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US 5,185,819 AGranted
Video signal compression apparatus for independently compressing odd and even fields
AssigneeGeneral Electric Company
InventorsSheau-Bau Ng, Rajesh Hingorani
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Abstract
In a video compression system odd and even fields of video signal are independently compressed in sequences of intraframe and interframe compression modes. The odd and even fields of independently compressed data are interleaved for transmission. The fields are interleaved such that intraframe even field compressed data occurs midway between successive fields of intraframe odd field compressed data. The interleaved sequence provides receivers with twice the number of entry points into the signal for decoding without increasing the amount of data transmitted.
Claims7
A system for compressing video data comprising:
- a source of video signal for providing a sequence of ordinally numbered fields of video signal, successive pairs of odd and even numbered fields forming frames of video signal;
- compression means, responsive to said video signal, for compressing odd numbered fields of said video signal independent of said even fields, and for compressing even numbered fields of said video signal independent of said odd fields, said compression means encoding ones of said odd fields according to an intraframe compression mode and others of said odd fields according to a predictive compression mode, and encoding ones of said even fields according to an intraframe compression mode and others of said even fields according to a predictive compression mode, and wherein said even fields compressed according to said intrafield compression mode are from different frames than said odd fields compressed according to said intraframe compression mode;
- and
- means for transmitting the said compressed fields.
1 more element
Dependencies are inferred from the claim text.