IMAGE DECODING APPARATUS IMAGE ENCODING APPARATUS IMAGE DECODING METHOD IMAGE ENCODING METHOD AND RECORDING MEDIUM FOR RECORDING DATA STRUCTURE OF ENCODED DATA

摘要

When the intra prediction parameter indicates the horizontal direction prediction processing, the luminance value of the pixel adjacent to the upper side of the block with respect to the luminance value of the pixel adjacent to the left of each block serving as the unit of prediction processing of the encoding block A value proportional to the change amount is added to the predicted value of the predictive image, and when the intra prediction parameter indicates the vertical direction prediction processing, the luminance value of the pixel adjacent to the upper side of the block is added to the left side of the block A value proportional to the luminance value change amount in the vertical direction of the pixel adjacent to the pixel is added, and the added value is used as the predicted value of the predicted image.