System Design of Transform-Domain Wyner-Ziv Coders

• Main Authors: Tung-Chao Li, 李桐照
• Other Authors: 楊士萱
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/tzfdw9

碩士 === 國立臺北科技大學 === 資訊工程系所 === 94 === Distributed video coding (DVC) is a new paradigm for video compression, which shifts the bulk of the computational burden from the encoder to the decoder. In this thesis, we propose a new transform-domain Wyner-Ziv coder, which attempts to compress the low-frequency wavelet coefficients. The proposed Wyner-Ziv coder is composed of a uniform quantizer, a rate-compatible punctured turbo (RCPT) code, and a type-II ARQ mechanism. We modify the conventional turbo encoding/decoding algorithm to accommodate our needs. An adaptive virtual channel model is established to dynamically measure the correlation between the coding and estimated bits. The turbo-decoding parameters are thus adjusted. We further present a rate-distortion estimation technique for fast optimal bit allocation. Experimental results show that the proposed method effectively reduces the bit rate with reasonably low encoding complexity.