Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2006-12-19
2006-12-19
Philippe, Gims (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240020
Reexamination Certificate
active
07151799
ABSTRACT:
Provided is a transcoder for coded video the encoding mode of that is changed according to the coded data, itself, that has been compressed by transcoding, or information prepared by decoding only a part thereof. A coded data extractor partially decodes DV coded data (a) that has been input, and sends DCT coefficients (b) to an approximate image generator and to a decoder, and outputs quantization parameters (c) to a first motion vector detector. The approximate image generator generates an approximate image according to a part of the DCT coefficients (b). A first motion vector detector roughly detects motion vector candidates (e). A second motion vector detector, using the motion vector candidates (e) as an initial position, hierarchically detects a motion vector (f). A re-encoder encodes the data into one the encoding mode of that is new, according to a luminance signal (h) that has been decoded in the decoder, the chrominance signal (j) the data format of that has been transcoded in a sampling format transcoder, and the motion vector (f) that has been detected in the second motion vector detector.
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Japanese Office Action dated Jul. 12, 2006, issued in corresponding Japanese Application No. 2002-070878.
Kato Haruhisa
Nakajima Yasuyuki
KDDI Corporation
Philippe Gims
Westerman, Hattori, Daniels & Adrian , LLP.
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