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论文作者:www.51lunwen.org论文属性:学术文章 Scholarship Essay登出时间:2015-03-01编辑:Cinderella点击率:10147
论文字数:3012论文编号:org201502062144114550语种:英语 English地区:美国价格:免费论文
关键词:computer vision algorithmsShadows图象阴影
摘要:本文研究了计算机视觉算法当中的图像阴影问题。作者对自身阴影和投射阴影两大类阴影作出了深入探讨。
Therefore a repeated partitioning with threshold value calculations will allow us to partition the data set into a no of classes or fuzzy sets, depending on the shape used to describe the membership in each set. Membership function generation is based on a partitioning or analog screening concept, which draws a threshold line between two classes of sample data. The main idea behind drawing the threshold line is to classify the samples while minimizing the entropy for an optimum partitioning.
Clustering refers to identifying the number of subclasses of c clusters in a data universe X comprised of n data samples and partitioning X into C clusters (2 < c < n), c=1 denotes rejection of the hypothesis that there are clusters in the data, where c=n constitutes the trivial case where each sample is in a cluster by itself. There are two kinds of c partitions of data; hard (or crisp) and soft (or fuzzy). Two important issues to consider in this regard are how to measure the similarity between pairs of observations and how to evaluate the partitions once they are formed. One of the simplest similarity measures is distance between pairs of feature vectors in the feature space. If one can determine suitable distance measure and compute the distance between all pairs of observations, them one may expect that the distance between points in the same cluster will be considerably less than the distance between points the different clusters.
Considering all of these, the segmentation process is done. Then calculate the mean value of each region and they calculate the mean value of nonshadow region. Take pixels whose values are larger than the mean value of region i as the nonshadow background. Then subtract the minimum channel from the maximum channel. This value is denoted as Xi. Then this value is binarized based on the assumption that shadows are often darker than the mean value of Xi, which is denoted as T. Then mark all pixels less than T. indicate the pixel on the red, green and blue channel and integrate them. To obtain this select the suitable values for m and n. For obtaining more accurate values some coefficient are selected. By integrating the pixels values of red, green and blue the final shadow is obtained.
Image segmentation is an important researc本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。