Patent ID: 9596476
Date: 2017-03-14
CPC Classifications: G06T,H04N

Claim:
1. An image decoding apparatus that performs an orthogonal transform on prediction error data of each transform block, and decodes image data from an encoded bit stream generated by processing coefficient data subjected to the orthogonal transform, the prediction error data being a difference between the image data and predicted image data, the image decoding apparatus comprising: memory; and processing circuitry configured to process the encoded bit stream to obtain the coefficient data subjected to the orthogonal transform and encoding parameter information; determine an inverse orthogonal transform procedure based on a size of a transform block and a prediction mode; perform the determined inverse orthogonal transform procedure on the coefficient data by using a base to obtain the prediction error data, the base being set in accordance with a location of the transform block in a macroblock indicated by the encoding parameter information; generate the predicted image data; and add the predicted image data to the obtained prediction error data, to decode the image data.