【作者】 刘健；

【导师】 曹宁；

【作者基本信息】 河海大学 ， 通信与信息系统， 2002， 硕士

【摘要】 在低速信道上实现动态视频编码技术是目前视频处理领域的一个研究热点。在诸多视频编码实现方法中，除了已广泛应用的纯软件方法外，基于DSP芯片的方法也具有显著的优势。视频压缩编码本质是数字信号处理，DSP芯片比通用CPU更适合做数字信号处理，因此将DSP芯片用于视频编码具有内在的优势。本文首先介绍了视频图像编码原理、H．263建议和基于DSP芯片的实时信号处理系统。然后遵循DSP系统的开发流程，设计开发了一个基于DSP芯片的H．263实时视频压缩编码系统。该系统硬件设计选择了brooktree 公司的Bt819A芯片为前端视频采集A/D芯片，TI公司的TMS320C5402芯片为H．263算法核心芯片。该系统软件设计实现了H．263核心算法模块：DCT、IDCT和运动估计模块，并针对运动估计模块中存在的大量无效运算，提出了运动估计SAD计算最佳退出算法，取得了良好的效果。更多还原

【Abstract】 Video coding realization in narrowband channel is a hotspot in video processing field. Among many methods that realize video coding, the method based on DSP chip also bears remarkable advantage besides pure software method which is used widely. The essence of video coding is digital signal processing, and DSP chip is more suitable for digital signal processing than general CPU. Thus, there will be of great benefit to employ DSP chip to video coding. In this paper, the principle of video coding, the recommendation H.263 and the real-time signal processing system based on DSP chip are introduced first. A H.263 real-time video coding system based on DSP chip is then designed which follows the develop flow of a DSP system. The Bt819A of brooktree corp. is selected for front-end video A/D transforming and the TMS320C5402 of TI corp. is selected for H.263 core algorithm processing in the system hardware design. In the system software design, H.263 core algorithm modules-DCT,IDCT, motion estimation-are realized. An algorithm-the optimal quitting from the SAD calculation algorithm is proposed and achieves satisfactory result which aims at the mass operation of no effect in the motion estimation module.更多还原