H.263视频编码中图像头标保护方法的研究

Study on Video Image Head Tag Protection in H.263

在H.263视频编码中,虽然图像头标只占视频数据流中极少的一部分,但其一旦丢失或出现错误,将给解码图像质量造成严重的影响,甚至不能解码,因此应当对其进行保护。该文对几种基于H.263句法结构的图像头标保护方法进行了分析研究,指出了它的优缺点。在此基础上,提出了一种改进的图像头标保护方法,给出了图像头标保护前后的出错概率分析,在信道出错概率为10-5时,图像头标出错概率由保护前的2.7×10-4降至8.1×10-9,并且不会造成编解码端的时间延迟。

In H.263video coding,The decoding image quality can be degraded su bstantially by image head tag loss or errors,So it should be protected.Several image head tag protection methods based on H.263syntax,including its advan tages and disadvantages,have been studied in this paper.A new improved image h ead tag protection method is proposed based on above study.This method can redu ces image head tag error probability from2.7×10-4 before protection to8.1×10-9 after protection,which the communication channel error probability is10-5 ,and there is no time delay in decoding.