Calibration technology on binocular CCD ranging system based on improving Tsai two-step method

A completely linear approach for binocular CCD ranging system calibration is presented in this paper, and it improves the Tsai´s calibration algorithm. First, we are solving the other internal and external camera parameters based on Radial-Array-Constraints and first-order radial distortion model, which include focal length, first-order radial distortion parameter, rotation matrix and translation vector. Next, the calibration of binocular CCD ranging system includes baseline of the high precision binocular ranging system, relative position of two image plane and optical axis angle of two cameras. Finally, basing on the results of calibration, we are amending the binocular ranging formula. Experiments show that the precision is higher for most of the camera calibration, the method has wide applicative value. The application of this method, the actual measurement accuracy of 3km target is less than 0.5%, it can satisfy the requirements of high precision of binocular CCD ranging system.