Image coding and decoding apparatus

摘要

Each of an image coding apparatus and an image decoding apparatus uses a motion compensated prediction using virtual samples so as to detect a motion vector for each of regions of each frame of an input signal. Accuracy of virtual samples is locally determined while the accuracy of virtual samples is associated with the size of each region which is a motion vector detection unit in which a motion vector is detected. Virtual samples having half-pixel accuracy are used for motion vector detection unit regions having a smaller size 8×8 MC, such as blocks of 8x4 size, blocks of 4x8 size, and blocks of 4×4 size, and virtual samples having 1/4-pixel accuracy are used for motion vector detection unit regions that are equal to or larger than 8x8 MC in size. As a result, in each of 8×4, 4x8, and 4x4 MC modes, the memory bandwidth required for generating virtual samples can be reduced and both the image coding apparatus and the image decoding apparatus can be simplified.