Positioning method of circle center projecting point of coplanar circles

A positioning method and projection point technology, which is applied in image data processing, instruments, calculations, etc., can solve the problem of complex processing of the real projection point of the center of the circle, and achieve the effect of simple method, good practicability, and improved processing efficiency

Inactive Publication Date: 2010-05-12
BEIHANG UNIV
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Problems solved by technology

[0006] In view of this, the main purpose of the present invention is to provide a method for positioning the projection point of the center of a coplanar circle, which can solve the problem of complex processing in the positioning of the real projection point of the center of the circle in the prior art

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  • Positioning method of circle center projecting point of coplanar circles
  • Positioning method of circle center projecting point of coplanar circles
  • Positioning method of circle center projecting point of coplanar circles

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Embodiment Construction

[0023] The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0024] The positioning method of the projected point of the center of the coplanar circle of the present invention, refer to figure 1 , the method mainly includes the following steps:

[0025] Step 101: Obtain a measurement image obtained by shooting a coplanar circle with a camera, perform edge extraction processing on the measurement image, and obtain ellipse edge points in the measurement image;

[0026] Here, the coplanar circles include two circles in the same plane; the measurement image can be obtained by placing the measured object in the measurement space of the monocular vision sensor, and then shooting the coplanar double circles by a camera.

[0027] The acquisition of the ellipse edge points of the measurement image can be realized by using the Hessian matrix method to perform edge extraction processing...

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Abstract

The invention discloses a positioning method of a circle center projecting point of coplanar circles, which constructs a quadratic curve according to an ellipse of the coplanar double circles on a camera image plane to obtain the characteristic value and the characteristic vector of the quadratic curve so as to obtain the perspective projection invariant point of the coplanar double circles and the structural parameters of the double circles, and utilizes the principle that anharmonic ratio is unchanged to determine the real projecting point of the circle center of the double circles on the image plane. The positioning method can determine the real projecting point of the circle center of the double circles without knowing any structural parameters of the coplanar double circles and can obtain the structural parameters of the double circles, and the method is simple and feasible and has better practicability and reliability.

Description

technical field [0001] The invention relates to a positioning technology in image processing, in particular to a positioning method for a projection point of a coplanar circle center. Background technique [0002] Since the ellipse projected by the circle on the image plane is defined by a large number of edge points, and the curve fitting process has a smoothing effect on the noise of the image points, the circle feature has a strong anti-noise ability, and the existing fitting algorithm can be used to Its parameters can be obtained precisely. The positioning of the projection point of the center of the circle is the basic task of the image processing process in the vision task. On the basis of the positioning of the projection point of the center of the circle, the camera calibration, relative position and attitude measurement, image measurement correction and some 3D functions related to the circle feature can be further completed. Image processing such as reconstruction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 张广军赵征魏振忠王巍
Owner BEIHANG UNIV
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