基于直线特征及模板倾斜修正的图像匹配定位

针对火炮发射图像序列中运动目标后座的旋转问题，提出了基于直线特征及模板倾斜修正的匹配定位方法。该方法首先利用Hough变换提取出具有反应倾斜角特征的直线，与基准直线比较，算出直线旋转角度α，再把包含模板的基准图部分区域旋转α后截取新模板，使问题回到只有平移的情况并进行去均值归一化相关法（NNPROD）匹配。实验与分析表明，该方法可以有效地解决存在旋转、灰度对比度变化大、噪声干扰强、强光饱和等情况下的匹配定位问题，匹配精度较高。

Image Matching Location Based on Line-Feature and Slant of Template Amending

As the edge of gun tube reflects clearly the inclination angle in the image sequences of gun firing, image matching location based on line-feature and slant of template amending is developed in this paper. Comparison by line extraction by Hough transform and computation of the inclination angle can help accurately match image by template modifying using NNPROD. The experiments and theoretical analysis demonstrate that the method is effective for matching images with rotation, intensity contrast change, noise corruption and intensity saturation, etc.