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基于Walsh-Hadamard投影的快速Nonlocal-Means图像去噪 被引量：1

Fast Nonlocal-Means Image Denoising Method Based on Walsh-Hadamard Projection
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摘要 针对Nonlocal-means图像去噪算法计算强度较高的问题,提出了一种投影加速算法。分析了Nonlo-cal-means算法的计算瓶颈,利用Walsh-Hadamard变换的快速运算和自递归特性,使用一组完备的Walsh-Hadamard变换将图像块投影到其张成的空间中;利用Walsh-Hadamard投影的能量集中特性和匹配计算过程中的拒绝策略,在Nonlocal-means去噪算法的图像块匹配计算中快速丢弃无法匹配的图像块。实验结果表明,该算法获得了较好的加速性能,且去噪效果没有受到影响。 A fast Nonlocal-means image denoising method with projection is proposed.After analyzing the bottleneck of Noncal-means,the fast and auto-recursive computation of Walsh-Hadamard transform is used to project the image blocks into Walsh-Hadamard space.Because of efficient energy packing of Walsh-Hadamard projection,the algorithm can fast discard those impossible blocks by using a rejection scheme in the matching procedure of image blocks in the Nonlocal-means image denoising method.Experimental results show that the proposed method can accelerate the Nonlocal-means algorithm without image quality degradation.
作者 张志 王润生
机构地区 空军装备研究院 国防科技大学ATR实验室
出处 《宇航学报》 EI CAS CSCD 北大核心 2011年第2期380-387,共8页 Journal of Astronautics
基金 国家自然科学基金(60902088)
关键词 图像处理 图像去噪 投影 Nonlocal-means Walsh-Hadamard变换 Image processing Image denoising Projection Non-local means Walsh-Hadamard transform
分类号 TP391 [自动化与计算机技术—计算机应用技术]
作者简介 张志（1982-），男，博士，主要从事图像处理、分析与理解等方面的研究。通信地址：北京市2861信箱六分箱（100085）电话：（010）66919834—865 E—mail：zhizh．zhang@gmail．com
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参考文献28

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共引文献226

同被引文献19

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二级引证文献9

宇航学报
2011年 第2期

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