Constant quality control of Wyner-Ziv frames in DCT domain distributed video coding

For most DCT domain distributed video coding systems, fixed uniform quantizers are used to quantize all Wyner-Ziv (WZ) frames. However, it leads to uctuant video quality because the WZ frame quality is also greatly inuenced by the side information (SI) quality besides the quantizers. To address this issue, this letter proposes a new constant quality control strategy, which adaptively designs quantizers for each WZ frame according to its SI. We formulate the constant quality control problem into the adaptive quantization level (AQL) design problem, and propose a low complexity greedy algorithm to solve it. Experimental results demonstrate that the proposed algorithm decreases the quality uctuation obviously and improves the PSNR (peak signal-to-noise ratio) by 0.79dB as well when compared with the state-of-the-art algorithm.