Distortion Estimation Method for Coefficient Dropping of H, 264 Bit-stream

In order to evaluate the effect of dropping parts of coefficients in H.264 bit-stream, the distortion aroused by coefficient dropping has to be estimated accurately. In this paper, an efficient method is presented to estimate the distortion of a frame during the error propagation caused by single frame coefficient dropping of H.264 bit-stream. At first, through analyzing the image reconstruction procedure at decoder, it can be concluded that error propagation is caused by motion compensation and Intra prediction for Interand Intrablock respectively. Then, after the estimation of distortion from the rescaled coefficient to be dropped, we propose a method which considers error propagation synthetically from frame and block two aspects. At frame level, a linear propagation model is introduced to describe the behavior of Inter-propagation. At block level, a method is developed to estimate the propagation parameter of former linear propagation model. The accuracy of our proposed method is verified by experimental results.