit information in one block, a reverse conversion is performed to generate a composite image. This is described in detail in, for example, "Digital Watermarking System in the Frequency Domain for Copyright Protection of Digital Images" by Nakamura, Ogawa, Takashima, et al. (1997, Symposium on Cryptography and Information Security, SCIS97-26A). Furthermore, the method based on the wavelet transform is a method that does not need to divide the input image into blocks. This is an experimental study by Ishizuka, Sakai, Sakurai et al. “Experimental study on the safety and reliability of the electronic watermarking technology using the wavelet transform” ( 1997, Cryptography and Information Security Symposium, SCIS97-26D)
Familiar with. In addition, a technique for embedding a digital watermark by performing calculations on the hue and brightness of pixels (Digimarc, US Pat. No. 5,636,
292).

On the other hand, in the case of a visible digital watermark, since the watermark information is written in a form visible on a digital image, it is difficult to use it as it is, and there is an effect of discouraging illegal copying and unauthorized editing. Such a visible digital watermark may be configured so that only the correct user can completely remove the watermark information.
As a specific example, an image with a visible watermark is distributed to an unauthorized user of the image data, and an image without a visible watermark is distributed to an authorized user. May be distributed.

One way to achieve this is as follows:
Conventionally, the copyright information is pasted into the original image data by replacing the pixel value of the image such as logo with the pixel value of the original image, and the image data with the logo etc. is distributed to unauthorized users. A method of distributing original image data as it is to authorized users has been used. But,
Since the content of the image data portion in which the visible digital watermark is embedded is replaced by the content of the image such as a logo, the user cannot know the content of the original image data corresponding to this portion. Further, in order to remove such a digital watermark, it is necessary to transmit all of the original image data. However, since the original image data is generally very large data, it takes a lot of time to transmit the original image data. Needed.

[0007] In addition to this, Japanese Patent Laid-Open No.
There is also a method proposed in Japanese Patent Publication No. This is a method of embedding a visible digital watermark while preserving chromaticity by linearly converting the luminance value of original image data. In this method, the user can know the contents of the original image data in the area where the visible digital watermark is embedded, but the method of releasing the visible digital watermark is not clarified.

[0008]

As described above, conventionally, a visible electronic watermark is embedded in original image data.
No method has been proposed for removing the digital watermark portion from the image data in which the digital watermark is embedded. Therefore, in order to provide an authorized user with original image data from which a visible digital watermark has been released, it is necessary to transmit all the data of the original image to the user. Such transmission of all original image data requires a lot of time, and also has a problem in transmission cost.

The present invention has been made in view of the above-mentioned conventional example, and inputs original image data and shape information of a watermark image, removes the image data in which the watermark image is embedded, and removes the image data in order to embed the watermark image. It is an object of the present invention to provide an image processing method and apparatus for outputting the obtained information as key information.

Another object of the present invention is to provide an image processing apparatus for restoring data of an original image based on image data in which a watermark image is embedded and key information corresponding to information removed for embedding the watermark image. It is to provide a method and an apparatus.

It is another object of the present invention to input original image data and shape information of a watermark image, and to convert image data with a watermark image embedded therein and information removed to embed the watermark image into key information. And further compress this key information,
Another object of the present invention is to provide an image processing method and apparatus for encrypting and outputting.

It is another object of the present invention to provide a digital camera based on image data in which a watermark image is embedded, and compressed and / or encrypted key information corresponding to information removed for embedding the watermark image. Another object of the present invention is to provide an image processing method and apparatus for restoring data of an original image.

[0013]

In order to achieve the above object, an image processing apparatus according to the present invention has the following arrangement.
That is, an image processing apparatus for embedding a watermark image in original image data, an input unit for inputting original image data and shape information of the watermark image, and the original image data included in an area designated by the shape information. Changing means for changing the pixel information of, and key information generating means for generating key information determined based on the pixel information changed by the changing means,
An output unit that outputs the original image data whose pixel information has been changed by the changing unit and the key information.

In order to achieve the above object, an image processing apparatus according to the present invention has the following arrangement. That is, an image processing apparatus for inputting embedded image data in which a watermark image is embedded in original image data and restoring the original image data, wherein the embedded image data, shape information and key information of the watermark image are input. Input means for performing restoration, restoration means for restoring pixel information of the embedded image data included in the area designated by the shape information to original pixel information based on the key information, and pixels restored by the restoration means Output means for outputting original image data including information.

[0015] To achieve the above object, the image processing method of the present invention comprises the following steps. That is, an image processing method for embedding a watermark image in original image data, comprising: an input step of inputting original image data and shape information of the watermark image; and the original image data included in an area specified by the shape information. A changing step of changing the pixel information, a key information generating step of generating key information determined based on the pixel information changed in the changing step, and original image data in which the pixel information is changed in the changing step. And an output step of outputting the key information.

In order to achieve the above object, the image processing method of the present invention comprises the following steps. That is, an image processing method for restoring the original image data by inputting embedded image data in which a watermark image is embedded in the original image data, wherein the embedded image data, shape information and key information of the watermark image are input An inputting step, a restoring step of restoring pixel information of the embedded image data included in an area designated by the shape information to original pixel information based on the key information, and a pixel restored in the restoring step. Outputting an original image data including information.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[First Embodiment] FIG. 1 is a block diagram showing a schematic configuration of a digital watermark embedding device according to a first embodiment of the present invention.

In FIG. 1, original image data x and embedded image data r are input to an input unit 11. Here, the original image data x is original image data that includes a plurality of pixels each including a pixel position and a pixel value (luminance value). In the first embodiment, the original image data x Is pixel data composed of a red (R) component, a green (G) component, and a blue (B) component, and each color component is represented by 256 gradations (8 bits). The embedded image data r is watermark image data including pixel positions indicating the shape of the image to be embedded.

The embedded image data r is, for example, as shown in FIG.
The data may have any meaning, depending on the user or the like, or may have no meaning. For example, as data having a meaningful content, data that asserts copyright information or the like, such as a logo mark, can be considered. Here, when embedding information indicating a logo as shown in FIG. 9, as information indicating an area, a code “1” is associated with a black pixel, and a code “0” is associated with a white pixel. As shown in FIG. 10, it is possible to configure serial bit sequence data indicating the embedded image data r. In the case of data having meaningless contents, it is conceivable to represent the data with information that masks a specific position of the original image data.

The above-described original image data x and embedded image data r are set in an initial state.

Next, the switching unit 12 compares the pixel position of the pixel of the original image data x with the shape information of the watermark image included in the embedded image data r. The pixel value of the original image data x is output to the switching unit 14 without performing the separation and switching process on the pixel if the pixel value does not match.

In the separator 13, at least one or more color components of the three color components constituting the pixel value (all or part) at the designated pixel position of the original image data x are converted from the original image data. It separates and stores the separated information as key information k. Also, the remaining information (x
1) is output to the switch 14.

The color component information separated here has 256 gradations, that is, an information amount of 8 bits in the first embodiment. Therefore, the information to be separated (key information k) may be all 8 bits or less than 8 bits, but needs to be at least 1 bit or more. In addition,
In order to effectively perform a visible watermark embedding process without depending on the original image data x, it is desirable to separate all 8 bits of information. However, since the separated information is output as the key information k, if it is desired to reduce the key information k, it is necessary to control the information amount of the separated key information k to be small.

Further, when the number of color components to be separated is one, the contents of the pixel position of interest at present can be expressed by the remaining two colors. For example, even if the red component is separated, the content of the pixel position currently focused can be expressed by the remaining green component and blue component. However, in this case, since the red component is not included, the color at this pixel position changes. By this change in color tone, it is possible to visually assert to the user that the digital watermark is embedded. When the number of color components to be separated is three,
The content of the focused pixel position cannot be expressed. This may be an effective means for an application that does not want to notify the content of the image of interest. Note that the above-described processing in the present embodiment can be sequentially performed for each pixel or can be performed in parallel.

By the above-described processing, the original image data can be modified according to the shape information of the watermark image data. This modification differs from the invisible digital watermark described above in that its pixel value is greatly changed according to the separator 13, so that it becomes a visible visible watermark. The image data (x1) separated by the separator 13 in this manner is supplied to the switch 1
4 is input. In this switch 14, similarly to the switch 12 described above, the pixel position of the pixel of the original image data x,
The shape information of the watermark image included in the embedded image data r is compared with each other. If they match, the image data (x1) input from the separator 13 is sent to the output unit 15. The output unit 1 outputs the pixel value of the data x as it is
5 is output. In this way, the image data in which the watermark image is embedded is reformed, and the result is output to the output unit 15. Further, the key information k separated by the separator 13 is also output to the output unit 15. Thus, the output unit 15 outputs the embedded image data x ′ in which the watermark image is embedded and the key information k.

The image data generated by the processing of the first embodiment as described above is hereinafter referred to as a visible digital watermark embedded image.

This image can be reversibly restored by the decoding method described in the second embodiment. If the shape of the watermark image is meaningful information such as a logo of the copyright holder, the image may be different from a simple image scramble. The effect of rights information protection can be realized.

[Embodiment 2] FIG. 2 is a block diagram showing a schematic configuration of a digital watermark canceling apparatus according to an embodiment of the present invention.

In FIG. 2, an image x 'having a visible digital watermark embedded therein, embedded image data r, and key information k
Is input from the input unit 21. Here, the visible digital watermark embedded image x ′ is image data x ′ processed by the configuration described in the first embodiment, and the embedded image data r is input in the first embodiment. This is equivalent to the embedded image data r. Further, the key information k must be equal to the key information k output as described in the first embodiment. If these pieces of information, particularly the embedded image data r and the key information k, are not correctly input, the processing according to the second embodiment does not end normally. Here, the normal end means reversibly restoring the original image data x from the image x 'with the visible digital watermark embedded therein.

In the second embodiment, each of the visible digital watermark embedded image x 'composed of a plurality of pixels composed of the pixel position and the pixel value, and the watermark composed of the pixel position indicating the shape of the image to be embedded. In the initial state, image shape information (embedded image data) r, which is the same serial bit sequence embedded image data used for embedding in the first embodiment, is set.

In the switch 22 of FIG. 2, the pixel position of each pixel constituting the digital watermark embedded image x '
Performs comparison processing with the pixel position of the embedded image data r,
If they match, the pixel position information is sent to the combiner 23. If they do not match, the combining process for the pixel is not performed and the watermark-embedded image x 'is directly input to the switch 24. Note that the watermark-embedded image x ′ input to the switch 24 here is the same as the embedded image r of the first embodiment because the embedded image r of the second embodiment is the same as the embedded image r of the first embodiment. Embodiment 1
Is equal to the original image data x at

The synthesizer 23 inputs the pixel value (all or a part) of the original image data at the designated pixel position and the key information k at that time, and outputs the three color components of the pixel value. Focusing on the component separated in the first embodiment, the key information k is combined with this component. It should be noted that the combining method in the combiner 23 must completely correspond to the separating method in the separator 13 in the first embodiment. That is, for example, when all the information (8 bits) of the red component is separated by the separator 13, all the information (8 bits) of the red component needs to be synthesized from the key information k by the synthesizer 23. is there. Thus, the image data output from the synthesizer 23 is output to the switch 24 as the pixel value at the embedded image position being restored to the original original image data. This switch 24
Sets the pixel value at the pixel position designated by the embedded image data r as the pixel value output from the synthesizer 23, and outputs the pixel value at the other pixel position as it is from the switch 22. In this way, the output unit 25 displays the embedded image x ′
, A removed image x ″ (equivalent to the original image data x in FIG. 1) from which the digital watermark image has been removed is input and output as it is.

The processing according to the second embodiment can be performed sequentially for each pixel or can be performed in parallel.
As a result, the image x ′ embedded with the visible digital watermark generated according to the first embodiment is reversibly decoded into the original image data x.

[Third Embodiment] FIG. 3 is a block diagram showing a schematic configuration of a digital watermark embedding device according to a third embodiment of the present invention. Here, the output key information k is encrypted and output. I have. Note that the same reference numerals as in the configuration of FIG. 1 according to Embodiment 1 described above denote the same parts, and a description thereof will be omitted.

The encryption unit 36 performs an encryption process on the output key information k. Here, the key information k output according to the first embodiment must be input to the second embodiment using an appropriate transmission path.
Here, in the case where the first and second embodiments are applied to an application in which only an authorized user can normally execute the digital watermark release, the key information k Must be safely transmitted on the transmission path. Here, "secure transmission" means that a third party does not eavesdrop on the transmission path and / or
Alternatively, it means that communication is performed without tampering. In order to establish this secure transmission path, the third embodiment transmits the key information k by encrypting it.

Therefore, in the encryptor 36, the separator 1
3 performs an appropriate encryption process on the key information k generated by step 3 and outputs encrypted key information k ′.

The encryption processing in the encryptor 36 includes, for example, DES (Ikeno and Koyama, "Modern Cryptography Theory", detailed in IEICE) as a common key cryptosystem.
FEAL, TDEA, RC2, RC4, RC5, MIS
It is possible to use TY, Caesar type encryption, business encryption, Beaufort encryption, play fair encryption, Hill encryption, Burnham encryption, and the like.

FIG. 4 is a schematic diagram of a digital watermark canceling device according to a fourth embodiment of the present invention for canceling a digital watermark embedded by the digital watermark embedding device of FIG. 3, which is common to the configuration of FIG. Portions are denoted by the same reference numerals, and description thereof will be omitted.

The digital watermark canceling apparatus according to the fourth embodiment includes a decoder 40 for decoding the encrypted key information k '. The decryptor 40 performs decryption processing on the encrypted key information k ′. Using the key information k decrypted by the decryptor 40, the embedded digital watermark can be canceled by the digital watermark embedding device in the same manner as in the configuration of FIG. 2 described above.

[Embodiment 4] FIG. 5 is a block diagram showing a configuration of a digital watermark embedding apparatus according to Embodiment 4 of the present invention. Here, key information k output in Embodiment 1 described above is The data is compressed and output by the data compressor 56. Note that parts common to those in the configuration of FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The data compressor 56 outputs the output key information k
Is subjected to data compression processing. The key information k output according to the first embodiment must be input to the second embodiment using an appropriate transmission path. Here, when the appropriate transmission path is a communication path typified by the Internet or a storage medium such as a CD-ROM, the information amount of the key information k is preferably as small as possible. Therefore, in order to make the information amount of the key information k as small as possible, in the fourth embodiment, the key information k is compressed and transmitted. The data compressor 56 performs an appropriate data compression process on the key information k generated by the separator 13. This separator 1
The color information separated by 3 has many redundant components when image data such as a logo is spatially continuous.
This is more noticeable when the original image data x is a general natural image such as a photograph. Therefore, a greater data compression effect can be expected for the key information k.

In this data compression processing, for example, as a compression method, an LZW method using a dictionary, Huffman coding based on statistical fluctuation, or arithmetic coding in which Huffman coding is improved can be used. This data compressor 5
The key information k ″ subjected to the data compression processing by 6 is used by an electronic watermark canceling device described later. For this reason, this compression method must be a reversible process.

FIG. 6 is a block diagram showing a configuration of a digital watermark canceling apparatus according to Embodiment 4 of the present invention.
The digital watermark embedded by the digital watermark embedding device is released. The configuration of the release device according to the fourth embodiment is as follows.
As compared with the configuration of FIG. 2, the compressed key information k ″
Has the same configuration except that a data decompressor 60 for decompressing is provided. 2 are denoted by the same reference numerals, and description thereof will be omitted. This data decompressor 60
Performs a decompression process on the key information k ″ subjected to the data compression process, and outputs the decompressed key information k.

In this manner, the compressed key information k ″ is received and decompressed, and the original key information k obtained by decompression is used in the same manner as in the apparatus of FIG. It is possible to cancel the digital watermark embedded by the digital watermark embedding device.

[Fifth Embodiment] FIG. 7 is a block diagram showing a schematic configuration of a digital watermark embedding device according to a fifth embodiment of the present invention. And description thereof is omitted.

In the fifth embodiment, the method of encrypting the key information k shown in the third embodiment and the method of compressing the key information k described in the fourth embodiment are combined. Selectively available. In this case, due to the nature of the data of the key information k, it is preferable to perform the encryption processing after performing the data compression processing.

This is because the key information k has the property of a signal of general natural image data, and thus has many redundant components and can effectively execute data compression processing. This is because the converted data does not have the signal properties of general natural image data and it is expected that redundant components will be reduced.

FIG. 8 is a block diagram of a device for canceling a digital watermark embedded by the digital watermark embedding device shown in FIG. 7 according to the fifth embodiment of the present invention.

As shown in FIG. 7, when the key information k is data-compressed and thereafter encrypted, as shown in FIG. 8, the data-compressed and encrypted key information kx
Needs to be decompressed after being decoded by the data decompressor 60 and the decoder 40, as in the case of the apparatus in FIG.

On the other hand, in the device shown in FIG. 7, when the data compression processing is performed after the key information k is first encrypted, the key information kx input in FIG. It needs to be decrypted and then decompressed.

The present invention is not limited only to an apparatus and a method for realizing the above-described embodiment, and a method performed by combining the methods described in the above-described embodiment.
A software program code for implementing the above-described embodiment is supplied to a computer (CPU or MPU) in the system or the apparatus, and the computer of the system or apparatus operates the various devices according to the program code. Accordingly, a case where the above-described embodiment is realized is also included in the scope of the present invention.

In this case, the program code of the software implements the functions of the above-described embodiment, and the program code itself and means for supplying the program code to the computer, specifically, A storage medium storing the above program code is included in the scope of the present invention.

As a storage medium for storing such a program code, for example, a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, C
D-ROM, magnetic tape, non-volatile memory card, R
OM or the like can be used.

In addition to the case where the computer controls various devices in accordance with only the supplied program code to realize the functions of the above-described embodiment, the program code operates on the computer. Such a program code is also included in the scope of the present invention when the above-described embodiment is realized in cooperation with an OS (Operating System) or another application program.

Further, after the supplied program code is stored in a memory provided in a function expansion board of a computer or a function expansion unit connected to the computer, the function expansion board or function is stored based on the instruction of the program code. The case where the CPU or the like provided in the storage unit performs part or all of the actual processing, and the above-described embodiment is realized by the processing is also included in the scope of the present invention.

As described above, according to this embodiment, the original image data and the shape information of the watermark image are input, and the pixels of the original image data included in the watermark image indicated by the shape information of the watermark image are input. An embedded image in which a watermark image obtained by separating specific information from a value is embedded is generated. At this time, by using the separated specific information as key information, the original image can be restored using the key information.

As a result, a visible digital watermark embedding method with high security has become possible.

Further, the key information is transmitted after being encrypted, and the receiving side that has received the key information decrypts the key information to generate an original image. Will be possible.

Further, the key information is compressed and transmitted, and the key information is decompressed (decompressed) on the receiving side to generate an original image, thereby reducing the amount of data to be transmitted.
In addition, it is possible to transmit a visible digital watermark embedded image with high security.

Further, by performing both the encryption and the data compression, it is possible to further reduce the amount of data to be transmitted and transmit a visible digital watermark embedded image with high security.

[0062]

As described above, according to the present invention, the original image data and the shape information of the watermark image are input, and the image data in which the watermark image is embedded and the image data in which the watermark image is embedded are removed. Image processing method and apparatus for outputting the obtained information as key information.

According to the present invention, image processing for restoring data of an original image based on image data in which a watermark image is embedded and key information corresponding to information removed for embedding the watermark image. Methods and apparatus can be provided.

Further, according to the present invention, the original image data and the shape information of the watermark image are input, and the image data in which the watermark image is embedded and the information removed to embed the watermark image are used as key information. And further compress this key information,
And / or encrypting and outputting, it is possible to further reduce the amount of image data and to form a watermark-embedded image with high security.

Further, according to the present invention, based on image data in which a watermark image is embedded, and compressed and / or encrypted key information corresponding to information removed for embedding the watermark image. The original image data can be restored.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a digital watermark embedding device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of a digital watermark canceling device according to Embodiment 2 of the present invention.

FIG. 3 is a block diagram illustrating a schematic configuration of a digital watermark embedding device using encryption processing of key information according to a third embodiment of the present invention.

FIG. 4 is a block diagram illustrating an outline of a digital watermark canceling device according to a third embodiment of the present invention, which receives encrypted key information and cancels electronic visibility.

FIG. 5 is a block diagram schematically illustrating a digital watermark embedding device for compressing key information according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram illustrating a schematic configuration of a digital watermark canceling device according to a fourth embodiment when compressed key information is used.

FIG. 7 is a block diagram illustrating an outline of a digital watermark embedding apparatus according to a fifth embodiment of the present invention when encryption processing of key information and data compression processing are used in combination.

FIG. 8 is a block diagram schematically illustrating a digital watermark canceling device according to a fifth embodiment for canceling a digital watermark based on encrypted and compressed key information.

FIG. 9 is a diagram illustrating an example of embedded image data according to the present embodiment.

FIG. 10 is a diagram illustrating an example of area data created from the embedded image data shown in FIG. 9;

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Claims (24)

[Claims] 1. An image processing apparatus for embedding a watermark image in original image data, comprising: input means for inputting original image data and shape information of the watermark image; Changing means for changing the pixel information of the original image data; key information generating means for generating key information determined based on the pixel information changed by the changing means; An image processing apparatus comprising: output means for outputting image data and the key information. 2. The method according to claim 1, wherein the change unit compares the shape information with each pixel position of the original image data and changes a value of a predetermined color component of a pixel value of a pixel position included in the shape information. The image processing apparatus according to claim 1, wherein: 3. The method according to claim 2, wherein the changing unit compares the shape information with each pixel position of the original image data and changes a part of a pixel value of a pixel position included in the shape information. Item 2. The image processing device according to Item 1. 4. The key information generating unit according to claim 1, wherein the key information generating unit generates the key information based on a difference between the changed pixel information and a corresponding pixel value of the original image data.
The image processing device according to any one of claims 1 to 3. 5. The apparatus according to claim 1, wherein said output means has an encryption means for encrypting said key information.
The image processing device according to any one of claims 1 to 4. 6. The image processing apparatus according to claim 1, wherein the output unit includes a compression unit that compresses the key information. 7. An image processing apparatus for restoring original image data by inputting embedded image data in which a watermark image is embedded in original image data, wherein the embedded image data, shape information of the watermark image, and a key Input means for inputting information; restoring means for restoring pixel information of the embedded image data included in the area designated by the shape information to original pixel information based on the key information; restoring by the restoring means Output means for outputting original image data including the obtained pixel information. 8. The restoration unit compares the shape information with each pixel position of the embedded image data, and determines a value of a predetermined color component of a pixel value of a pixel position included in the shape information according to the key information. The image processing device according to claim 7, wherein the image processing device is changed. 9. The restoration unit compares the shape information with each pixel position of the embedded image data, and changes a part of a pixel value of a pixel position included in the shape information according to the key information. The image processing apparatus according to claim 7, wherein: 10. The image processing apparatus according to claim 7, wherein the key information is encrypted, and further comprising a decryption unit for decrypting the key information. 11. The key information is data-compressed,
The image processing apparatus according to claim 7, further comprising a decompression unit that decompresses the key information. 12. An image processing method for embedding a watermark image in original image data, comprising: an input step of inputting original image data and shape information of the watermark image; and an image processing method included in an area specified by the shape information. A changing step of changing the pixel information of the original image data, a key information generating step of generating key information determined based on the pixel information changed in the changing step, and an original in which the pixel information is changed in the changing step. An image processing method, comprising: outputting an image data and the key information. 13. In the changing step, the shape information is compared with each pixel position of the original image data, and a value of a predetermined color component of a pixel value of a pixel position included in the shape information is changed. The image processing method according to claim 12, wherein: 14. The method according to claim 1, wherein in the changing step, the shape information is compared with each pixel position of the original image data, and a part of a pixel value of a pixel position included in the shape information is changed. Item 13. The image processing method according to Item 12. 15. The key information generating step, wherein the key information is generated based on a difference between the changed pixel information and a corresponding pixel value of the original image data. The image processing method according to any one of the above. 16. The image processing method according to claim 12, wherein said output step includes an encryption step of encrypting said key information. 17. The apparatus according to claim 12, wherein said output step includes a compression step of compressing said key information.
7. The image processing method according to any one of 6. 18. An image processing method for restoring the original image data by inputting embedded image data in which a watermark image is embedded in the original image data, the image processing method comprising the steps of: An input step of inputting information; a restoring step of restoring pixel information of the embedded image data included in the area specified by the shape information to original pixel information based on the key information; An output step of outputting original image data including the obtained pixel information. 19. In the restoration step, the shape information is compared with each pixel position of the embedded image data, and a value of a predetermined color component of a pixel value of a pixel position included in the shape information is determined according to the key information. 19. The image processing method according to claim 18, wherein the method is changed. 20. The restoration step, wherein the shape information is compared with each pixel position of the embedded image data, and a part of a pixel value of a pixel position included in the shape information is changed according to the key information. 19. The image processing method according to claim 18, wherein: 21. The image processing method according to claim 18, wherein the key information is encrypted, and further comprising a decryption unit for decrypting the key information. 22. The key information is data compressed,
22. The image processing method according to claim 18, further comprising an expansion step of expanding the key information. 23. A storage medium for storing a program for executing an image processing method for embedding a watermark image in original image data, comprising: an input module for inputting original image data and shape information of the watermark image; A changing step module for changing the pixel information of the original image data included in the area designated by: a key information generating step module for generating key information determined based on the pixel information changed in the changing step An output step module for outputting original image data whose pixel information has been changed in the change step and the key information. 24. A storage medium storing a program for executing an image processing method for restoring the original image data by inputting embedded image data in which a watermark image is embedded in the original image data, wherein the embedded image data and An input step module for inputting shape information and key information of the watermark image, and restoring pixel information of the embedded image data included in an area designated by the shape information to original pixel information based on the key information A storage medium, comprising: a restoration step module for performing a restoration step; and an output step module for outputting original image data including the pixel information restored in the restoration step.