Patent ID: 9154779
Filing Date: 2015-10-06
Classification: H04N

Abstract:
1. A moving-picture decoding apparatus, comprising: an entropy decoder configured to obtain a prediction mode and transformation coefficients from coded data obtained by coding processes according to prediction directions; an order controller configured to rearrange the transformation coefficients according to a scanning order corresponding to a prediction direction of a target block from among scanning orders predetermined for the prediction directions; a classifying unit configured to classify a mode applied to the target block into a predetermined first mode or a predetermined second mode; a first inverse orthogonal transformer configured to obtain a predictive residual signal by subjecting the rearranged transformation coefficients to an inverse orthogonal transformation by use of a first transformation basis common to the prediction directions if the applied mode is classified into the first mode; a second inverse orthogonal transformer configured to obtain a predictive residual signal by subjecting the rearranged transformation coefficients to the inverse orthogonal transformation by use of a second transformation basis different from the first transformation basis if the applied mode is classified into the second mode; and a generator configured to generate a decoded image signal by use of the predictive residual signal, wherein the order controller rearranges the transformation coefficients according to a scanning order corresponding to a horizontal direction if the prediction direction of the target block is vertical, and rearranges the transformation coefficients according to a scanning order corresponding to a vertical direction if the prediction direction of the target block is horizontal.