JP2007081707A - Information embedding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information embedding device capable of representing in such form as a third party cannot decrypt, even if the information is a large data such as graphics or image when distributing the information in an image as secrecy. <P>SOLUTION: An information embedding device 100 for embedding information on a paper comprises a secret region converter 105 which applies image conversion on the image in a secret region of the paper, and a watermark information composite 104 which embeds a restoring information for restoring to an original image in the image after image conversion. The secret region converter divides the secret region into a plurality of regions, and converts the position of each divided region. With this configuration, the information can be represented in such form as a third party cannot decrypt even if the information is a large data such as graphics or image when distributing the information in the image as secrecy, by embedding the restoring information for restoring an original image in the image that has been image-converted for secret information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information embedding device, and more particularly, to an information embedding device for describing information that the public does not want to be known on paper.

  In recent years, with the spread of the Internet, various data have been converted over the Internet. A typical example of this is electronic commerce, where data such as quotations, orders, invoices, and receipts are converted electronically, enabling real-time commerce between two spatially separated parties. . In addition, for business processes such as approval in general companies, a workflow system is used in which this data is converted on an in-house network and all of them are processed electronically.

  In such cases, it is necessary to keep a record of transactions and approvals in order to resolve disputes and ensure fairness, and print and store data on paper for use by third parties. There are many things. For this purpose, the electronic book storage method allows storage by electronic means, but in reality, paper storage is frequently used because of complicated procedures. From the application by the applicant to the approval by the approver can also be done electronically by the workflow system, but the actual approval procedure is often performed by imprinting the data printed on paper. At present, the subsequent information transmission is often performed by paper.

  Also, in the data transmission method using paper, the entire contents of the data are written on the paper, so that the data content is exposed to the eyes of a third party or an outsider (for example, an accountant). Will be unnecessarily leaked to third parties.

  In order to prevent such a situation, it is necessary to prepare a separate sheet of paper concealing data (confidential information) that is to be classified. However, administrative procedures such as accounting are performed by circulating the document that has been approved as an original, and other documents that are partly concealed are not stamped (not the original) and are therefore processed. I can't. In addition, if the confidential information is deleted from the original, it will not be possible to know what confidential information was written there, so even internal parties lose the opportunity to access the confidential information. It will be. Therefore, there is a need for a method that allows confidential information to be described in a protected form in the original document and that the parties can recognize and access its existence.

  For such problems, Japanese Patent No. 3275766 “Concealed Image Processing System” (Patent Document 1) and Japanese Patent Application Laid-Open No. 2004-058410 “Confidential Information Printing Method, Confidential Information Printing System, and Confidential Information Printing Device” In (Patent Document 2), a portion corresponding to confidential information is extracted from the data to be printed, and the data expressed by means other than characters (substitute means) is printed instead. Then, a message to the effect that it is expressed by the substitute means is displayed in the part, and the parties are made aware of the existence of confidential information.

  However, in the technologies described in Patent Documents 1 and 2, confidential information is converted into data and recorded on paper. However, if the confidential information is a graphic or an image, the amount of data increases, so all the confidential information is recorded on the paper. There was a problem that it was difficult to do.

Japanese Patent No. 3275766 JP 2004-058410 A JP 2004-171762 A

  The present invention has been made in view of the above-described problems of the background art. The object of the present invention is to distribute information in an image in a secret manner when the information is large data such as figures and images. However, it is to provide a new and improved information embedding device, information extraction device, and computer program that can be expressed in a form that cannot be decoded by a third party.

  In order to solve the above problems, according to a first aspect of the present invention, an information embedding device for embedding information on a paper surface is provided. An information embedding device according to the present invention includes an image conversion unit (102, 103) that performs image conversion on an image in a specific area on a paper surface, and restores the original image before image conversion to the image that has been subjected to the image conversion. And a restoration information embedding unit (104) for embedding restoration information to be performed (claim 1). Here, the restoration information embedding unit can embed the restoration information on a paper surface using a digital watermark technique. Such a digital watermark may be visible or invisible.

  According to such a configuration, the information in the image is concealed by performing image conversion of the information to be concealed (confidential information), and embedding the restoration information for restoring the original image before the image conversion in the image. In the case of distribution, even if the information is large data such as graphics and images, it can be expressed in a form that cannot be read by a third party.

  Various methods can be employed as the image conversion method. For example, the image conversion unit may divide the specific area into a plurality of areas and convert the positions of the divided areas (claim 2).

  Further, the image conversion unit may divide the specific area into a plurality of areas, and linearly convert each of the divided areas. Here, the linear transformation is a transformation f having a property of f (ax + by) = af (x) + bf (y). Specifically, rotation, vertical transformation, left-right transformation, enlargement, reduction, etc. Conversion, or a combination of these. According to such a configuration, when confidential information in an image is concealed and distributed, the confidential area (confidential information area) is randomized in a more complicated manner, so that it can be expressed in a form that cannot be decrypted by a third party. it can.

  Alternatively, the above two conversion methods may be used in combination. That is, the image conversion unit divides the specific area into a plurality of areas, converts the position of each divided area, and performs linear conversion (rotation, upside down, left / right inversion, enlargement, reduction) for each of the divided areas. Or a combination thereof) (Claim 4).

  The restoration information may include position information (coordinate values of confidential information) of the specific area. Here, the position information of the specific area is information on the coordinate value of the specific area, for example. By including such position information in the restoration information (randomization rule), the restoration information can be given as position information of a specific area.

  In order to solve the above-described problem, according to a second aspect of the present invention, an information extraction device that reads information from a paper surface is provided. The information extraction device according to the present invention includes an information extraction unit (202) that reads the restoration information from an image in which restoration information for restoration to an original image before image conversion is performed and a predetermined image conversion is performed; And an image restoration unit (203, 204) for restoring the original image from the image subjected to the image conversion using the restoration information.

  According to such a configuration, the information in the image is concealed by performing image conversion of the information to be concealed (confidential information), and embedding the restoration information for restoring the original image before the image conversion in the image. When distributing, even if the information is large data such as figures and images, it can be expressed in a form that cannot be decoded by a third party, and the converted image can be easily restored. It is.

  In the information extraction apparatus, the predetermined image conversion may be performed by dividing a specific area on a paper surface into a plurality of areas and converting the positions of the divided areas.

  In addition, the predetermined image conversion is performed by dividing a specific area on the paper into a plurality of areas, and performing linear conversion (rotation, upside down, left / right inversion, enlargement, reduction, etc., or a combination thereof) for each divided area. It may be a thing.

  The predetermined image conversion is performed by dividing a specific area on the paper into a plurality of areas, converting the position of each divided area, and performing linear conversion (rotation, upside down, left / right inversion) for each divided area. , Enlarged, reduced, etc., or a combination thereof).

  Further, the restoration information may include position information (coordinate values of confidential information) of the specific area.

  According to another aspect of the present invention, there are provided a program for causing a computer to function as the information embedding device or the information extracting device, and a computer-readable recording medium on which the program is recorded. Here, the program may be described in any programming language. In addition, as a recording medium, for example, a recording medium that is currently used as a recording medium capable of recording a program, such as a CD-ROM, a DVD-ROM, or a flexible disk, or any recording medium that is used in the future should be adopted. Can do.

  In the above description, the reference numerals in parentheses attached to the constituent elements are merely shown as examples of corresponding constituent elements in the embodiments and drawings described below for easy understanding. It is not limited to.

  As described above, according to the present invention, when information in an image is concealed and distributed, even if the data is large data such as a figure or an image, it is expressed in a form that cannot be decoded by a third party. Can do. Other effects of the present invention will be described in the following best mode for carrying out the invention.

  Hereinafter, preferred embodiments of an information embedding device according to the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
A first embodiment of the present invention will be described.
FIG. 1 is an explanatory diagram showing a schematic configuration of the first embodiment.

  As shown in FIG. 1, the present embodiment is a system including a transmitting side 10 that transmits information to be kept secret (hereinafter also referred to as “confidential information”) and a receiving side 20 that receives confidential information.

(Sender)
The transmitting side 10 generates a watermarked image 12 from an image 11 with confidential information including an area in which confidential information is described (hereinafter referred to as “confidential area”). In the watermarked image 12, the confidential area of the confidential information-containing image 11 is imagewise randomized so that the confidential portion cannot be deciphered by human eyes. As the watermark information, the randomized confidential area is the original form. Contains information for restoring. Details will be described later. The watermark information may be encrypted by a common key encryption system or a secret key encryption system.

  The watermarked image 12 created on the transmission side 10 is electronically transmitted to the reception side 20 via an electronic network 50 such as the Internet, or is printed by the printer 30 and transmitted in a paper state.

  On the receiving side 20, the watermarked image 21 transmitted from the information embedding device 100 is acquired. When the information embedding apparatus 100 transmits the data in a paper state, the watermarked image 21 is obtained by imaging the information on the paper surface by the scanner 40. On the receiving side 20, the watermark information is restored from the watermarked image 21, the randomized confidential area is restored to its original form that can be deciphered by human eyes, and a restored image 22 is created. Details will be described later.

  Details of the transmitting side 10 and the receiving side 20 will be described below.

FIG. 2 is a detailed configuration diagram of the transmission side 10.
The transmission side 10 includes an information embedding device 100 as shown in FIG. The information embedding device 100 is configured to receive an image 101 and output a watermarked image 106. 1 corresponds to the image 101 in FIG. 2, and the watermarked image 12 in FIG. 1 corresponds to the watermarked image 106 in FIG.

  The information embedding device 100 includes a confidential area conversion unit 105 and a watermark information synthesis unit 104. The image 101 is a document image including a confidential area, and the confidential area conversion unit 105 converts the confidential area in the image into an image that cannot be deciphered by humans.

  The confidential area conversion unit 105 of this embodiment includes a confidential area division unit 102 and a block image position conversion unit 103. The confidential area dividing unit 102 divides the confidential area in the image into a plurality of blocks. Hereinafter, each divided block is referred to as a “block image”. The block image position conversion unit 103 randomizes the inside of the confidential area by rearranging the positions of the divided block images.

  The watermark information synthesizing unit 104 uses the coordinate value of the confidential area and the rules for randomization as watermark information, embeds the watermark in the image in which the confidential area is randomized, and outputs the watermarked image 106.

  The watermark information synthesizing unit 104 can be realized, for example, by the technique described in Japanese Patent Application Laid-Open No. 2004-171762 “Watermark information embedding device and watermark information detecting device” (Patent Document 3) filed and published by the applicant of the present application. It is. The watermark image forming unit described in Patent Document 3 performs N-ary encoding (N is 2 or more) of digitized confidential information converted into a numerical value, and assigns each symbol of the codeword to a signal prepared in advance. It has a function. A signal represents a wave having an arbitrary direction and wavelength by arranging dots in a rectangular area of an arbitrary size, and a symbol is assigned to the direction and wavelength of the wave. A watermark image is an image in which these signals are arranged according to a certain rule.

  The watermarked document image composition unit described in Patent Document 3 has a function of generating a watermarked document image by superimposing the document image and the watermark image. The value of each pixel of the watermarked document image is calculated by a logical product operation (AND) of the corresponding pixel values of the document image and the watermark image. That is, if either the document image or the watermark image is 0 (black), the pixel value of the watermarked document image is 0 (black), otherwise 1 (white).

  The watermark information combining unit 104 according to the present embodiment can be realized by the watermark image forming unit and the watermarked document image combining unit disclosed in Patent Document 3. However, the technique described in Patent Document 3 is merely an example for realizing the watermark information synthesis unit 104, and the present invention is not limited thereto.

(Receiver)
FIG. 3 is a detailed configuration diagram of the receiving side 20.
The receiving side 20 includes an information extraction device 200 as shown in FIG. The information extraction apparatus 200 is configured to receive a watermarked image 201 and output a restored image 205.

  The information extraction apparatus 200 according to the present embodiment includes a watermark information extraction unit 202, a confidential area division unit 203, and a block image position conversion unit 204.

  The watermark information extraction unit 202 extracts watermark information from the watermarked image 201. The watermark information extraction unit 202 can be realized by the technique described in Patent Document 3, for example. The watermark detection unit described in Patent Document 3 performs filter processing on an input image and detects an embedded signal. Then, it has a function of restoring symbols from the detected signal and extracting embedded confidential information. As described above, the signal embedded in the input image represents a wave having an arbitrary direction and wavelength by arranging dots in a rectangular area of an arbitrary size, and assigns a symbol to the direction and wavelength of the wave. It is a thing. The watermark detection unit uses a two-dimensional wavelet filter (for example, a Gabor filter) that can simultaneously define the frequency and direction of the wave and the influence range in order to detect the signal unit from the input image.

  The watermark information extraction unit 202 according to the present embodiment can be realized by the watermark detection unit disclosed in Patent Document 3. However, the technique described in Patent Document 3 is merely an example for realizing the watermark information extraction unit 202, and the present invention is not limited to this.

  The confidential area dividing unit 203 identifies the confidential area from the watermarked image based on the coordinate value of the confidential area extracted from the watermark information, and divides the confidential area into a plurality of blocks as in the information embedding device 100. The block image position conversion unit 204 restores the original confidential area based on the randomization rule extracted from the watermark information and outputs the restored image 205.

  The present embodiment is configured as described above.

(Operation of the first embodiment)
Next, the operation of this embodiment will be described. In the following description, it is assumed that the watermarked image is printed by a printer and transmitted to the receiving side by paper.

(Sender)
FIG. 4 is a flow of the confidential area conversion unit 105 of the information embedding device 100. FIG. 5 shows an example of an image and a confidential area. In the example shown in FIG. 5, the confidential area 300 is a part of the image 101, but the present invention is not limited to this. The confidential area may be the entire image, or a plurality of confidential areas may exist in one image. Hereinafter, a description will be given with reference to FIGS.

  In step S301, the confidential area 300 is cut out from the image 101. In step S302, the confidential area 300 is divided into a plurality of block images. FIG. 6 is an example in which the confidential area 300 of FIG. 5 is divided into a plurality of block images. In the example of FIG. 6, it is divided into 5 parts in the horizontal direction and 6 parts in the vertical direction. A number is assigned to each of the divided block images. For example, the block image in the first row and the first column is B11, the block image in the first row and the second column is B12, and the like.

  In step S303, a position conversion table for randomizing the confidential area image-wise is created. FIG. 7 is an example of a position conversion table. In the position conversion table of FIG. 7, for example, “54” in the first row and the first column (X1 in the figure) means that B54 is arranged at the position of B11. In addition, the sixth row and fifth column (reference numeral X2 in the figure) being “25” means that B25 is arranged at the position of B65. Note that the position conversion table need not be created after step S302, but may be created at least before step S304.

  In step S304, the block image position is converted in accordance with the position conversion table. FIG. 8 shows an example in which the position of the block image is converted. In the confidential area 301 after the block image conversion, the confidential area is randomized imagewise.

  In step S305, the randomized confidential area is pasted on the confidential area 400 of the image 101. FIG. 9 shows an example in which the confidential area 400 after the block image position conversion is pasted at the position of the confidential area of the image 101.

The watermark information synthesis unit 104 in FIG. 2 embeds watermark information in an image in which the confidential area is randomized. The watermark information includes, for example, the following (Information 1) to (Information 3). When there are a plurality of confidential areas, (Information 1) to (Information 3) are embedded by the number of confidential areas.
(Information 1): Position and size of confidential area (Information 2): Number of block divisions of confidential area (Information 3): Position conversion table

  Also, if the information can identify the size and position of the block image that has undergone position conversion, for example, the size and position information for each block image may be embedded in place of other information instead of (Information 1) and (Information 2). Good.

  For details of the watermark information embedding method, the technique described in (Patent Document 3) is adopted.

(Receiver)
On the receiving side, the previous (information 1) to (information 3) are restored from the received watermarked image using the information extraction method described in (Patent Document 3).

  First, the confidential area is cut out from the watermarked image based on (Information 1). Next, the confidential area is divided into block images based on (information 2). Finally, based on (information 3), the block image whose position has been converted by the procedure reverse to that of the information embedding device 100 is returned to the original position, and pasted to the original position of the watermarked image.

  Here, if the technique described in Japanese Patent Application No. 2003-122260 “Detection Method of Confidential Information Embedded in Print Document” (Patent Document 4) filed by the applicant of the present application is used, a watermarked image is generated by the information embedding device 100. Even when printed on paper and read by a scanner on the receiving side, the position of the confidential area can be accurately identified from the read image, so that the original confidential information can be restored more accurately.

(Effects of the first embodiment)
As described above, according to the present embodiment, when confidential information in an image is concealed and distributed, even if the confidential information is large data such as graphics or images, it cannot be decrypted by a third party. Can be expressed.

(Second Embodiment)
A second embodiment of the present invention will be described. In the present embodiment, the difference from the first embodiment will be mainly described.

(Sender)
FIG. 10 is a block diagram of the transmission side of this embodiment.
The difference from the first embodiment (FIG. 2) is that a block image conversion unit 1103 is inserted. That is, in the information embedding device 1100 of the present embodiment, the confidential area conversion unit 1106 further includes a block image conversion unit 1103 in addition to the configuration of the confidential area conversion unit 105 (FIG. 2) of the first embodiment. And

  The block image conversion unit 1103 applies reversible image processing such as rotation and inversion to the block image. As a result, the confidential area can be randomized more complicatedly.

  In FIG. 10, an image 1101, a confidential area dividing unit 1102, a block image position converting unit 1104, a watermark information combining unit 1105, and a watermarked image 1107 are the image 101, the confidential area dividing unit 102, and the block image position converting shown in FIG. Since this is substantially the same as the unit 103, the watermark information synthesis unit 104, and the watermarked image 106, duplicate description is omitted.

(Receiver)
FIG. 11 is a configuration diagram of the receiving side according to the second embodiment.
The difference from the first embodiment (FIG. 3) is that a block image conversion unit 1205 is inserted. That is, the information extraction apparatus 1200 of the present embodiment is characterized by further including a block image conversion unit 1205 in the configuration of the information extraction apparatus 200 (FIG. 3) of the first embodiment.

  The block image conversion unit 1205 restores the original image by inversely converting the block converted by the block image conversion unit 1103 in FIG.

  In FIG. 11, a watermarked image 1201, a watermark information extracting unit 1202, a confidential area dividing unit 1203, a block image position converting unit 1204, and a restored image 1205 are respectively a watermarked image 201, a watermark information extracting unit 202, and a confidential image. Since it is substantially the same as the area dividing unit 203, the block image position converting unit 204, and the restored image 205, duplicate description is omitted.

  The present embodiment is configured as described above.

(Operation of Second Embodiment)
Next, the operation of this embodiment will be described. In the following description, it is assumed that the watermarked image is printed by a printer and transmitted to the receiving side by paper.

(Sender)
FIG. 12 is a flow of the confidential area conversion unit 1106 of the information embedding device 1100. The difference from FIG. 4 is that image conversion table creation (step S1303) and block image conversion (step S1304) are performed.

  Image conversion refers to performing linear conversion combining rotation, left / right or upside down, enlargement, reduction, etc., or a combination thereof for each block image. For example, as shown in FIG. 13, conversion symbols and conversion operations for the conversion symbols are determined in advance, and a conversion table as shown in FIG. 14 is created (step S1303). Conversion for each of the divided block images is performed according to the image conversion table (step S1304). In the example of FIG. 14, for example, “34” is assigned to the block image B33 (third row, third column, symbol Y1 in the figure). “34” is “rotate 270 degrees after turning upside down” in the conversion rule of FIG. This means that after rotating B33 upside down, a 270 degree rotation process is performed. Further, “24” is assigned to the block image B51 (5th row, 1st column, symbol Y2 in the figure), which means that the block image is reversed 270 degrees and then rotated 270 degrees.

  After image conversion is performed on each block image, the position is converted in step S1306 based on the position conversion table created in step S1305. FIG. 15 shows an example in which the position of a block image that has undergone image conversion is converted based on the position conversion table of FIG. In FIG. 7, since it is instructed to arrange B51 at the position of B12, the block image B51 rotated 270 degrees after being horizontally reversed is arranged at the position of B21.

  The block image conversion (steps S1303 and S1304) and the block image position conversion (steps S1305 and S1306) may be performed in the reverse order. That is, after performing block image position conversion first, it is also possible to perform linear conversion such as rotation, left and right or upside down, enlargement, and reduction for each block image.

Similarly to the following (first embodiment), as shown in FIG. 16, the randomized confidential area 1400 is pasted on the original image 1101, and watermark information is embedded. As watermark information, in addition to (information 1) to (information 3), for example, the following (information 4) and (information 5) are added. The conversion rule can be omitted by holding in advance a common rule on the transmission side and the reception side.
(Information 4): Conversion rule (Information 5): Image conversion table

(Receiver)
On the receiving side, the previous (information 1) to (information 4) are restored from the received watermarked image using the information extraction method described in (Patent Document 3).

  First, the confidential area is cut out from the watermarked image based on (Information 1). Next, the confidential area is divided into block images based on (information 2). Next, based on (information 4) and (information 5), the block image is inversely converted by a procedure reverse to that on the transmission side. Finally, based on (information 3), the block image whose position has been converted by the reverse procedure of the transmission side is returned to the original position, and is pasted to the original position of the watermarked image.

  Also in this embodiment, if the technique described in Japanese Patent Application No. 2003-122260 “Detection Method of Confidential Information Embedded in Print Document” (Patent Document 4) filed by the applicant of the present application is used, the information embedding apparatus 1100 performs watermarking. Even when the incoming image is printed on paper and read by the scanner on the receiving side, the position of the confidential area can be accurately identified from the read image, so that the original confidential information can be restored more accurately.

(Effect of 2nd Embodiment)
As described above, according to the present embodiment, when confidential information in an image is concealed and distributed, the confidential area is more complicated and randomized, so that it can be expressed in a form that cannot be deciphered by a third party. can do.

  As described above, as the first and second embodiments, examples of the information embedding device and the information extracting device according to the present invention have been described. Such an information embedding device or information extracting device can cause a computer to function as an information embedding device and an information extracting device by incorporating a computer program for realizing the above functions into the computer. Such a computer program can be distributed in the market in a form recorded on a predetermined recording medium (for example, a CD-ROM) or downloaded via an electronic network.

  The preferred embodiments of the information embedding device according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  The present invention can be used for an information embedding device, and in particular, can be used for an information embedding device for describing information that is not desired to be known to the public on paper.

It is explanatory drawing which shows the structure of 1st Embodiment. It is explanatory drawing which shows the structure by the side of the transmission concerning 1st Embodiment. It is explanatory drawing which shows the structure of the receiving side concerning 1st Embodiment. It is a flowchart which shows the process of the confidential information generation part concerning 1st Embodiment. It is explanatory drawing which shows the example of an image and a confidential area. It is explanatory drawing which shows the example of a confidential area division | segmentation. It is explanatory drawing which shows the example of a position conversion table. It is explanatory drawing which shows the example of the confidential area where the block position was converted. It is explanatory drawing which shows the example of the image which affixed the confidential area | region where the position was converted. It is explanatory drawing which shows the structure of the transmission side concerning 2nd Embodiment. It is explanatory drawing which shows the structure of the receiving side concerning 2nd Embodiment. It is a flowchart which shows the process of the confidential information generation part concerning 2nd Embodiment. It is explanatory drawing which shows the example of a conversion rule. It is explanatory drawing which shows the example of an image conversion table. It is explanatory drawing which shows the example of the confidential area by which image conversion and position conversion were carried out. It is explanatory drawing which shows the example of the image which affixed the confidential area by which image conversion and position conversion were carried out.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Transmission side 11 Image containing confidential information 12 Image with watermark 20 Reception side 21 Image with watermark 22 Restored image 30 Printer 40 Scanner 100 Information embedding device 101 Image 102 Confidential area dividing unit 103 Block image position converting unit 104 Water mark information synthesizing unit 105 Confidential Area conversion unit 106 Watermarked image 200 Information extraction device 201 Watermarked image 202 Watermark information extraction unit 203 Confidential area division unit 204 Block image position conversion unit 205 Restored image

Claims (5)

An information embedding device for embedding information on paper,
An image conversion unit that performs image conversion on an image in a specific area on the paper;
A restoration information embedding unit that embeds restoration information for restoring the original image before image conversion into the image that has undergone the image conversion;
An information embedding device characterized by comprising:   The information embedding apparatus according to claim 1, wherein the image conversion unit divides the specific area into a plurality of areas and converts the position of each divided area.   The information embedding apparatus according to claim 1, wherein the image conversion unit divides the specific region into a plurality of regions, and linearly converts each of the divided regions.   The information according to claim 1, wherein the image conversion unit divides the specific region into a plurality of regions, converts the position of each divided region, and linearly converts each divided region. Implantation device.   The information embedding apparatus according to claim 1, wherein the restoration information includes position information of the specific area.

Images