JP2006050135A - Method for burying watermark - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for burying a watermark in which a visible watermark removable completely is buried in case of an authorized user, and a third person cannot remove the visible watermark easily. <P>SOLUTION: For an original moving video composed of N frame images from first through N frames, (a) an identification image is buried as a watermark, and the first frame is attached with one not burying the identification image as information for reproducing the identification image thus obtaining a watermarked original moving video (b). When the watermark is removed, the identification image is obtained by calculating the difference between a first frame not having a watermark and a watermarked first frame, and then the original moving video is obtained by subtracting that identification image from each frame image (a). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to the field of video recording / playback using digital recording media such as CDs, DVDs, and semiconductor memories, video production, video data material storage, location material relaying, etc. In the field of high-definition video production, the field of CG animation video production using computer graphics, the field of visualization video production in science and technology simulation, the storage and transmission of medical still images and moving images in electronic medical records and telemedicine, and the digital printing plate making process The present invention relates to a data compression technique that is suitable in fields where data modification is hated, such as storage and transmission of materials and page makeup image data, and storage and transmission of data in the fields of remote sensing, satellite image analysis, and map information processing.

Conventionally, in order to prevent duplication of image data such as still images and moving images, there are a method of performing license authentication at the time of encryption and decryption, and a method of inserting a digital watermark that makes it possible to trace illegal use by specifying copyright information . The method of inserting a digital watermark is further roughly classified into an invisible type and a visible type, and the visible type needs to be removed at the stage of proper use (for example, see Patent Document 1).
JP 2000-216982 A

  However, the above conventional technique has a problem that when the digital watermark is removed, the lower bits are different from the original image, and there is a slight deterioration in image quality.

  Therefore, the present invention embeds a visible digital watermark that can be completely removed when used by a legitimate user, and embeds a digital watermark that is difficult for a third party to easily remove the visible digital watermark. It is an object to provide a method.

  In order to solve the above problems, the present invention prepares identification information to be embedded as a digital watermark into an original image, and based on that, an identification image creation step for creating an identification image corresponding to the size of the original image; An embedding process executing step of obtaining a watermarked image in which a digital watermark is embedded in the original image by adding a value of a corresponding pixel in the identification image to a value of each pixel of the original image; An identification information attaching step of attaching identification information for creating the identification image necessary for restoring the original image from the entered image on the user side to the watermarked image is performed. .

  According to the present invention, the identification information to be embedded as a digital watermark is embedded in the original image, and the identification information is attached to the watermarked image after the embedding process. The original image can be restored from the watermarked image by using the identified identification information.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a configuration diagram of an embedding device for realizing the digital watermark embedding method according to the first embodiment of the present invention. In FIG. 1, 1 is an original image input unit, 2 is a character font storage unit, 3 is an identification information character code input unit, 4 is a raster conversion unit, 5 is an embedding process execution unit, 6 is a lossless encoding processing unit, and 7 is It is a watermarked image output unit.

  The original image input unit 1 has a function of inputting original image data to be distributed. The character font storage unit 2 stores character fonts in a raster data format. The identification information character code input unit 3 has a function of inputting identification information to be embedded as a digital watermark in the form of a character code. The identification information is information that enables a viewer to identify some meaning, and includes, for example, copyright information indicating the origin of the original image and the copyright source of the original image. In addition, the digital watermark is, for example, a digital representation of a watermark that can be seen by holding a banknote over light. means. The raster conversion unit 4 has a function of converting the character code input from the identification information character code input unit 3 into a binary data in a raster data format with reference to the character font storage unit 2. The embedding processing execution unit 5 adds the original image input from the original image input unit 1 and the binary image output from the raster conversion unit 4 for each pixel, and includes a watermark in which a digital watermark is embedded in the original image It has a function to output as an image. The lossless encoding processing unit 6 has a function of compressing a watermarked image using a lossless encoding method. Here, the lossless encoding method is used because the lossy encoding method that allows the loss of data cannot restore the embedded information and cannot serve as a digital watermark. . Various known techniques can be used as specific processing techniques for lossless encoding. The watermarked image output unit 7 outputs the compressed watermarked image to the outside of the apparatus.

  Here, the process by the embedding process execution part 5 is demonstrated using FIG. 2A is an original image input from the original image input unit 1, and FIG. 2B is a binary image (identification image) that serves as a digital watermark converted by the raster conversion unit 4. . In the example of FIG. 2A, a case where each pixel is expressed by 8 bits is shown, and each pixel takes a value of 0-255. Here, a case of a monochrome image having only one color plane will be described. FIG. 2B shows a binary image that takes only two values, 0 and 128. Here, for simplification of explanation, both the original image and the binary image are 9 × 8 pixels. When the original image shown in FIG. 2A and the binary image shown in FIG. 2B are input, the embedding processing execution unit 5 performs addition processing for each pixel. At this time, if the result of addition exceeds 255, 256 is subtracted to perform processing for accommodating 0 to 255. That is, it is expressed by 8 bits, and overflow is ignored. As a result, a watermarked image as shown in FIG. 2C is obtained. When the original image is a color image, the above addition processing with the binary image is performed for each plane of the original image. Further, the embedding process execution unit 5 adds the character code input from the identification information character code input unit 3 to the header of the file for recording the watermarked image.

  The watermarked image obtained as described above is output from the watermarked image output unit 7 after being encoded by the lossless encoding processing unit 6, and transmitted via the network. At this time, a legitimate user is separately notified of the character font name so that the same character font as that used in the embedding apparatus is used. Here, FIG. 3 shows a digital watermark removing apparatus used by a user to remove a digital watermark. This digital watermark removing apparatus executes the digital watermark removing method according to the present invention. In FIG. 3, 11 is a watermarked image input unit, 12 is a character font storage unit, 13 is an identification information character code input unit, 14 is a raster conversion unit, 15 is a lossless decoding processing unit, 16 is a watermark removal execution unit, and 17 is An original image output unit.

  The watermarked image input unit 11 has a function of inputting a watermarked image in which a digital watermark is embedded by the digital watermark embedding apparatus shown in FIG. The character font storage unit 12 stores the same character font as that used in the digital watermark embedding apparatus. The identification information character code input unit 13 has a function of inputting information embedded as a digital watermark in the form of a character code. Here, since the watermarked image is recorded in the header of the file, the character code is read from the header and input. The raster conversion unit 14 has a function of converting the character code input from the identification information character code input unit 13 into a binary image in a raster data format with reference to the character font storage unit 12. The lossless decoding processing unit 15 has a function of decoding a lossless compressed watermarked image from a compressed state. Therefore, the decoding method by the lossless decoding processing unit 15 needs to correspond to the encoding method in the lossless encoding processing unit 6 in the digital watermark embedding apparatus. The watermark removal execution unit 16 adds the binary image output from the raster conversion unit 14 and the watermarked image output from the lossless decoding processing unit 15 for each pixel, and removes the digital watermark from the watermarked image. It has a function to output as an image. The original image output unit 17 is for outputting an original image from which a digital watermark has been removed. For example, a display device that displays and outputs on a screen can be applied. The apparatus shown in FIG. 3 is actually realized by hardware such as a computer main body and peripheral devices thereof, software installed in the computer, and the like. In particular, the raster conversion unit 14, the lossless decoding processing unit 15, and the watermark removal execution unit 16 are incorporated as part of viewer software for image display processing.

  Here, the processing by the watermark removal execution unit 16 will be described with reference to FIG. As described above, the watermarked image decoded by the lossless decoding processing unit 15 is as shown in FIG. The binary image output from the raster conversion unit 14 is as shown in FIG. When the watermarked image shown in FIG. 2C and the binary image shown in FIG. 2B are input, the watermark removal execution unit 16 performs an addition process for each pixel. At this time, if the result of addition exceeds 255, 256 is subtracted to perform processing for accommodating 0 to 255. That is, it is expressed by 8 bits, and overflow is ignored. As a result, an original image as shown in FIG. When the watermarked image is a color image, the above addition processing with the binary image is performed for each plane of the watermarked image.

(When using multi-valued images as digital watermarks)
In the above example, a binary image is used as a digital watermark, but a multi-valued image may be used as a digital watermark. Specifically, in the raster conversion unit 4 shown in FIG. 1A, after the character code is converted into a binary image, smoothing filter processing for further blurring the edge of the image data is executed. Thereby, when one pixel is expressed by 8 bits, a multi-value image having a maximum of 256 gradations in the range of 0 to 255 is obtained. For example, when smoothing filter processing is executed under a predetermined condition on the binary image shown in FIG. 2B, a multi-valued image as shown in FIG. 3B is obtained. When an original image as shown in FIG. 3A and a multi-valued image as shown in FIG. 3B are input, the embedding process execution unit 5 performs an addition process for each pixel as in the example of FIG. I do. At this time, if the result of addition exceeds 255, 256 is subtracted to perform processing for accommodating 0 to 255. As a result, a watermarked image as shown in FIG. 3C is obtained. When the original image is a color image, the addition process with the multi-valued image as described above is performed for each plane of the original image in the same manner as described above.

  In this case, even when the digital watermark is removed by the digital watermark removal apparatus, the raster conversion unit 14 executes the smoothing filter process. The specific execution condition of the smoothing filter process needs to be the same as that of the raster conversion unit 4 in the digital watermark embedding apparatus. As a result, a multi-valued image as shown in FIG. 3B is obtained. In the watermark removal execution unit 16, unlike the case where the identification image is a binary image, each value of the multi-valued image shown in FIG. 3B is determined from the value of each pixel of the watermarked image shown in FIG. A process of subtracting the pixel value is performed. As a result, an original image as shown in FIG.

  In the above example, the raster conversion means 4 generates a binary image or a multi-valued image as a digital watermark based on the input character code. The value image may be directly input to the embedding process execution unit 5. In this case, the watermarked image is put in circulation after lossless encoding, as described above, but an identification image is attached to a legitimate user. In this case, also in the digital watermark removal apparatus, the identification image is directly input to the watermark removal execution unit 16.

(Attaching identification information in video)
The above example can be used for both still images and moving images. In the above example, whether the image is a still image or a moving image, the character code of the identification information is added to the header of the still image data or the moving image data body, and the information is passed to the user. In the present invention, in the case of a moving image, the method of passing identification information embedded as a digital watermark is also devised, and will be described next. The moving image is configured as a sequence of a plurality of images (still images), and the images constituting the moving image are called frame images. In the present invention, a binary image or a multi-valued image is embedded as a digital watermark in each frame image of such a moving image in the same manner as described above. Further, the first frame image of the original moving image not embedded with the digital watermark is added to the beginning of the moving image that has been embedded. Here, FIG. 4A shows an original moving image composed of N frame images from the first frame to the Nth frame. When such a moving image is input instead of the original image in the digital watermark embedding apparatus as shown in FIG. 1A, the embedding process execution unit 5 performs the same process as when processing a still image, The identification image output from the raster conversion unit 4 is embedded in each frame image. Then, the original frame image is added as it is for the first frame of the original moving image. As a result, a watermarked moving image is obtained. FIG. 4B shows the frame configuration of a watermarked moving image. As shown in FIG. 4B, the processed moving image is composed of a first frame with a watermark and a second frame following the first frame without the watermark. On the side of removing a digital watermark from such a moving image, the digital watermark is removed by an apparatus in which a program that implements a removal rule in accordance with the embedding rule in advance is incorporated. Specifically, first, the value of each pixel of the first frame without watermark, which is the first two frames, is subtracted from the value of each pixel of the first frame with watermark, and embedded. An identification image is obtained. Subsequently, by performing a process of subtracting each pixel of the obtained identification image from each pixel of each frame including the watermark, each frame image from which the watermark is removed is obtained.

(Second Embodiment)
Next, the second embodiment will be described. In the second embodiment, the moving image is embedded. FIG. 5A is a configuration diagram of a digital watermark embedding apparatus according to the second embodiment. In FIG. 5A, 21 is an original image input unit, 22 is a character font storage unit, 23 is an identification information character code input unit, 24 is a raster conversion unit, 25 is an embedding process execution unit, and 26 is a lossless encoding processing unit. , 27 is a watermarked moving image output unit.

  The original moving image input unit 21 has a function of inputting original moving image data to be distributed. The character font storage unit 22, the identification information character code input unit 23, and the raster conversion unit 24 are the same as the character font storage unit 2, the identification information character code input unit 3, and the raster conversion unit 4 shown in FIG. It has a function. The embedding processing execution unit 25 has a function of embedding a binary image output from the raster conversion unit 4 as an electronic watermark in the original moving image input from the original moving image input unit 1. The lossless encoding processing unit 26 has a function of compressing a watermarked image using a lossless encoding method. Here, the lossless encoding method is used because the lossy encoding method that allows the loss of data cannot restore the embedded information and cannot serve as a digital watermark. . Various known techniques can be used as specific processing techniques for lossless encoding. The watermarked moving image output unit 27 is for outputting the lossy compressed watermarked moving image to the outside of the apparatus.

  Here, the process by the embedding process execution unit 25 will be described with reference to FIGS. Consider a case where an nth frame is processed when a moving image is composed of frame images from the first frame to the Nth frame. When performing the processing of the nth frame, when the binary image pixel is “128”, the value of the n−1th frame of the original moving image is used, and when the binary image pixel is “0”, The value of the nth frame of the original moving image is used. For example, if the original image frame n, the original image frame n-1, and the binary image have values as shown in FIGS. 6A, 6B, and 7A, respectively, the nth frame after the embedding process is As shown in FIG. 7B. Further, the identification information from which the binary image is generated is added to the header in the form of a character code. The watermarked moving image after the embedding process is placed in circulation after lossless encoding. Further, the legitimate user is notified of the character font name separately so that the same character font as that used in the embedding apparatus is used.

  Here, FIG. 5B shows a digital watermark removing apparatus used by a user to remove a digital watermark. In FIG. 5B, 31 is a watermarked moving image input unit, 32 is a character font storage unit, 33 is an identification information character code input unit, 34 is a raster conversion unit, 35 is a lossless decoding processing unit, and 36 is a watermark removal execution unit. , 37 are original moving image output units. The watermark removal execution unit 36 performs processing for changing the value of the binary image value “128” in each frame image of the watermarked moving image to the value of the corresponding pixel of the immediately following frame image. By performing this process on all the frame images, an original moving image from which the digital watermark has been removed is obtained.

  FIG. 8 shows a basic concept of processing in the second embodiment. FIG. 8A schematically shows an identification image. In FIG. 8, the shaded rectangular portion indicates that the pixel value is “128”, and the other portions indicate that the pixel value is “0”. FIG. 8B is a conceptual diagram of watermark embedding processing. When the process of embedding the identification image as a digital watermark as shown in FIG. 8A is performed, the value of the pixel in the original first frame at the same position as the pixel having a value of “128” in the identification image is changed in the second frame. A new value of the pixel at the same position is used. Similarly in the second and subsequent frames, the value of the pixel in the original frame at the same position as the pixel having the value “128” in the identification image is set as the value of the pixel at the same position in the subsequent frame. Further, the value of the pixel in the original final frame at the same position as the pixel having the value of “128” in the identification image is set as a new value of the pixel at the same position in the first first frame. When removing the digital watermark, a process as shown in FIG. 8C is performed. That is, the value of the pixel in the second frame at the same position as the pixel having the value “128” in the identification image is set as a new value of the pixel at the same position in the first frame. Similarly, in the third and subsequent frames, the value of the pixel in the frame at the same position as the pixel having the value “128” in the identification image is set as the new value of the pixel at the same position in the preceding frame. The value of the pixel in the last frame at the same position as the pixel having the value “128” in the identification image is also set as a new value of the pixel at the same position in the first first frame.

(Third embodiment)
Next, a third embodiment will be described. The third embodiment is intended to embed a digital watermark in a lossy-compressed moving image. Lossy compression is a compression method that can reduce the compression rate to 1/5 to 1/10, although it cannot be completely restored to the original state when it is decoded because data is lost during compression. .

  In particular, as lossy compression of digital video data recorded in a current VTR, a lossy compression method such as a commercial digital beta cam, a commercial DV cam, and a consumer DV is used. In both of these, the amount of data is reduced by performing compression by discrete cosine transform for each frame. Here, the compression method of the commercial DV cam and the consumer DV will be specifically described.

  First, FIG. 9A shows a schematic representation of an original video signal in a state in which a video is photographed with a TV camera or the like and digitized. In FIG. 9, the left-right direction is a time-series direction, and the time progresses as it goes to the right. The original video signal shown in FIG. 9A is composed of three planes of R, G, and B, each frame being the three primary colors of light. Here, it is assumed that 30 frames per second and 8 bits are assigned to each color (plane) of each pixel. For example, a digital video signal recorded for 10 seconds becomes a frame group composed of 300 frames and 900 planes. The number of pixels in each frame image is 720 × 480.

  In the DV format, the digital video signal as described above is processed in units of frames as follows. First, the pixel signals of the R, G, and B planes are converted into Y, U, and V using the following [Equation 1].

[Formula 1]
Y = 0.299R + 0.587G + 0.114B
U = -0.1684R-0.3316G + 0.5B
V = 0.5R-0.4187G-0.0813B

  Since the above [Formula 1] involves a decimal point operation, the original values of R, G, and B cannot be restored from Y, U, and V converted to integer values. In this state, the lossy type is basically used. become. Further, for the U plane and the V plane, the pixels are thinned out in half in the vertical direction and the horizontal direction. For example, in the case of an image of 720 × 480 pixels, an image of 360 × 240 pixels is obtained, and the number of pixels is reduced to ¼. The state of the video signal at this time is shown in FIG. Subsequently, in units of 8 × 8 pixels, one unit of the U plane and one unit of the V plane are allocated to one unit of the Y plane to form a block composed of a total of six units of pixels. Since one pixel is 1 byte, the data amount of this block is 384 bytes. Subsequently, one block is compressed into 80-byte data by performing DCT transform (discrete cosine transform), quantization, and variable length coding on this block.

  When blocks are defined as described above, one original frame is represented by 45 × 30 blocks. In the DV system, calculation processing between planes in the same frame is performed, but calculation between frames is not performed. For this reason, the concept of a plane disappears, but if there are n frames as shown in FIG. 9, they are composed of n frames even after compression. The frame numbers 1 to n are also taken over as they are.

  FIG. 10A shows a digital watermark embedding apparatus according to the third embodiment of the present invention for the above-mentioned lossy-type compressed moving image data. In FIG. 10A, 41 is an original moving image input unit, 42 is a character font storage unit, 43 is an identification information character code input unit, 44 is a raster conversion unit, 45 is an embedding process execution unit, and 47 is a watermarked moving image output unit. It is.

  The raster conversion unit 44 has a function of converting the character code input from the identification information character code input unit 3 into a binary image in a raster data format with reference to the character font storage unit 2. However, the difference from the first and second embodiments is that the number of pixels of the generated binary image is the same as the number of blocks of each frame image constituting the moving image. Therefore, when the compression method is the DV method, the generated binary image has a size of 45 × 30 pixels. The embedding process execution unit 45 executes a process of embedding the binary image output from the raster conversion unit 44 on the original moving image input from the original moving image input unit 41, and the electronic watermark is embedded in the original moving image. It has a function to output as a watermarked video. Specifically, when performing processing of the nth frame, if the pixel of the binary image is “128”, the value of the corresponding block of the n−1th frame of the original moving image is used and the pixel of the binary image is used. Is “0”, the value of the corresponding block of the Fth frame of the original moving image data is used. That is, the processing method is the same as that of the second embodiment except that each pixel of the original image frame n and the original image frame n−1 shown in FIGS. 6 and 7 is replaced with each block. It becomes. The watermarked moving image after the embedding process is placed in circulation. In addition, the legitimate user is notified of the character font name so that the same character font as that used in the embedding apparatus is used.

  Here, FIG. 10B shows a digital watermark removal apparatus used by a user to remove a digital watermark. In FIG. 10B, 51 is a watermarked moving image input unit, 52 is a character font storage unit, 53 is an identification information character code input unit, 54 is a raster conversion unit, 56 is a watermark removal execution unit, and 57 is an original moving image output unit. It is. The watermark removal execution unit 56 performs a process of changing the value of the binary image value “128” in each frame image of the watermarked moving image to the value of the corresponding block of the immediately following frame image. By performing this process on all the frame images, an original moving image from which the digital watermark has been removed is obtained.

It is a block diagram of the apparatus which implement | achieves the digital watermark embedding method which concerns on 1st Embodiment. It is a figure which shows the mode of the embedding process of the digital watermark by 1st Embodiment. It is a block diagram of the apparatus which implement | achieves the digital watermark removal method which concerns on 1st Embodiment. It is a figure explaining the case where identification information is embedded in a moving image. It is a block diagram of the apparatus which implement | achieves the digital watermark embedding method based on 2nd Embodiment. It is a figure which shows the mode of the embedding process of the digital watermark by 2nd Embodiment. It is a figure which shows the mode of the embedding process of the digital watermark by 2nd Embodiment. It is a figure which shows the basic concept of the embedding process of the digital watermark by 2nd Embodiment. It is a figure which shows the video signal obtained by the intermediate | middle process of the original video signal which is not compressed and lossy compression. It is a block diagram of the apparatus which implement | achieves the digital watermark embedding method based on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Original image input part 2, 12 ... Character font memory | storage part 3, 13 ... Identification information character code input part 4, 14 ... Raster conversion part 5 ... Embedding process execution part 6. Lossless encoding processing unit 7: watermarked image output unit 11 ... watermarked image input unit 15 ... lossless decoding processing unit 16 ... watermark removal execution unit 17 ... original image output unit

Claims (14)

An identification image creating step of preparing identification information to be embedded as an electronic watermark in the original image and creating an identification image corresponding to the size of the original image based on the identification information;
An embedding process execution step of obtaining a watermarked image in which an electronic watermark is embedded in the original image by adding the value of the corresponding pixel in the identification image to the value of each pixel of the original image;
An identification information attaching step of attaching identification information for creating the identification image necessary for restoring the original image from the watermarked image on the user side to the watermarked image;
A method for embedding a digital watermark, comprising: In claim 1,
The identification information is in the form of a character code,
The identification image creating step uses a character font prepared in advance to convert the character code into a binary identification image having values of 0 and 128, and further smoothes the edges of the binary identification image. An electronic watermark embedding method characterized in that a multi-value identification image having a maximum of 256 gradations in a range of 0 to 255 is created by performing processing. In claim 1,
The original image is composed of three planes of R, G, and B, and is an image of 256 gradations each having a value of 0 to 255. When the identification image is a monochrome image having a value of 0 to 255, In the embedding process execution stage, addition processing is performed three times using the same identification image for the three planes, and when a digit overflow exceeding 8 bits occurs in each pixel, the overflow is ignored. An electronic watermark embedding method characterized by the above. A method of embedding a digital watermark for each original frame image constituting an original video,
An identification image creating step of preparing identification information to be embedded as a digital watermark and creating an identification image corresponding to the size of the original frame image based on the identification information;
An embedding process executing step of obtaining a watermarked frame image in which a digital watermark is embedded in the original frame image by adding a value of a corresponding pixel in the identification image to a value of each pixel of the original frame image; ,
As identification image reproduction information for creating the identification image necessary for restoring the original frame image from the watermarked frame image on the user side, a specific original frame image among the original frame images constituting the moving image. A reproduction information attachment step for attaching a watermarked video composed of a watermarked frame image,
A method for embedding a digital watermark, comprising: A method of embedding a digital watermark into an original moving image composed of a plurality of original frame images,
An identification image creating step of preparing identification information to be embedded as a digital watermark and creating a binary identification image that takes a first value and a second value based on the identification information;
Among the pixels of each original frame image, the corresponding pixel group whose pixel value of the identification image is the first value is replaced with the value of the pixel group of the adjacent original frame image at the same spatial location. An embedding process execution stage for obtaining a watermarked frame image in which a digital watermark is embedded in the original frame image,
An identification information attachment step of attaching identification information for creating the identification image necessary for restoring the original frame image from the watermarked frame image on the user side to the watermarked video;
A method for embedding a digital watermark, comprising: In claim 5,
The identification information is in the form of a character code, and in the identification image creation step, the character code is converted into a binary identification image having a first value and a second value using a character font prepared in advance. An electronic watermark embedding method comprising: converting and attaching the character code as the identification information to the watermarked moving image in the identification information attaching step. In claim 5,
In the case where the original frame image is composed of three RGB planes, the embedding process execution step assigns three pixel groups at the same location to the three corresponding planes of the adjacent original frame image with respect to the three planes. A method for embedding a digital watermark, characterized in that a process for replacing three pixel groups in a plane is performed. In claim 5,
The original frame image is compressed by the lossy encoding method;
The identification image creating step creates a binary image having the same number of pixels as the number of encoded blocks obtained by encoding a predetermined number of pixels as an identification image according to the specification of the lossy encoding method,
The digital watermark embedding method, wherein the embedding processing execution step is to obtain a watermarked frame image in which the encoded block is regarded as one pixel and the digital frame is embedded in the original frame image. In claim 1 or claim 5,
An electronic watermark embedding method, characterized by further performing lossless encoding that can restore the watermarked image or watermarked moving image to the watermarked image or watermarked moving image to which the identification image reproduction information is attached .   A recording medium storing a watermarked image or a watermarked moving image obtained by the digital watermark embedding method according to any one of claims 1 to 9.   10. A watermarked image or watermarked moving image transmission method comprising transmitting a watermarked image or watermarked moving image obtained by the digital watermark embedding method according to any one of claims 1 to 9 over a network or the like. . An identification image creation step of reading identification information embedded as the digital watermark in the watermarked image obtained by embedding the digital watermark into the original image, and creating an identification image corresponding to the size of the original image based on the identification information When,
A watermark removal execution step of obtaining an original image obtained by removing a digital watermark from the watermarked image by adding a value of a corresponding pixel in the identification image to a value of each pixel of the watermarked image;
A method for removing a digital watermark, comprising: A method for removing a digital watermark from a watermarked video in which a digital watermark is embedded for each original frame image constituting the original video,
Identification image creation that creates an identification image by performing a difference process between a specific frame image in which a digital watermark is not embedded and a frame image in which the digital watermark is embedded with respect to the specific frame image among frames constituting a watermarked moving image Stages,
An original image obtained by removing a digital watermark from the watermarked image is obtained by adding the value of the corresponding pixel in the identification image to the value of each pixel of each watermarked frame image constituting the watermarked moving image. A watermark removal execution stage to obtain;
A method for removing a digital watermark, comprising: A method of removing a digital watermark from a watermarked video in which a digital watermark is embedded with respect to an original video composed of a plurality of original frame images,
An identification image creating step of reading identification information embedded as a digital watermark and creating a binary identification image that takes a first value and a second value based on the identification information;
Among the pixels of the watermarked frame image in which the digital watermark is embedded, the pixel group of the adjacent original frame image that is spatially identical to the pixel group in which the pixel value of the corresponding identification image is the first value A watermark removal execution step of obtaining an original image obtained by removing a digital watermark from the watermarked frame image by replacing the value with
A method for removing a digital watermark, comprising:

Images