基于透视投影变换与动态候选策略的目标交接算法

Target handoff algorithm based on perspective projection transformation and dynamic candidate strategy

提出使用透视投影变换与动态候选目标策略相结合的算法来实现多摄像机可靠的目标交接。首先提出使用透视变换来获得多摄像机画面的对应关系,然后采用最短距离法计算出多摄像机之间的对应目标。但由于摄像机镜头存在畸变系数,或受光照、图像背景干扰使得目标提取不准确,使目标投影到另一个摄像机画面的位置发生误差;特别当多个目标之间的距离较近时,采用最短距离法进行目标交接会产生多个候选目标。因此提出新的动态候选策略,根据目标运动信息的先验知识和颜色外观模型建立最大似然相似函数,获得特征相似度值最大的目标作为对应目标。实验结果证明,该适应场景复杂度的动态候选策略具有较强的鲁棒性。

Reliable target handoff is a challenging task. A novel target-handoff based on perspective projection transformation and dynamic candidate strategy was proposed. Firstly, the relationship between two cameras was computed for projection transformation. Then the shortest distance method for indentifying the corresponding targets among multi-cameras was designed. However, there is more than one candidate in case that multiple targets on the camera are closer or perspective projection matrix is inaccurate. A dynamic candidate strategy was proposed for recognizing the corresponding targets by the target-motion information of prior knowledge and color appearance model. Experimental results demonstrate that the dynamic candidate strategy was adapted to complexity scene, having stronger robustness.