嵌入式MPEG-4视频编码器的研究  

Study on Embedded MPEG-4 Video Encoder

作　　者：李云栋[1] 常青[1] 张其善[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083

出　　处：《计算机工程与应用》2006年第10期100-102,168,共4页Computer Engineering and Applications

摘　　要：论文介绍一种基于嵌入式ARM处理器的MPEG-4视频编码器方案。该方案采用嵌入式Linux操作系统,在FreescaleMXL硬件平台上实现MPEG-4simpleprofile视频编码子集。为提高编码效率,该方案从算法和结构两方面对编码器进行优化。首先利用处理器内嵌的多媒体加速器硬件实现DCT算法,并对运动估计、量化、半像素插值等关键部分进行汇编优化,然后提出一种基于运动矢量分布特征的半像素搜索算法,对半像素运动矢量搜索进行优化。对标准测试序列的试验表明该方案是可行的,对分辨率为QCIF的图像进行编码能够达到20fps以上的帧率。A scheme of MPEG-4 video simple profile encoder is implemented based on Freescale MXL arm processor and embedded linux,To improve efficiency of encoder,optimizations on the structure,as well as on the algorithm,are applied to video encoder.First,the multimedia accelerator of MXL processor is utilized to implement discrete cosine transform,and some critical modules such as motion estimation,quantization and half pixel interpolation are optimized by assemble language.Then a novel fast half-pixel motion vector search algorithm based on motion vector distribution characteristic is proposed.Experiments of test sequences have shown that the scheme can encode QCIF resolution video over 20 frames per-second,

关 键 词：MPEG-4 视频编码 ARM处理器 优化 

分 类 号：TN919.8[电子电信—通信与信息系统]