关键词: 分布式视频编码, 相关噪声模型, 广义高斯分布, 重构

Abstract:

In order to improve the image quality of the decoded WZ (Wyner-Ziv) frame in distributed video coding system,WZ frame reconstruction technology based on generalized Gaussian distribution (GGD) was proposed. The correlation between the side information and the original WZ frame was considered as well. GGD was used for virtual correlation channel model so as to improve the rate distortion (RD) performance. Meanwhile,the condition expectation of the WZ was computed as the reconstructed WZ value for the given quantization interval and the known side information in which GGD is used as correlation noise model. The shape parameter of GGD is fixed to 0.5 so that it won't add extra complexity to the reconstruction technology. The closed-form expression of the optimal reconstructed values was derived. Experiments indicate that the proposed WZ frame reconstruction technology can improve the RD performance and image quality of the decoded WZ frame.

Key words: distributed video coding, correlation noise model, generalized Gaussian distribution, reconstruction