中国空间科学技术

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一种基于SPIHT算法的小波图像编码

陈红卫,张焕春,黄国建   

  1. 南京航空航天大学自动化学院,南京航空航天大学自动化学院,江苏科技大学电子与信息学院 南京210016 ,南京210016 ,镇江212003
  • 发布日期:2005-10-25

A Kind of Wavelet Image Coding Based on SPIHT Algorithm

Chen Hongwei Zhang Huanchuan(College of Automation Engineering,Nanjing University of Aeronautics & Astronautics,Nanjing 210016)Huang Guojian(College of Electronics and Information,Jiangsu University of Science and Technology,Zhenjiang 212003)   

  • Online:2005-10-25

被引次数

5

摘要： 在研究图像小波分解系数特点与SPIHT算法的基础上,针对SPIHT算法中三张链表在编码过程中以同一模式处理仍存在冗余,提出了一种基于SPIHT算法的小波图像编码。算法采用分区间处理,对LIP、LIS、LSP三张链表在不同的系数范围内采取不同的编码模式,当阈值减少时四邻域中同一量化级的重要系数个数明显增加,并且绝对数值较接近,编码时只保存这几个重要系数的平均值。给出了实验结果,并与原SPIHT算法比较,结果表明:文章给出的编码方法的编码性能优于原算法。

关键词: 图像编码, 数据处理, 仿真实验

Abstract: After the studying of image wavelet decomposing coefficients and SPIHT algorithm,a wavelet image coding algorithm is introduced based on SPIHT,which aims at solving the(redundance) problem existing in three link tables coding of SPIHT even processed by same mode.The algorithm adopt different coding mode according to different coefficients range in three link(table) LIP、LIS and LSP.When threshold value decrease,the number of significant coefficients with same quantization level increase greatly in four domain,the absolute values of coefficients are close to each other,so only the averages of these significant coefficients are saved in coding process.The experiment results of the algorithm are compared with SPIHT algorithm,and show that the(algorithm) is excelled in PSNR and bpp.