Image signal encoding apparatus using adaptive 1D/2D DCT compression technique

摘要

An improved image signal encoding apparatus for processing a digitized image signal for transmission thereof in a compressed form, comprising a horizontal one-dimensional compression path for compressing the digitized image signal utilizing a horizontal correlation therein to provide a first compression signal, a vertical one-dimensional compression path for compressing the digitized image signal utilizing a vertical correlation therein to provide a second compression signal, a two-dimensional compression path for compressing the digitized image signal utilizing the horizontal and the vertical correlations to provide a third compression signal; and a comparator for comparing a first compression error contained in the first compression signal, a second compression error contained in the second compression signal and a third compression error contained in the third compression signal so as to enable the selection of the compression signal having the least error.