华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (6): 1-5.

• 电子、通信与自动控制 • 上一篇    下一篇

基于医学图像ROI形状估计的改进SPIHT算法

徐向民1 邢晓芬1 刘伟2 陈小川1   

  1. 1.华南理工大学 电子与信息学院,广东 广州510640;2.中国科学技术大学 电子科学技术系,安徽 合肥 230001
  • 收稿日期:2005-05-11 出版日期:2006-06-25 发布日期:2006-06-25
  • 通信作者: 徐向民(1972-),男,博士,副教授,主要从事医学视频处理、多媒体图像通信方面的研究 E-mail:xmxu@scut.edu.cn
  • 作者简介:徐向民(1972-),男,博士,副教授,主要从事医学视频处理、多媒体图像通信方面的研究
  • 基金资助:

    广东省自然科学基金资助项目(031449,0510054)

Improved SPIHT Algorithm Based on ROI Shape Estimation of M edical Image

xu Xiang-min1 Xing Xiao-fen1  Liu Wei2  Chen Xiao-chuan1   

  1. 1.College of Electronic and Information Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.Dep.of Electronic Science and Technology,Univ.of Science and Tech.of China,Hefei 230001,Anhui,China
  • Received:2005-05-11 Online:2006-06-25 Published:2006-06-25
  • Contact: 徐向民(1972-),男,博士,副教授,主要从事医学视频处理、多媒体图像通信方面的研究 E-mail:xmxu@scut.edu.cn
  • About author:徐向民(1972-),男,博士,副教授,主要从事医学视频处理、多媒体图像通信方面的研究
  • Supported by:

    广东省自然科学基金资助项目(031449,0510054)

摘要: 为提高医学图像的传输质量和编码效率,提出了一种新的位平面提升方法和基于感兴趣区域(ROI)形状估计的改进分层树集合分割排序(SPIHT)算法.位平面提升时,采用交错提升方法,在不需传输掩模的情况下实现感兴趣区域与背景的相对质量可调;对提升后的位平面,通过传输ROI外接规则形状的几何参数,根据估计的掩模信息超前判定零树,节省图像比特数.实验结果表明,在相同的截断码流下,相比SPIHT算法,改进的算法无论是ROI还是整幅图像都有更好的图像质量,且码率越低效果越明显.

关键词: 渐进传输, 感兴趣区编码, 分层树集合分割排序, 医学图像

Abstract:

In order to improve the transmission quality and coding eficiency of medical images,a novel bitplane lifting algorithm and an improved SPIHT(Set Partitioning in Hierarchical Trees)algorithm based on ROI(Region of Interest)shape estimation is proposed.By implementing the interlaced lifting of bitplane,the relative quality of the ROI and the background becomes adjustable without transmitting any mask information.For the bitplane after the lifting,the estimated mask inform ation can be obtained by transmitting the geometric parameter of the circum rule shape of ROI.According to the estimated mask inform ation,zero trees are determined be~rehand,so that the coding bits of the image can be saved.Experimental results show that,at the same truncation bit rate,both the ROI and the whole image obtained by the improved algorithm are of better image quality than those obtained by the traditional SPIHT algorithm,and that the lower the bit rate is,the more obvious the results are.

Key words: progressive transmission, region of interest coding, set partitioning in hierarchical trees, medical image