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A high-precision sub-pixel circular part measuring method

A technology of round parts and measurement methods, which is applied in the directions of measuring devices, image enhancement, image analysis, etc., can solve the problems of easy fatigue, high strength, high cost, etc., and achieve the effects of avoiding easy fatigue, enhancing robustness, and improving efficiency

Active Publication Date: 2018-12-14
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a high-precision sub-pixel circular part measurement method, which greatly improves the detection speed and accuracy of circular parts, thereby improving the efficiency of part detection and avoiding the The disadvantages of fatigue, high cost, and high strength brought about by traditional manual inspection

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  • A high-precision sub-pixel circular part measuring method
  • A high-precision sub-pixel circular part measuring method
  • A high-precision sub-pixel circular part measuring method

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0037] Such as Figure 1~6 As shown, a high-precision sub-pixel circular part measurement method includes the following steps:

[0038] Step 1, obtain the original image of the circular part, such as figure 2 shown;

[0039] Step 2, binarize the original image obtained in step 1, such as image 3 As shown, and then use the findContours algorithm to find the contour of the binarized image, and then filter out the circular contour that meets the measurement needs by setting the maximum and minimum values ​​of the contour area, and then obtain the maximum value of the circular contour The lower circumscribed rectangle, so as to obtain the ROI image of the area where the circle to be measured is located, such as Figure 4 As shown, this operation can reduce the image, s...

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Abstract

The invention discloses a high-precision sub-pixel circular part measuring method, which comprises the following steps: step 1, obtaining the original drawing of the circular part; step 2, binarizingthe original image obtained in the step 1, and then finding the contour of the binary image by using findContours algorithm, then, by setting the maximum and minimum value of the contour area, selecting the circular contour which meets the measurement needs, and obtaining the lowest circumscribed rectangle of the circular contour so as to obtain the ROI image of the region where the circle to be measured is located. The invention greatly improves the detection speed and the detection precision of the circular part, thereby improving the detection efficiency of the part and avoiding the shortcomings of easy fatigue, high cost, high strength and the like caused by the traditional manual detection.

Description

technical field [0001] The invention relates to the technical field of machine vision measurement, in particular to a method for measuring a high-precision sub-pixel circular part. Background technique [0002] In daily life and automated industrial production, the demand for circle detection continues to increase, and the detection accuracy required is getting higher and higher. It is an important part of visual inspection to accurately and quickly detect the position of the circle in the image and obtain the geometric parameters of the circle. An important task; with the wide application of computer vision in the field of image detection, the positioning accuracy of the edge in the image directly affects the detection accuracy of the vision system; classic integer pixel algorithms, such as the commonly used Sobel operator, Krisch operator, Prewitt operator, Roberts operator, and Canny operator, etc. Although these edge detection technologies are fast, they can only determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T3/40G06T3/00G01B11/24
CPCG06T3/4007G06T7/0004G01B11/24G06T2207/20104G06T3/02
Inventor 王晗李逸林灿然张芳建白羽鹏
Owner GUANGDONG UNIV OF TECH
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