Method and system for detecting intra-coded pictures and for...

Details Method and system for detecting intra-coded pictures and for... Method and system for detecting intra-coded pictures and for...

2006-01-24

2006-01-24

Rao, Andy (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240240, C375S240250

Reexamination Certificate

active

06990146

ABSTRACT:
The present invention relates to a method and system for extracting coding parameters from uncoded video data. Encoded video data is decoded using an MPEG decoder to produce decompressed video data. A DC computation operation is performed to recover an intra-dc-precision level from the decompressed video data, such that if the intra-dc-precision level is less than a first predetermined threshold, the decompressed video data is classified as an intra-coded picture. If the intra-dc-precision level is equal to the first predetermined threshold, a discrete cosine transform (DCT) is performed to produce a set of DCT coefficients for at least one AC frequency band in the decompressed video data. Then, an average quantizer step size is computed based on the AC data and if the average quantizer step size is greater than a second predetermined threshold, the decompressed video data being processed is classified as an intra-coded picture. Thereafter, the quantization matrix data of a frame of the decompressed video data is extracted. In addition, a quantizer scale and a DCT type value for each block of the decompressed video data is extracted.

REFERENCES:
patent: 6108448 (2000-08-01), Song et al.
patent: 6327390 (2001-12-01), Sun et al.
patent: 6549245 (2003-04-01), Lee et al.
patent: 6697523 (2004-02-01), Divakaran et al.

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