The calibration of image measurement system is the basis and prerequisite of acquiring 3D information adopting computer vision technology.A new technique for improving the accurary and speed of image measurement system calibration based on perspective transform method is presented.This technique utilizes the difference between the image processed by using perspective transform with distortion and the constructed simulation no-distortion image to ascertain the coefficient of distortion models.Then on the basis of distortion models continue to figure out other camera parameters.This technique evades the iterate method adopted by the traditional methods

and avoid the errors brought by the estimation of original parameters.It is fast

straightforward

accurate

effective and with practical.