A Distributed Video Coding Method Based on Motion Compensation Refinement

Abstract

The invention relates to a distributed video encoding method based on motion compensation refinement, which comprises the following steps of: (1) dividing a video sequence into a key frame and a WZ (working zone) frame at an encoding end, and then carrying out DCT (discrete cosine transform), quantization and Turbo encoding on the WZ frame; and (2) at a decoding end, adopting H.264 intra-frame decoding for the key frame, generating a forward motion compensation image and a backward motion compensation image by using an improved three-dimensional recurrent motion searching method, and then generating a side information decoding WZ frame by adopting a motion compensation interpolation method. The method has a reasonable design; by adopting the improved three-dimensional recurrent motion searching method (3DRS), the quality of side information (SI) can be effectively improved; simultaneously, the refinement of the SI is achieved by adopting a space-time boundary matching algorithm (STBMA); the more precise motion vector is obtained by adequately utilizing the smoothness of space and time; and the method has better rate distortion performance.

Description

technical field [0001] The invention belongs to the technical field of video compression, in particular to a distributed video coding method based on motion compensation refinement. Background technique [0002] With the rapid development of network technology, wireless technology and computer technology, many multimedia application equipment with new characteristics have emerged recently, such as wireless video sensor monitoring network, mobile camera mobile phone and camcorder, etc. Both capacity and power resources are very limited, requiring simple encoders to save power. [0003] Distributed Video Coding (Distributed Video Coding, DVC) moves time-consuming and power-consuming motion estimation / compensation from the encoding end to the decoding end, and has low encoding complexity similar to traditional intra-frame encoding and much higher than intra-frame encoding. The characteristics of compression performance provide a good solution for the above applications. DVC i...

AI Technical Summary

Problems solved by technology

At present, many algorithms have been proposed to improve the performance of the DVC system: Dong Yoon Kim et al. proposed an algorithm that uses seed blocks to generate side information. When the SI is close to the target image, a better reconstructed image can be obtained at the decoding end, so that Improve the compression ratio; Marco Cagnazzo et al. proposed a novel differential motion estimation algorithm, which can be applied to the decoding end of the WZ video coding scheme without increasing the coding rate; although these algorithms can improve the compression performance of DVC to a certain extent, but , there are still problems such as poor side information quality and low rate-distortion performance

Images