TRANSFORMATION METHOD BASED ON DIRECTIVITY OF PREDICTION ERROR, IMAGE-ENCODING METHOD AND IMAGE-DECODING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a moving image-encoding method for which the power concentration of a transformation coefficient is improved by orthogonal transformation, corresponding to the direction of in-screen prediction.;SOLUTION: The moving image-encoding method for encoding input image signals includes: a step of generating predicted error signals (116), indicating the difference value among prediction signals (121), generated according to a predetermined prediction mode and the input image signals (115); an orthogonal transformation step of orthogonally transforming the prediction error signals by a first transformation method, depending on the prediction direction of the prediction mode or a second transformation method which is independent of the prediction direction and generating the transformation coefficients; a quantization step of executing quantization processing on the transformation coefficients and generating quantized transformation coefficients; and an encoding processing step of executing entropy-encoding processing to the quantized transformation coefficient (117) and transformation information (118) indicating whether it is the first transformation method or the second transformation method and generating encoded data (124).;COPYRIGHT: (C)2010,JPO&INPIT