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一种基于矩不变原理的散焦测距方法
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作者 孙玲 栾晓明 王鑫 《弹箭与制导学报》 CSCD 北大核心 2005年第S3期262-264,共3页
恢复图像中物体的三维信息一直都是计算机视觉领域中非常重要的一环,而物体到摄像机的距离又是景物三维重建的关键。利用矩不变原理,研究了一种测量散焦图像中景深的新方法。该方法是用摄像机获取二幅相同景深,不同模糊程度的图像,将灰... 恢复图像中物体的三维信息一直都是计算机视觉领域中非常重要的一环,而物体到摄像机的距离又是景物三维重建的关键。利用矩不变原理,研究了一种测量散焦图像中景深的新方法。该方法是用摄像机获取二幅相同景深,不同模糊程度的图像,将灰度图像转换成梯度图像,利用矩不变原理计算梯度图像中边缘区的大小与整个窗口图像区大小的比值,然后根据二幅图像的比值计算出物体的景深。 展开更多
关键词 制距方法 模糊 散焦 梯度
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Novel similarity measures for face representation based on local binary pattern
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作者 祝世虎 封举富 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第2期223-226,共4页
The successful face recognition based on local binary pattern(LBP)relies on the effective extraction of LBP features and the inferring of similarity between the extracted features.In this paper,we focus on the latter ... The successful face recognition based on local binary pattern(LBP)relies on the effective extraction of LBP features and the inferring of similarity between the extracted features.In this paper,we focus on the latter and propose two novel similarity measures for the local matching methods and the holistic matching methods respectively.One is Earth Mover's Distance with Hamming and Lp ground distance(EMD-HammingLp),which is a cross-bin dissimilarity measure for LBP histograms.The other is IMage Hamming Distance(IMHD),which is a dissimilarity measure for the whole LBP images.Experiments on FERET database show that the proposed two similarity measures outperform the state-of-the-art Chi-square similarity measure for extraction of LBP features. 展开更多
关键词 similarity measurement local binary pattern Earth Mover's Distance IMage Euclidean Distance
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