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Method and apparatus for coding/decoding items of subtitling data

A technology for data items and subtitles, applied in the field of encoding/decoding subtitle data items

Inactive Publication Date: 2006-02-01
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, any subtitles in this scheme are limited to those that can be expressed with the subtitles and symbols of the particular font used

Method used

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  • Method and apparatus for coding/decoding items of subtitling data
  • Method and apparatus for coding/decoding items of subtitling data
  • Method and apparatus for coding/decoding items of subtitling data

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Embodiment Construction

[0042] As shown in Figure 1, font description data 102, and character reference data 103 are transmitted, stored or recorded with associated AV data 101, whereby said transmission or storage can be in an almost inseparable mix and use a completely independent transmission between channels or memory locations.

[0043] On the decoder side, as shown in FIG. 2 , a subtitle stream 201 passes through data separation means 202 , which in turn provide character reference data 203 and font description data 204 . Font description data 204 enables a collection of arbitrary character glyphs or other graphical building blocks to be loaded into font memory 208 by passing through font description data processing means 205 .

[0044] Advantageously, the number and design of character glyphs to be used in each individual use case is entirely under the control of the content provider.

[0045]Optionally, for fonts thus described and loaded into font memory 208, the above-mentioned font identi...

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PUM

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Abstract

Subtitling can be based on either pixel data or on character data. Character data allow very efficient encoding, but from character strings alone, subtitling can not be converted into a graphical representation to be overlaid over video. The intended character set, font and e.g. font size, must either be coded explicitly within the subtitling bitstream or an implicit assumption must be made about them. In pixel-based subtitling, subtitling frames are conveyed directly in the form of graphical representations by describing them as (typically rectangular) regions of pixel values on the AV screen, at the cost of considerably increased bandwidth for the subtitling data. According to the invention, a font memory is used that allows an efficient realisation of pixel-based subtitle lettering, because the glyphs need only be transmitted once and thereafter are referenced by relatively compact character references during the AV event. Thereby the invention combines the advantages of pure pixel-based and pure-character-based subtitling schemes, while mostly avoiding their respective shortcomings.

Description

technical field [0001] The present invention relates to a method and apparatus for encoding / decoding subtitle data items, in particular subtitles and graphics, for optical storage and recording of blue beam discs. Background technique [0002] In the subtitle area for pre-recorded audiovisual (AV) material, there are conflicting requirements: on the one hand, the subtitle data should be efficiently encoded, and in particular, if the entire subtitle service is to be provided to any given AV Material. In this case, at least on average, very few bits are available for each subtitle character. [0003] Professional content owners, on the other hand, want complete control over the on-screen appearance of subtitle characters, and additionally, they want to command them to have a rich set of special display effects, from simple fades to true animations. Such a high degree of design freedom and order is generally only practical for high or very high subtitle bandwidths. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/445H04N7/088
CPCH04N7/0885H04N19/00963H04N5/44504H04N21/4884H04N7/28H04N21/42653H04N19/94H04N21/43
Inventor 哈拉尔德·席勒迪尔克·阿道夫约布斯特·霍伦特鲁普拉尔夫·奥斯特曼哈特穆特·彼得斯
Owner THOMSON LICENSING SA