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Rapid positioning and roundness detection method for circle center of circular hole of aeronautical part

A detection method and circular hole technology, which are applied in image data processing, instruments, calculations, etc., can solve the problems of high cost, low manual measurement efficiency, poor accuracy, etc., and achieve the goal of reducing resource requirements, saving computer memory, and reducing computing time. Effect

Inactive Publication Date: 2020-12-25
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] , its purpose is to quickly locate the center coordinates of the circular holes of aviation parts and complete the detection of roundness, so as to solve the problems of low efficiency, high cost and poor precision of existing manual measurement

Method used

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  • Rapid positioning and roundness detection method for circle center of circular hole of aeronautical part
  • Rapid positioning and roundness detection method for circle center of circular hole of aeronautical part
  • Rapid positioning and roundness detection method for circle center of circular hole of aeronautical part

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Embodiment Construction

[0031] A method for detecting a round hole of an aviation part according to the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Step 1: Use the original round hole image captured by the CMOS industrial camera to collect the image through the image acquisition card and transmit it to the industrial computer. After the camera captures the round hole image, the acquisition card compresses the analog signal of the original round hole image into a digital signal recognized by the computer transferred to computer memory, such as figure 2 Shown is a camera image of a hole displayed on a computer screen.

[0033] Step 2: In the process of image acquisition, various noises will be introduced due to the influence of sensor material properties and working environment, which will reduce the image quality of the round hole image and further affect the acquisition of image edge information to varyi...

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Abstract

At present, most domestic institutions adopt a manual measurement method for round hole circle center positioning and roundness detection of aeronautical parts, and in the measurement process, the measurement efficiency and measurement precision of observers greatly influence the subsequent working efficiency and precision. Along with wide application of machine vision, the manual measurement modebecomes increasingly unable to meet modern and efficient production requirements. The invention discloses a rapid positioning and roundness detection method for the circle center of a round hole of an aeronautical part. The method comprises the steps: 1, using a CMOS industrial camera for shooting a round hole image; 2, carrying out image preprocessing on the acquired circular hole image; 3, improving a Hough circle transformation fitting algorithm, and quickly and accurately obtaining the circle center coordinate and radius of the circular hole. and 4, evaluating the roundness error of the circular hole by adopting a minimum containment region method on the basis of obtaining the circle center coordinate and the radius of the circular hole. According to the invention, the improved Houghcircle transformation fitting algorithm, the minimum containment region method and the image preprocessing process are achieved through Python and OpenCV, and the positioning precision and efficiencyof the circle center of the circular hole are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of industrial computer software image processing, and specifically relates to a [0002] Rapid positioning and roundness detection method of circular hole center of aviation parts. Background technique [0003] With the development of my country's aerospace field and the advent of the era of intelligent manufacturing, the requirements for the rapid positioning of the center of the circular hole of aviation parts and the accuracy and efficiency of roundness detection are getting higher and higher. The accuracy and efficiency determine the speed of finished aircraft manufacturing. and quality. At present, there are still a certain scale of circular holes in aviation parts that rely on manual measurement, and there are a series of problems such as low efficiency, high cost, and accuracy guaranteed by the level of workers. In view of these problems, the present invention proposes a method for fast positioning a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/66G06T7/64G06T7/62G06T7/11G06T7/136G06T7/13
CPCG06T7/66G06T7/64G06T7/62G06T7/11G06T7/136G06T7/13G06T2207/20061G06T2207/30164
Inventor 付鹏强苗宇航姜晓灿周丽杰王昭张广钿李鹏飞陈云
Owner HARBIN UNIV OF SCI & TECH
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