Patent ID: 9036713
Filing Date: 2015-05-19
Classification: H04N

Abstract:
1. An image decoding device which decodes a predictive-encoded hit stream to acquire a moving image signal, the bit stream being created by dividing each frame of the sieving image signal into a plurality of blocks and by performing a motion prediction for each of the blocks, the image decoding device comprising: a decoding unit for decoding the bit scream to acquire information indicating a size of the block, information indicating a threshold on a block size, a first motion prediction mode for a first motion prediction unit block which corresponds to the block, and for decoding the bit stream to acquire a second motion prediction mode for a second, motion prediction unit block when the first motion prediction mode is not a skip mode and a size of the first motion prediction unit block is larger than the threshold, the second motion prediction unit block being obtained by dividing the first motion prediction unit block hierarchically; and a predicting unit for, when the first motion prediction mode is a skip mode, determining an estimated vector from surrounding motion vectors, and setting the estimated vector as a motion vector for the first motion prediction unit block to create a prediction image, and for, when the second motion prediction mode is a skip mode, determining an estimated, vector from surrounding motion vectors, and setting the estimated rector as a motion vector for the second motion prediction unit block to create a prediction image.