A modified calibration technique of camera for 3D laser measurement system

摘要

For overcoming some existing problems of traditional Coordinate Measuring Machine (CMM), a novel robot 3D laser measurement system which is representative in reverse engineering is designed in this paper, and its composition and working principle are introduced in detail. For the purpose of measuring the workpiece accurately, the system model must be built, namely, the CCD parameters must be calibrated. To a great extent, system measurement precision is dependent on the precision of system model. Tsai algorithm is known as its moderate computation and high precision, but it is over-dependence on the initial values of parameters. Aiming at this situation, a modified Tsai algorithm for CCD parameters calibration is presented in this paper. In order to validate its effectivity, a case is given, and from the results, it is shown that the modified algorithm has easier computation, faster speed and higher precision than Tsai. Accordingly, the modified algorithm provides a theoretical guarantee for the practicability of 3D laser measurement system.