Light spot image center quick locating method

A technology of spot image and positioning method, applied in the field of image processing, can solve the problems of weak anti-interference ability, inapplicable center of gravity method, and complicated calculation of two-dimensional Gaussian surface function, so as to improve the calculation speed, facilitate hardware implementation, and reduce hardware resources. effect used

Active Publication Date: 2013-05-08
安徽欧泰祺智慧水务科技有限公司
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AI Technical Summary

Problems solved by technology

Surface fitting based on gray level uses Gaussian surface to fit the gray level distribution of the target spot image, but the calculation of the commonly used two-dimensional Gaussian surface function is more complicated. Therefore, the center of gravity method is simpler to implement and has higher positioning accuracy. , becoming the most used targeting method
Although the center of gravity method has a wide range of applications, this method requires a relatively uniform distribution of spot images and good image symmetry, otherwise large errors will occur and the anti-interference ability is weak
In addition, especially for the case where the center point of the spot is not on the detection plane, the center of gravity method is usually not applicable

Method used

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  • Light spot image center quick locating method

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Embodiment Construction

[0024] The present invention, that is, a fast positioning method for the center of a spot image, comprises the following steps:

[0025] Step 1: Obtain the gray level distribution I(x, y) of the spot image by measurement;

[0026] Step 2: Randomly select a point on the spot image, assuming it is M, and calculate the gradient of the point

[0027] ▿ I ( x , y ) | M = ( ∂ I ( x , y ) ∂ x | M , ∂ I ( x , y...

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Abstract

The invention relates to a light spot image center quick locating method which is characterized by comprising the steps that (1) gray level distribution I (x, y) of a light spot image is acquired through measurement; (2) a point on the light spot image is selected randomly, gradient of the acquired point is computed; (3) a straight line which passes through the point and a light spot center is computed; (4) N points are selected randomly, N is larger than or equal to 2, the step (2) and the step (3) are repeated, linear equations of the acquired straight line passing through the light spot center are combined to an equation set; (5) the equation set is solved through a least square method, and the position (x0, y0) of the light spot center is acquired. According to the light spot image center quick locating method, a small number of points are selected randomly to quickly locate the light spot center, real-time performance is high, storage amount is small, hardware implementation is convenient, and center location can be achieved on the condition that light spot images are distributed unevenly.

Description

【Technical field】 [0001] The invention relates to a fast positioning method for the center of a spot image, belonging to the field of image processing. 【Background technique】 [0002] Spot images are widely used in machine vision, pattern recognition, optical measurement and other fields. The spot center is the feature of the spot image, which can be applied to target tracking in machine vision, feature point extraction in visual inspection, star point positioning of star sensor for attitude measurement components, and zero-order diffracted light positioning in laser diffraction particle size measurement, etc. Many occasions. [0003] At present, the localization methods for the spot center can be mainly classified into two categories: localization methods based on grayscale and localization methods based on edges. Among them, the grayscale-based positioning method uses the gray-scale distribution information of the target spot image for positioning, and the typical method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32
Inventor 曹章徐立军辛蕾魏天啸
Owner 安徽欧泰祺智慧水务科技有限公司
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