Method and system for calibrating camera parameters under long-distance and large field of view conditions

Abstract

The present invention discloses a camera parameter calibration method and system under the condition of the long-distance large field of view. The calibration method comprises: capturing a mark platecarried by the drone by using a binocular imaging system to obtain a mark image, wherein the mark plate is provided with a mark point, and the drone is flying under the condition of the long-distancelarge field of view of the binocular imaging system; determining a basic matrix of the binocular imaging system according to the mark image; determining an equivalent focal length of the binocular imaging system according to the basic matrix; determining an essential matrix of the binocular imaging system according to the basic matrix; determining a rotation matrix and a translation vector of thebinocular imaging system according to the essential matrix; and optimizing the equivalent focal length, the rotation matrix, and the translation vector according to a least squares fitting method to obtain optimized camera parameters. By using the calibration method and system provided by the present invention, the internal and external parameters of the camera can be calibrated at a low cost under the condition of the long-distance large field of view.

Description

technical field [0001] The invention relates to the field of photoelectric detection, in particular to a method and system for calibrating camera parameters under the condition of long-distance and large field of view. Background technique [0002] The calibration of a dual-camera system is essentially the process of determining the internal and external parameters of the camera. The internal parameters are the internal geometric and optical parameters inherent in the camera itself and have nothing to do with the position. The internal parameters include: the coordinates of the principal point of the image, the equivalent focal length, the scale factor, and the lens distortion. etc.; while the extrinsic parameters refer to the relative positional relationship of the dual cameras, which are generally represented by a rotation matrix and a translation vector. In a broad sense, the calibration of dual cameras can be divided into traditional calibration methods and self-calibrat...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method and system for calibrating camera parameters under the condition of long-distance and large field of view, so as to solve the problem that the calibration board in the prior art is expensive to manufacture and the camera cannot be calibrated under the condition of large field of view

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