JP5030875B2 - Information processing apparatus, program, additional image generation method, and information extraction method - Google Patents

Description

  The present invention relates to an information processing apparatus, a program, an additional image generation method, and an information extraction method.

  2. Description of the Related Art In recent years, a technology has been developed that provides added value to a printed material by embedding some information separately from the description content in a printed material that is one of recording media. Examples of the added value include security of printed matter, content protection, and association with original digital data and Web pages. In order to realize these, a technique for embedding information by drawing a certain pattern on a printed matter has been developed.

  As a conventionally known technique, there is a barcode, but there is a problem that it is necessary to secure an area for embedding the barcode on the paper surface, and in the case of security, the barcode and the printed matter are separated. . Recently, as an information embedding technique other than a barcode, there is a technique for drawing a pattern that is not conspicuous on the background of a printed matter.

  For example, in Patent Document 1, as a method of multiplexing and printing additional information on image information, header information is generated from the size information of the additional information and its error correction code information, and the information is multiplexed with the additional information together with the image information. A processing apparatus and method are described.

  Patent Document 2 describes a printing apparatus for generating two-dimensional code information by two-dimensionally dispersing code information and corresponding error correction code information and printing the information on a recording medium. .

  Furthermore, in recent years, an information embedding technique using a special background pattern as described in Patent Document 3 has been developed. According to this technique, information cannot be extracted from the characters and design parts described in the printed matter. Therefore, in order to enable decoding of such special background pattern information, an error correction code technique is introduced.

JP 2002-218207 A JP 2005-327266 A JP 2007-005935 A

  However, in general, error correction codes have a limit in correction capability. If information loss or an error occurs beyond this limit, wrong information may be decoded. If there is an error in the information extracted in this way, the processing after the information extraction is greatly affected, and there is a problem that reliability and stability cannot be ensured.

  The present invention has been made in view of the above, and an information processing apparatus, a program, and an additional image that can ensure the stability and reliability of information processing after extraction of additional information added to the additional image An object is to provide a generation method and an information extraction method.

In order to solve the above-described problems and achieve the object, an information processing apparatus according to a first aspect of the present invention acquires image acquisition means for acquiring an image to be processed and additional information to be added to the image. Additional information acquisition means, error detection information generation means for generating error detection information used for determining success or failure of information decoding from the additional information, and header generation means for generating a header that is a codeword storing the error detection information Header encoding means for generating an encoded header by adding an error correction code used to correct the header error to the header, and correcting the error of the additional information with respect to the additional information An information encoding means for generating encoded information by adding an error correction code used for the purpose, and generating an additional image added to the image by integrating the encoded header and the encoded information. Comprising the additional image generating means for, the, the additional information is the greater bit length than the header, error correction code used to correct errors in the additional information is a valid code if the bit length is greater There is .

  According to a second aspect of the present invention, in the information processing apparatus according to the first aspect, the extracted image acquisition means for acquiring the additional image to be processed, the encoded header and the encoded information from the additional image. Information extracting means for extracting, header decoding means for correcting the error of the encoded header according to information of the error correction code of the encoded header specified in advance, and decoding the header, and error correction of the encoded information Calculated from information decoding means for correcting the error of the encoded information according to the information of the code and decoding the additional information, the error detection information stored in the decoded header and the decoded additional information Decoding determination means for comparing the error detection information with the error detection information and determining the success or failure of the information decoding.

  According to a third aspect of the present invention, in the information processing apparatus according to the first aspect, the additional image generation means distributes the encoded information and the information of the encoded header to add to the image.

  According to a fourth aspect of the present invention, in the information processing apparatus according to the third aspect, the additional image generation means determines that the bit string configuring the encoded header and the bit string configuring the encoded information are 1 according to a predetermined rule. One bit string.

  According to a fifth aspect of the present invention, in the information processing apparatus according to the second aspect, when the decoding determination unit determines that the decoding has failed, the information processing apparatus further includes a processing interruption unit that interrupts the processing.

  According to a sixth aspect of the present invention, in the information processing apparatus according to the fifth aspect, when the processing interruption means interrupts the processing, the information processing device notifies that the decoding has failed.

An information processing apparatus according to a seventh aspect of the present invention is a target to be added to an encoded header and an image obtained by performing error correction encoding on a header that is a code word storing error detection information used for determining whether or not information decoding is successful. Extracted image acquisition means for acquiring an additional image generated by integrating encoded information obtained by error correction encoding the additional information, information extraction means for extracting the encoded header and the encoded information from the additional image, Header decoding means for correcting the error of the encoded header according to information of the error correction code of the encoded header specified in advance and decoding the header; and encoding according to the information of the error correction code of the encoded information An information decoding means for correcting the error in the information and decoding the additional information, and calculating from the error detection information stored in the decoded header and the decoded additional information Is the by comparing the error detection information includes a decoding decision means for determining success or failure information decoding, and the additional information has a larger bit length than the header, is used to correct an error of the additional information The error correction code is an effective code when the bit length is large .

  The invention according to claim 8 further includes a processing interruption means for interrupting the processing in the information processing apparatus according to claim 7 when the decoding determination means determines that decoding has failed.

  According to a ninth aspect of the present invention, in the information processing apparatus according to the eighth aspect, when the processing is interrupted, the processing interrupting unit notifies that the decoding has failed.

The program of the invention according to claim 10, the computer, the image obtaining function for obtaining an image to be processed, the additional information acquisition function of acquiring the additional information of interest to be added to the image, from the additional information An error detection information generation function for generating error detection information used to determine whether or not information decoding is successful; a header generation function for generating a header which is a codeword storing the error detection information; and an error of the header relative to the header A header encoding function for generating an encoded header by adding an error correction code used to correct the error, and an error correction code used for correcting the error of the additional information to the additional information Information encoding function for generating encoding information, and an additional image generation function for generating an additional image added to the image by integrating the encoding header and the encoding information , Allowed to run, the additional information is the greater bit length than the header, error correction code of the additional information is valid code if the bit length is large.

The program according to an eleventh aspect of the present invention is a program for adding to a computer an encoded header obtained by error-correcting a header, which is a codeword storing error detection information used for determining whether or not information decoding is successful, and an image. An extraction image acquisition function for acquiring an additional image generated by integrating encoded information obtained by integrating error correction encoding of the additional information, and an information extraction function for extracting the encoding header and the encoding information from the additional image; A header decoding function for decoding the header by correcting an error in the encoded header according to the information of the error correction code of the encoded header specified in advance, and the code according to the information of the error correction code of the encoded information An information decoding function for correcting the error of the encoded information and decoding the additional information, and the error detection information stored in the decoded header and before the decoding An error detection information calculated from the additional information and the decoding decision function to determine the success or failure of information decoded by comparing, by the execution, the additional information has a larger bit length than the header, error correction of the additional information The code is an effective code when the bit length is large .

An additional image generation method according to a twelfth aspect of the present invention includes an image acquisition step of acquiring a processing target image, an additional information acquisition step of acquiring additional information to be added to the image, and the additional information. An error detection information generation step for generating error detection information used to determine whether the information decoding is successful, a header generation step for generating a header which is a codeword storing the error detection information, and an error of the header with respect to the header A header encoding step for generating an encoded header by adding an error correction code used to correct the error, and an error correction code used for correcting an error of the additional information to the additional information seen containing an information encoding step of generating of information, and the additional image generating step of generating an additional image to which the image integrated with the encoded information and the encoded header and The additional information has a larger bit length than the header, error correction code of the additional information is valid code if the bit length is large.

According to the thirteenth aspect of the present invention, there is provided an information extraction method to be added to an encoded header obtained by performing error correction encoding on a header that is a code word storing error detection information used to determine whether information decoding has succeeded or not, and an image. An extraction image acquisition step of acquiring an additional image generated by integrating the encoding information obtained by error correction encoding the additional information, an information extraction step of extracting the encoding header and the encoding information from the additional image, A header decoding step of correcting the error of the encoded header according to the information of the error correction code of the encoded header specified in advance and decoding the header; and the encoding according to the information of the error correction code of the encoded information An information decoding step of correcting the error of the information and decoding the additional information, the error detection information stored in the decoded header and the decoded additional information And error detection information and the decoding determination step of determining success or failure information decoded by comparing the issued, only contains the additional information increases the bit length than that of the header,
The error correction code of the additional information is a code that is effective when the bit length is large .

  According to the present invention, a header for storing error detection information used for determining success or failure of information decoding generated from additional information to be added to an image is prepared, and an encoded header obtained by error-correcting the header is provided. Since the superimposed information is generated by integrating the additional information encoded with the error correction code, it is calculated from the error detection information stored in the header and the decoded additional information at the time of information extraction. Therefore, it is possible to determine whether or not the information decoding is successful by comparing with the error detection information to be improved, and it is possible to improve the information extraction performance with respect to the embedding of the additional information in the image.

  According to the present invention, the header of the encoded header is corrected by correcting the error of the encoded header according to the information of the error correcting code of the encoded header specified in advance, and encoded according to the information of the error correcting code of the encoded information. By correcting the error in the information and decoding the additional information, the error detection information stored in the header is used to determine the success or failure of the information decoding. Therefore, the stability and reliability of information processing after extraction of additional information embedded in the superimposed image can be ensured.

  Exemplary embodiments of an information processing apparatus, a program, an additional image generation method, and an information extraction method according to the present invention are explained in detail below with reference to the accompanying drawings.

  An embodiment of the present invention will be described with reference to FIGS. This embodiment is an example in which a personal computer is applied as an information processing apparatus.

  FIG. 1 is a schematic diagram showing a construction example of a printing system according to an embodiment of the present invention. The printing system according to the present embodiment assumes a system in which a printer 3 and a scanner 4 are connected to a computer 1 via a network 2 such as a LAN (Local Area Network). The document data is transmitted to the printer 3 via the network 2, and the transmitted digital document data is output as a hard copy from the printer 3. The digital document data read through the scanner 4 is transmitted to the computer 1 through the network 2.

  Next, the computer 1 will be described. The computer 1 is a general or standard personal computer. FIG. 2 is a hardware configuration diagram of the computer 1. The computer 1 includes a CPU (Central Processing Unit) 12 that performs information processing, a ROM (Read Only Memory) 13 that stores a BIOS (Basic Input Output System), and a RAM (Random) that temporarily stores information during processing. A primary storage device such as an Access Memory (14), a secondary storage device such as an HDD (Hard Disk Drive) 15 that is a storage unit for storing application programs and processing results, and information is stored or distributed externally or information ( For connecting to a drive 17 of a removable medium 16 which is a storage medium for obtaining an application program from the outside and a network 2 for communicating with other external devices (computer 1, printer 3, scanner 4). The network interface 18 and the display 1 which is a display unit for displaying the processing progress, processing results, etc. When the operator is composed of an input unit such as a keyboard 20 and a mouse 21 for inputting instructions and information to the computer 1, the data communication between the bus controller 22 is operating in the arbitration.

  The removable medium 16 includes a magnetic storage medium such as a flexible disk, hard disk, and magnetic tape, a magneto-optical storage medium such as MO, CD, CD-ROM, CD-R, CD-RW, Various storage media such as optical storage media such as DVD-ROM, DVD-R, DVD-RAM, DVD-RW, DVD + RW, and semiconductor memory can be applied.

  In the data transmission, the network interface 18 outputs a signal to the network 2 by sending data to the network interface 18 of the computer 1. The network interface 18 determines whether the signal received by the network interface 18 is necessary, and performs processing such as fetching if necessary data and discarding if unnecessary. In other words, all data transmission / reception is performed via the network interface 18.

  In general, when the user turns on the power of the computer 1, the CPU 12 activates a program called a loader included in the BIOS in the ROM 13, and the hardware and software of the computer 1 called the operating system (OS) from the HDD 15. Is loaded into the RAM 14. When the OS is activated, it supports activation of application programs, reading of information, storage, and the like according to user operations. Windows (registered trademark) or the like is known as a typical OS. Programs that run on these OSs are called application programs. The application program is not limited to one that runs on a predetermined OS, and may be one that causes the OS to execute some of the various processes described below, or constitutes predetermined application software, an OS, or the like. It may be included as part of a group of program files.

  In general, an application program installed in the HDD 15 of the computer 1 is recorded in the removable medium 16, and the application program recorded in the removable medium 16 is installed in the HDD 15. For this reason, the removable medium 16 can also be a storage medium for storing application programs. Furthermore, the application program may be taken in from the outside via, for example, the network interface 18 and installed in the HDD 15.

  When an application program that runs on the OS is activated, the computer 1 performs various arithmetic processes according to the application program, and controls each unit intensively.

  Next, characteristic processing of the present embodiment among various types of arithmetic processing executed by the CPU 12 of the computer 1 will be described below. Schematically, the characteristic processing of this embodiment is that information is added to an image stored in the HDD 15 of the computer 1 and is output to paper by the printer 3. Here, the information to be added may be any information, but for example, information on the storage location of the original image data, information on the printing date and time, and the printer ID may be added. In the present embodiment, information represented by two types of image patterns as shown in FIG. 3 (representing bit 0 with “..., And bit 1 with“: ”) is superimposed and superimposed on the image. Although an example of an image (additional image) will be described as an example, information represented by an image pattern may be directly embedded in the image. In addition, a two-dimensional barcode or the like may be superimposed on the image instead of the image pattern, or the two-dimensional barcode or the like may be directly embedded in the image.

  The computer 1 stores an information addition program and an information extraction program in the HDD 15 as application programs. That is, when an information addition program and an information extraction program operating on the OS are started, the computer 1 executes information addition processing and information extraction processing by controlling each unit according to the information addition program and information extraction program. .

  First, information addition processing and information extraction processing will be described. FIG. 4 is a block diagram illustrating a functional configuration related to the information addition process and the information extraction process of the computer 1. As illustrated in FIG. 4, the computer 1 includes an image acquisition unit 31 that functions as an image acquisition unit and an additional information acquisition unit 32 that functions as an additional information acquisition unit by the CPU 12 following an information addition program that operates on the OS. An error detection information generation unit 33 that functions as an error detection information generation unit, a header generation unit 34 that functions as a header generation unit, a header encoding unit 35 that functions as a header encoding unit, and an information encoding unit An information encoding unit 36, a superimposed image generation unit 37 that functions as an additional image generation unit, and a print processing unit 38 are realized. On the other hand, when the CPU 12 follows an information extraction program that runs on the OS, the computer 12 extracts an extracted image acquisition unit 41 that functions as an extracted image acquisition unit, an information extraction unit 42 that functions as an information extraction unit, and a header decoding unit. A header decoding unit 43 that functions, an information decoding unit 44 that functions as an information decoding unit, a decoding determination unit 45 that functions as a decoding determination unit, and a processing interruption unit 46 that functions as a processing interruption unit are realized.

  First, an information addition process for adding additional information to an image will be described with reference to the flowchart of FIG. As shown in FIG. 5, in step S <b> 1, the image acquisition unit 31 acquires an image to be processed. In the present embodiment, the case where an image is stored in the HDD 15 of the computer 1 will be described. However, the present invention is not limited to this, and an image stored in a removable medium 16 such as a CD can be acquired or the network 2 can be acquired. An image may be acquired from another computer above.

  Next, in step S2, the additional information acquisition unit 32 acquires additional information to be added to the image. As a specific acquisition method, it is conceivable to acquire information such as the storage location of the original image data and the printer ID from the computer 1. In addition, it is conceivable that the information on the printing date and time is obtained from the computer 1 in the same manner, or obtained from a TSA (time certification authority) or the like via the network 2.

  In subsequent step S3, the error detection information generation unit 33 generates error detection information used for determining success or failure of information decoding described later from the additional information. As error detection information, parity codes, checksums, MD5 based on a hash function, SHA-1, and the like can be considered.

  In subsequent step S4, the header generation unit 34 generates a header (bit string) that is a code word storing the error detection information generated in step S3. FIG. 6 shows an example of the generated header. In the present embodiment, the header stores not only the error detection information but also information related to the size of the additional information and the type of encoding when the additional information is error correction encoded.

  In subsequent step S5, the header encoding unit 35 performs error correction encoding by adding inspection information (error correction code) used for correcting the header error to the header generated in step S4, and performs encoding. Generate a header. FIG. 7 shows an example of the generated encoded header. Note that it is conceivable to use a BCH code, a Reed-Solomon code, a turbo code, or the like as the error correction code.

  In subsequent step S6, the information encoding unit 36 adds error correction check information (error correction code) to the additional information, performs error correction encoding, and generates encoded information. FIG. 8 shows an example of the generated encoded information. In general, since the additional information has a bit length larger than that of the header, an error correction code to be used may be not only a BCH code or a turbo code but also an LDPC code that is advantageous when the bit length is large. Further, as shown in FIG. 9, the additional information may be divided into a certain size, and error correction coding may be performed for each divided additional information.

  In subsequent step S7, the superimposed image generation unit 37 generates a superimposed image by integrating the encoded header generated in step S5 and the encoded information generated in step S6, and generates the superimposed image in the image acquired in step S1. Append.

  By the way, when the encoded header and the encoded information are integrated, it is important that the header information can be accurately extracted even when a burst error occurs. It is necessary to disperse the header information and add it to the image. One method is shown in FIG. According to the crossing method shown in FIG. 10, the encoded header is divided into M bits (for example, M = 1), and L encoded information is divided into N bits (N = L × M). Then, M bits are sequentially inserted and rearranged from the L pieces of encoded information with respect to the encoded header M bits, thereby generating one integrated bit string.

  In subsequent step S8, the print processing unit 38 outputs the superimposed image generated in step S7 to paper, thereby obtaining a printed matter in which information is embedded. In the example shown in FIG. 11, a superimposed image in which an encoding header and encoding information are embedded in an image is drawn by drawing two types of patterns, a pattern 0 indicating bit 0 and a pattern 1 indicating bit 1 in a grid pattern. It is printed.

  Next, information extraction processing for extracting additional information from a superimposed image will be described with reference to the flowchart of FIG. As illustrated in FIG. 12, in step S11, the extracted image acquisition unit 41 acquires a superimposed image that is a processing target. In the present embodiment, the printed material on which the superimposed image is printed is read by the scanner 4, and the image data of the read superimposed image is acquired via the network 2. The acquisition of the superimposed image is not limited to this, and an image that has already been read as an image and stored in the HDD 15 of the computer 1 or an image stored in the removable medium 16 such as a CD is acquired. Alternatively, an image may be acquired from another computer on the network 2.

  In subsequent step S12, the information extraction unit 42 identifies a pattern on the superimposed image and extracts a bit string in which the encoded header and the encoded information are integrated. Then, the encoded header and the encoded information are separated from the bit string. As a method for separating the encoded header and the encoded information from the bit string, the crossing method shown in FIG. 10 may be executed in reverse.

  In subsequent step S13, the header decoding unit 43 corrects the error of the encoded header extracted in step S12 in accordance with the information of the encoded header check information (error correction code), and decodes the header. It is assumed that information related to the type of inspection information (error correction code) of the encoded header is designated in advance in the computer 1.

  In subsequent step S14, the information decoding unit 44 corrects the error of the encoded information extracted in step S12 according to the information of the check information (error correction code) of the encoded information, and decodes the additional information. The information related to the type of the check information (error correction code) of the encoded information may be specified in advance in the computer 1, or the information related to the type of the error correction code stored in the header is used. It may be.

  In subsequent step S15, the decoding determination unit 45 compares the error detection information stored in the decoded header with the error detection information calculated from the decoded additional information, and determines the success or failure of the information decoding. Specifically, error detection information (such as a checksum) is calculated from the additional information decoded in step S14, and it is determined whether or not this matches the error detection information stored in the header. If they match, it is determined that the decoding is successful, and if they do not match, it is determined that the decoding fails.

  If it is determined that decoding is successful (Yes in step S16), various information processing using additional information is continued. As an example of information processing, when the storage location of the original image data is stored as additional information, processing such as accessing the storage location and opening the image file with application software is executed (step S17). ).

  On the other hand, if it is determined that decoding has failed (No in step S16), the process proceeds to step S18.

  In step S18, the processing interruption unit 46 interrupts the subsequent processing and notifies that the decoding has failed. For example, a message indicating that decryption has failed is displayed on the display 19.

  In this embodiment, when it is determined that decoding has failed (No in step S16), the subsequent processing is interrupted and a message indicating that decoding has failed is displayed on the display 19. (Step S18), the present invention is not limited to this, and various types of information processing using the additional information that has partially failed in decoding may be continued.

  Here, an example of information extraction will be described. FIG. 13 is an explanatory diagram illustrating an example of extracting a bit string from a superimposed image. FIG. 13 shows an example of bit string extraction from a superimposed image in which bit information cannot be extracted due to additional writing or dirt on a printed matter on which the superimposed image is printed. As shown in FIG. 13, in a bit string extracted from a superimposed image in which there is a portion where bit information cannot be extracted due to additional writing or dirt, a bit whose pattern recognition has failed or a bit whose information cannot be extracted appears. FIG. 14 is a decoding example of the encoded header and the encoded information from the bit string of the superimposed image shown in FIG. As shown in FIG. 14, according to the present embodiment, the encoded header error is corrected according to the information of the encoded header inspection information (error correction code) specified in advance, and the header is decoded. In addition to decoding the additional information by correcting the error of the encoded information according to the information of the check information (error correction code) of the encoded information, the error detection information (checksum etc.) stored in the header is used to decode the information. By determining success or failure, the additional information embedded in the image can be extracted accurately, so that the stability and reliability of information processing after extraction can be ensured.

  As described above, according to the present embodiment, a header for storing error detection information used for determining success or failure of information decoding generated from additional information to be added to an image is prepared, and the header is subjected to error correction coding. The encoded header and the encoded information obtained by error-correcting the additional information are integrated to generate a superimposed image, so that the error detection information stored in the header is decoded at the time of information extraction. Since it is possible to determine the success or failure of information decoding by comparing with error detection information calculated from the additional information, it is possible to improve the information extraction performance with respect to embedding the additional information in the image.

  Further, according to the present embodiment, since the encoded information and the bit string constituting the encoded header are dispersed and added to the image, the header can be decoded even if a burst error occurs.

  Furthermore, according to the present embodiment, the encoded header error is corrected in accordance with the information of the encoded header inspection information (error correction code) designated in advance, and the header is decoded. The error of the encoded information is corrected in accordance with the information of (error correction code) and the additional information is decoded, and the success or failure of the information decoding is determined using the error detection information (checksum or the like) stored in the header. As a result, the additional information embedded in the image can be accurately extracted, so that the stability and reliability of the information processing after the extraction of the additional information embedded in the superimposed image can be ensured. .

  In this embodiment, the information addition process and the information extraction process are performed by one computer 1, but the present invention is not limited to this, and the information addition process and the information extraction process are performed by different computers. You may make it process.

  In this embodiment, an example in which a personal computer is applied as the information processing apparatus has been described. . Furthermore, it goes without saying that the present invention can also be applied to a control unit of a copier equipped with a printer and a scanner and a control unit of an MFP (Multi Function Peripheral).

It is a schematic diagram which shows the construction example of the printing system concerning one Embodiment of this invention. It is a block diagram of the hardware of a computer. It is explanatory drawing which shows the outline of a process of a computer. It is a block diagram which shows the function structure concerning an information addition process and an information extraction process. It is a flowchart which shows the flow of an information addition process. It is a schematic diagram which shows an example of a header. It is a schematic diagram which shows an example of an encoding header. It is a schematic diagram which shows an example of encoding information. It is a schematic diagram which shows another example of encoding information. It is explanatory drawing which shows the production | generation procedure of the bit sequence by a crossing method. It is explanatory drawing which shows the example of printing of a superimposed image. It is a flowchart which shows the flow of an information extraction process. It is explanatory drawing which shows the example of extraction of the bit sequence from a superimposition image. It is explanatory drawing which shows the decoding example of the encoding header and encoding information from the bit sequence of the superimposed image shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information processing apparatus 31 Image acquisition means 32 Additional information acquisition means 33 Error detection information generation means 34 Header generation means 35 Header encoding means 36 Information encoding means 37 Additional image generation means 41 Extracted image acquisition means 42 Information extraction means 43 Header decoding Means 44 Information decoding means 45 Decoding determination means 46 Processing interruption means

Claims (13)

Image acquisition means for acquiring an image to be processed;
Additional information acquisition means for acquiring additional information to be added to the image;
Error detection information generating means for generating error detection information used for determining success or failure of information decoding from the additional information;
Header generating means for generating a header which is a codeword storing the error detection information;
Header encoding means for generating an encoded header by adding an error correction code used for correcting an error of the header to the header;
Information encoding means for generating encoded information by adding an error correction code used for correcting an error of the additional information to the additional information;
An additional image generating means for generating an additional image added to the image by integrating the encoded header and the encoded information;
Equipped with a,
The additional information has a bit length larger than that of the header,
The error correction code used for correcting the error of the additional information is a code effective when the bit length is large.
An information processing apparatus characterized by that. Extracted image acquisition means for acquiring the additional image to be processed;
Information extraction means for extracting the encoded header and the encoded information from the additional image;
Header decoding means for correcting the error of the encoded header according to information of an error correction code of the encoded header specified in advance and decoding the header;
Information decoding means for correcting the error of the encoded information according to the information of the error correction code of the encoded information and decoding the additional information;
Decoding determination means for comparing the error detection information stored in the decoded header and the error detection information calculated from the decoded additional information to determine success or failure of information decoding;
The information processing apparatus according to claim 1, further comprising: The additional image generation means distributes the encoded information and the encoded header information and adds the information to the image.
The information processing apparatus according to claim 1. The additional image generating means makes a bit string constituting the encoded header and a bit string constituting the encoded information into one bit string according to a predetermined rule.
The information processing apparatus according to claim 3. If it is determined by the decoding determination means that the decoding has failed, it further comprises a process interruption means for interrupting the process,
The information processing apparatus according to claim 2. The process interruption means informs that decoding has failed when the process is interrupted.
The information processing apparatus according to claim 5. An encoded header obtained by error correcting encoding a header that is a code word storing error detection information used for determining whether or not information decoding is successful and an encoded information obtained by error correcting encoding additional information to be added to an image are integrated. Extraction image acquisition means for acquiring an additional image generated by converting,
Information extraction means for extracting the encoded header and the encoded information from the additional image;
Header decoding means for correcting the error of the encoded header according to information of an error correction code of the encoded header specified in advance and decoding the header;
Information decoding means for correcting the error of the encoded information according to the information of the error correction code of the encoded information and decoding the additional information;
Decoding determination means for comparing the error detection information stored in the decoded header and the error detection information calculated from the decoded additional information to determine success or failure of information decoding;
Equipped with a,
The additional information has a bit length larger than that of the header,
The error correction code of the additional information is a code that is effective when the bit length is large.
An information processing apparatus characterized by that. If it is determined by the decoding determination means that the decoding has failed, it further comprises a process interruption means for interrupting the process,
The information processing apparatus according to claim 7. The process interruption means informs that decoding has failed when the process is interrupted.
The information processing apparatus according to claim 8. On the computer,
An image acquisition function for acquiring an image to be processed;
An additional information acquisition function for acquiring additional information to be added to the image;
An error detection information generation function for generating error detection information used to determine whether information decoding is successful or not from the additional information;
A header generation function for generating a header which is a codeword storing the error detection information;
A header encoding function for generating an encoded header by adding an error correction code used for correcting an error of the header to the header;
An information encoding function for generating encoded information by adding an error correction code used for correcting an error of the additional information to the additional information;
An additional image generation function for generating an additional image added to the image by integrating the encoded header and the encoded information;
And execute
The additional information has a bit length larger than that of the header,
The error correction code of the additional information is a code that is effective when the bit length is large.
A program characterized by that. On the computer,
An encoded header obtained by error correcting encoding a header that is a code word storing error detection information used for determining whether or not information decoding is successful and an encoded information obtained by error correcting encoding additional information to be added to an image are integrated. Extracted image acquisition function to acquire additional images generated by
An information extraction function for extracting the encoded header and the encoded information from the additional image;
A header decoding function for correcting an error of the encoded header according to information of an error correction code of the encoded header specified in advance, and decoding the header;
An information decoding function for correcting the error of the encoded information according to the information of the error correction code of the encoded information and decoding the additional information;
A decoding determination function for determining success or failure of information decoding by comparing the error detection information stored in the decoded header and error detection information calculated from the decoded additional information;
And execute
The additional information has a bit length larger than that of the header,
The error correction code of the additional information is a code that is effective when the bit length is large.
A program characterized by that. An image acquisition step of acquiring an image to be processed;
An additional information acquisition step of acquiring additional information to be added to the image;
An error detection information generating step for generating error detection information used for determining success or failure of information decoding from the additional information;
A header generation step of generating a header which is a codeword storing the error detection information;
A header encoding step of generating an encoded header by adding an error correction code used for correcting an error of the header to the header; and
An information encoding step of generating encoded information by adding an error correction code used for correcting an error of the additional information to the additional information;
An additional image generating step of generating an additional image added to the image by integrating the encoded header and the encoded information;
Only including,
The additional information has a bit length larger than that of the header,
The error correction code of the additional information is a code that is effective when the bit length is large.
An additional image generation method characterized by the above. An encoded header obtained by error correcting encoding a header that is a code word storing error detection information used for determining whether or not information decoding is successful and an encoded information obtained by error correcting encoding additional information to be added to an image are integrated. An extraction image acquisition step of acquiring an additional image generated by converting to
An information extraction step of extracting the encoded header and the encoded information from the additional image;
A header decoding step of correcting an error of the encoded header according to information of an error correction code of the encoded header specified in advance and decoding the header;
An information decoding step of correcting the error of the encoded information according to the information of the error correction code of the encoded information and decoding the additional information;
A decoding determination step of determining success or failure of information decoding by comparing the error detection information stored in the decoded header and error detection information calculated from the decoded additional information;
Only including,
The additional information has a bit length larger than that of the header,
The error correction code of the additional information is a code that is effective when the bit length is large.
An information extraction method characterized by that.

Images