High-precision camera calibration method via low-precision 2D planar target

A two-dimensional plane, camera calibration technology, used in image analysis, image enhancement, instrumentation, etc., can solve the problem of high cost

Active Publication Date: 2016-09-07
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology

[0011] Aiming at the technical problem that the calibration method in the prior art needs to make a high-precision calibration plate, resulting in h

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  • High-precision camera calibration method via low-precision 2D planar target
  • High-precision camera calibration method via low-precision 2D planar target
  • High-precision camera calibration method via low-precision 2D planar target

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Embodiment Construction

[0040] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings of the specification.

[0041] The invention discloses a method for realizing high-precision camera calibration with a low-precision two-dimensional plane target, which specifically includes the following steps:

[0042] Step 1: Make a calibration board, such as image 3 As shown, it is assumed that there are a total of l control points on the calibration board, and the control point is the center of each circle. Take the center of the calibration plate as the origin, the horizontal right is the X axis, the horizontal downward is the Y axis, and the vertical calibration plate plane is the Z axis. The initial value of the coordinate of each control point in the world coordinate system is (X wi ,Y wi ,Z wi ), i=1, 2,...l (l≥8). Where Z wi All are initialized to 0. At the same time, accurately measure the distance between two control points wi...

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Abstract

The invention discloses a high-precision camera calibration method via a low-precision 2D planar target. The method comprises the steps that internal and external parameters, a lens distortion coefficient and the coordinates of control points in a world coordinate system are adjusted and optimized in a light beam method, and the object-point coordinates of the control points are optimized together in the parameter optimization process; and 2) after adjustment, two real distances in the surface of a calibration board and the adjusted distance are used to calculate a proportion factor, the proportion factor is multiplied by an adjusted translation vector to obtain a final value of a translation vector parameter, and calibration is completed. The object-point coordinates of the control points are optimized together two real distances of the control points are used to calculate the proportion factor between real coordinate and the calculation coordinates of the control points, distance between the translation vector calculated value and real value in the camera external parameter and the control point coordinate is eliminated, and the calibration precision for the translation vector in the external parameter of the camera is improved.

Description

Technical field [0001] The invention relates to camera calibration technology, in particular to a method for realizing high-precision camera calibration by using a low-precision two-dimensional plane target. Background technique [0002] In the field of machine vision measurement (such as binocular structured light measurement systems), the calibration accuracy of the camera has a greater impact on the final measurement accuracy. The calibration method based on a two-dimensional flat panel is a commonly used method at present. The method is simple to operate and only requires a two-dimensional flat panel to move several times in different directions in space. However, the calibration accuracy of this method depends on the manufacturing accuracy of the calibration plate, and the flatness of the two-dimensional plane is relatively high. In order to process high-precision calibration boards, hardware costs have risen sharply. [0003] The existing methods for realizing camera calibr...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T2207/30208
Inventor 袁建英蒋涛付克昌杨强黄小燕
Owner CHENGDU UNIV OF INFORMATION TECH
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