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Caption data coding/decoding method and device

A technology of subtitles and data, applied in digital recording/reproduction, parts of color TV, parts of TV system, etc., can solve problems such as difficulty in high-speed conversion and superimposition of subtitles

Inactive Publication Date: 2004-10-06
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] When using hexadecimal representation for each pixel in CD-G, it takes about four times as long to change subtitle data display compared to when using binary representation
This time delay makes it difficult to display superimposed subtitles at high speed when expressed in hexadecimal

Method used

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  • Caption data coding/decoding method and device
  • Caption data coding/decoding method and device
  • Caption data coding/decoding method and device

Examples

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Embodiment Construction

[0069] FIG. 1 shows a block diagram of an embodiment of a data decoding device for implementing a method for decoding superimposed subtitle data according to the present invention.

[0070] In FIG. 1, a reproduced signal such as a multiplexed signal read from a data recording medium (such as a disc) through a slave system (not shown) is input to a data decoder and demultiplexer 1. . An error correcting code (ECC) is decoded to correct errors, and the input multiplex data is separated to form video data, subtitle data and audio data in a data decoder and demultiplexer. The video data is supplied to the video decoder 3, the subtitle data is supplied to the decoder 7, and the audio data is supplied to the audio decoder 11.

[0071] The memory 2 is used as a buffer memory, work area or the like to perform such processing in the data decoder and demultiplexer.

[0072] The video decoder decodes the bit stream of the input video data by using the memory 4 and supplies the decoded ...

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Abstract

A subtitle data encoding apparatus, which is used in a video image transmission system, creates loading blocks (70) from relative position information by sampling an input bit stream at a frame interval. The loading block corresponds to a pixel data block and contains changeover position information which updates a change position, delays the update operation and sets the length of the delay. The address used to access a color lookup table (71) for displaying subtitle data is changeable at the change position to access different display data stored therein. The pixel data block is encoded from subtitle data and the loading blocks and pixel data blocks are combined for transmission. The changeover position information can also be used to progress a color-wipe operation.

Description

[0001] This application is a divisional application of the following patent application: the filing date is March 23, 1996, the application number is 96105775.0, and the title of the invention is "Method and Device for Caption Data Encoding / Decoding". technical field [0002] The invention relates to a superimposed subtitle encoding / decoding method and device. The present invention allows for variations in the display of subtitle data superimposed on video images. Background technique [0003] Superimposed subtitles are usually displayed at the bottom of the display screen when viewers watch foreign movies. In video discs or regular television broadcasts, subtitles are superimposed on the television picture before being recorded or broadcast. [0004] In another system, such as the "CAPTAIN" system, superimposed subtitles are transmitted in the form of character codes or dot patterns. [0005] In CD-G (Graphics), graphics can be recorded using subcodes. These subcodes can...

Claims

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Application Information

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IPC IPC(8): G09G5/00G09G5/06G10K15/04H04N5/445H04N5/92H04N7/088H04N9/804H04N9/806H04N9/82
CPCH04N9/8244H04N7/007H04N5/9208H04N7/0885H04N9/8063H04N9/8227H04N21/4884H04N9/8205H04N5/44513H04N9/8042H04N21/47G11B20/10
Inventor 塚越郁夫
Owner SONY CORP
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