AVS解码器环路滤波的优化及实现

摘要

AVS编解码器采用环路滤波去除块效应来提高图像质量,而环路滤波复杂度高、运算量大,且滤波过程数据访问频繁,严重影响了代码的执行效率.为提高解码速率,通过分析滤波算法特点,调整滤波结构,优化滤波算法,部分代码采用DSP汇编语言.结果表明与传统的C相比,缩短了代码运行时间,提高了执行速度,达到实时解码的要求.%The loop filter is used to remove the blocking effect to enhance image quality in the AVS codec. The loop filter has the disadvantage of high complexity and large computation. And it frequently accesses to data so that seriously affect the efficiency of the implementation of the code. For improving the rate of the decoded video image,this paper adopted analyzing the characteristics of the filter algorithm to adjust the filter structure and optimize the filter algorithm,in which parts of the codes are compiled by DSP assembly language. The results show that the method compared with traditional C code is effective,shorten the running time and improved speed of the code execution,reaches the requirement of real-time decoding finally.