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A Visual Processing Method for Aperture Measurement

A processing method and aperture technology, applied in the field of visual measurement, which can solve the problems of high accuracy, large amount of calculation of second-order differential operators, and easy to be affected by noise.

Active Publication Date: 2021-07-06
WUHAN PATRON DIGITAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first-order differential operator has poor precision and is easily affected by noise
The second-order differential operator is computationally intensive, time-consuming, inefficient, and highly accurate

Method used

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  • A Visual Processing Method for Aperture Measurement
  • A Visual Processing Method for Aperture Measurement
  • A Visual Processing Method for Aperture Measurement

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Experimental program
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Embodiment Construction

[0051] The technical solutions of the present invention will be further specifically described below through examples.

[0052] A visual aperture measurement processing method for moving fitting edge finding includes image thresholding, row and column moving sinusoidal fitting, equiangular radial moving sinusoidal fitting, and least squares circle fitting; the scheme block diagram is as follows figure 1 Shown:

[0053] The thresholding process: use an industrial camera to shoot the small holes in the real object to obtain the original picture. Then select a threshold value of 30 to binarize the collected image. If the gray value of the pixel point is less than the threshold value, set the gray value of the pixel point to 0, otherwise set it to 255. The result is as figure 2 Shown:

[0054] The row and column moving sine fitting: use the least square method sine fitting to process the data, assuming that the fitting model of the data to be fitted is:

[0055] x i =Acos(Δ ...

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Abstract

The invention relates to a visual processing method for aperture measurement. Firstly, the aperture picture is taken by the camera, and the captured image is thresholded with a certain threshold to obtain a threshold image. Secondly, apply the row (or column) moving sine fit to find the largest column (or row) edge of the aperture, and determine the initial center coordinates and initial diameter. Taking the initial center of the circle as the origin of the coordinates, moving the sinusoidal fitting at equal intervals along the radial direction with the origin of the coordinates as the starting point, wherein the width of the sinusoidal fitting is not greater than the radius, and the length of the moving fitting is not less than the initial diameter. In the radial moving sinusoidal fitting process, the gray value of each equivalent pixel point in the radial direction is calculated using the algorithm of four-point gray weight interpolation. The hole edge is determined radially at each angle by calculation of the zero point of the sinusoidal movement fit. The aperture size is then calculated by the least squares circle fitting method and the pixel size calibration value. Compared with other measurement methods, the invention has the advantages of high precision, strong anti-interference ability and fast measurement speed.

Description

technical field [0001] The invention belongs to the technical field of visual measurement, and in particular relates to a visual aperture measurement processing method for sinusoidal movement fitting edge finding Background technique [0002] Vision measurement is a non-contact measurement technique. It takes the image as the information carrier, extracts useful signals from the image, and obtains various parameters required by processing the measured image. In traditional automated production, the typical method of dimension measurement is to use tools such as micrometers, vernier calipers, and feeler gauges to measure. However, these measurement methods have low measurement accuracy and slow speed, which cannot meet the needs of large-scale automated production. [0003] Instruments and equipment based on visual measurement technology have the characteristics of full field of view measurement, high precision and high degree of automation. They can realize intelligence, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/12G06T7/13G06T7/136G06T7/62G06T7/90G06F17/16
CPCG01B11/12G06F17/16G06T2207/10024G06T2207/30108G06T7/13G06T7/136G06T7/62G06T7/90
Inventor 王选择程斌刘武平翟中生杨练根周向东王佳雯
Owner WUHAN PATRON DIGITAL TECH CO LTD