H.263 Video Coding Standard On C6201 Dsps With The Realization

With the development of multimedia communication,digital video coding has become more important. The video communication system,encoded compliant with H.263 recommendation,will play an important roll in our daily life and have high practical value certainly.The thesis aims at efficient implementation of H.263 encoder on TI's TMS320C6201 DSPs,that is,increasing frame rate as more as possible. The primary work is as follows:Firstly we lucubrate H.263 recommendation,and analyze the computation and memory of each subproject.Secondly we analyze the process of motion estimation and compensation. We use nearest-neighbors search (NNS) algorithm,instead of full search algorithm,to reduce search times with little degradation. We use SAD as block match function,due to the appropriate computation and easy hardware implementation.Thirdly DCT is implemented using Chen fast DCT algorithm. We transform float-point arithmetic into fixed-point arithmetic,which meeting the precision requirements of the IEEE 1180 standard,to accord with fixed-point C6201 DSPs.Fourthly we reform the construction of Huffman lookup tables to reduce memory occupancy.The computationally complex operations such as DCT,SAD,and interpolation are written in assembly language. Memory access to external memory is a significant bottleneck in the implementation of real-time embedded video systems that have large memory requirements. We place the code for computationally intensive routine and frequently used code and data into on-chip memory.The general work of this thesis is summari ed and the farther research direction is pointed out in the end.