National Taiwan Ocean University Institutional Repository:Item 987654321/41096
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 28603/40634
造访人次 : 4216278      在线人数 : 57
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 进阶搜寻

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41096

题名: Quadtree Segmented Wavelet Transform Image Coding
作者: Jia-Chyi Wu;Ming-Kai Shih
贡献者: 國立臺灣海洋大學:通訊與導航工程學系
日期: 2015
上传时间: 2017-02-08T06:51:41Z
出版者: Frontiers in Artificial Intelligence and Applications
摘要: Abstract: Wavelet transform has been received a great interest because it provides a multi-resolution representation of images. Wavelet transforms have been shown to achieve high compression ratios while maintaining very good image quality, due to the fact that edge characteristics of images can be well preserved by this method at low bit ratesBy way of vector quantization technique, the wavelet transformed coefficients can be further compressed. For real time image compression, achieving high data compression ratio and coding efficiency at the same time are both important. In this study, we have proposed a preprocessed quadtree segmentation method for Wavelet transform image coding. Quadtree segmentation algorithm is used to divide a given image, where regions with image detail will be segmented into blocks with smaller block size, and the background of the image will be assigned larger block size. Each image sub-block is coded by Wavelet transform scheme to gain a better compression quality. After the wavelet transform, to select appropriate size for codebook, bit allocation assignment is applied associated with the variance of each subband image block. We have also adopted rate-distortion concept to adjust the compressed bit rate. For this proposed compression scheme, simulation results show that we can achieve acceptable visual quality and high compression ratio simultaneously. Furthermore, due to the small size of the codebook, we are able to reduce the computational time. System performance analysis is demonstrated in this study.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41096
显示于类别:[通訊與導航工程學系] 期刊論文

文件中的档案:

档案 描述 大小格式浏览次数
index.html0KbHTML60检视/开启


在NTOUR中所有的数据项都受到原著作权保护.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈