Method and apparatus for producing pseudo-constant bits per...

Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal

Reexamination Certificate

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C375S240120, C375S240130

Reexamination Certificate

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06914939

ABSTRACT:
A frequency domain data management technique for producing pseudo-constant bits per picture compressed video bit-streams in a low delay digital encoding environment is presented. This technique forms a hierarchy among the localized samples of the picture in terms of frequency importance and the picture difficulty after a shot-change is detected. After a shot change, the data management technique implements a series of tasks composed of picture difficulty evaluation, frequency classification, frequency constraining, and zero bytes generation to achieve a pre-determined average picture bits. Further, the low delay encoder uses a unique updating mechanism to encode certain regions of the pictures in intra mode and ensures that the whole picture is updated after a pre-selected number of pictures. The updating method disseminates compression artifacts throughout the video stream by changing the orientation of the intra-coded regions for every picture and scatters intra-picture compression artifacts by spatially decimating the aforementioned regions at different rates.

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“DCT Interpolation for Motion Video”, disclosed anonymously 322103, reproduced from Research Disclosure, Feb. 1991, No. 322, copyright Kenneth Mason Publications, Ltd., England.

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