JP5060509B2 - Information processing apparatus and caption text data conversion method - Google Patents

Description

  The present invention is suitable for, for example, a personal computer or a video recorder that can record digital television broadcast program data and can transfer the recorded digital television broadcast program data to a mobile phone, a PDA (Personal Digital Assistant), or the like. The present invention relates to a technology for converting subtitle sentence data.

  In recent years, electronic devices capable of reproducing moving image data have become widespread. For example, a large amount of video content can be stored using a desktop personal computer equipped with a large-capacity HDD (Hard Disk Drive) and copied to a portable music player equipped with a video playback function as needed. In addition, usage such as going out and enjoying while traveling is becoming common.

  Recently, subtitle text data is provided separately from main image data, and these are multiplexed to form moving image data. Thereby, for example, it is possible to view the moving image data with multilingual subtitles.

  By the way, in this caption text data, there are cases where external character data uniquely defined for each specification is mixed in addition to standard character data. Therefore, when subtitle text data created based on a certain external character specification is displayed on a player that complies with different external character specifications, some measure for displaying the external character data is required. For this reason, various mechanisms for maintaining compatibility of external character data have been proposed (see, for example, Patent Document 1).

JP 2000-242259 A

  Subtitle text data included in digital television broadcast program data that is broadcast in full segment (using 12 segments out of 13 segments) can be dynamically defined with external character fonts using DRCS (Dynamic Re-definable Character Set). . On the other hand, in the Timed Text format defined by 3GPP TS 26.234, there is no function for dynamically defining an external character font. Therefore, when digital TV broadcast program data including subtitle text data in which an external character font is dynamically defined in DRCS is played back by a player that processes subtitle text data on the assumption that it is in Timed Text format, Could not be displayed, there was a risk that the display of the entire subtitle sentence would be corrupted.

  The present invention has been made in consideration of such circumstances. For example, an external character font dynamically defined by DRCS included in caption text data of moving image data is defined by 3GPP TS 26.234. It is an object of the present invention to provide an information processing apparatus and a caption text data conversion method that can be displayed even after conversion to the Timed Text format.

  In order to achieve the above object, an information processing apparatus according to the present invention includes subtitle sentence data in a first format that can be specified by dynamically defining an external character font by bitmap data, which is included in moving image stream data. An information processing apparatus having a function of converting to subtitle sentence data in a second format that specifies an external character font using a character code uniquely assigned to each character, wherein the subtitle sentence in the first format An external character font generating means for generating an external character font from bitmap data included in the data; a character code setting means for setting a character code for the external character font generated by the external character font generating means; and the external font generating means. Conversion data indicating the correspondence between the generated external font and the character code set by the character code setting means Conversion data storage means for storing, and a character code set by the character code setting means in the first-format caption text data where a dynamically defined and designated external character font is defined by the bitmap data Subtitle sentence data converting means for converting the first form of subtitle sentence data into the second form of subtitle sentence data by designating the replacement generated font, and the conversion stored in the converted data storage means Output means for outputting the moving image data including the subtitle sentence data in the second format converted from the subtitle sentence data in the first format by the subtitle sentence data conversion means together with the data. Features.

  According to the present invention, for example, an external character font dynamically defined by DRCS included in caption text data of moving image data is displayed even after being converted to the Timed Text format defined by 3GPP TS 26.234. Make it possible.

The figure which shows an example of the utilization form of the information processing apparatus which concerns on embodiment of this invention. The figure which shows the structure of the caption conversion apparatus with which the information processing apparatus of the embodiment is provided. The figure which shows the example of 1 structure of the DRCS conversion data produced by the DRCS conversion process part of the caption conversion apparatus with which the information processing apparatus of the embodiment is provided. 6 is an exemplary flowchart illustrating a specific processing flow of the caption conversion device included in the information processing apparatus of the embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an example of a usage pattern of an information processing apparatus according to an embodiment of the present invention. The information processing apparatus 1 receives, for example, digital television broadcast program data broadcast from the broadcast station 2a, or receives digital television broadcast program data from the broadcast server 2b via the Internet for playback and recording. It is realized as a personal computer having a television function (TV function) to be performed. The digital television broadcast program data received by the information processing apparatus 1 is high-quality moving image data for full segment broadcasting.

  The information processing apparatus 1 also has a function of copying digital television broadcast program data recorded by the TV function to a mobile phone 3 having a moving image reproduction function. Here, it is assumed that the mobile phone 3 processes the caption text data included in the moving image data on the premise that it is in the Timed Text format defined by 3GPP TS 26.234. On the other hand, subtitle text data included in digital television broadcast program data to be broadcast in full segment can dynamically define an external character font by using a dynamic re-definable character set (DRCS). In the Timed Text format described above, there is no function for dynamically defining an external character font. Therefore, in some cases (when a dynamically defined external character font is included in the caption text data), there is a risk that the mobile phone 3 may interfere with the reproduction of the digital television broadcast program data. Therefore, the information processing apparatus 1 includes a caption conversion device 100 that performs conversion of caption text data so that an external character font defined in DRCS can be displayed even after conversion to Timed Text format. The principle of subtitle sentence data conversion by the subtitle conversion apparatus 100 will be described in detail.

  FIG. 2 is a diagram illustrating a configuration of the caption conversion device 100 included in the information processing apparatus 1.

  As shown in FIG. 2, the caption conversion device 100 includes an input PES buffer 101, a content information management unit 102, a caption management data processing unit 103, a caption sentence conversion processing unit 104, a DRCS conversion processing unit 105, and a DRCS conversion data storage unit. 106, a caption sentence combination processing unit 107, and an output buffer 108.

  The subtitle conversion apparatus 100 receives a PES packet storing subtitle sentence data to be displayed and a PES packet storing subtitle sentence management data for display control, and accumulates them in the input PES buffer 101. Further, the subtitle conversion apparatus 100 also receives content information such as a broadcasting station, program name, broadcasting time, and genre related to the digital television broadcast program data to which the subtitle sentence data belongs by the content information management unit 102.

  After the PES packets are accumulated in the input PES buffer 101, the caption sentence management data is sent to the caption management data processing unit 103 that analyzes the control information, while the caption sentence data is sent to the caption sentence conversion processing unit 104. Then, conversion to the Timed Text format is performed by performing format conversion, character code conversion processing from 8-unit code to Unicode, and the like. At this time, if the DRCS is stored in the caption text management data or the caption text data, the DRCS conversion processing by the DRCS conversion processing unit 105 is executed.

  First, DRCS conversion data used when performing DRCS conversion processing by the DRCS conversion processing unit 105 will be described. FIG. 3 is a diagram illustrating a configuration example of DRCS conversion data created by the DRCS conversion processing unit 105 and registered in the DRCS conversion data storage unit 106.

  DRCS dynamically defines an external character font by bitmap data and a DRCS code for identification and a type (1-byte DRCS / 2-byte DRCS). Therefore, the caption conversion device 100 converts the DRCS converted data into the input DRCS bitmap data (a1), DRCS code / type (a2) and program parameters (broadcast station, program name, The recording time, genre: a3), a character code (a4) set at the time of conversion, and font data (a5) generated at the time of conversion are combined.

  When DRCS is input, bitmap data is converted into font data by the DRCS conversion processing unit 105, and a character code is set (with input bitmap data, DRCS code / type, and program parameters). ) It is registered in the DRCS conversion data storage unit 106 as DRCS conversion data. This font data can be a bitmap font or an outline font based on the specifications of the mobile phone 3 that is the copy destination of the digital television broadcast program data.

  Thereafter, when DRCS is input to the DRCS conversion processing unit 105, it is compared with the DRCS conversion data in the DRCS conversion data storage unit 106, and when the same bitmap data is not registered, the above conversion processing is performed. The basic process flow is that the DRCS conversion data created thereby is additionally registered in the DRCS conversion data storage unit 106. Note that this DRCS conversion data may be saved as data even after the caption conversion process is completed and reused.

  Next, a specific processing flow of the caption conversion device 100 will be described with reference to the flowchart of FIG.

  First, the DRCS conversion processing unit 105 checks whether or not caption management data is updated (step S1). When the caption management data is updated, the correspondence between the bitmap data in the DRCS and the DRCS code is cleared. Therefore, when updated (YES in step S1), the data is stored in the DRCS conversion data storage unit 106. All the DRCS code / type fields (a2 in FIG. 3) in the DRCS conversion data are cleared (step S2).

  On the other hand, when the subtitle management data has not been updated (NO in step S1), the DRCS conversion processing unit 105 executes a search in the DRCS conversion data storage unit 106 using the input DRCS code and type as a key ( Step S3). If DRCS conversion data matching the DRCS code and type is detected (YES in step S4), the conversion process for this DRCS has already been performed, so this process ends.

  If no DRCS conversion data matching the DRCS code and type is detected in this search (NO in step S4), the DRCS conversion processing unit 105 next detects that the input DRCS bitmap data and DRCS conversion data Bitmap data matching is performed (step S5). When the number of bitmap data is large, it may be possible to narrow down or sort the matching order by using an arbitrary item of program parameters.

  If the search does not match (NO in step S6), the DRCS conversion processing unit 105 generates a font from the DRCS bitmap data (step S7). As described above, the font to be generated may be a bitmap font or an outline font. When converting to a bitmap font, font data of a predetermined plurality of sizes is generated. At this time, conversion may not be possible depending on the input bitmap data. In this case, conversion may be made to a specific symbol (blank, ◯, □, etc.).

  Further, the DRCS conversion processing unit 105 sets a character code for the font generated from the DRCS bitmap data in this way. As a character code to be set, for example, a freely setable code such as a private use area of Unicode is designated. The DRCS conversion processing unit 105 registers the generated character code and the set character code in the DRCS conversion data storage unit 106 as DRCS conversion data together with the input DRCS bitmap data, code, and type. Thereby, when DRCS is designated in the caption text data, the caption sentence conversion processing unit 104 designates the character code set by the DRCS conversion processing unit 105 in the character code conversion process. become.

  The subtitle conversion apparatus 100 outputs the timed text data generated by the subtitle sentence conversion processing unit 104 via the output buffer 108 and is generated by the DRCS conversion processing unit 105 (in the DRCS conversion data storage unit 106). ) Output font data.

  As described above, according to the information processing apparatus 1, for example, an external character font dynamically defined by DRCS included in caption text data of moving image data is converted to a Timed Text format defined by 3GPP TS 26.234. It is possible to display even after the conversion.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine a component suitably in different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Information processing apparatus, 2a ... Broadcasting station, 2b ... Broadcast server, 3 ... Mobile phone, 100 ... Subtitle conversion apparatus, 101 ... PES buffer, 102 ... Content information management part, 103 ... Subtitle management data processing part, 104 ... Subtitle Sentence conversion processing unit, 105... DRCS conversion processing unit, 106... DRCS conversion data storage unit, 107.

Claims (12)

The subtitle text data in the first format, which can be specified by dynamically defining the external character font by the bitmap data, included in the moving image stream data, the external character font using the character code uniquely assigned to each character An information processing apparatus having a function of converting into subtitle sentence data in a second format that designates
External character font generation means for generating an external character font from bitmap data included in the caption text data of the first format;
A character code setting means for setting a character code for the external character font generated by the external character font generation means;
Conversion data storage means for storing conversion data indicating a correspondence relationship between the external font generated by the external font generation means and the character code set by the character code setting means;
The generated font is designated by replacing the portion where the dynamic character definition and designation of the external character font by the bitmap data is performed with the character code set by the character code setting means in the caption text data of the first format. Subtitle sentence data converting means for converting the subtitle sentence data of the first format into the subtitle sentence data of the second format;
Output the moving image data including the subtitle sentence data of the second format converted from the subtitle sentence data of the first format by the subtitle sentence data conversion means together with the conversion data stored in the conversion data storage means Output means for
An information processing apparatus comprising:   The information processing apparatus according to claim 1, wherein the external character font generation unit generates a bitmap font or an outline font as an external font.   The information processing apparatus according to claim 2, wherein the external character font generation unit generates a bitmap font having a plurality of sizes when generating a bitmap font as an external font.   The converted data storage means includes bitmap data included in the caption text data in the first format and an identification code for identifying the bitmap data, the external font generated by the external font generation means, and the 3. The information processing apparatus according to claim 2, further storing the converted data in association with a character code set by a character code setting means.   When the bitmap data included in the caption text data in the first format is input, it is checked whether or not the identification code attached to the bitmap data is stored in the converted data storage means. In this case, the similarity between all the bitmap data stored in the converted data storage means is checked, and when there is no bitmap data exceeding a predetermined reference value, The apparatus further comprises a control unit that causes the external character font generation unit, the character code setting unit, and the conversion data storage unit to execute generation of a font, setting of the character code, and storage of the conversion data. 3. The information processing apparatus according to 3. The converted data storage means further stores, as the converted data, a program parameter including at least an identifier of a broadcasting station that broadcasts the moving image data,
When the control means inputs the bitmap data included in the caption text data of the first format, and the identification code attached to the bitmap data is not stored in the converted data storage means, the program Using parameters, narrow down the target of examining similarity from all bitmap data stored in the converted data storage means, or determine the order of examining similarity
The information processing apparatus according to claim 5.   The subtitle sentence data conversion means, when the external character font cannot be generated by the external character font generation means for the bitmap data included in the first form subtitle sentence data, the subtitle sentence of the first format The information processing apparatus according to claim 1, wherein a character code of a specific symbol is arranged at a location where an external character font is dynamically defined and specified by the bitmap data in the data.   The first format subtitle text data is dynamically defined by an external character font by DRCS (Dynamic Re-definable Character Set), and the second format subtitle text data is 3GPP TS 26.234. The information processing apparatus according to claim 1, wherein the information processing apparatus is created in a Timed Text format defined by: The subtitle text data in the first format that can be specified by dynamically defining an external character font by using a bitmap data set, included in the moving image stream data, is output using the character code that is uniquely assigned to each character. A subtitle sentence data conversion method in an information processing apparatus having a function of converting to subtitle sentence data of a second format for specifying a font,
An external character font generation step of generating an external character font from the bitmap data included in the caption text data of the first format;
A character code setting step for setting a character code for the external character font generated by the external character font generation step;
A conversion data storage step for storing conversion data indicating a correspondence relationship between the external font generated by the external font generation step and the character code set by the character code setting step;
In the first form subtitle sentence data, a font that is generated by replacing a portion where dynamic definition and designation of an external character font by the bitmap data is made with the character code set by the character code setting step is designated. A subtitle sentence data conversion step for converting the subtitle sentence data in the first format into the subtitle sentence data in the second format;
The subtitle sentence data conversion method characterized by comprising. The conversion data storage step includes: bitmap data included in the caption text data in the first format; an identification code for recognizing the bitmap data; the external font generated by the external font generation step; In association with the character code set in the character code setting step, further stored as the conversion data,
When the bitmap data set included in the caption text data in the first format is input, it is checked whether or not the identification code attached to the bitmap data is stored in the converted data storage step. If there is no bitmap data exceeding a predetermined reference value, the similarity between all the bitmap data stored by the converted data storage step is checked. The method further comprises a control step for causing the external character font generation step, the character code setting step, and the conversion data storage step to execute generation of an external character font, setting of the character code, and storage of the conversion data. Item 10. The caption text data conversion method according to Item 9. The converted data storage step further stores, as the converted data, a program parameter including at least an identifier of a broadcasting station that broadcasts the moving image data.
In the control step, when the bitmap data included in the caption text data in the first format is input, if the identification code attached to the bitmap data is not stored in the converted data storage step, the program Using parameters, narrow down the target for examining similarity from all the bitmap data stored by the conversion data storage step, or determine the order of examining similarity
11. The caption text data conversion method according to claim 10, wherein:   In the subtitle sentence data conversion step, when the external character font cannot be generated by the external character font generation step with respect to the bitmap data included in the first form subtitle sentence data, the subtitle sentence of the first format 10. The subtitle sentence data conversion method according to claim 9, wherein a character code of a specific symbol is arranged at a location where an external font is dynamically defined and designated by the bitmap data in the data.

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