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    • 73. 发明公开
    • Method and apparatus for coding/decoding items of subtitling data
    • 与字幕数据元素进行编码的方法和装置/解码
    • EP1420580A1
    • 2004-05-19
    • EP02090382.9
    • 2002-11-18
    • Deutsche Thomson-Brandt GmbH
    • Schiller, HaraldAdolph, DirkHorentrup, 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 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.
    • 字幕可以基于任一像素数据或字符数据。 字符数据允许非常有效的编码,但单从字符串,字幕无法被转换成一个图形表示要被叠加在视频上。 预期的字符集,字型并且例如 字体大小,必须要么内显式的字幕流或隐含的假设,必须对他们进行编码。 在基于像素的字幕,字幕帧被直接在图形表示的形式通过描述它们作为AV画面上的像素值的(通常为矩形)区域,在显着地增加带宽为字幕数据的费用输送。 。根据本发明,一种字体存储器被用来做允许基于像素的字幕刻字的有效实现,这是因为字形仅需要反式mitted一次,之后由AV事件期间相对紧凑字符引用参考。 从而本发明将纯的基于纯字符基于像素和字幕方案的优点,同时大多避免其respectivement短缺憾。