An automatic detection method for the quality of pen core

Abstract

The invention relates to an automatic detection method for pen refill quality. The method comprises: (1), acquiring a digit image of a stitch circle; (2), performing scattering Hough transformation on the acquired image: first of all, randomly selecting N points on the whole image, N being taken from 40 to 80, by respectively taking each point as a reference point, drawing a horizontal line and a vertical line, and then performing the scattering Hough transformation on the point on the two lines; the scattering Hough transformation involves transforming a two-dimensional image domain to a parameter domain on the two lines, expressing a circle center coordinate (x, y) and a radius by three parameters c1, c2 and c3, then (x-c1)<2>+(y-c2)<2>=c3<2>; and since the radius is approximately known, updating the accumulation voters of the corresponding parameter values of the c1 and the c2 only according to pixel points, and obtaining the estimation values of the two parameters of the point; (3), integrating the scattering Hough transformation results of the plurality of points to obtain the estimation results of the circle center and the radius; (4), performing edge detection based on evidence accumulation to obtain data of stitch width; and (5), after slide average processing is carried out, making a final judgment about the pen refill quality according to the results.

Description

technical field [0001] The invention belongs to the field of stationery manufacture and detection, in particular to an automatic detection method for the quality of a pen core. Background technique [0002] At present, the automatic quality inspection of pen refills in my country's pen industry is still blank. A large number of pen manufacturers use manual quality inspection methods, which is inefficient, and in the case of increasing labor costs, enterprises bear a huge economic burden. Contents of the invention [0003] The purpose of the present invention is, in order to realize the automatic detection of the quality of the pen core, utilize the camera to photograph the circle trace drawn by the pen core to be tested, thereby propose an automatic detection method of the quality of the pen core. [0004] The recognition of circular contours in images has important applications in image processing and other fields, and Hough transform provides us with an effective solutio...

AI Technical Summary

Problems solved by technology

[0002] At present, the automatic refill quality inspection in my country's pen industry is still blank, and a large number of pen manufacturers use manual quality inspection methods, which are inefficient, and in the case of increasing labor costs, enterprises bear a huge economic burden

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