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Method and device for quick high precision positioning light spot image mass center

A spot image and centroid positioning technology, which is applied in the direction of optical devices, measuring devices, instruments, etc., can solve the problem of noise sensitivity in large data volume image preprocessing, improve anti-noise ability, high-precision positioning, and save data storage space Effect

Inactive Publication Date: 2007-06-27
BEIHANG UNIV
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Problems solved by technology

[0011] Another object of the present invention is to provide a fast and high-precision spot image centroid positioning device, which can solve the bottleneck problem and noise sensitivity problem of image preprocessing with a large amount of data in spot image centroid positioning, and can detect any number of spots of any size image processing

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  • Method and device for quick high precision positioning light spot image mass center
  • Method and device for quick high precision positioning light spot image mass center
  • Method and device for quick high precision positioning light spot image mass center

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Embodiment Construction

[0044] The basic idea of ​​the present invention is to firstly perform Gaussian filter processing on the pixel gray value of the output image, and then perform marking and calculation processing on each pixel of the output image at the same time, so that one or more than one spot images can be automatically identified and processing.

[0045] Here, the marking and calculation process specifically includes: comparing each output pixel, marking each spot pixel, and combining equivalent marks for different pixels in the same spot when necessary, so as to ensure that each pixel of the same spot Each pixel is given the same mark, and different spot pixels have different marks; while marking and merging, the gray value and coordinate value product of the same marked pixel are accumulated and the gray value is accumulated; after the output of the entire image data is completed, The cumulative value of the product of the gray value and the coordinate value of the same marked pixel is ...

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Abstract

The method includes steps: carrying out Gaussian convolution operation for gray scale value (GSV) of pixels; determining whether GSV of pixels after operation is larger than prearranged threshold value; if yes, marking current pixels, and recognizing relevant light spot, and calculating product of GSV of current pixel and coordinate value and accumulated value of products of GSV and coordinate values of all pixels in same light spot; saving the accumulated value; otherwise, marking current pixel as pixel in background. When accomplishing whole output image, the method calculates out quotient between accumulated value of product of GSV by coordinate value and accumulated value of gray scale value. The calculated result is as coordinate value of mass center of facula. The invention also discloses mass center positioning device. Advantages are: increasing speed for processing data and capability for anti noise, and capable of processing multiple facula images.

Description

technical field [0001] The invention relates to machine vision detection technology, in particular to a fast and high-precision spot image centroid positioning method and device. Background technique [0002] The spot image is common image information in machine vision and pattern recognition, and the center of the spot is the feature of the spot image. Spot center is widely used in target tracking in machine vision, feature point extraction of high-precision three-dimensional measurement in visual inspection, positioning of laser spot center in deep space laser communication for space applications, star point positioning of star sensor of attitude measurement components, Sun spot positioning for sun sensors. [0003] At present, the localization methods for the spot center can be divided into two categories: grayscale-based localization methods and edge-based localization methods. Among them, the grayscale-based positioning method generally uses the gray-scale distributio...

Claims

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Application Information

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IPC IPC(8): G01B11/00G01B11/03G01B21/00G01B21/04
Inventor 张广军江洁樊巧云郝雪涛
Owner BEIHANG UNIV
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