基于对数极坐标变换的景象匹配新方法  

New scene matching method based on log-polar transform

作　　者：李兆烽[1] 李言俊[1] 

机构地区：[1]西北工业大学航天学院,陕西西安710072

出　　处：《红外与激光工程》2008年第2期285-288,共4页Infrared and Laser Engineering

基　　金：航天科技创新基金资助项目;航空科学基金资助项目(04I53067);航空支撑科技基金资助项目(05C53005)

摘　　要：景象匹配中,实时目标图与基准目标图之间的亮度、对比度、噪声水平以及旋转等差异是造成误匹配的重要原因。针对这个问题,引入对数极坐标变换运算,根据它的旋转不变性,提出了一种新的基于对数极坐标变换的景象匹配方法。与已有的抗任意角旋转的圆投影算法相比,提出的算法不仅具有更高的匹配准确率和更强的适应性,而且实时性较好。仿真实例验证了算法的优势与有效性,在巡航导弹和弹道导弹景象匹配末制导中有很好的应用前景。In scene matching, false matching occurs due to brightness, contrast, scale, noise, and rotation difference between real-time target image and standard target image. Aiming at this problem, logpolar algorithm was introduced. A new scene matching method was proposed, based on log-polar transformation, which had such trait as invariance to rotation. Compared with existing circular projection algorithm, which was invariant to rotation, the new algorithm had higher matching rate and stronger adaptability, and took shorter time. Experimental result demonstrates its own advantage and availability. This new scene matching method is promising in final guidance of cruise missile and ballistic missile.

关 键 词：景象匹配 对数极坐标变换 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]