Camera calibration method and system based on multiple homography matrixes and storage medium

Abstract

The invention discloses a camera calibration method and system based on multiple homography matrixes, and a storage medium. The method comprises the following steps: obtaining n attitude images obtained by shooting a plane calibration plate; segmenting the image plane of each image into N regions; respectively extracting a plurality of angular points of the calibration pattern in each area of each image, and calculating a homography matrix of the area according to a corresponding relation between an object plane of the calibration plate and an image plane imaged by a camera; performing internal and external parameter calculation according to the homography matrix of the same area in the n images, and performing first optimization on each group of internal and external parameters; respectively introducing distortion values into the N groups of internal and external parameters after the first optimization to carry out distortion correction calculation; and carrying out combination and second optimization on the N groups of internal and external parameters after distortion correction calculation to obtain final internal and external parameters. According to the invention, errors caused by deformation of the calibration plate in the process of using a plane calibration method are reduced, and the precision of a calibration result is improved.

Description

technical field [0001] The invention relates to the technical field of image generation, and in particular, to a camera calibration method, system and storage medium based on a polyhomography matrix. Background technique [0002] With the development of machine vision and 3D imaging technology, there are more and more application scenarios, such as film special effects, cultural relics protection, film and television production, animation games, motion capture and other fields. Cameras or video cameras are used as image acquisition equipment, and their performance parameters are accurate. The degree affects the accuracy of the later model. In image measurement and three-dimensional imaging, it is necessary to establish the three-dimensional position of a point on the surface of a space object and the relationship between its corresponding point in the image. The basic parameters of the camera lens and the relationship between the object and the image need to be determined b...

AI Technical Summary

Problems solved by technology

The three-dimensional calibration object can be calibrated by a single image, and the calibration accuracy is high, but the processing and maintenance of high-precision three-dimensional calibration objects are difficult

[0008] The planar calibration object is relatively simpler than the three-dimensional calibration. The existing technology regards the calibration plate plane of the planar calibration object as an ideal plane in the calibration process. However, in actual use, the calibration plate is not an ideal plane, and in the process of use Minor deformation cannot be avoided. If it is regarded as an ideal plane during the calibration calculation process, deformation errors will be introduced, which will lead to large errors and low precision in the calibration results of the camera.

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