| 摘要 |
<p>The present invention relates to a method of scanning an image signal depending upon an energy distribution of two-dimensional data which can effectively compress image data by way of a scanning manner determined according to an energy distribution of a transform coefficient of N x N block frequency region. The method comprises scanning image signal transform coefficients of N x N blocks on the basis of the energy distribution pattern, the blocks being defined by transforming image signal input of a time region to signals of a frequency region, compressing and transferring the sanned transform coefficients ; and, restoring the compressed transform coefficient data and rearranging the restored coefficient data into original image data of N x N blocks by scanning them in conforming to the energy distribution pattern. The apparatus comprises an encoder for transforming image signal input of a time region into signals of a frequency region, scanning the transform coefficients of N x N block in accordance with the enregy distribution pattern, and compressing and transferring the scanned transform coefficients, and, a decoder for restoring the compressed data transferred from the encoder and rearranging the transfrom coefficients into original image data of N x N blocks in conforming to the scanning order based to the energy distribution pattern. <IMAGE></p> |
