A height measure method based on surveillance video camera calibration

Measurement of video image is important task of computer vision. Facing the extensive use of the surveillance video equipment, the problem of measure the object length has become an important requirement in security monitoring. The surveillance video image measurement process needs two steps, the first step is to calibrate the camera, and the second is to measure targets based on camera intrinsic and extrinsic parameters. Considering the scene of the urban video surveillance, a novel calibration tools is designed to adapt to such scenes. Based on the tools, the homographic matrix and camera parameters algorithm is applied. And then, the measurement method of body height on the ground is proposed. It has been proved by experiments and via analysis that the method is able to measure height within acceptable error range.