Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2007-12-25
2007-12-25
Vo, Tung (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
10299174
ABSTRACT:
When repeatedly performing compression and encoding of video data, automatically detecting a previous picture type at an encoder side and performing the compression and encoding by matching GOP phases.A motion compensation unit240to a DCT unit244perform motion compensation, DCT, etc. on input video data to generate DCT coefficients. A back search unit248detects whether or not there is a relative minimum in the sum of remainders of the results of division by the quantization steps of the DCT coefficients, judges that the picture having the relative minimum has been compressed and encoded to an intra-picture in the previous compression and encoding, and judges the structure of the GOPs (a number N of pictures and an interval M of P pictures) at the previous compression and encoding. A picture type control unit250controls a picture rearrangement unit200based on the judged GOP structure to make it rearrange pictures of the input video data to an order by which a compression and encoding unit20can perform compression and encoding with the same GOP phase as that of the previous time.
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Frommer William S.
Frommer & Lawrence & Haug LLP
Levy Paul A.
Sony Corporation
Vo Tung
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