Verfahren zur Kodierung/Dekodierung von Bildern

摘要

An encoding method of a GBTC type that encoded data and decoded data have a fixed length, which can reduce the degree of deterioration of the quality of a reproduced image and also to provide an encoding/decoding method which, in encoding or decoding, is capable of performing editing processings to rotate an original image in 90 DEG and to rotate it inversely with respect to up and down, right and left. When encoded data in each of blocks of an original image and level specification signals phi ij of respective pixels in each block are written into a memory or are read out therefrom, the fractions of parameter values are rounded to the nearest whole number or cut away to thereby put operation values into integral numbers, or the encoded data and the pixel level specification signal are arranged in such a manner that they can be rotated or inversely rotated an integral number of times 90 DEG . <IMAGE>