JP2006217524A - Reproducing apparatus and method, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of surely preventing production of copies with a simple configuration at a low cost. <P>SOLUTION: A high image quality processing section 123 of a reproduction apparatus 101 applies high image quality processing to data acquired by a data acquisition section 121 to convert data. A D/A conversion section 124 converts the converted data into an analog signal, which is outputted to a display apparatus 102. The image quality of copies produced by a copy production apparatus 103 is deteriorated on the basis of the signal outputted to the display apparatus 102 in this way. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  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.

  Further, for example, in a display device such as a liquid crystal display device (LCD Liquid Crystal Display), there is a response delay characteristic that it takes time to actually reach a desired output level for a certain input regarding data display. . Therefore, in the display device 2 having the liquid crystal display 25 or the like as shown in FIG. 2, in order to improve the delay, an image quality enhancement process for improving the delay of the output response by giving an input that is larger than the level of the input signal. Some are provided with a portion 26.

  However, in FIG. 1 and FIG. 2, there is a possibility that a copy of content data can be easily manufactured without permission by inputting the analog signal output from the playback device 1 to the copy manufacturing device 3. 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. 3, the encoded data 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 is decoded ( 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 technique as shown in FIG. 3 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 and cost of the device. 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.

  A reproducing apparatus of the present invention is a reproducing apparatus that reproduces data recorded on a recording medium and outputs the reproduced data to a display device. The reproducing apparatus obtains data recorded on the recording medium; Decoding means for decoding the acquired data, conversion means for converting the data decoded by the decoding means by a method corresponding to the display device, and a signal corresponding to the data converted by the conversion means to the display device Output means for outputting.

  When the display device has an LCD, the conversion means can perform data overdrive processing on the data decoded by the decoding means to convert the data.

  When the display device has a PDP, the conversion means can perform data dithering on the data decoded by the decoding means in the spatial direction to convert the data.

  The conversion means includes a holding means for holding the data decoded by the decoding means for a preset time, a value of the data held in the holding means, and data that is currently input after being decoded by the decoding means. And a calculating unit that calculates a conversion amount of the value of the data that is currently input and is decoded by the decoding unit on the basis of the difference from the value.

  The calculation means can convert the data value based on a table in which the conversion amount of the data value is set.

  The table may be a table corresponding to a display device and describing a preset conversion amount.

  The table may be a table corresponding to a display device and describing a conversion amount set by a user.

  The reproduction method of the present invention is a reproduction method of a reproduction device that reproduces data recorded on a recording medium and outputs the data to a display device, and obtains data recorded on the recording medium; A decoding step for decoding the data acquired by the processing of the acquisition step, a conversion step for converting the data decoded by the processing of the decoding step by a method corresponding to the display device, and conversion by the processing of the conversion step And an output step of outputting a signal corresponding to the data to the display device.

  The program of the present invention is a program for playing back data recorded on a recording medium and causing a playback device that outputs the data to a display device to execute playback processing, and controls acquisition of data recorded on the recording medium Data acquisition control step, decoding control step for controlling decoding of data acquired by the process of acquisition control step, and conversion of data decoded by the process of decoding control step in a method corresponding to the display device The computer executes a conversion control step for controlling the output and an output control step for controlling output of a signal corresponding to the data converted by the processing of the conversion control step to the display device.

  The recording medium of the present invention is a recording medium in which a program for reproducing data recorded on the recording medium and outputting the output to the display device is recorded on the recording medium. A data acquisition control step for controlling the acquisition of the acquired data, a decoding control step for controlling the decoding of the data acquired by the processing of the acquisition control step, and a display of the data decoded by the processing of the decoding control step A program for causing a computer to execute a conversion control step for controlling conversion in a method corresponding to the device, and an output control step for controlling output to a display device of a signal corresponding to data converted by the processing of the conversion control step. It is recorded.

  In the playback apparatus and method, and the program of the present invention, data recorded on a recording medium is acquired, the acquired data is decoded, and the decoded data is converted by a method corresponding to the display device. A signal corresponding to the recorded data is output to the display device.

  According to the present invention, it is possible to prevent the production of a replica. In particular, it is possible to reliably prevent duplication 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 playback device according to claim 1 is a playback device that plays back data recorded on a recording medium and outputs the data to a display device (for example, the playback device 101 in FIG. 4), which is recorded on the recording medium. A data acquisition unit (for example, the data acquisition unit 121 in FIG. 4) that acquires the stored data, and a decoding unit (for example, the decoding processing unit 122 in FIG. 4) that decodes the data acquired by the acquisition unit; The data decoded by the decoding means is converted by a method corresponding to the display device (for example, the high image quality processing unit 123 in FIG. 4), and the data converted by the conversion means is supported. Output means (for example, the D / A converter 124 in FIG. 4) for outputting a signal to the display device.

  The reproduction apparatus according to claim 4, wherein the converting unit holds the data decoded by the decoding unit for a preset time (for example, the front input holding unit 302 in FIG. 12); Based on the difference between the value of the data held in the holding means and the value of the data decoded by the decoding means and currently input, the value of the data currently input by being decoded by the decoding means It is possible to provide calculation means for calculating the conversion amount (for example, the conversion amount calculation unit 304 in FIG. 12).

  According to a fifth aspect of the present invention, the calculation unit may convert the data value based on a table in which a conversion amount of the data value is set.

  The playback device according to claim 6 is such that the table is a table corresponding to the display device, and a table in which a preset conversion amount is described (for example, the conversion table 311 in FIG. 12). can do.

  In the playback device according to claim 7, the table is a table corresponding to the display device, and is a table in which a conversion amount set by a user is described (for example, a user setting table 312 in FIG. 12). Can be.

  The reproduction method according to claim 8 is a reproduction method of a reproduction device (for example, the reproduction device 101 in FIG. 4) that reproduces data recorded on a recording medium and outputs the data to a display device. A data acquisition step (for example, the process of step S1 in FIG. 13) for acquiring the data recorded in the above and a decoding step (for example, step S2 of FIG. 13) for decoding the data acquired by the process of the acquisition step ), A conversion step (for example, step S3 in FIG. 13) for converting the data decoded by the decoding step by a method corresponding to the display device, and conversion by the conversion step processing. An output step (for example, the process of step S5 in FIG. 13) for outputting a signal corresponding to the data to the display device.

  The program according to claim 9 is a program for reproducing data recorded on a recording medium and causing a reproduction device (for example, the reproduction device 101 in FIG. 4) that outputs the data to a display device to execute reproduction processing. A data acquisition control step (for example, the process of step S1 in FIG. 13) for controlling the acquisition of data recorded on the recording medium, and a decoding for controlling the decoding of the data acquired by the process of the acquisition control step Conversion control step (for example, step S2 in FIG. 13) and a conversion control step (for example, FIG. 13) for controlling the conversion of the data decoded by the decoding control step in a method corresponding to the display device. 13 and the output for controlling the output of the signal corresponding to the data converted by the process of the conversion control step to the display device. Please step (e.g., processing in step S5 in FIG. 13) and causes the computer to execute.

  The recording medium according to claim 10 is recorded with a program for reproducing data recorded on the recording medium and outputting the data to a display device (for example, the reproduction device 101 in FIG. 4). A data acquisition control step (for example, step S1 in FIG. 13) for controlling acquisition of data recorded on the recording medium, and the acquisition control step. Decoding control step for controlling the decoding of data (for example, the process of step S2 in FIG. 13) and the conversion of the data decoded by the process of the decoding control step in a method corresponding to the display device Conversion control step (for example, the process of step S3 in FIG. 13), and the display device of the signal corresponding to the data converted by the process of the conversion control step Output control step of controlling the output of the (for example, step S5 in FIG. 13) program for executing a computer has been recorded.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a block diagram showing a configuration example of a recording / reproducing system according to the present invention. In FIG. 1, a playback apparatus 101 to which the present invention is applied is configured as a DVD player, for example, and includes a data acquisition unit 121, a decoding processing unit 122, a high image quality processing unit 123, and a D / A conversion unit 124. Is provided.

  The data acquisition unit 121 reads data from a recording medium (for example, a DVD) attached to the playback device 101 and outputs the read data to the decryption processing unit 122. The data recorded on the recording medium is recorded as encoded data that has been compression-encoded through a process such as DCT transform (discrete cosine transform), for example.

  In the present case, the encoded data is generated by extracting pixels constituting the image data as a plurality of blocks, subjecting each block to DCT conversion, and quantizing the resulting DCT coefficients.

  The decoding processing unit 122 decodes (decodes) the encoded data that is the encoded data read from the data acquisition unit 121, and outputs the decoded data (decoded data) to the image quality improvement processing unit 123. To do.

  The high image quality processing unit 123 performs high image quality processing corresponding to the characteristics of the display device 102 on the decoded data (input signal) supplied from the decoding processing unit 122.

  For example, in a liquid crystal display (LCD), due to the structure of the display, there is a response delay characteristic that it takes time to actually reach a desired output level for a certain input regarding data display. Therefore, the image quality improvement processing unit 123 corresponds to the display device 102 having a liquid crystal display or the like, for example, a process (so-called overdrive process) for improving response delay by giving an input that is larger than the level of the input signal, This is performed as a high image quality process, and the decoded data subjected to the high image quality process is output to the D / A converter 124.

  In addition, a PDP (Plasma Display Panel) has a characteristic that the smoothness of a natural image is insufficient because the number of display gradations is limited. Therefore, the image quality enhancement processing unit 123 performs processing for performing dithering processing or the like on the input signal in the spatial direction to compensate for the lack of gradation, for example, in correspondence with the display device 102 having PDP or the like. The decoded data subjected to the high image quality processing is output to the D / A converter 124.

  The D / A conversion unit 124 converts the decode data supplied from the image quality improvement processing unit 123 into an analog signal and outputs the analog signal to the display device 102. As a result, an image corresponding to the data recorded on the recording medium is displayed on the display of the display device 102.

  Here, the analog signal corresponding to the decoded data converted by the high image quality processing generally has a greater signal strength than the analog signal corresponding to the decoded data before the high image quality processing. As a result of the conversion, the high frequency level in the signal is increased.

  With reference to FIGS. 5 to 11, the response delay characteristic and the example of the image quality enhancement process described above will be described in more detail. In FIG. 5, the vertical axis represents level (voltage value) and the horizontal axis represents time. For example, a waveform 201 of a driving signal of a pixel in the LCD and a waveform of a signal actually output based on the driving signal. FIG. The scale on the horizontal axis represents the time for one frame per scale.

  As shown in the figure, the waveform 201 of the drive signal changes (rises) from level V0 to V1 at time t0, and changes (falls) from level V1 to V0 at time t1. On the other hand, the waveform 202 of the actually output signal reaches level V1 after one frame or more has elapsed from time t0, and has returned to level V0 after one frame or more has elapsed from time t1. That is, the actually output signal changes (responds) with a delay with respect to the drive signal. For this reason, when a drive signal changes rapidly, the change of the signal actually output may not be in time, and a desired value may not be output.

  6 and 7 are diagrams for explaining the relationship between the change in the driving signal of the pixel of the LCD and the change in the actually output signal. Like FIG. 5, the vertical axis represents the level, and the horizontal axis represents the time. The waveform 211 of the drive signal and the waveform 212 of the signal that is actually output are shown. FIG. 6 shows a waveform 211 of the drive signal.

  As shown in FIG. 7, when the waveform 211 of the drive signal changes abruptly, the waveform 202 of the actually output signal has a desired value at each of the points A to C due to a response delay, for example. Not reached. That is, at the point A, the level of the signal that is actually output must originally reach the same level V11 as that of the drive signal, but only reaches a value slightly lower than the level V11 due to a delay in response. In addition, at the point B, the level of the signal that is actually output must originally reach the same level V12 as that of the drive signal, but only reaches a value slightly higher than the level V12 due to a delay in response. Further, at the point C, the level of the signal that is actually output must originally reach the same level V13 as that of the drive signal, but only reaches a value slightly lower than the level V13 due to a delay in response.

  In order to improve such a response delay, the image quality improvement processing unit 123 performs a process of improving the response delay by giving an input (change) larger than the level of the input signal. Thereby, for example, as shown in FIG. 8, the drive signal (waveform 211) is converted into a waveform 221. In this example, the waveform 221 is converted with respect to the waveform 211 so that the magnitude of the signal change is greater.

  By converting the drive signal in this way, the actually output signal (waveform 212) is converted into a waveform 222 shown in FIG. As shown in the figure, in the waveform 222, the point A ′ corresponding to the point A of the waveform 212 is converted to a value higher than the point A, and the point B ′ corresponding to the point B of the waveform 212 is The point C ′ corresponding to the point C of the waveform 212 has been converted to a value higher than that of the point C.

  In this way, response delay can be improved by giving an input that is greater than the level of the input signal (so-called overdrive processing is performed).

  In practice, the drive signal is more complicatedly converted. For example, in the case of the waveform 231 of the drive signal shown in FIG. 10, the waveform continues to hold the level V21 after changing to the level V21 at time t21, but the signal that is actually output with a response delay is driven. In order to approach the signal, as described above, it is necessary to convert the signal so as to have a value higher than the level V21 at time t21. However, if the level of the drive signal becomes higher than the level V21, the level of the signal that is actually output also follows with a delay, so the signal that is actually output is higher than the original level V21. Will continue to hold the waveform. For this reason, it is necessary to convert the drive signal again so as to be a value lower than the level V21.

  As described above, when the drive signal is converted, the waveform 231 of the drive signal shown in FIG. 10 is converted into a waveform 232 in FIG. As shown in the figure, in the waveform 232, after time t21, the level is converted so as to increase and decrease in small increments across the level V21.

  Since the image quality improvement processing unit 123 performs processing for improving response delay (signal conversion by the above-described overdrive processing) in this way, an analog signal corresponding to the decoded data converted by the image quality improvement processing is Compared with the analog signal corresponding to the decoded data before the high image quality processing is performed, the signal change is greatly changed and the signal change cycle is shortened (that is, the signal is changed). The high frequency level inside is increased).

  FIG. 12 is a block diagram illustrating a detailed configuration example of the image quality improvement processing unit 123 of FIG. In the figure, a difference calculation unit 301 calculates the difference between the value of data (signal) that is currently input and the value held in the previous input holding unit 302. The previous input holding unit 302 holds a value of data immediately before the currently input data (for example, data before one clock) and supplies the value to the difference calculation unit 301. That is, for example, the difference calculation unit 301 calculates the amount of data change by calculating the difference between the value of the input data one clock before and the value of the currently input data. The difference (data change amount) calculated by the difference calculation unit 301 is output to the conversion method switching unit 303.

  For example, the conversion method switching unit 303 converts the difference calculated by the difference calculation unit 301 into the conversion amount calculation together with information for selecting the conversion amount calculation method in the conversion amount calculation unit 304 based on a command by a user operation or the like. Output to the unit 304. Here, the conversion amount calculation method selected may be, for example, either a method for calculating the conversion amount based on a preset conversion table or a method for calculating the conversion amount based on a table set by the user. Is selected.

  Based on the information for selecting the calculation method supplied from the conversion method switching unit 303, the conversion amount calculation unit 304 converts the conversion table 311 (pre-set conversion table) or the user setting table 312 (table set by the user). ) To calculate the conversion amount.

  For example, the conversion table 311 is a table in which the conversion amount for converting the current input value to be larger or smaller corresponding to the data change amount (difference) is described. For example, the conversion table 311 is calculated by the difference calculation unit 301. When the data change amount (actual change amount) is +3, a conversion amount (in this case, +1) for converting the current input value larger so that the change amount becomes +4. When the calculated change amount of the data (actual change amount) is −5, a conversion amount for converting the current input value smaller so that the change amount becomes −7 (in this case, − 2) etc. are described. The conversion amount calculation unit 304 outputs a conversion amount corresponding to the data change amount (difference) calculated in this way to the input data conversion unit 305.

  The input data conversion unit 305 converts the value of currently input data based on the conversion amount output from the conversion amount calculation unit 304 and outputs the converted value to the D / A conversion unit 124. According to the high image quality processing unit 123 configured in this way, for example, the drive signal waveform 211 shown in FIG. 6 is converted into a waveform 221 shown in FIG.

  Next, an example of data reproduction processing by the reproduction apparatus 101 in FIG. 4 will be described with reference to the flowchart in FIG.

  In step S <b> 1, the data acquisition unit 121 reads and acquires data from a recording medium (for example, a DVD) attached to the playback apparatus 101.

  In step S2, the decryption processing unit 122 performs a decryption process described later with reference to FIG. 14 based on the data read from the data acquisition unit 121 in the process of step S1. As a result, the decode data is generated as described above and output to the image quality enhancement processing unit 123.

  In step S3, the image quality improvement processing unit 123 performs an image quality improvement process which will be described later with reference to FIG. As a result, the value of the input data is converted and output to the D / A conversion unit 124 as described above.

  In step S4, the D / A conversion unit 124 converts the data supplied from the image quality improvement processing unit 123 into an analog signal, and in step S5, outputs the analog signal converted in the process of step S4 to the display device 102. To do.

  In this way, the recorded data is reproduced, and an image corresponding to the data recorded on the recording medium is displayed on the display of the display device 102.

  Next, the details of the decoding process in step S2 of FIG. 13 will be described with reference to the flowchart of FIG.

  In step S31, the decoding processing unit 122 performs a decoding process described later with reference to FIG. 15 on each block of the encoded data.

  Here, an example of the decoding process will be described with reference to the flowchart of FIG. Here, an example in which data encoded by DCT conversion is decoded will be described.

  In step S51, the decoding processing unit 122 performs inverse entropy encoding on the encoded data of the supplied block. As a result, the block is in a state before entropy encoding is performed.

  In step S52, the decoding processing unit 122 performs inverse quantization on the data obtained as a result of the processing in step S51. In step S53, the decoding processing unit 122 performs IDCT transformation (inverse discrete cosine transformation) on the data obtained as a result of the processing in step S52. As a result, the block is substantially the same as before the encoding process.

  In this way, the encoded data of the encoded block is decoded.

  Returning to FIG. 14, in step S <b> 32, the decoding processing unit 122 generates decoded data (image data) by arranging the data of each block decoded by the processing in step S <b> 31 at a predetermined position. In step S33, the decoded data generated in step S32 is output to the D / A converter 124.

  Next, the details of the image quality enhancement processing in step S3 in FIG. 13 will be described with reference to the flowchart in FIG.

  In step S <b> 71, the difference calculation unit 301 acquires a value (input value) of currently input data.

  In step S72, the difference calculation unit 301 calculates the difference between the input value acquired in step S71 and the value (previous input value) held in the previous input holding unit 302. As described above, the previous input holding unit 302 holds the value of data immediately before the currently input data (for example, data before one clock), supplies the value to the difference calculation unit 301, and the difference calculation unit For example, 301 calculates the amount of change in data by calculating the difference between the value of the input data one clock before and the value of the currently input data.

  In step S73, the conversion amount calculation unit 304 converts the input value by calculating the conversion amount using the conversion table 311 (preliminary conversion table) or the user setting table 312 (table set by the user). To do.

  In step S <b> 74, the input data conversion unit 305 converts the value of the currently input data based on the conversion amount output from the conversion amount calculation unit 304 in the process of step S <b> 73 and outputs the converted value to the D / A conversion unit 124. To do.

  In this way, for example, the image quality improvement process is performed in which the waveform 211 of the drive signal shown in FIG. 6 is converted into the waveform 221 shown in FIG. As described above, the analog signal corresponding to the decoded data converted by the high image quality processing has a signal change strength compared to the analog signal corresponding to the decoded data before the high image quality processing is performed. It will be greatly transformed.

  Further, for example, when the waveform 231 of the drive signal shown in FIG. 10 is converted like the waveform 232 shown in FIG. 11, the analog signal corresponding to the decoded data converted by the image quality improvement processing is improved in image quality. Compared with the analog signal corresponding to the decoded data before being processed, the signal is converted so that the period of change of the signal is shortened.

  Therefore, the high-frequency level in the signal is increased by performing the image quality improvement processing.

  In this way, when the video / audio reproduced by the reproducing apparatus 101 is acquired and recorded on a DVD or the like to attempt to produce a copy of the data reproduced by the reproducing apparatus 101, as shown in FIG. It is conceivable to use the replica manufacturing apparatus 103.

  In FIG. 4, the replica manufacturing apparatus 103 is configured as a DVD recorder, for example. The replica manufacturing apparatus 103 converts the analog signal output from the playback apparatus 101 (analog signal input to the replica manufacturing apparatus 103) into digital data by the A / D converter 141, and encodes the converted data. It is configured to produce a copy of a DVD to be played back by the playback apparatus 101 by encoding (encoding) the data in the unit 142 and recording it on a recording medium attached to the recording unit 143.

  An example of data recording processing by the replica manufacturing apparatus 103 will be described with reference to the flowchart of FIG.

  In step S101, the A / D converter 141 converts the input analog signal into digital data.

  In step S102, the encoding processing unit 142 executes an encoding process which will be described later with reference to FIG. As a result, as described above, encoded data based on the data output from the A / D converter 141 is output.

  In step S103, the data recording unit 143 records the encoded data output in the process of step S102 on a recording medium such as a DVD.

  In step S104, the replica manufacturing apparatus 103 determines, for example, whether or not the end of the process has been commanded by a user operation or the like. If it is determined that the end has not been commanded yet, the process proceeds to step S101. The process after that is repeated. If it is determined in step S104 that termination has been commanded, the process ends.

  In this way, data (for example, image data) is recorded.

  Next, the details of the encoding process in step S102 of FIG. 17 will be described with reference to the flowchart of FIG.

  In step S121, the encoding processing unit 142 extracts a block composed of a preset number of pixels (for example, 8 × 8 pixels) in the data (image data).

  In step S122, the encoding processing unit 142 performs an encoding process described later with reference to FIG. 19 on each block (data) extracted in the process of step S121. In step S123, the encoding processing unit 142 outputs the data of each block subjected to the encoding process in step S122 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 by the process of step S103 in FIG. It will be manufactured.

  Here, the details of the encoding process in step S122 in FIG. 18 will be described with reference to the flowchart in FIG. Here, an example of encoding processing by DCT conversion will be described.

  In step S141, the encoding processing unit 142 performs DCT conversion on the pixel data of the block extracted and supplied by the process of step S121 of FIG.

  In step S142, the encoding process part 142 quantizes the DCT coefficient obtained as a result of the process of step S141.

  In step S143, the encoding processing unit 142 converts the data quantized by the processing in step S142 into a variable length code such as a Huffman code, and performs entropy encoding.

  In this way, encoding processing by DCT conversion is performed. In the DCT transformation, each block constituting the image data is DCT transformed (step S141), and the resulting DCT coefficient is quantized (step S142). When the DCT coefficient is quantized, the power of the low frequency component of the image is extremely large, and the quantization step size of the low frequency component of the DCT coefficient is reduced and the high frequency component is quantized. By increasing the step size, the information amount of the entire image is compressed. For this reason, the DCT method is widely used as a compression method suitable for storage in a low frequency range.

  However, the high-frequency component of the signal converted by the image quality improvement processing in FIG. 16 has an increased high frequency component as described above, and is generally difficult to compress or causes distortion and deterioration when compressed. If a signal with an increased high-frequency component is recorded without causing distortion, the signal is generally compressed at a low level, and a large amount of information is used, so that the so-called bit rate is increased. However, in a recording medium such as a DVD, the data bit rate has an upper limit as defined by the standard and the like, and recording cannot be performed while maintaining the image quality.

  As a result, when the reproduction produced by the reproduction production apparatus 103 is reproduced, the image quality of the displayed image is significantly deteriorated.

  Although an example of encoding processing by DCT conversion has been described here, the encoding processing is not limited to the DCT method. For example, an encoding process using conversion such as DST (Discrete Sine Transform) or DWT (Discrete Wavelet Transform) may be performed. In these encoding processes as well, high compression is realized by reducing the redundancy of high-frequency signals in image signals and the like, and the same effect as when encoding processes by DCT conversion can be obtained.

  In the above description, the high image quality processing corresponding to the display device 102 having the LCD has been described as an example. However, the present invention is applied even when the high image quality processing corresponding to the display device 102 having the PDP is performed. Can do. As described above, the image quality improvement processing unit 123 performs processing for performing dithering processing or the like on the input signal in the spatial direction to compensate for the lack of gradation, for example, corresponding to the display device 102 having PDP or the like. This is performed as an image quality enhancement process. In this case as well, the signal subjected to the high image quality processing has an increased high frequency component and cannot be recorded on a recording medium such as a DVD while maintaining the image quality. When the reproduced copy is reproduced, the image quality of the displayed image is significantly deteriorated.

  Further, the display devices may have different display characteristics. For this reason, for example, it is possible to cause the image quality enhancement processing unit 123 to perform an image quality enhancement process that makes the image appear best on each display device.

  In this case, for example, the image quality improvement processing unit 123 performs conversion based on the user setting table 312 by storing the conversion amount of the image quality improvement processing suitable for the display device of the user in the user setting table 312. Then, a signal subjected to the high image quality processing specific to the display device is output. Therefore, the output signal becomes a signal that is not suitable for compression coding, or even if the signal is stored as it is without being compressed, the image is not properly displayed on other display devices.

  Accordingly, in this case as well, when the reproduction produced by the reproduction production apparatus 103 is reproduced, the image quality of the displayed image is significantly deteriorated.

  Further, in the above, the data that has been subjected to the image quality improvement processing by the image quality improvement processing unit 123 of the playback apparatus 101 and converted into the analog signal by the D / A conversion unit 124 is input to the replica manufacturing apparatus 103. However, for example, even if an attempt is made to manufacture a replica by acquiring digital data without using the D / A converter 124, the acquired data has a high bit rate. Also, it becomes impossible to record on a recording medium such as a DVD while maintaining the image quality.

  As described above, according to the present invention, the replica manufactured by the replica manufacturing apparatus 103 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 shown in FIG. 20 is installed from a network or a recording medium.

In FIG. 20, 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, a hard disk, and the like. A communication unit 509 including a storage unit 508, a network interface card such as a modem and 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. 20 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 conventional reproducing | regenerating apparatus and replica manufacturing apparatus. It is a figure explaining the example of the conventional image quality improvement process. It is a figure explaining the mechanism of the manufacture prevention of the conventional replication. It is a block diagram explaining the structural example of the reproducing | regenerating apparatus of this invention, and the mechanism of the manufacture prevention of replication. It is a figure explaining the characteristic of a response delay. It is a figure which shows the example of the waveform of the drive signal of a pixel. FIG. 7 is a diagram illustrating an example of an output signal with respect to the drive signal in FIG. 6. It is a figure which shows the example of conversion of a drive signal. It is a figure which shows the example of the output signal with respect to the drive signal of FIG. It is a figure which shows the example of the waveform of the drive signal of a pixel. It is a figure which shows the example of conversion of the drive signal of FIG. It is a block diagram which shows the structural example of an image quality improvement 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 flowchart explaining the example of a decoding process. It is a flowchart explaining the example of an image quality improvement process. It is a flowchart explaining a data recording process. It is a flowchart explaining the example of an encoding process. It is a flowchart explaining the example of an encoding process. And FIG. 16 is a block diagram illustrating a configuration example of a personal computer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 Playback apparatus, 102 Display apparatus, 103 Replication production apparatus, 121 Data acquisition part, 122 Decoding process part, 123 High quality image processing part, 142 Encoding process part, 301 Difference calculation part, 302 Pre-input holding part, 303 Conversion System switching unit, 304 conversion amount calculation unit, 305 input data conversion unit, 501 CPU, 511 removable media

Claims (10)

A playback device that plays back data recorded on a recording medium and outputs the data to a display device,
Data acquisition means for acquiring data recorded in the recording medium;
Decoding means for decoding the data acquired by the acquisition means;
Conversion means for converting the data decoded by the decoding means in a manner corresponding to the display device;
An output means for outputting a signal corresponding to the data converted by the conversion means to the display device. The conversion means, when the display device has an LCD (Liquid Crystal Display), performs an overdrive process on the data decoded by the decoding means to convert the data. The reproducing apparatus according to 1. When the display device has a PDP (Plasma Display Panel), the conversion means performs a dithering process on the data decoded by the decoding means in a spatial direction to convert the data. The playback apparatus according to claim 1. The converting means includes
Holding means for holding the data decoded by the decoding means for a preset time;
Based on the difference between the value of the data held in the holding means and the value of the data that has been decoded and is currently input by the decoding means, the data is decoded by the decoding means, and The reproducing apparatus according to claim 1, further comprising: a calculating unit that calculates a conversion amount of the value. The calculating means includes
The playback device according to claim 4, wherein the data value is converted based on a table in which a conversion amount of the data value is set. The playback device according to claim 5, wherein the table is a table corresponding to the display device, in which a preset conversion amount is described. 6. The playback apparatus according to claim 5, wherein the table is a table corresponding to the display device and describing a conversion amount set by a user. A reproduction method for a reproduction device for reproducing data recorded on a recording medium and outputting the data to a display device,
A data acquisition step of acquiring data recorded on the recording medium;
A decoding step of decoding the data acquired by the processing of the acquisition step;
A conversion step of converting the data decoded by the processing of the decoding step by a method corresponding to the display device;
An output step of outputting a signal corresponding to the data converted by the process of the conversion step to the display device. A program for reproducing data recorded on a recording medium and causing a reproduction device that outputs the data to a display device to execute reproduction processing,
A data acquisition control step for controlling acquisition of data recorded in the recording medium;
A decoding control step for controlling decoding of the data acquired by the processing of the acquisition control step;
A conversion control step for controlling the conversion of the data decoded by the processing of the decoding control step in a method corresponding to the display device;
A program causing a computer to execute an output control step of controlling output of a signal corresponding to data converted by the processing of the conversion control step to the display device. A recording medium on which a program for reproducing data recorded on a recording medium and causing a reproducing device to output to a display device to execute reproduction processing is recorded,
A data acquisition control step for controlling acquisition of data recorded on the recording medium;
A decoding control step for controlling decoding of the data acquired by the processing of the acquisition control step;
A conversion control step for controlling the conversion of the data decoded by the processing of the decoding control step in a method corresponding to the display device;
A recording medium is recorded with a program for causing a computer to execute an output control step for controlling output of the signal corresponding to the data converted by the process of the conversion control step to the display device.

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