A Fast Extraction Method for Camera Space Stereo Calibration

Abstract

The invention belongs to the field of visual measurement, and relates to a quick extraction method for the space three-dimensional calibration of a camera. The method comprises the steps: installing a space three-dimensional calibration target before calibration, employing a three-coordinate measuring machine for measurement, and determining the precise three-dimensional position information of the centers of big and small ceramic ball targets; photographing the big and small ceramic ball targets through left and right cameras in a binocular visual system, extracting the feature information of the centers of the big and small ceramic ball targets in images, and solving two-bit pixel coordinates of the centers of the ceramic ball targets; finally solving the internal and external parameters of the left and right cameras on the basis of a direct linear conversion method, and achieving the three-dimensional calibration of the cameras in a three-dimensional space. On the basis of the direct linear conversion method, the method employs the binocular visual measurement system to overcome the limits of a conventional three-dimensional calibration method in the calibration process of the cameras, and achieves the high-precision calibration of the cameras.

Description

technical field [0001] The invention belongs to the field of visual measurement, and relates to a method for quickly extracting camera space stereo calibration based on a direct linear transformation method. Background technique [0002] With the continuous improvement of industrial production requirements, more and more measurement problems are faced, how to improve the accuracy and efficiency of measurement has become a hot issue in related research fields. Due to the advantages of non-contact, good real-time performance, high efficiency and the ability to realize on-machine measurement in visual measurement, its functions and application range are being promoted and improved more and more. The camera calibration link is the basis of visual measurement, and the accuracy of the calibration results will directly determine the accuracy of the final measurement results. At present, there are mainly three types of calibration targets used for visual measurement: one-dimensiona...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the limitations of the existing three-dimensional calibration device in the process of camera calibration, the present invention invents a method for quickly extracting camera space stereo calibration based on the direct linear transformation method

Its purpose is to solve the problems such as the difficulty of automatic recognition of spatial points in the camera calibration process, the lack of information on the depth of field, and the need to rely on high-precision spatial coordinate measurement equipment for tracking and measurement. By arranging in the measurement space, high-precision three-dimensional calibration objects that can be quickly extracted can be achieved. Realize fast and high-precision calibration of cameras

It overcomes the defects of the existing three-dimensional calibration device in the process of camera calibration, such as the difficulty of automatic recognition of spatial points, insufficient information in the direction of depth of field, and the need to rely on high-precision spatial coordinate measurement equipment for tracking and measurement, and has broad application prospects.

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