Establishment of Quasi-2D Control Field for Computer Vision Measurement
Establishment of quasi-2D control field was a key step to founding CCD camera digital distortion model. The quasi-2D control field was set up in 3.52m×2.24m region. 345 control points, with photo paper as agent, and made up with two squares, and signed with black and white colours, were evenly distributed in the quasi-2D control field. The 3D-coordinates of control points in the quasi-2D control field were measured by single measurement model electronic theodolite industrial surveying system of "Building Blocks Type". The measurement accuracy of the result excels 0.15�A . The study result shows that foundation of CCD camera digital distortion model with quasi-2D control field is cheap, accurate and convenient.