A Rectification Algorithm for Photoelectric Image with Distortion Based on Method of Onsite Ascertained Standard
一种基于现场定标的光电图像畸变校正算法

A rectification algorithm for the distortional image which are captured with CCD camera is proposed,which introduces the multinomial transformation technique based on the method of onsite ascertained standard and ternary convolution into image rectification. The edges of an image is detected by gray Sobel operator with a attenuation factor. A gray edge image is obtained and is not distortional. Then the gray edge image can be processed using cubic spline interpolation. The location precision of the standard pattern is improved to sub-pixel. It improves the precision of edge detection. Using the established formulas of the function relation for rectification distortion, the spatial geometric coordinate transformation is achieved. It not only ensures the measured image in the special circumstance to be the high precision, but also makes the geometric distortion rectification of photoelectric image achieve good results.