关键词: 固定背景视频，压缩，JPEG，离散余弦变换，嫡编码，FPGA

Abstract: In order to achieve a high compression ratio when compressing videos with fixed background, a new kind of algorithm used on fixed-background video compressing was proposed by improving JPEG still image compression standard. The algorithm separates the JPEG encoding into two parts-lossy procession and lossless procession, reduces compressed data volume by processing XOR operation between frames after lossy procession. The simulation in MATLAB and implementation in FPGA prove that the algorithm can increase the compression ratio effectively, the decomposition will not bring in evident noise, and the algorithm can be implemented in hardware.

Key words: Fixed-background video,Compress,JPEG,DCT,Entropy encoding,FPGA