An Edge-Preserving Image Coding System with Vector Quantization

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概要

• 論文の詳細を見る

• Image coding with vector quantization (VQ) reveals several defects which include edge degradation and high encoding complexity. This paper presents an edge-preserving coding system based on VQ to overcome these defects. A signal processing unit first classifies image blocks into low-activity or high-activity class. A high-activity block is then decomposed into a smoothing factor, a bit-plane and a smoother (lower variance) block. These outputs can be more efficiently encoded by VQ with lower distortion. A set of visual patterns is used to encode the bit-planes by binary vector quantization. We also develop a modified search-order coding to further reduce the redundancy of quantization indexes. Simulation results show that the proposed algorithm achieves much better perceptual quality with higher compression ratio and significant lower computational complexity, as compared to the direct VQ.

• 社団法人電子情報通信学会の論文
• 1999-12-25

著者

• Wang C‐c

  Department Of Electrical Engineering Chung Cheng Institute Of Technology

• Wang Chou-chen

  Department Of Electrical Engineering National Cheng Kung University

• Hsieh C‐h

  Chien Kuo Inst. Technol. Changhua Twn

• Chen Chin-hsing

  Department Of Electrical Engineering National Cheng Kung University

• HSIEH Chaur-Heh

  Department of Information Engineering, I-Shou University

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