Apparatus and method for adaptively compressing successive blocks of digital video
DCFirst Claim
1. Apparatus for processing digitized interlaced video signals for transmission in a compressed form comprising:
- first means for compressing a set of pixel data presented in a field format to provide a first compressed video signal;
second means for compressing said set of pixel data presented in a frame format to provide a second compressed video signal;
means coupled to said first means for evaluating errors in the first compressed video signal and coupled to said second means for evaluating errors in the second compressed video signal; and
means responsive to said error evaluating means for selecting the compressed video signal having the least error.
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Abstract
The compression of successive blocks of digital data is optimized by selecting between different compression algorithms or different data formats on a block-by-block basis. In one application, digitized interlaced video signals are processed for transmission in a compressed form. A set of pixel data presented in a field format is compressed to provide a first compressed video signal. The set of pixel data is also presented in a frame format and compressed to provide a second compressed video signal. Errors are evaluated in the first and second compressed video signals. The compressed video signal having the least error is selected for further processing. The technique is repeated for successive sets of pixel data and the selected signals are encoded to identify them as field formatted or frame formatted signals. The encoded selected signals are then combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
567 Citations
33 Claims
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1. Apparatus for processing digitized interlaced video signals for transmission in a compressed form comprising:
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first means for compressing a set of pixel data presented in a field format to provide a first compressed video signal; second means for compressing said set of pixel data presented in a frame format to provide a second compressed video signal; means coupled to said first means for evaluating errors in the first compressed video signal and coupled to said second means for evaluating errors in the second compressed video signal; and means responsive to said error evaluating means for selecting the compressed video signal having the least error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. Apparatus for optimizing the compression of successive blocks of digital data comprising:
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means for compressing data blocks in a first data path to provide a first compressed signal; means for compressing said data blocks in a second data path to provide a second compressed signal; means for evaluating errors in the first and second compressed signals; means responsive to said evaluating means for selecting the compressed signal having the least error for each data block; and means for combining the selected signals to provide a compressed digital data stream. - View Dependent Claims (17, 18, 19, 20)
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21. Decoder apparatus comprising:
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means for receiving compressed digital video signals transmitted in blocks of frame processed pixel data and field processed pixel data; means coupled to said receiving means for determining whether a particular block of data contained in a received signal was frame processed or field processed; first means for decoding received blocks of field processed pixel data; second means for decoding received blocks of frame processed pixel data; and means responsive to said determining means for selectively combining decoded blocks from said first and second means to recover an uncompressed video signal. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A digital television system comprising:
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first data compression means for compressing field formatted blocks of pixel data derived from a digitized interlaced video signal; second data compression means for compressing frame formatted blocks of pixel data corresponding to said field formatted blocks; means for evaluating errors in compressed data from said first and second data compression means; means responsive to said error evaluating means for selecting the compressed data for each block having the least error; means for encoding the selected data for each block to identify it as field processed or frame processed data; and means for combining the encoded selected data to provide a compressed video data stream containing interspersed blocks of field processed pixel data and frame processed pixel data for transmission by a transmitter. - View Dependent Claims (28, 29)
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30. A method for encoding television signals for digital transmission comprising the steps of:
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dividing a digitized interlaced video signal into blocks of pixel data; formatting said blocks in a field format; compressing said field formatted blocks to provide a first compressed video signal; formatting said blocks in a frame format; compressing said frame formatted blocks to provide a second compressed video signal; evaluating errors in said first and second compressed video signals; selecting, for each block, the compressed video signal having the least error; encoding the selected signals to identify them as field formatted or frame formatted signals; and combining the encoded signals. - View Dependent Claims (31, 32, 33)
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Specification