Improving perceptual quality and network performance for transmission of H.263 video over ATM

In this work we address issues relating to the transmission of H.263 coded video over ATM. First, we show that transmitting H.263 over ATM without taking buffer overflow into account can cause severe degradation in the quality of the video transmitted. Next, we propose two strategies for improving the quality of H.263 compressed video transmitted over an ATM link. One strategy controls the H.263 coding depending on the congestion level in the buffer, while the other strategy, partial encoding, also codes part of the fixed (I) frames along with the predictive (P) frames. It is demonstrated that partial encoding of fixed frames gives better perceptual image quality and network performance between the two proposed methods