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A calibration template and a method for rapidly calibrating external parameters of a camera

A technology of external parameters and templates, applied in image data processing, instruments, calculations, etc., can solve problems such as complex and inefficient algorithms, and achieve the effect of simple algorithm, improved accuracy, and improved correction speed and accuracy.

Active Publication Date: 2019-04-26
OMNIVISION TECH (SHANGHAI) CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of complex and inefficient follow-up algorithms in the prior art using templates such as checkerboards and shooting 10 or 20 pictures at different angles of the camera, and to provide a calibration template

Method used

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  • A calibration template and a method for rapidly calibrating external parameters of a camera
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  • A calibration template and a method for rapidly calibrating external parameters of a camera

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Embodiment Construction

[0056] The core idea of ​​the present invention is to solve the problem in the prior art that multiple pictures need to be taken to calibrate the external parameters of the camera in different axes of x-axis, y-axis and z-axis, and provide a solution, which has a simple algorithm and improves The speed and accuracy of subsequent algorithms.

[0057] In order to realize the above idea, the present invention provides a calibration template, a calibration template for calibrating the external parameters of the camera, characterized in that the calibration template includes three calibration surfaces; the three calibration surfaces intersect perpendicularly in pairs At an intersection point, three intersection lines are formed; each calibration surface is provided with a calibration original image, and the line segment where the calibration original image intersects with the two intersection lines on the corresponding calibration surface is the calibration Two edge lines of the or...

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Abstract

The invention provides a calibration template. wherein the calibration template comprises three calibration surfaces which are completely the same and are vertically intersected in pairs; the calibration surface is provided with a calibration graph consisting of a plurality of squares with the same size; The invention also provides a method for rapidly calibrating the external parameters of the camera based on the calibration template, and the method can rapidly and effectively detect the rotation angles of the camera in x-y-z different axial directions on the basis of the rotation angle of the sideline and / or the reference line on the calibration template on the calibration picture. the method provided by the invention only needs to take one correction photo, and the algorithm is simple;Furthermore, the correction speed and the algorithm speed are improved; Furthermore, the precision of a subsequent algorithm is improved.

Description

technical field [0001] The invention relates to the technical field of image shooting, in particular to a method for quickly calibrating external parameters of a camera. Background technique [0002] Because of its advantages of intuitiveness, realism and convenient dissemination, images and video screens have gradually become the most important tools and means for people to record information and communicate. With the comprehensive and rapid development of camera technology, the application of cameras is becoming more and more extensive, such as mobile phone camera, digital camera camera and traffic monitoring camera, etc. In all aspects, at the same time, people's requirements for the imaging quality of cameras are getting higher and higher. [0003] As we all know, if the lens of the camera rotates a lot, the photos taken will be deformed or rotated, which will greatly affect the quality of the photos. Therefore, the accuracy of the camera parameter calibration results d...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/80
CPCG06T7/80G06T7/97
Inventor 杨勇刚王家福
Owner OMNIVISION TECH (SHANGHAI) CO LTD
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