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采用改进结构特征度度量分析的噪声标准差估计算法 被引量:2
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作者 王科俊 杨晓飞 《智能系统学报》 CSCD 北大核心 2015年第2期255-260,共6页
提出了一种基于改进的噪声标准差估计的轮廓波去噪算法,在常用的轮廓波去噪算法基础上提出了新的解决方案。该方案将滤波法与改进的图像结构特征度度量分析算法结合起来,筛选出适合计算噪声标准差的图像子块集合,再用直方图法估计图像... 提出了一种基于改进的噪声标准差估计的轮廓波去噪算法,在常用的轮廓波去噪算法基础上提出了新的解决方案。该方案将滤波法与改进的图像结构特征度度量分析算法结合起来,筛选出适合计算噪声标准差的图像子块集合,再用直方图法估计图像噪声标准差,然后将该标准差用于轮廓波去噪。在标准差估计对比试验中,将滤波法、分块法、改进的分块法与文中的标准差估计算法进行对比;在去噪对比试验中,采用基本的小波阈值去噪算法(universal阈值),由小波阈值法引申出的普通轮廓波阈值去噪算法,基于维纳滤波的轮廓波去噪算法,基于系数建模的轮廓波去噪算法与文中算法做对比。实验结果表明:文中算法能够更加精确地估计图像噪声标准差,且去噪效果与普通轮廓波去噪及其他轮廓波去噪算法相比更加稳定,鲁棒性更好。 展开更多
关键词 图像去噪 轮廓波 图像噪声标准差估计 图像结构特征度 直方图法
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Vehicle detection algorithm based on codebook and local binary patterns algorithms 被引量:1
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作者 许雪梅 周立超 +1 位作者 墨芹 郭巧云 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第2期593-600,共8页
Detecting the moving vehicles in jittering traffic scenes is a very difficult problem because of the complex environment.Only by the color features of the pixel or only by the texture features of image cannot establis... Detecting the moving vehicles in jittering traffic scenes is a very difficult problem because of the complex environment.Only by the color features of the pixel or only by the texture features of image cannot establish a suitable background model for the moving vehicles. In order to solve this problem, the Gaussian pyramid layered algorithm is proposed, combining with the advantages of the Codebook algorithm and the Local binary patterns(LBP) algorithm. Firstly, the image pyramid is established to eliminate the noises generated by the camera shake. Then, codebook model and LBP model are constructed on the low-resolution level and the high-resolution level of Gaussian pyramid, respectively. At last, the final test results are obtained through a set of operations according to the spatial relations of pixels. The experimental results show that this algorithm can not only eliminate the noises effectively, but also save the calculating time with high detection sensitivity and high detection accuracy. 展开更多
关键词 background modeling Gaussian pyramid CODEBOOK Local binary patterns(LBP) moving vehicle detection
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