MPEG-2纹理图像的错误检测技术

Error-detection technique of MPEG-2 texture images

基于MPEG-2码流,描述了传送流(TS)和视频流的错误检测方法。这两种错误分别由信道解码器和视频解码器识别,通常检测到的是语法错误,而且由于可变字长码的错误传播影响,检测到的错误位置并非错误的起始位置。因此,基于图像光滑性和一致性的假设,提出了非语法错误的纹理图像的检测算法(如DC系数的错误检测算法)以及确定错误起始位置的方法。实验结果表明,该技术能够应用于MPEG-2解码器的实时处理。

Based on MPEG-2 codestream, the error detection methods for transport stream and video stream are described in the paper. Channel and video decoders , which can not determine the starting position of error because of the effect of error propagation in VLC, can recognize the syntax errors of transport stream and video stream respectively. Based on the assumptions of smoothness and consistency in images, the method to confirm the starting position of error is proposed, and the algorithm to detect the non-syntax errors, such as DC coefficient errors, is also presented. The experimental results show that the proposed techniques are effective, and can apply to real-time processing for MPEG-2 decoder.