基于方向码的模板匹配方法  

Orientation codes-based template matching method

作　　者：王培容[1] 李姣军[1] 陈鸿雁[1] 

机构地区：[1]重庆工学院电子信息与自动化学院

出　　处：《计算机工程与设计》2007年第14期3407-3409,共3页Computer Engineering and Design

摘　　要：提出了一种新的基于方向码的模板匹配方法。算法由两步构成:在匹配的第1步,利用方向码直方图选择匹配候选点并粗略估算出旋转角度;在匹配的第2步,针对匹配候选点,利用模板和子图间方向码的差值进行匹配。实验证明提出的算法在真实图像具有旋转变化时仍是稳定的,这是因为匹配是基于由像素梯度信息计算出的方向码进行,而不是直接根据灰度值进行。A new method of orientation codes-based template matching is proposed. The proposed algorithm consists of two stages. In the first stage, the matching candidates are selected using histograms of orientation codes and rotation angles are computed roughly. In the second stage, matching based on differences of orientation codes between template and rotated subimage is performed only for the matching candidates. Experiments demonstrate the proposed method is robust against rotation variation in the real world images since it is based on matching gradient information around each pixel, computed in the form of orientation codes, rather than the gray values directly.

关 键 词：方向码 相似度 梯度 模板匹配 旋转不变性 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]