High-precision motion platform-based multi-camera calibration method

Abstract

The invention discloses a high-precision motion platform-based multi-camera calibration method. In a whole working region, a calibration plate fixed to a high-precision motion platform through an objective table can make any known linear motion of rotation, translation and the like, and a pose of the calibration plate in a world coordinate system is obtained. The calibration plate moves under the control of the high-precision motion platform to appear in sight of one or more cameras, the cameras shoot images, coordinates of corresponding points in the world coordinate system and an image coordinate system are searched for, and finally parameters of all the cameras are solved once by adopting a global optimization algorithm, so that the shortcoming of low efficiency, relatively large accumulative error, trouble of designing a specific calibration part or the like due to one-by-one calibration of cameras in a multi-camera system in an existing calibration method is overcome, one-time calibration of the whole multi-camera system is realized, the method has greatly important engineering application values, and high-precision calibration and three-dimensional reconstruction are finished. A measurement process is simple, a calibration result is accurate, and the working efficiency is improved.

Description

technical field [0001] The invention relates to a multi-camera system in the field of computer vision, in particular to a multi-camera calibration method based on a high-precision motion platform. Background technique [0002] Multi-camera systems are quite common in the field of computer vision. For example, in applications such as 3D reconstruction, motion capture, and multi-viewpoint video, a multi-camera system composed of various cameras, light sources, and storage devices is often required. Multi-camera system calibration, that is, determining the internal and external parameters of each camera, is an indispensable and important step for a multi-camera system to work reliably and efficiently. [0003] In the past, two methods were generally used for multi-camera system calibration: (1) Traditional calibration methods were used, but these calibration objects were self-occluded and could not be observed from multiple viewing angles at the same time, so it was impossible ...

AI Technical Summary

Problems solved by technology

However, in actual use, the design of calibration objects is difficult and not universal, and the practicability is poor and the accuracy of the calibrated parameters is low.

When any two cameras have little or no overlapping fields of view, the above two methods are powerless

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