Camera positioning correction calibration method and system

Abstract

The present invention discloses a camera positioning correction calibration method and a system for realizing the method, belonging to the technical field of image virtual production. Through the intrinsic relationship among a lens parameter, an imaging surface and an optical tracking device, by using the world coordinate and image point coordinate of N mark points on a background screen and the internal parameter and lens distortion parameter of a camera lens, the rotation matrix between a camera coordinate system and a world coordinate system and the translation vector of a camera perspective center in the world coordinate system are obtained, combined with the current position information given by a camera posture external tracking device in a current state, camera correction calibration information and viewing angle are obtained, the lookup table with a focusing distance and a focus length relationship is established, thus when a camera position, a lens focal distance and a focusing distance change, the position of the virtual camera of the virtual production system is fully automatically positioned and corrected, and thus a real video frame picture and a virtual frame image generated by a computer can be matched perfectly.

Description

technical field [0001] The invention relates to a camera positioning correction calibration method and a system for realizing the method, and belongs to the technical field of image virtual production. Background technique [0002] The pose of the virtual camera and the angle of view are two very important information required by the computer image rendering engine. In the virtual photography production process, in order to obtain good visual effects, it is required to match the real shot picture with the virtual picture. This matching means that the effect of the virtual picture can imitate the shooting effect of the real camera. If the focal length and focusing distance of the camera lens change, the field of view of the virtual camera will also change in real time; The position of the virtual camera in the engine also changes accordingly. New Auto (Beijing) Video Technology Co., Ltd. proposed a calibration parameter acquisition method and device (application number 2008...

AI Technical Summary

Problems solved by technology

The camera tracking method of the existing real-time image virtual preview system is mainly measured manually, and then manually adjusted according to the green screen marker points or other feature points. In addition, factors such as focusing distance and field of view are not considered, which leads to inefficiency. Low and low precision, resulting in misalignment between the video image from the camera and the virtual scene generated by the computer, resulting in an unreal feeling of the virtual scene, and the superimposition effect of the virtual scene and the real scene is not ideal

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