Differential GPS system-based camera calibration method under external large visual field condition

Abstract

The invention relates to a differential GPS system-based camera calibration method under an external large visual field condition. The method comprises the following steps of: loading a mobile part of a differential GPS system onto a flying platform to form a space control point unit; controlling the movement of the flying platform in a to-be-calibrated camera visual field to obtain a space coordinate of the space control point unit under the current world coordinate system; and extracting an image coordinate of an image point corresponding to a control point by utilizing a target tracking and positioning or manual reminding method. According to the method provided by the invention, the problem that space control points are difficult to obtain under the external large visual field condition is solved, the measurement accuracy of the differential GPS system can achieve the centimeter level, and a result can worked out through uniformly distributing the control points in the visual field, so that the method is high in accuracy, simple and practical.

Description

technical field [0001] The invention mainly utilizes the advantages of the differential GPS system to obtain the coordinates of the camera space control point and the image coordinates of the corresponding image points with high precision, simply and quickly, to calibrate the camera under the condition of a large field of view in the outfield. Background technique [0002] With the continuous development of science and technology, photogrammetry technology has been widely used in various precision measurement and motion measurement, involving aerospace, national defense test, survey and survey, transportation and other fields. Its main advantages over other measurement technologies lie in its remarkable features such as high precision, non-contact, motion and dynamic measurement, and real-time measurement. High-precision calibration of camera parameters is the basis for high-precision camera measurement, including internal parameters such as principal point and focal length,...

AI Technical Summary

Problems solved by technology

This invention solves the problem that it is difficult to obtain spatial control points under the condition of large field of view in the external field, and since the measurement accuracy of the differential GPS system can reach centimeter level, theoretically only the control points are required to fill the field of view to solve the result, so the Calibration method with high precision, simple and practical

Images