借鉴变色龙视觉的高度独立性、对称性、全局性与选择性兼顾等特点,该文提出一种基于双PTZ(Pan-Tilt—Zoom)相机的主从跟踪方法。由于两个相机的对称性和参数可变性、可控性,这种方法相对于静止加主动相机的主从跟踪系统,可以增大监控范围;相对于多静止加主动相机的系统,可减小硬件开销;相对于全向加主动相机的系统,更有利于信息融合。该文设计了基于球面坐标模型的主从控制方法,可方便实现两相机在任意pan-tilt—zoom参数下的主从模式跟踪,实现对目标的多尺度视觉关注。在室外场景中进行的多组实验验证了所提方法的有效性。
This paper presents a master-salve tracking framework for wide area video surveillance with two Pan-Tilt-Zoom (PTZ) cameras, which is inspired by the chameleon vision of highly independent and symmetric, attention to both overall and local visual events. Because of the symmetry of two cameras and variability and controllability of camera parameters, compared with master-salve tracking system consisting of one static and one PTZ camera, the proposed system increases the surveillance coverage. Compared with system configuration using multiple static cameras and PTZ cameras, the proposed system decreases hardware cost. Compared with surveillance system composed of one omnidirectional and one PTZ camera, the proposed system is easy to fuse to exact more useful information. A master-slave control method is also designed using sphere coordinate model. Each camera can achieve cooperative master-slave tracking at arbitrary pan-tilt-zoom values. Therefore, visual attention of multi-resolution can be obtained. Quantitative results in the outdoor scene show good performance of the proposed approach.