Threshold-free oblique incidence laser spot center positioning method

A laser spot and center positioning technology, applied in the field of image processing, can solve the problem that the spot positioning may not be the same, and achieve the effect that the algorithm is simple and easy to understand and easy to implement.

Active Publication Date: 2019-11-15
HOHAI UNIV CHANGZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is not easy to find a suitable segmentation threshold, and the thresholds required for different spot positioning may not be the same
At the same time, due to the influence of noise interference, it brings more challenges to the accurate estimation of the threshold

Method used

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  • Threshold-free oblique incidence laser spot center positioning method
  • Threshold-free oblique incidence laser spot center positioning method
  • Threshold-free oblique incidence laser spot center positioning method

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Experimental program
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Effect test

Embodiment

[0059] Obtaining the spot image is to obliquely inject a non-circular laser spot from one direction, such as figure 1 As shown in , the white bright spots outside it are salt and pepper noise. In this embodiment, a 9*9 median filter is used to remove noise and smooth the curve. The following formula is the gray value matrix before and after median filtering of the 9*9 matrix where the position is (7, 32):

[0060] Before filtering:

[0061] After filtering:

[0062] The image obtained after smoothing is as follows figure 2 shown.

[0063] Through step 2, the position set of the maximum gray value point in the area where the incident point is located is obtained, and the average value of the positions is calculated to obtain the coordinate (328, 444) of the incident point A.

[0064] Through step 3, the point sets B={B1, B2,..., Bn}, C={C1, C2,..., Cn} and D={D1, D2,..., Dn} are obtained. Calculate the slope of the connection line between all points in the set D and ...

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Abstract

The invention relates to the field of image processing, and discloses a threshold-free oblique incidence laser spot center positioning method, including the steps: for a non-perfect circle laser spotobliquely incident from a certain direction, carrying out smoothing processing on the non-perfect circle laser spot to determine an incident point and an incident direction; extracting position coordinates of an intersection point with the aperture on a straight line where the incident direction is located, and averaging the position coordinates to obtain different aperture center positions; and finally, counting central positions of all apertures, and averaging to obtain a light spot center. The threshold-free oblique incidence laser spot center positioning method does not need to set a threshold value, is suitable for solving the positioning problem of light spots obtained through irradiation of laser obliquely entering from any direction, and is high in precision and easy to implement.

Description

technical field [0001] The invention relates to a method for locating the center of an obliquely-injected laser spot without a threshold, and belongs to the field of image processing. [0002] technical background [0003] The spot center localization problem has a very important application in the field of optics. In recent years, spot centering methods have been greatly improved in terms of accuracy. However, most of the traditional spot center positioning algorithms are aimed at symmetrically distributed perfect circular spot images, which require the light source to be emitted perpendicular to the surface of the object. For the non-uniform non-circular spot generated by obliquely entering the light source from one direction, there are few center positioning methods, but this The center positioning of the equal spot has many applications in the oblique incident diffuse reflectance experiment. [0004] In addition, most of the traditional spot center positioning methods n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/62G06T7/77G06T5/00
CPCG06T7/62G06T7/77G06T5/002G06T2207/20032
Inventor 黄施羽江金芳韩光洁
Owner HOHAI UNIV CHANGZHOU
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