| 摘要 |
A frame of a video signal, wherein the frame is divided into non-overlapping blocks of MxN pixels, M and N being positive integers, respectively, is encoded by: arranging the blocks into groups of PxQ blocks, P and Q being positive integers, respectively; transforming each of the PxQ blocks in a group into a set of MxN transform coefficients to thereby provide PxQ sets of MxN transform coefficients for the group, the transform coefficients in each set representing different frequency components, respectively; quantizing the sets of transform coefficients into PxQ sets of MxN quantized transform coefficients; DPCM(differential pulse code modulation) coding the sets of quantized transform coefficients to provide PxQ sets of DPCM coefficients, wherein one set of DPCM coefficients is identical to one of the sets of quantized transform coefficients and each of the DPCM coefficients included in the remaining sets represents a difference between two quantized transform coefficients of an identical frequency component; and setting the PxQ sets of DPCM coefficients as encoded data for the group of PxQ blocks.
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