Research on 3D Measurement of Free Form Surface Based on Computer Vision Technique

On the basic of computer vision principle, a free surface measurement system is proposed. The paper uses the more rational model of two plane to calibrate the camera to acquire the sophisticated parameter matrix, a distorted stripe is obtained on surface. The authors finds the mating points at sub-pixel level by using epipolar geometry constrain. In coordinate computing, multiple variables non-linear optimized problems with constraint are changed into least squares problems of linear equation group utilizing Screw theory, which simplifies the computing complexity and advances stability in solving course.