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US 5,475,432 AGranted
Hibrid video signal encoder having a block rearrangement capability for better compressibility
AssigneeDaewoo Electronics Co., Ltd.
InventorHakjae Park
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Abstract
A hybrid coder, for performing interframe video encoding which combines the advantages of both the interfield and the interframe codings for low bit-rate video transmission; the pel elements of a differential block from a subtracter is rearranged; the complexity of a present input block and the horizontal motion vector thereof are estimated; and, then, one of the differential block and the rearranged block is subjected to a two-dimensional transform according to the complexity and the horizontal motion vector.
Claims4
An interframe video encoder for encoding an input block of pel elements from a video frame comprising:
- means for generating a differential block of pel elements by differentially combining the pel elements of the input block with the pel elements of a block from a previous frame, which most closely matches the input block;
- means for generating a rearranged block of pel elements by rearranging the pel elements of the differential block;
- means for generating a control signal based on a complexity of the input block and a horizontal component of a motion vector of the input block, wherein said complexity is determined by obtaining a variance of the input block and wherein said motion vector represents the shift of the input block between the video frame and the previous frame;
- a transformer for transforming either the differential or the rearranged block of pel elements into a block of transform coefficients by using a two-dimensional signal transformation;
- means for connecting either the differential block or the rearranged block to said transforming means in response to the control signal;
- a quantizer for quantizing the block of transform coefficients into a block of quantized transform coefficients;
- means for reconstructing the differential block in response to the control signal;
- means for encoding the quantized transform coefficients for their transmission in a data stream;
- means for deriving said motion vector from the video frame and the previous frame;
- and
- means for combining said motion vector with the data stream.
8 more elements
Dependencies are inferred from the claim text.