基于DSP的AVS视频编码算法优化与实现(3)
时间:2025-01-20
时间:2025-01-20
AVS
华北电力大学硕+学位论文摘要
摘要
AVS是我国具备自主知识产权的第二代信源编码标准。它的编码效率及竞争性与国际标准MPEG一4/H.264相当,广泛应用于广播、通信、电视、娱乐等各个领域。本文研究了AVS视频压缩标准,分析了TMS320DM6437DSP的结构特点,从内存分配及CACHE优化、算法及代码优化四个方面进行了优化。实现了DSP的浮点除法运算,应用了改进的小菱形算法和帧问模式快速选择算法等优化方法,结合EDMA和软件流水线技术的使用,使AVS编码在TMs320DM6437DSP上码率大大提高。实验结果表明,该方法在保证图像失真度和码率性能的前提下,编码速率从O.40fps提高到14.30fps,视频编码器在性能和效率方面都得到了很大的改进。
关键词:AvS,DSP,算法优化,视频编码
ABSTRACT
AVSisthesecondgenerationsourcecodingstandardwithindependentintellectualpropertyofourowncountry.HaVingthesamecodinge佑ciencyastheintematioanlstandardofMPEG一4/H.264,AVShasbeenwidelyusedinVariousoffieldssuchasbroadcasting,communication,teleVisionandentertainment.ThispaperstudiesVideocompressionstandard,analyzesthestructurecharacteristicsofTMS320DM6437DSPandmakessomeimproVementonmemorydistribution,CACHEoptimization,algrorithmandcodeoptimizaionbasedonvideocompressionstandardandthestnJctureofTMS320DM6437DSP.Thefloating—pointdiVisionoperationofDSPhasrea“zedandtheoptimizationmethodofsmalldiamondalgo“thmandfastintermodeIdecisionarepresented,whichhasgreatlyincreasedthecodingspeedonTMS320DM6437DSPusingAVSwiththeuseofEDMAandsoftwarepipelining.TheexperimentshowsthattheVideoencoderhasbeengreatlyinlproVedonperflonnanceandemciencyinthatthecodingratehasbeenincreasedfromO.40fpstol4.30fpswiththesameimagedistortionandcodingperfbmance.
JinXiaopeng(CommunicationandInformationSystem)
Directedbyprof.ZhangShu-e
KEYWORDS:AVS,DSP’Alogrithmoptimization,VideoCoding