A New Approach to The Initial Value for The Exterior Orientation of The Single Version

【摘要】：Single mobile vision coordinate measurement system is a measurement that is placed in the measurement site using a single camera body to achieve three-dimensional coordinates.To obtain more accurate approximate values of exterior orientation calculation in the follow-up is very important in the measurement process.The problem is a typical one for the space resection,and now studies on this topic have been widely conducted in research.Single-phase space resection mainly focuses on two aspects:of co-angular constraint based on the method,its representatives are camera co-angular constraint pose estimation algorithm and the cone angle law;the other one is a direct linear transformation (DLT).One common drawback for both methods is that the CCD lens distortion is not considered.When the initial value was calculated with the direct linear transformation method,the distribution and abundance of control points is required relatively high,the need that control points can not be distributed in the same plane must be met,and there are at least six non-coplanar control points.However,its usefulness is limited.Initial value will directly influence the convergence and convergence speed of the ways of calculation.This paper will make the nonlinear of the total linear equations linearized by using the total linear equations containing distorted items and Taylor series expansion,calculating the initial value of the camera exterior orientation.Finally,the initial value is proved to be very good through experiments.