A novel technique for practical implementation of pixel-domain Wyner-Ziv video coding in multi-user systems

In this paper, we present a novel rate allocation technique with a frame dropping mechanism for multi-user distributed video coding systems. Using an analytical approach based on entropy calculations, the quantization parameters are dynamically varied and the available system bandwidth unequally distributed among multiple users without the need for a permanent feedback channel. These calculations take into account the actual amount of movement in the transmitted video as well as the transmission channel conditions of the different users. A significant gain in the system performance is noticed, compared to the case with equal allocation of channel resources and constant quantization parameters.