MOVING IMAGE ENCODER AND MOVING IMAGE DECODER

摘要

The encoding efficiency when a plurality of reference blocks are used to generate prediction blocks for encoding is improved. A moving image encoder performs inter-picture predictive encoding to encode a difference value from a block to be encoded by generating a prediction image of the block to be encoded by using a plurality of reference images extracted from an encoded frame. The moving image encoder comprises a prediction method candidate generating portion 120, a prediction image generating portion and a variable-length encoding portion 108. The prediction method candidate generating portion 120 generates candidates of a prediction method based on predetermined information related to the block to be encoded, and the prediction image generating portion generates the prediction image of the block to be encoded based on the generated candidates of the prediction method. The variable-length encoding portion 108 encodes the prediction method used for generating the prediction image when the inter-picture predictive encoding is performed by using the generated prediction image if the number of the candidates of the prediction method generated by the prediction method candidate generating portion 120 is two or more.