测绘学报

• 学术论文 •    

基于移不变全方向角提升的遥感图像降噪

王晓甜1,石光明2,牛毅1,矫恒浩3   

  1. 1. 西安电子科技大学
    2. 西安电子科技大学 电子工程学院
    3. 大唐移动通信有限公司
  • 收稿日期:2010-09-16 修回日期:2011-01-05 出版日期:2011-10-25 发布日期:2011-10-25
  • 通讯作者: 王晓甜

Translation Invariant Omnidirectional Lifting Based Remote Sensing Image Denoising

  1. 1.
    2. Xidian University School of Electronic Engineering
    3. Xidian University
  • Received:2010-09-16 Revised:2011-01-05 Online:2011-10-25 Published:2011-10-25

摘要: 在分析遥感图像结构特征及其与噪声之间主要区别的基础上,利用图像信号的方向信息,提出基于移不变方向提升小波抑制遥感图像噪声的方法。该方法在方向提升小波变换的基础上利用循环平移,Gabor小波滤波器和图像旋转技术改进了方向提升小波在图像去噪过程中存在的三个弊端:缺乏移不变性质,图像局部方向信息判方法断缺乏噪声鲁棒性和变换方向分布有限。消除了去噪结果中的吉布斯效应,提高了图像方向信息判断的准确性并保证了图像纹理方向始终落在方向提升能最优表示的方向区间内。实验结果证明本文方法在处理遥感图像的过程中能在去噪的同时保留图像的细节和边缘信息,对遥感图像中的边缘信息如道路和桥梁有较好的刻画性能,较传统方法去噪性能(PSNR)和主观视觉效果(SSIM)均有较大提高。

Abstract: After analyzing remote sensing image structure and its main difference from noise signals, this paper utilizes directional information in image signal and proposes a translation invariant omnidirectional lifting (TI-OL) for remote sensing image noise removal. By integrating cycle spinning, Gabor wavelet filter and image rotate skills into traditional adaptive directional lifting (ADL), the proposed algorithm overcomes three drawbacks in ADL as lacking of translation invariance, inefficiency in local direction estimation and limited transform direction distribution. In this way, the proposed method can reduce Gibbs effects in the denoising result, promote the accuracy of orientation estimation and guarantee an optimal representation for textural information. Experimental results demonstrate that the proposed method can effectively remove noise while protecting the image detail information. It outperforms state-of-art denoising algorithm in terms of both objective (PSNR) and subjective (SSIM) evaluation.