摘要
针对成像制导过程中对实时性和准确性的要求,对存在旋转和尺度变化的航拍照片的匹配进行研究,提出了一种基于对数极坐标变换的匹配和跟踪算法.匹配时先对基准图和实时图按多分辨率金字塔法进行对数极坐标变换,利用对数极坐标的旋转和尺度不变性进行匹配.匹配后,用相对运动时目标的对数极坐标变换图像梯度下降最小相异评估方法对目标进行跟踪,通过对航拍照片进行匹配测试,证明了这种方法的有效性.
In order to meet the real-time and precise guiding demand in missile end game, a regis- tration and tracking algorithm based on log-polar by researching the rotated and scaled airborne imagery was brought forward. Log-polar transformation of reference and target images with multiresolution pyramid was carried out. The registration algorithm was carried out by the rotate and scale invariance property of log-polar coordinate in scene registration process. By using log-polar image gradient descent for minimizing a dissimilarity measure, mission was tracked. The registration of the airborne imagery shows that the method is efficient.
出处
《弹道学报》
EI
CSCD
北大核心
2007年第4期86-89,共4页
Journal of Ballistics
基金
国家航空科学基金项目(20070153005)
湖北省教育厅科学研究计划基金项目(D200715003)
关键词
景像匹配
对数极坐标变换
梯度下降
最小相异
scene registration
log-polar transform
gradient descent
minimizing dissimilarity