| As everyone knows, video information costs most storage resource in displaysystem. One VCD needs600M while DVD disc needs4~5G. In recent2years, blue rayDVD whose capacity is tens of common DVD becomes the design target of manycompanies. With the rapid development of discs, players have to catch up with the trend.Under this condition, the companies who design DVD, blue ray DVD player face moreand more complicated challenges.In multi-media hardware system (video process system in DVD and cellphone),DRAM (most commonly used storage device in multi-media process system) size andbus bandwith are the most important resources in a system. Bus bandwidth is fixedunder certain clock frequency, so that if one IP costs less bandwith, the saved bandwithcould be used to implement more competitive functions to fulfill costumer’s demands.Therefore, it costs much effort to reduce these2kinds of resource usage in many SOCs.This article is committed to find out a compression methodology withhigh-fidelity which is easy to be implemented to reduce data storage and bus bandwidth.With information got from teaching materials and surfs, it’s known thatcompression with fixed compression rate has more advantages than non-fixed. There arealready lots of compression algorithms used for different system but neither commonstandard nor publicated method are used in the international arena for fixed compressionratio methodology. So that, fixed ratio based on block truncation coding is the target inthis research. Additionally, we focus on absolute moment block truncation coding withcompress ratio2:1which is implemented with Matlab and evaluated by PSNR andvisual result. What’s more, Huffman coding and adaptive low pass filter is also used toenhance the compression result.By simulating with Matlab and comparing PSNR result after simulating viarouspictures and video sequences, a methodology with maximum usage of bit stream andbest visual result based on absolute moment block truncation coding and Huffmancoding is recomeneded. |
