基于骨架和统计直方图的形状匹配算法

3.小组在讨论过程中，教师引导学生法兰盘加工的工艺，得出法兰盘零件一般选用两个基本视图来表达，即反映轴向内部结构和端面形状结构，为了表达某些局部结构，常采用局部剖等方法，轮辐、轮缘的横截面常采用断面图表示。 - 676 - 中国惯性技术学报 第 23 卷 累计分布函数|f(g)-fʼ(gʼ)|=min k |f(g)-fʼ(gʼ)|255g gʼf(g)fʼ(gʼ)01强度值 图 1 直方图匹配算法原理 fig.1 principle of histogram matching algorithm 1.2 精确直方图匹配 传统的直方图匹配方法是单值、单调增加的变换，无法确保强度变换的精度 [13] 。•sift算法是一种提取局部特征的算法，在尺度空间寻找极值点，提取位置，尺度，旋转不变量。

It is difficult to recognize objects when they are flexibility change and partial occlusion。 The traditional algorithm based on shape matching can’t be effectively used to recognize them。 To solve this problem, a new method for recognition flexibility change and partial occlusion objects combined skeleton and histogram is proposed。 The combine-points of skel-eton are detected, and the shape of objects is divided into several regions based on combine-points; The invariant of sub-region is established and construct the invariant features in a histogram;A new similarity measure function is built for the histogram;The similarity of both model and target is computed to judge whether two shapes are match。直方图匹配算法原理

In this paper, skeleton combine-points are extracted, compared with skeleton end-points, this method is more stable and the matching accuracy has also improved。 This algorithm uses sub-region description, which can effectively recognizes objects of flexi-bility change and partial occlusion。 Theoretical analysis and experimental results show that the algorithm is effective。