Wavelet-based Distributed Video Coding

• Main Authors: Ming-De Lin, 林明德
• Other Authors: Shih-Hsuan Yang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/9ans56

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 wavelet-based DVC system. The key frames follow the prestigious SPIHT (set partitioning in hierarchical trees) encoding and decoding procedures. The Wyner-Ziv frames are separated into the low-frequency subband and the other high-frequency subbands. The high-frequency subbands of Wyner-Ziv frames are coded using the modified SPIHT algorithm. The low-frequency subband uses the grouped scalar quantization and turbo codes to remove its interframe redundancy. We investigate several issues crucial to the proposed system, including level of wavelet transform, estimation of highest-frequency coefficients, and the effects of motion estimation at the decoding side. We also present a bit allocation scheme within the Wyner-Ziv frames. The overall system is evaluated over several test sequences at various bit rates. Good PSNR performance with reasonable complexity is observed, especially at high bit rates.