Abstract:

In order to dynamically analyze the endtoend distortion, a new joint sourcechannel ratedistortion (RD) model for wireless lowbitrate video transmission is proposed. The source and the channel distortions of I and P frames are respectively analyzed on a group of picture (GOP)，and the propagation of distortion within the GOP is discussed. It can dynamically estimate the average endtoend distortion of each frame in the GOP according to packet loss rate and characteristics of the video sequence. Experiments show that the accuracy of this model is satisfactory.

Key words: group of picture analysis, source distortion, channel distortion, joint ratedistortion model, quantization parameter