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Straight line measuring method

A measurement method and straight line technology, applied in image data processing, instruments, calculations, etc., can solve problems such as inability to obtain corrections, large straight line errors, etc., to reduce the number of times and improve search efficiency.

Pending Publication Date: 2019-10-18
HANGZHOU HUICUI INTELLIGENT TECH CO LTD +2
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Problems solved by technology

Although this method can avoid the influence of a small number of interference points, when there are many interference points, the error of the straight line generated by the first fitting (based on the least squares method) is large, and may not be corrected in the subsequent iterations, such as image 3 As shown, the solid line is the fitted straight line, and the dashed line is the ideal straight line

Method used

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Embodiment

[0035] Embodiment: a kind of linear measuring method, as Figure 4 As shown, the main process of this method includes: edge point extraction, Hough space transformation, finding straight line intersection points in Hough space, clustering and segmentation, screening out candidate edge points, and performing straight line fitting on candidate edge points.

[0036]In this method, the Canny edge extraction method is selected to obtain the single-pixel edge of the target to be tested. Among them, the Sobel operator is used to calculate the gradient in the image, and the gradient amplitude is normalized to the range of 0-255. The Canny edge extraction method is a dual-threshold extraction method, which needs to set a high threshold t H and a low threshold t L . In this patent, setting t H =2*t L , and 0≤t L , t H ≤255.

[0037] Hough line transform is performed on the extracted edge points. Such as Figure 5 , in the Cartesian coordinate system oxy, any point (x j ,y j ...

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Abstract

The invention discloses a straight line measurement method, which is characterized by mainly comprising the steps of edge point extraction, Hough space transformation, solution of straight line intersection points in a Hough space, clustering segmentation, screening of candidate edge points and straight line fitting of the candidate edge points. According to the clustering straight line fitting method based on the Hough space, the influence of interference points can be restrained, high-precision straight line fitting is achieved, and the straight line fitting problem under many interference points is solved.

Description

technical field [0001] The patent of the present invention belongs to the field of machine vision measurement, which mainly uses a camera to photograph the object to be measured, and uses an image processing algorithm to obtain the required measurement information. At present, it is mainly used in precision workpiece measurement (such as workpiece straightness, size, etc.), target non-contact measurement in complex industrial scenes (distance measurement, tilt angle measurement) and other fields. Background technique [0002] Machine vision measurement refers to the method of using the camera to obtain the image of the object to be measured, and combining the image processing algorithm to measure the geometric information of the target to be measured. This method has the characteristics of non-contact and high precision. In order to obtain ideal measurement results, the industry mainly guarantees through three aspects, namely: undistorted and clear target images, accurate s...

Claims

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Application Information

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IPC IPC(8): G06T7/12G06T7/13G06T7/136G06T7/168G06T7/62G06T5/20
CPCG06T7/13G06T7/12G06T7/136G06T7/168G06T7/62G06T5/20G06T2207/20061
Inventor 周柔刚周才健
Owner HANGZHOU HUICUI INTELLIGENT TECH CO LTD
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