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Research on workpiece elliptical contour detection method

An ellipse detection, ellipse technology, applied in the field of image processing, can solve problems such as large amount of calculation

Inactive Publication Date: 2017-09-29
JIANGNAN UNIV
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Problems solved by technology

The accuracy and speed of the algorithm depend on the proportion of points that fit the model. If the proportion of points used to fit the ellipse is small, the number of random sampling will be large, so the amount of calculation will be large

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  • Research on workpiece elliptical contour detection method
  • Research on workpiece elliptical contour detection method

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Embodiment Construction

[0019] The embodiments of the present invention will be described in detail below. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation methods and processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0020] First, the required midpoint of the parallel chord of the ellipse, and the specific steps to obtain the midpoint of the parallel chord of the ellipse are as follows:

[0021] The first step is to use the Sobel operator to detect the edge of the preprocessed ellipse image to obtain the edge contour information. Let the edge detection image be I 1 , I 2 Blank image for initialization.

[0022] In the second step, the image I 1 When performing progressive scanning, find two points of the ellipse contour in each row, connect the two points to obtain the midpoint of the horizontal chord, and store the coordinates of the midpoint in the im...

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Abstract

The shape of a space circle is projected to a plane to form an ellipse under photographing of a single camera in the process of binocular visual measurement of an arc workpiece. The edge of the arc has certain notches or defects so that correct fitting of the ellipse and eliminating the edge error points have a significant impact on correct matching of the subsequent points and solving of the space circle radius. Fitting of multiple straight lines is performed by using an improved RANSAC algorithm to obtain the center point of the ellipse based on Hough transformation. Meanwhile, voting of the remaining three parameters is performed on the symmetry point of Hough transformation by using the symmetry of the ellipse so as to reduce the computational burden and enhance the accuracy. Finally, the feasibility of the method is verified by the experiment.

Description

technical field [0001] The present invention relates to a method in the technical field of image processing, specifically an ellipse that uses an improved RANSAC algorithm to fit multiple straight lines to obtain the center point of an ellipse on the basis of Hough transform, and then performs dimensionality reduction to reduce the amount of calculation. Detection method. Background technique [0002] In industrial production, many workpieces have round or elliptical shapes. In the process of binocular vision measurement, the shape of the space circle is captured by a single camera and projected onto a plane to form an ellipse. The detection of the ellipse has an important impact on the correct matching of subsequent points. The direct least squares method is an effective method for ellipse detection based on parameter fitting. This method has high ellipse fitting accuracy for ideal data points. However, it is very sensitive to noise and cannot detect multiple ellipses in o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13
CPCG06T7/13G06T2207/30164
Inventor 化春键熊雪梅
Owner JIANGNAN UNIV
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