Video signal decompression apparatus for independently compressed even and odd field data
First Claim
1. Apparatus for receiving and decompressing compressed image data of the type wherein odd and even fields of image data are independently compressed according to respective sequences of interframe and intraframe encoding modes, said apparatus comprising means for independently decompressing said compressed odd and even fields of image data;
- and means for substituting odd field data for even field data when valid even field data is not available.
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Accused Products
Abstract
In a video decompression system for decompressing compressed image data wherein odd and even fields of video signal are independently compressed in sequences of intraframe and interframe compression modes and interleaved for transmission, the odd and even fields are independently decompressed. During intervals when valid decompressed odd/even field data is not available, even/odd field data is substituted for the unavailable odd/even field data. Independently decompressing the even and odd fields of data and substituting the opposite field of data for unavailable data may be used to advantage to reduce image display latency during system start-up and channel changes.
194 Citations
9 Claims
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1. Apparatus for receiving and decompressing compressed image data of the type wherein odd and even fields of image data are independently compressed according to respective sequences of interframe and intraframe encoding modes, said apparatus comprising means for independently decompressing said compressed odd and even fields of image data;
- and means for substituting odd field data for even field data when valid even field data is not available.
- View Dependent Claims (2, 3, 4)
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5. Apparatus for decompressing transmitted compressed image data of the type wherein odd and even fields of image data are independently compressed according to respective sequences of interframe and intraframe encoding modes, said apparatus having a start-up mode and a steady state mode, said apparatus comprising:
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means for detecting said transmitted compressed image data; means, responsive to detected compressed image data, for generating indicia indicating whether fields of compressed image data are odd or even and intraframe encoded or interframe encoded; means, responsive to detected compressed image data, for mutually independently decompressing sequences of odd field compressed image data and sequences of even field compressed image data; means, responsive to said indicia and decompressed odd and even field image data, for composing an image representative signal of decompressed odd and even field image data in said steady state mode, and in the start-up mode composing an image representative signal, for a predetermined interval, of decompressed image data from fields of only one of decompressed odd fields or even fields of data, said one of decompressed odd fields or even fields of data being the odd or even fields of data corresponding to the sequence of interframe and intraframe encoded compressed image data having the first received intraframe encoded field of compressed image data. - View Dependent Claims (6, 7, 8, 9)
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Specification