Device and method for detecting motion vector, device and method for encoding moving image, and device and method for decoding moving image

Abstract

A device for detecting a motion vector which acquires information on the motion vector with a plurality of partitions of different sizes and rectangular shapes as a unit for each block of a predetermined size in which one screen is divided, the sizes of the blocks being the upper limit, comprises a partition combining means (23) for, if motion vectors for one of the blocks can be obtained in the plurality of partitions, determining whether or not to combine the plurality of partitions in which the motion vectors have been obtained and, when combining the plurality of partitions, including information on the motion vectors of the partitions after combination in information on a motion vector outputted from the device. The code amount associated with the motion vector can be suppressed.

Description

technical field [0001] The present invention relates to a motion vector detection device and method, a moving picture encoding device and method, and a moving picture decoding device and method, and can be applied to moving picture encoding and decoding in accordance with the H.264 / AVC standard, for example. Background technique [0002] In most moving image coding methods including the H.264 / AVC standard, one image (one frame) is divided into multiple blocks, and the motion relative to the encoded image is predicted on a block-by-block basis. motion compensation. The smaller the block size of the motion compensation, the finer the prediction can be performed, but since it is necessary to encode the motion vector information for each block, the code amount increases. [0003] Therefore, in the H.264 / AVC standard, a strategy of switching from several motion compensation block sizes (hereinafter referred to as partitions) to select the optimal block size (motion compensation ...

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Problems solved by technology

[0005] However, in H.264 / AVC standard variable block size motion compensation, when the partition and motion vector of the optimal size are obtained, the motion vector information of the partition is encoded, even if there is a nearby motion that can be regarded as the same The partitions involved in the vector must also encode the motion vector information for each partition, so there is a limitation in the reduction of the code amount

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