Multi-camera calibration method based on minimum optical path principle and transparent glass calibration plate

Abstract

The invention protects a multi-camera calibration method based on the minimum optical path principle and a transparent glass calibration plate and is applied to the fields of visual detection and image measurement. According to the method, the transparent glass plate is utilized to complete calibration of multiple cameras. The whole multi-camera calibration process comprises a first stage, whereinthe visual field of each camera is carefully adjusted to meet the requirement that identical covered regions exist between every two cameras; a second stage, wherein a Zhang Zhengyou calibration method is utilized to obtain internal parameters of the cameras; a third stage, wherein a pin-hole imaging model and a refraction projection model are used to acquire external parameters of the cameras infront of the calibration plate and external parameters of the cameras behind the calibration plate respectively; and a fourth stage, wherein the external parameters of all the cameras are unified under the same coordinate system. Compared with the prior art, by the adoption of the multi-camera calibration method based on the minimum optical path and the transparent glass calibration plate, calibration of multiple cameras in the system can be completed at the same time, and accuracy and reliability are improved.

Description

technical field [0001] The invention belongs to the field of visual detection and image measurement, and in particular relates to a multi-camera calibration method used in a multi-camera measurement system. Background technique [0002] Typically, the measurement of size, shape and deformation is a dynamic process. Since the method of using multiple cameras to simultaneously capture the surface of an object from different perspectives (one image acquisition) and dynamically reconstruct the shape of the entire object has many application scenarios in the fields of visual inspection and image measurement, this method has been extensively studied. In precision measurement, the calibration of multi-camera systems has always been a key step in multi-camera applications. Researchers have proposed many different methods and applied them to different fields. Xu et al. [1] proposed a new calibration method for internal and external parameters of a multi-camera network by using plan...

AI Technical Summary

Problems solved by technology

The special calibration plate needs precision manufacturing, but there is a problem that the calibration patterns on both sides cannot be precisely aligned, which makes the manufacturing accuracy difficult to control, which will affect the accuracy of the calibration results

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