Efficient image signal coding system.

摘要

An image signal coding system comprising: blocking means (2) for dividing input signals representing sampled values into a plurality of blocks; orthogonal transformation means (3) for performing an orthogonal transformation on the output signals of said blocking means representing each block, dividing the results of the orthogonal transformation into a mean component and variation components and outputting the mean component and the variation components; first normalising means (4) for effecting interblock normalisation of the mean component and the variation components of the output of said orthogonal transformation means; and second normalising means (7) for normalising variation components of output signals of said first normalising means (4) in each of the blocks.