Patent ID: 7742527

Claim:
A video signal decompression system, comprising; a demultiplexer configured to receive a compressed video signal, the compressed video signal containing variable length coded data representing a set of video spatial frequency coefficients of an individual sub-block using a scanning pattern of a plurality of scanning patterns, the scanning pattern scanning each of a plurality of sub-blocks having n×n coefficients, in the following sequence: M(0,0), M(1,0), M(0,1), M(0,2), M(1,1), M(2,0), M(3,0), M(2,1), M(1,2), . . . , M(n−1,n−1) from lowest frequency to highest frequency to produce a set of reordered coefficients, and containing a scanning mode signal indicating the scanning pattern and configured to extract the variable length coded data and the scanning mode signal from the received signal, the scanning mode signal not being variable length coded, a variable length decoder which variable length decodes the entropy encoded data to produce a variable length decoded data, the scanning apparatus; comprising: a scanning unit which receives the variable length decoded data and returns the set of video spatial frequency coefficients of the individual sub-block to the original order according to the scanning pattern of the plurality of scanning patterns by using the scanning mode signal.