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Block-Based Adaptive Threshold Wavelet Image Coding

Author: JiangYing
Tutor: JingXiaoJun
School: Beijing University of Posts and Telecommunications
Course: Communication and Information System
Keywords: Block coding Embedded Coding Set partitioned embedded block coding
CLC: TN919.81
Type: Master's thesis
Year: 2010
Downloads: 90
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Abstract


With the increasingly wide range of Internet applications and wireless video transmission demand increases, the amount of image data processing and transmission of a sharp increase in the existing image processing and transmission hardware is difficult to keep up with its development , the communication bandwidth and storage media tremendous burden. Therefore, the image data is processed using coding compression techniques to reduce the amount of information transmitted to become an inevitable choice for fast transfer of images . Image compression coding has become a very urgent research topic. The embedded coding with its unique advantages such as : support for progressive transmission , you can stop at any point coding, can strictly meet the goals and objectives of distortion rate requirements , etc., are increasingly used in progressive transmission of images , image Internet browsing and image transmission . In many embedded image coding algorithm , the most representative is the EZW, SPIHT, SPECK three coding algorithms. Which , EZW coding algorithm wavelet coding technology is a major leap forward . It does this by introducing zero-tree structure, to achieve efficient organization of the wavelet coefficients . SPIHT coding algorithm by EZW algorithm to improve the data structure , so that the overall performance to a better state. The focus of the paper SPECK algorithm, because full use of wavelet coefficients energy concentration and energy increase with scale attenuation characteristics of the quadtree splitting and combining bit- plane coding method , to obtain a better compression performance and got more attention. Although it has inter-block can be independently , coding speed, etc. , but the speed of its implementation , complexity, etc. , or whether there are areas for improvement . In this paper, a collection of coding sequence , the importance of testing and other aspects of the improvements. Improved block adaptive threshold algorithm not only retains the advantages of the original algorithm , but also has a higher coding efficiency. Simulation results show that the improved algorithm is correct , and verify in the realization of the speed , efficient coding efficiency .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
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