JP4622558B2 - Encoding apparatus and method, program, recording medium, and data processing system - Google Patents

Description

The present invention relates to an encoding apparatus and method, a program , a recording medium, and a data processing system, and more particularly to an encoding apparatus and method, program , and recording that can reliably prevent duplication with a low-cost and simple configuration. The present invention relates to a medium and a data processing system.

  Conventionally, for example, a video of content recorded on a recording medium such as a DVD (Digital Versatile Disk) is reproduced as shown in FIG. That is, the encoded data recorded on the recording medium is read by the playback device 1, and the data read by the decoding processing unit 21 of the playback device 1 is decoded and decoded. The converted data is converted into an analog signal by the D / A converter 22 and output to the display of the display device 2, whereby a video (image) is displayed on the display.

  However, if the analog signal output from the playback apparatus 1 is input to the copy manufacturing apparatus 3, there is a possibility that a copy of the content data is easily manufactured without permission. That is, an analog signal input to the replica manufacturing apparatus 3 is converted into digital data by the A / D conversion unit 31, and the converted data is encoded by the encoding processing unit 32 to be recorded in the recording unit 33. By recording on the recording medium to be mounted, a DVD copy reproduced by the reproducing apparatus 1 can be manufactured.

  For this reason, it has been proposed that the reproduction apparatus 1 and the display apparatus 2 perform a scramble or descrambling process in order to prevent a duplicate from being manufactured without permission. That is, as shown in FIG. 2, the encoded data that is recorded on the recording medium by the playback device 1 is read, and the data read by the decoding processing unit 21 of the playback device 1 ( After the decoding is performed, the scramble processing unit 23 scrambles (encrypts) the data. The scrambled data is converted into an analog signal by the D / A converter 22 and output to the display device 2.

  On the other hand, in the display device 2, the analog signal supplied from the playback device 1 is converted into digital data by the A / D conversion unit 41 of the display device 2, and the descramble processing unit 42 descrambles the scrambled data. (Decrypt the encrypted data) and output to the D / A converter 43. The D / A converter 43 converts the descrambled data into an analog signal again and outputs the analog signal to the display 44, thereby displaying an image (image) on the display 44.

  Also, good quality was maintained without degrading the quality of the pre-copy image by performing encoding focusing on noise such as phase shift of the digital image signal obtained by A / D conversion of the analog image signal. There has also been proposed a technique that makes copying impossible as it is, thereby preventing unauthorized copying using an analog image signal (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-289685

  However, the conventional technology as shown in FIG. 2 has a problem that the configuration of the playback device 1 and the display device 2 becomes complicated due to the scramble or descrambling process, resulting in an increase in size of the device and an increase in cost. It was.

  Further, when the scramble algorithm is decoded, there is a possibility that a replica is easily manufactured by incorporating a descramble processing unit in the replica manufacturing apparatus.

  Furthermore, in recent years when the distribution of digital contents has become common, proposals for methods other than conventional techniques have been requested.

  The present invention has been made in view of such circumstances, and is intended to reliably prevent the production of a replica with a low cost and simple configuration.

  An encoding apparatus according to the present invention is an encoding apparatus that encodes input digital data, and changes the phase of the input digital data and outputs the digital data output from the phase change means. Block extraction means for extracting blocks from the data by a preset method, encoding means for encoding the blocks extracted by the block extraction means, and blocks encoded by the encoding means by the phase change means And an output means for outputting in association with information on the changed phase.

  And further comprising an encoding method selecting means for selecting an encoding method for the block extracted by the block extracting means, wherein the encoding means selects the block extracted by the block extracting means from the code selected by the encoding method selecting means. The output means may further output the block encoded by the encoding means in association with information representing the encoding method selected by the encoding method selection means. it can.

  The encoding method selecting means can select one encoding method corresponding to each block extracted by the block extracting means from a plurality of preset encoding methods. .

  The encoding method selection means further selects one quantization method corresponding to each block extracted by the block extraction means from a plurality of preset quantization methods, and the encoding means Furthermore, the block can be quantized based on the quantization method selected by the encoding method selection means.

  The image processing apparatus may further include a conversion unit that converts an input signal into digital data, and the phase changing unit may change the phase of the digital data converted by the conversion unit and output the digital data.

  The digital data converted by the conversion means may be added with distortion accompanying conversion.

An encoding method of the present invention is an encoding method of an encoding device that encodes input digital data, wherein the phase change means changes the phase of the input digital data and outputs the phase change step. The block extraction unit extracts a block from the digital data output by the phase changing step by a preset method, and the encoding unit extracts the block extracted by the block extraction step. An encoding step for encoding, and an output means for outputting the block encoded by the processing of the encoding step in association with the information relating to the phase changed by the processing of the phase changing step. It is characterized by.

A first program of the present invention is an encoding device that encodes input digital data to a computer, the phase changing means for changing the phase of the input digital data, and the phase changing means Block extraction means for extracting a block from digital data output from the block by a preset method, encoding means for encoding the block extracted by the block extraction means, and encoding by the encoding means The block is made to function as an encoding device including an output unit that outputs the block in association with information related to the phase changed by the phase changing unit .

A first recording medium of the present invention is an encoding device that encodes input digital data to a computer, and changes the phase of the input digital data and outputs the phase change means, and the phase change A block extracting means for extracting a block from the digital data output from the means by a preset method; an encoding means for encoding the block extracted by the block extracting means; and the encoding means for encoding. A program is recorded that causes the block to function as an encoding device that includes an output unit that outputs the block in association with information related to the phase changed by the phase changing unit .

  In the encoding apparatus and method and the first program of the present invention, the phase of the input digital data is changed and output, and the block is extracted from the output digital data by a preset method. The extracted block is encoded, and the encoded block is output in association with information on the changed phase.

  The data processing system of the present invention includes an encoding unit that encodes input data, and a decoding unit that decodes data encoded by the encoding unit, and image data encoded by the encoding unit. In the data processing system in which the image data obtained as a result of decoding by the decoding unit is further encoded by encoding and the image quality corresponding to the image data deteriorates when decoded by the decoding unit, the encoding unit is input Phase changing means for changing and outputting the phase of the digital data, block extracting means for extracting a block from the digital data outputted from the phase changing means by a preset method, and a block extracted by the block extracting means The encoding means for encoding the block and the block encoded by the encoding means in association with information relating to the phase changed by the phase changing means And an outputting means for force.

  In the data processing system of the present invention, the phase of the digital data input by the encoding unit is changed and output, and the block is extracted from the output digital data by a preset method. Are encoded, and the encoded block is output in association with information on the changed phase.

  According to the present invention, it is possible to prevent manufacture of a replica. In particular, it is possible to reliably prevent the production of replicas with a low cost and simple configuration.

  Embodiments of the present invention will be described below. The correspondence relationship between the invention described in this specification and the embodiments of the invention is exemplified as follows. This description is intended to confirm that the embodiments supporting the invention described in this specification are described in the specification. Therefore, even if there is an embodiment which is described in the specification but is not described here, this means that the embodiment does not correspond to the invention. It is not a thing. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean that all the inventions described in the specification are claimed. In other words, this description is for the invention described in the specification and not claimed in this application, i.e., for the invention that will be filed in division or applied or added in the future. It does not deny existence.

  The encoding apparatus according to claim 1 is an encoding apparatus that encodes input digital data (for example, the encoding apparatus of the recording apparatus 100 in FIG. 3), and changes the phase of the input digital data. Phase changing means (for example, the phase adjusting unit 131 in FIG. 3) to be output and block extracting means (for example, FIG. 3) for extracting a block from the digital data output from the phase changing means by a preset method. Block extracting unit 132), an encoding unit for encoding the block extracted by the block extracting unit (for example, the encoding quantizing unit 134 in FIG. 3), and a block encoded by the encoding unit Output means (for example, the output data generation unit 135 in FIG. 3) that outputs the information in association with the information on the phase changed by the phase change means.

  The encoding apparatus according to claim 2 further includes an encoding method selection unit (for example, an encoding quantization selection unit 133 in FIG. 3) that selects an encoding method of the block extracted by the block extraction unit. The encoding means encodes the block extracted by the block extraction means by the encoding method selected by the encoding method selection means, and the output means encodes the block encoded by the encoding means. Can be output in association with information representing the encoding method selected by the encoding method selection means.

  The encoding device according to claim 5 further includes conversion means (for example, an A / D conversion unit 121 in FIG. 3) for converting an input signal into digital data, and the phase changing means is controlled by the conversion means. The phase of the converted digital data can be changed and output.

The encoding method according to claim 7 is an encoding method of an encoding device (for example, the encoding device of the recording device 100 in FIG. 3) that encodes input digital data, and the phase changing unit includes: A phase changing step (for example, the process of step S21 in FIG. 6) for changing the phase of the input digital data and outputting the block, and the block extracting means are set in advance from the digital data output by the process of the phase changing step. A block extraction step (for example, the process of step S22 in FIG. 6) for extracting a block by the generated method, and an encoding step (for example, for encoding the block extracted by the process of the block extraction step). and step S24) in FIG. 6, the output means, a coded block by the processing of the coding step, the process of the phase change step And an output step of outputting in association with information about more changes are allowed is phase (for example, step S26 in FIG. 6).

The data processing system according to claim 10 , further comprising: an encoding unit that encodes input data; and a decoding unit that decodes data encoded by the encoding unit; A data processing system in which the image data obtained as a result of decoding the encoded image data by the decoding unit is further encoded by the encoding, and the image quality corresponding to the image data deteriorates when the decoding unit decodes the image data In the encoding unit, the phase change unit (for example, the phase adjustment unit 131 in FIG. 3) that changes and outputs the phase of the input digital data and the digital data output from the phase change unit in advance A block extracting unit (for example, the block extracting unit 132 in FIG. 3) that extracts a block by a set method and the block extracted by the block extracting unit are encoded. And an output that outputs the block encoded by the encoding unit in association with the information about the phase changed by the phase changing unit. Means (for example, the output data generation unit 135 of FIG. 3).

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing a configuration of an embodiment of the recording apparatus 100 to which the present invention is applied. The recording device 100 is configured as a DVD recorder, for example.

  In the figure, an A / D converter 121 converts an analog signal, for example, a video (image) signal input to the recording apparatus 100 into digital data, and outputs the digital data to the encoding processor 122.

  The encoding processing unit 122 encodes the data supplied from the A / D conversion unit 121 by a preset encoding method as defined by MPEG (Moving Picture Experts Group), for example. Encode data, which is data encoded by the above, is generated. In addition, the encoding processing unit 122 generates control information necessary for reproducing the encoded data, and outputs the control information to the data recording unit 123 together with the encoded data.

  The data recording unit 123 records the encoded data and control information output from the encoding processing unit 122 on a recording medium such as a DVD (Digital Versatile Disk).

  The data recording unit 123 may be provided separately from the apparatus main body, and the generation and recording of the encoded data and control information described above may be performed separately. That is, the recording apparatus 100 may be configured by the data recording unit 123 and the encoding device including the A / D conversion unit 121 and the encoding processing unit 122 described above.

  The encoding processing unit 122 is provided with a phase adjustment unit 131, and the phase adjustment unit 131 changes the phase of data supplied from the A / D conversion unit 121. Thereby, the position of the block extracted by the block extraction part 132 changes each time.

  The block extraction unit 132 of the encoding processing unit 122 is a block configured by a preset number of pixels (for example, 8 × 8 pixels) in the data (image data) supplied via the phase adjustment unit 131. To extract.

  The coding quantization selection unit 133 of the coding processing unit 122 selects a pattern of coding quantization processing performed by the coding quantization unit 134 on the block extracted by the block extraction unit 132. The encoding quantization unit 134 performs encoding quantization processing of a plurality of patterns.

  FIG. 4 is a diagram illustrating an example of a plurality of patterns of the coding quantization process performed by the coding quantization unit 134. In the figure, a pattern A1 is a process of DCT transform (discrete cosine transform) of data (block data extracted by the block extractor 132) and further quantizing based on a preset quantization table 1. Represents. A pattern A2 or A3 represents a process of DCT-converting data and further quantizing based on a preset quantization table 2 or quantization table 3.

  Further, the pattern B1 is a process of performing ADRC (Adaptive Dynamic Range Coding) processing on data (block data extracted by the block extraction unit 132), and further quantizing based on the preset allocation bit a. Represents. A pattern B2 or B3 represents a process of performing ADRC processing on the data and further quantizing the data based on a preset allocation bit b or allocation bit c.

  The pattern C1 is subjected to VQ (Vector Quantization) processing on the data (block data extracted by the block extraction unit 132), and further quantized based on a preset codebook a. Represents the processing to be performed. A pattern C2 or C3 represents a process of performing VQ processing on data and further performing quantization based on a preset codebook b or codebook c.

  For example, the encoding quantization selection unit 133 selects one pattern from the plurality of patterns illustrated in FIG. 4, and sends information representing the selected pattern to the encoding quantization unit 134 and the output data generation unit 135. Supply.

  The encoding quantization unit 134 performs encoding quantization processing corresponding to the pattern selected by the encoding quantization selection unit 133 on the block data extracted by the block extraction unit 132, thereby encoding data. Is output to the output data generation unit 135.

  The output data generation unit 135 of the encoding processing unit 122 sends the encoded data generated by the encoding quantization unit 134 to the data recording unit 123 together with control information for specifying the pattern selected by the encoding quantization selection unit 133. Output.

  Next, the data recording process performed by the recording apparatus 100 will be described with reference to the flowchart of FIG.

  In step S1, the A / D converter 121 converts the input analog signal into digital data. At this time, the input analog signal is added with, for example, signal distortion that naturally occurs when D / A conversion is performed (including white noise that occurs naturally). The processed digital data becomes digital data corresponding to a signal including this distortion.

  In step S2, the encoding processing unit 122 executes an encoding process which will be described later with reference to FIG. Thereby, as described above, the encoded data of the data output from the A / D conversion unit 121 and the control information are output.

  In step S3, the data recording unit 123 records the encoded data output in the process of step S2 and the control information on a recording medium such as a DVD.

  In step S4, for example, the recording apparatus 100 determines whether or not the end of the process is instructed by a user operation or the like. If it is determined that the end is not instructed yet, the process returns to step S1. The subsequent processing is repeatedly executed. If it is determined in step S4 that termination has been commanded, the process ends.

  In this way, data (for example, image data) is recorded. Data recorded by the recording apparatus 100 by this processing is used as, for example, original data (data that is not a copy (copy)) for selling a DVD on which the data is recorded as a product.

  Next, the details of the encoding process in step S2 of FIG. 5 will be described with reference to the flowchart of FIG.

  In step S <b> 21, the phase adjustment unit 131 changes the phase of the data supplied from the A / D conversion unit 121. Thereby, the position of the block extracted by the block extraction part 132 changes.

  In step S <b> 22, the block extraction unit 132 extracts a block composed of a preset number of pixels in the data (image data) supplied via the phase adjustment unit 131.

  Thereby, for example, blocks are extracted as shown in FIG. In FIG. 7, the line 151 that is the first line of the image data is divided into six blocks 151 a to 151 f extracted by the block extraction unit 132. Similarly, the second line 152 and the third line 153 of the image data are the six blocks 152a to 152f extracted by the block extraction unit 132 and the blocks 153a to 153a, respectively. It is divided into 6 blocks 153f.

  Here, the start position and end position of the block in the horizontal direction in the drawing are different between the line 151 and the line 152. Similarly, the line 152 and the line 153 have different horizontal block start positions and end positions. This is because the position of the block extracted by the block extraction unit 132 is changed by the phase adjustment unit 131 changing the phase of the data supplied from the A / D conversion unit 121 in step S21. . In this example, the phase adjustment unit 131 changes the data phase in units of one line.

  By doing so, it is possible to extract a block different from the block extraction by the conventional recording apparatus. For example, since the conventional recording apparatus is not provided with a functional block corresponding to the phase adjustment unit 131, the block is extracted as indicated by a dotted line 161 in FIG. That is, in the conventional recording apparatus, the start position and the end position of the block are equal in each of the first to third lines.

  Information indicating the phase change of each block at this time is supplied to the output data generation unit 135.

  Returning to FIG. 6, in step S <b> 23, the encoding / quantization selecting unit 133 selects a pattern of the quantization encoding process. Here, for example, for one block extracted by the process of step S22, one pattern is selected from the plurality of process patterns shown in FIG. 4 described above (individually for each block). Pattern is selected). For example, the pattern may be selected from a plurality of patterns according to a preset order, or the data of the pixels constituting the block extracted in the process of step S22 may be analyzed and analyzed. You may make it select based on a result. As described above, information representing the selected pattern is supplied to the encoding / quantization unit 134 and the output data generation unit 135.

  In step S <b> 24, the coding quantization unit 134 performs coding quantization processing corresponding to the pattern selected by the coding quantization selection unit 133 on the block (data) extracted by the block extraction unit 132. Do it. For example, when the pattern A1 of FIG. 4 is selected in the process of step S23, the encoding and quantizing unit 134 performs a DCT transform process on the input one block, and is further set in advance. A quantization process is executed based on the quantization table 1, and an entropy coding process such as Huffman coding is further performed. As a result, encoded data of the block is generated.

  In step S <b> 25, the output data generation unit 135 sets an identifier representing a pattern of each process applied to the encoded data of each block generated by the encoding and quantization unit 134. In step S26, the output data generation unit 135 generates control information based on the identifier, and outputs the control information to the data recording unit 123 together with the encoded data.

  At this time, the output encoded data is as shown in FIG. 8, for example. FIG. 8 shows an example in which each block constituting the lines 151 to 153 in FIG. 7 is individually coded and quantized. In the same figure, each block is shown by different hatching, and this represents that the encoding quantization process of the different pattern was individually performed with respect to each block.

  For example, the block 151a indicates that an encoding quantization process corresponding to the pattern A1 is performed, and the block 151b indicates that an encoding quantization process corresponding to the pattern A2 is performed. Control information is generated such as pattern A1, corresponding to block 151a, pattern A2,... Corresponding to block 151b. Further, the control information includes information indicating the respective phases of the lines 151 to 153 generated based on the information supplied from the phase adjustment unit 131 (for example, information indicating the horizontal position in FIG. 7). included.

  Thus, in the encoding process by the encoding process part 122, an encoding quantization process is individually performed with respect to each block extracted by the mutually different phase.

  A recording medium on which data is recorded by the processing described above with reference to FIG. 5 is reproduced by, for example, the reproducing device 201 shown in FIG. 9 and output to the display device 202 configured by a display or the like.

  A playback apparatus 201 in FIG. 9 is a playback apparatus corresponding to the recording apparatus 100 of the present invention, and the playback apparatus 201 includes a data acquisition unit 221, an encoding processing unit 222, and a D / A conversion unit 223. Yes.

  The data acquisition unit 221 reads data from a recording medium (for example, a DVD) attached to the playback device 201 and outputs the read data to the decryption processing unit 222.

  The decoding processing unit 222 decodes the encoded data in the data read from the data acquisition unit 221, and outputs the decoded data (decoded data) to the D / A conversion unit 223.

  The D / A conversion unit 223 converts the decoded data supplied from the decoding processing unit 222 into an analog signal and outputs the analog signal to the display device 202. As a result, an image corresponding to the data recorded on the recording medium is displayed on the display of the display device 202.

  FIG. 10 is a block diagram illustrating a detailed configuration example of the decoding processing unit 222. The decoding selection unit 241 selects one pattern from among a plurality of inverse coding quantization processing patterns performed by the decoding unit 243. Here, the inverse encoding quantization process corresponds to the encoding quantization process performed by the encoding quantization unit 134, and is specified based on control information included in the data supplied from the data acquisition unit 221. Is selected based on the pattern of the encoded quantization process to be performed.

  The phase adjustment unit 242 identifies the phase of the block of encoded data based on the control information included in the data supplied from the data acquisition unit 221. Thereby, for example, the start position and end position of the block in the encoded data are specified.

  The decoding unit 243 performs inverse coding quantization processing corresponding to the pattern of inverse coding quantization processing selected by the decoding selection unit 241 for each block of the encoded data. As a result, the coding quantization processing applied to each block of the encoded data is inversed and decoded (decoded) into data before being coded and quantized (encoded). The decoding unit 243 of the decoding processing unit 222 is configured to correspond to the encoding quantization unit 134 of the encoding processing unit 122, and for example, corresponds to the encoding quantization processing of each pattern in FIG. Inverse encoding quantization processing is executed.

  The inverse block processing unit 244 generates decoded data (image data) by arranging the data of each block decoded by the decoding unit 243 at a predetermined position.

  Next, data reproduction processing by the reproduction apparatus 201 will be described with reference to the flowchart of FIG.

  In step S51, the data acquisition unit 221 reads and acquires data from a recording medium (for example, a DVD) attached to the playback device 201.

  In step S52, the decryption processing unit 222 executes a decryption process described later with reference to FIG. 12 based on the data read from the data acquisition unit 221 in the process of step S51. As a result, decode data is generated and output to the D / A converter 223 as described above.

  In step S53, the D / A conversion unit 223 converts the decoded data supplied from the decoding processing unit 222 into an analog signal. In step S54, the analog signal converted by the processing in step S53 is output to the display device 202. To do. It should be noted that the analog signal output at this time is added with a signal distortion that naturally occurs when D / A conversion is performed (including white noise that occurs naturally).

  In this way, the data recorded by the process described above with reference to FIG. 5 is reproduced, and an image corresponding to the data recorded on the recording medium is displayed on the display of the display device 202.

  Next, the details of the decoding process in step S52 of FIG. 11 will be described with reference to the flowchart of FIG.

  In step S71, the decoding selection unit 241 checks the control information and acquires an identifier included in the control information. Here, the identifier is set as an identifier representing the pattern of each process applied to the encoded data of each block in step S25 of FIG.

  In step S72, the phase adjustment unit 242 specifies the phase of the block of encoded data based on the control information checked in step S71. Thereby, for example, the start position and end position of the block in the encoded data are specified.

  In step S73, the decoding selection unit 241 determines a decoding pattern (one pattern of a plurality of inverse encoding quantization processes performed by the decoding unit 243) based on the identifier acquired in the process of step S71. ) Is selected.

  In step S74, the decoding unit 243 performs an inverse encoding quantization process corresponding to the pattern of the inverse encoding quantization process selected by the decoding selection unit 241 in the process of step S72 on each block of the encoded data. To perform decryption. Thereby, for example, the block 151a of FIG. 8 encoded by the processing of the pattern A1 of FIG. 4 is inversely quantized based on the table 1 and further inversely DCT transformed. Further, the block 151b of FIG. 8 encoded by the processing of the pattern A2 of FIG. 4 is inversely quantized based on the table 2 and further inversely DCT transformed.

  In step S75, the deblocking processing unit 244 generates decoded data (image data) by arranging the data of each block decoded by the decoding unit 243 at a predetermined position. In step S76, the decoded data generated in step S75 is output to the D / A converter 223.

  As described above, in the decoding process performed by the decoding processing unit 222, each block extracted at a different phase is subjected to inverse coding quantization processing with a different pattern. Thereby, the encoded data as shown in FIG. 8 is appropriately decoded and an image is displayed.

  In this way, content (for example, an image or the like) that is played back by the playback apparatus 201 is not particularly scrambled, so there is a concern about the production of a duplicate (illegal copy) of the content. For example, in FIG. 9, content can be copied by inputting an analog signal output from the playback device 201 to the display device 202 to the copy manufacturing device 203. However, according to the present invention, since the image quality of the copy generated by the copy manufacturing apparatus 203 is extremely deteriorated, it is possible to prevent the production of an unauthorized copy as a result.

  The replica manufacturing apparatus 203 is configured as, for example, a conventional DVD recorder that is different from the recording apparatus 100 of the present invention, and similarly to the recording apparatus 100 of the present invention, the A / D conversion unit 321, the encoding processing unit 322, Although it has a data recording unit 323, the configuration of the encoding processing unit 322 is different from the encoding processing unit 122 (FIG. 3) of the recording apparatus 100.

  FIG. 13 is a block diagram illustrating a detailed configuration example of the encoding processing unit 322 of the replica manufacturing apparatus 203.

  In the figure, a block extraction unit 332, an encoded quantization unit 334, and an output data generation unit 335 correspond to the block extraction unit 132, the encoded quantization unit 134, and the output data generation unit 135 of FIG. Although it is a functional block and has the same function, unlike the case of FIG. 3, the functional block corresponding to the phase adjustment unit 131 and the encoding quantization selection unit 133 is not provided. For this reason, the data recording process performed by the replica manufacturing apparatus 203 is different from the data recording process performed by the recording apparatus 100.

  Specifically, the replica manufacturing apparatus 203 can perform the data recording process described above with reference to FIG. 5, but the encoding processing unit 322 is configured as shown in FIG. The details of the encoding process in step S2 are different from those described above with reference to FIG.

  Details of the encoding process executed by the encoding processing unit 322 of the replica manufacturing apparatus 203 will be described with reference to the flowchart of FIG.

  In step S101, the block extraction unit 332 extracts a block composed of a preset number of pixels in the data (image data). Here, the encoded data in FIG. 8 is reproduced, and the reproduced analog signal is converted into digital data (that is, data corresponding to FIG. 8), for example, as indicated by a dotted line 161 in FIG. Blocks will be extracted.

  That is, since the process corresponding to step S21 in FIG. 6 is not performed, the start of the block is performed in each of the first to third lines without changing the phase as in the lines 151 to 153. The position and end position are equal.

  Returning to FIG. 14, after the process of step S <b> 101, in step S <b> 102, the encoding quantization unit 334 performs encoding quantization on each block (data thereof) extracted in step S <b> 101. In step S103, the output data generation unit 335 performs entropy encoding processing on the data of each block encoded and quantized in step S102, and outputs the data as encoded data.

  The output encoded data is supplied to the data recording unit 323 of the replica manufacturing apparatus 203 and is recorded on a recording medium such as a DVD, and thus a replica is manufactured.

  In this way, the produced replica will be extremely degraded in image quality when reproduced. This will be described in more detail with reference to FIGS. 15 and 16. In the encoding process by the encoding processing unit 322, since the blocks are extracted as described above with reference to FIG. 15, the attributes of the data of each extracted block are as shown in FIG.

  That is, the image of the signal output from the playback device 201 is affected by the fact that each block has been subjected to different coding quantization processing (or inverse coding quantization processing) as in blocks 151a to 153f in FIG. Is receiving. For example, when quantizing data that has been subjected to DCT transformation, the horizontal edge in the image can be emphasized or the vertical edge can be emphasized due to the difference in the quantization table. Depending on the quantization table, there is an effect that distortion tends to occur in the vertical direction and distortion tends to occur in the horizontal direction. Thus, it can be said that the blocks 151a to 153f have different attributes.

  By extracting blocks 171a to 173e as shown in FIG. 16 in the process of step S101 of FIG. 14 for images having such attributes, the attributes of individual blocks are further complicated. Become. For example, the block 171a has the attributes of the four blocks 151a, 151b, 152a, and 152b. For example, the block 171a has four different types of distortion characteristics.

  For example, encoding quantization corresponding to the pattern A1 is performed on the block 151a, encoding quantization corresponding to the pattern A2 is performed on 151b, and so on. If an appropriate encoding process is performed, a recording medium similar to the original generated as described above with reference to FIG. 5 can be generated by the recording apparatus 100 and can be normally reproduced by the reproducing apparatus 201. However, even when a reproduction composed of data configured as shown in FIG. 16 is reproduced by the reproduction apparatus 201, the image quality of the displayed image is extremely deteriorated.

  Further, the analog signal input to the replica manufacturing apparatus 203 is distorted as described above by the A / D conversion unit 121 of the recording apparatus 100 and the D / A conversion unit 223 of the reproduction apparatus 201, and the data The image quality is further deteriorated as the operation of reproducing and duplicating is repeated.

  As described above, according to the present invention, the replica manufactured by the replica manufacturing apparatus 203 becomes almost worthless, and illegal copying can be prevented.

  The series of processes described above can be executed by hardware, or can be executed by software. When the above-described series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. For example, a general-purpose personal computer 500 as shown in FIG. 17 is installed from a network or a recording medium.

In FIG. 17, a CPU (Central Processing Unit) 501 is a ROM (Read Only Memory).
) Various processes are executed in accordance with a program stored in 502 or a program loaded from a storage unit 508 into a RAM (Random Access Memory) 503. The RAM 503 also appropriately stores data necessary for the CPU 501 to execute various processes.

  The CPU 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output interface 505 is also connected to the bus 504.

  The input / output interface 505 includes an input unit 506 including a keyboard and a mouse, a display including a CRT (Cathode Ray Tube) and an LCD (Liquid Crystal display), an output unit 507 including a speaker, and a hard disk. A communication unit 509 including a storage unit 508, a modem, a network interface card such as a LAN card, and the like is connected. A communication unit 509 performs communication processing via a network including the Internet.

  A drive 510 is connected to the input / output interface 505 as necessary, and a removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is appropriately attached, and a computer program read from them is loaded. It is installed in the storage unit 508 as necessary.

  When the above-described series of processing is executed by software, a program constituting the software is installed from a network such as the Internet or a recording medium such as the removable medium 511.

  The recording medium shown in FIG. 17 is a magnetic disk (including a floppy disk (registered trademark)) on which a program is recorded, which is distributed to distribute the program to the user separately from the apparatus main body. Removable media consisting of optical disks (including CD-ROM (compact disk-read only memory), DVD (digital versatile disk)), magneto-optical disks (including MD (mini-disk) (registered trademark)), or semiconductor memory It includes not only those configured by 511 but also those configured by a ROM 502 on which a program is recorded, a hard disk included in the storage unit 508, and the like distributed to the user in a state of being incorporated in the apparatus main body in advance.

  The steps of executing the series of processes described above in this specification are performed in parallel or individually even if they are not necessarily processed in time series, as well as processes performed in time series in the order described. It also includes processing.

It is a figure explaining the example of the conventional reproducing | regenerating apparatus and replica manufacturing apparatus. It is a figure explaining the mechanism of the manufacture prevention of the conventional replication. It is a block diagram which shows the structural example of the recording device of this invention. It is a figure which shows the example of the pattern of the process of an encoding quantization. It is a flowchart explaining the example of a data recording process. It is a flowchart explaining the example of an encoding process. It is a figure which shows the example of the phase of the block extracted. It is a figure which shows the example of the encoded block. It is a figure explaining the mechanism of the manufacture prevention of replication in the present invention. It is a block diagram which shows the structural example of a decoding process part. It is a flowchart explaining the example of a data reproduction process. It is a flowchart explaining the example of a decoding process. It is a block diagram which shows the structural example of the encoding process part of a replica manufacturing apparatus. It is a flowchart explaining the example of the encoding process by a replica manufacturing apparatus. It is a figure which shows the example of the block extracted with a replica manufacturing apparatus. It is a figure explaining the attribute of the data recorded on replication. And FIG. 16 is a block diagram illustrating a configuration example of a personal computer.

Explanation of symbols

  100 recording device, 122 encoding processing unit, 131 phase adjustment unit, 132 block extraction unit, 133 encoding quantization selection unit, 134 encoding quantization unit, 135 output data generation unit, 222 decoding processing unit, 241 decoding Selection unit, 242 Phase adjustment unit, 243 Decoding unit 244 Deblocking processing unit, 501 CPU, 511 Removable media

Claims (10)

An encoding device for encoding input digital data,
Phase changing means for changing and outputting the phase of the input digital data; and
A block extracting means for extracting a block from digital data output from the phase changing means by a preset method;
Encoding means for encoding the block extracted by the block extraction means;
An encoding apparatus comprising: output means for outputting the block encoded by the encoding means in association with information relating to the phase changed by the phase changing means. An encoding method selecting means for selecting an encoding method of the block extracted by the block extracting means;
The encoding means encodes the block extracted by the block extraction means by the encoding method selected by the encoding method selection means,
The output means further outputs the block encoded by the encoding means in association with information representing the encoding method selected by the encoding method selection means. The encoding device described. The encoding method selection means selects one encoding method corresponding to each block extracted by the block extraction means from a plurality of preset encoding methods. The encoding device according to claim 2. The encoding method selection means further selects one quantization method corresponding to each block extracted by the block extraction means from a plurality of preset quantization methods, and the encoding method 4. The encoding apparatus according to claim 3, wherein the means further quantizes the block based on a quantization method selected by the encoding method selection means. It further comprises conversion means for converting an input signal into digital data,
The encoding apparatus according to claim 1, wherein the phase changing unit changes the phase of the digital data converted by the converting unit and outputs the digital data. The encoding apparatus according to claim 5, wherein distortion associated with the conversion is added to the digital data converted by the conversion means. An encoding method of an encoding device for encoding input digital data,
A phase changing step in which the phase changing means changes and outputs the phase of the input digital data; and
A block extraction step for extracting a block by a preset method from the digital data output by the process of the phase changing step,
An encoding step in which an encoding means encodes the block extracted by the processing of the block extraction step;
An output step , wherein the output means includes an output step of outputting the block encoded by the processing of the encoding step in association with information relating to the phase changed by the processing of the phase changing step; Method. Computer
An encoding device for encoding input digital data,
Phase changing means for changing and outputting the phase of the input digital data; and
A block extracting means for extracting a block from digital data output from the phase changing means by a preset method;
Encoding means for encoding the block extracted by the block extraction means;
A program that functions as an encoding device, comprising: an output unit that outputs a block encoded by the encoding unit in association with information relating to a phase changed by the phase changing unit . Computer
An encoding device for encoding input digital data,
Phase changing means for changing and outputting the phase of the input digital data; and
A block extracting means for extracting a block from digital data output from the phase changing means by a preset method;
Encoding means for encoding the block extracted by the block extraction means;
A program that functions as an encoding device is recorded , comprising: an output unit that outputs a block encoded by the encoding unit in association with information relating to a phase changed by the phase changing unit. A recording medium characterized by that. An encoding unit that encodes the input data; and a decoding unit that decodes the data encoded by the encoding unit, and the decoding unit converts the image data encoded by the encoding unit. In the data processing system in which the image data obtained as a result of decoding is further encoded by the encoding and the image quality corresponding to the image data is degraded when the decoding unit decodes the image data.
The encoding unit includes:
Phase changing means for changing and outputting the phase of the input digital data; and
A block extracting means for extracting a block from digital data output from the phase changing means by a preset method;
Encoding means for encoding the block extracted by the block extraction means;
A data processing system comprising: an output unit that outputs the block encoded by the encoding unit in association with information relating to the phase changed by the phase changing unit.

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