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    • 6. 发明申请
    • METHOD AND APPARATUS FOR CODING/DECODING ITEMS OF SUBTITLING DATA
    • 用于对数据进行编码/解码的方法和装置
    • WO2004047431A1
    • 2004-06-03
    • PCT/EP2003/012368
    • 2003-11-06
    • THOMSON LICENSING S.A.SCHILLER, HaraldADOLPH, DirkHÖRENTRUP, JobstOSTERMANN, RalfPETERS, Hartmut
    • SCHILLER, HaraldADOLPH, DirkHÖRENTRUP, JobstOSTERMANN, RalfPETERS, Hartmut
    • H04N5/445
    • H04N5/44504H04N7/0885H04N19/94H04N21/42653H04N21/4884
    • 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 mem-ory 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.
    • 字幕可以基于像素数据或字符数据。 字符数据允许非常有效的编码,但是从单独的字符串中,字幕不能被转换为图形表示以覆盖在视频上。 预期的字符集,字体和例如 字体大小必须在字幕比特流内显式编码,或者必须对其进行隐含的假设。 在基于像素的字幕中,字幕的形式直接以图形表示的方式传送,因为在AV屏幕上以像素值为代表(通常为矩形)的区域,以字幕数据显着增加的带宽为代价。 根据本发明,使用一种允许有效实现基于像素的字幕字体的字体存储器,因为字形仅需要被发送一次,此后在AV事件期间由相对紧凑的字符引用引用。 因此,本发明结合了基于纯像素和纯字符的字幕方案的优点,同时主要避免了它们各自的缺点。