Improved Bit Allocation in an Error-Resilient Scheme Based on Distributed Source Coding
In this work we propose an error-resilient scheme that allows enhancing the robustness of a video stream. Based on distributed source coding (DSC) principles, an auxiliary stream is sent in parallel to the main stream as a redundant representation of the sequence that is used to correct errors at the decoder, thus reducing the impact of drift. In order to perform an optimal bit allocation in the auxiliary stream, the encoder needs to compute a reliable estimate of the expected video distortion observed at the decoder side due to channel loss. This paper proposes an algorithm to calculate the expected distortion of decoded DCT-coefficients (dubbed EDDD) and its application to the bit allocation problem in a DSC based auxiliary stream