Image analysis – Image compression or coding – Including details of decompression
Reexamination Certificate
2011-04-19
2011-04-19
Tran, Phuoc (Department: 2624)
Image analysis
Image compression or coding
Including details of decompression
C382S245000
Reexamination Certificate
active
07929790
ABSTRACT:
Subtitling aims at the presentation of text information and graphical data, encoded as pixel bitmaps. The size of subtitle bitmaps may exceed video frame dimensions, so that only portions are displayed at a time. The bitmaps are a separate layer lying above the video, e.g. for synchronized video subtitles, animations and navigation menus, and therefore contain many transparent pixels. An advanced adaptation for bitmap encoding for HDTV, e.g. 1920.times.1280 pixels per frame as defined for the Blu-ray Disc Prerecorded format, providing optimized compression results for such subtitling bitmaps, is achieved by a four-stage run length encoding. Shorter or longer sequences of pixels of a preferred color, e.g. transparent, are encoded using the second or third shortest code words, while single pixels of different color are encoded using the shortest code words, and sequences of pixels of equal color use the third or fourth shortest code words.
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Gandolph Dirk
Horentrup Jobst
Kochale Axel
Ostermann Ralf
Peters Hartmut
Eriksen Guy H.
Kiel Paul P.
Shedd Robert D.
Thomson Licensing
Tran Phuoc
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