Research on twostep susceptible and interpolated calibration algorithm
SHI Mingqiang ，ZHANG Haixiang，LU Zheng，HU Huijun ，YU Qingcang
（College of Electronics and Information，Zhejiang SciTech University，Hangzhou 310018,China)
Abstract: Aiming at improving the calibrated efficiency and precision,a twostep susceptible calibration algorithm based on the interpolation technique was introduced.In this twostep method ,the traditional method which adjusts the position relationship between experimental platform and calibration plane by manual measurements was abandoned,the computer was made to be able to "perceive" the deviation existed between the CCD axis and the normal of calibration the plane,so as to the shortages of artificial measurements were made up.At first, by the subpixel coordinations of the extracted corner points, the corresponding relationship between the corner points of imaging plane and the world coordinate was directly established during the calibration. Then the world coordinates of any points in the plane were obtained according to the interpolation of the known corner points.At the same time a experiment was done to test the actual plane symbol graph.The results prove that this method improves the calibrated efficiency and precision,and lay the foundation for 3D reconstruction.
Key words: structured light; interpolation; subpixel; system calibration; threedimension coordinate