Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2005-05-17
2005-05-17
Lee, Richard (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
06895049
ABSTRACT:
A method of detecting I-frames in a video signal which has previously been MPEG coded, involves taking a DCT and analyzing the frequency of zero value coefficients. An I-frame, which does not utilize prediction coding is expected to have a higher number of zero coefficients than a predicted P- or B-frame.
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Murata et al; “Fast 2D IDCT Implementation with Multimedia Instructions for a Software MPEG2 Decoder”, Proceedings of the 1998 IEEE Int. Conf. on Acoustics, Speech and Signal Processing, vol. 5, May 12, 1998, pp. 3105-3108.
Knee Michael James
Poole Ian James
Lee Richard
Michael & Best & Friedrich LLP
Snell & Wilcox Limited
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