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基于Cycle-spinning的多帧图像Contourlet去噪
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作者 程燕 《计算机科学》 CSCD 北大核心 2013年第11A期314-317,共4页
本文提出一种改进的Cycle-spinning多帧Contourlet域图像去噪算法。根据视频序列连续帧间存在的运动信息,使用帧间位移矢量来代替平移技术对图像进行Contourlet去噪,基于帧间相关性不同的特点,改进Cycle-spinning变换为加权平均以消除... 本文提出一种改进的Cycle-spinning多帧Contourlet域图像去噪算法。根据视频序列连续帧间存在的运动信息,使用帧间位移矢量来代替平移技术对图像进行Contourlet去噪,基于帧间相关性不同的特点,改进Cycle-spinning变换为加权平均以消除伪吉布斯现象。实验结果显示该方法能有效去除各种类型的图像噪声,保留图像的细节和纹理信息,峰值信噪比(PSNR)有显著提高。 展开更多
关键词 cycle-spinning变换 CONTOURLET变换 多帧 图像去噪
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Color reproduction for noisy CFA data using directional cycle-spinning
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作者 Weiyu Yu Jing Tian Yonghao Xiao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第3期528-533,共6页
This paper addresses color filter array(CFA) color reproduction problem where the aim is to utilize an image captured by the CFA to produce an image with full color information.First,conventional subband synthesis b... This paper addresses color filter array(CFA) color reproduction problem where the aim is to utilize an image captured by the CFA to produce an image with full color information.First,conventional subband synthesis based color reproduction techniques do not consider the noise during image acquisition and assume that the CFA data are noiseless.To tackle the noisy CFA data,a novel approach is proposed by inserting a subband denoising scheme into the conventional subband synthesis framework.Second,conventional subband synthesis based techniques exploit the decimated wavelet transform that is not shift-invariant and could result in ringing artifacts in the result.To alleviate these artifacts,the directional cycle-spinning(DCS) technique is exploited.Furthermore,a new cycle-spinning pattern is proposed according to the sampling pattern of the Bayer CFA data.Extensive experiments are conducted to demonstrate that the proposed approach outperforms several approaches. 展开更多
关键词 color filter array(CFA) cycle-spinning denoising.
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简单有效的小波域图像插值放大算法 被引量:1
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作者 杨爱萍 王成优 何凯 《计算机工程与应用》 CSCD 北大核心 2009年第4期9-10,15,共3页
提出一种基于Cycle-Spinning的小波域图像插值放大算法。Cycle-Spinning技术已证明是小波去噪中消除伪Gibbs效应的有效方法,将低分辨率图像作为高分辨率图像的低频子带,将高频系数置零,再进行反变换,得到高分辨率图像的初始估计。在此... 提出一种基于Cycle-Spinning的小波域图像插值放大算法。Cycle-Spinning技术已证明是小波去噪中消除伪Gibbs效应的有效方法,将低分辨率图像作为高分辨率图像的低频子带,将高频系数置零,再进行反变换,得到高分辨率图像的初始估计。在此基础上,利用Cycle-Spinning技术处理得到高分辨率图像,很好地消除了边缘锯齿现象。经实验仿真,并与传统及改进插值算法比较,提出的算法简单、快速、有效,使放大后的图像无论在边缘处还是平滑区域均能达到理想的效果。 展开更多
关键词 cycle-spinning 内插 放大 小波变换
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Multilevel Threshold Based Image Denoising in Curvelet Domain 被引量:7
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作者 Nguyen Thanh Binh Ashish Khare 《Journal of Computer Science & Technology》 SCIE EI CSCD 2010年第3期632-640,共9页
In this paper, we propose a multilevel thresholding technique for noise removal in curvelet transform domain which uses cycle-spinning. Most of uncorrelated noise gets removed by thresholding curvelet coefficients at ... In this paper, we propose a multilevel thresholding technique for noise removal in curvelet transform domain which uses cycle-spinning. Most of uncorrelated noise gets removed by thresholding curvelet coefficients at lowest level, while correlated noise gets removed by only a fraction at lower levels, so we used multilevel thresholding on curvelet coefficients. The threshold in the proposed method depends on the variance of curvelet coefficients, the mean and the median of absolute curvelet coefficients at a particular level which makes it adaptive in nature. Results obtained for 2-D images demonstrate an improved performance over other recent related methods available in literature. 展开更多
关键词 curvelet transform DENOISING multilevel thresholding cycle-spinning
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