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The Research on Mini-size Precision Measurement Based on Image Analysis

Author: XiaRuoAn
Tutor: ZhuLi
School: Hunan University
Course: Software Engineering
Keywords: Image Measurement Technology CCD Edge Detection Sub-pixel subdivision
CLC: TP391.41
Type: Master's thesis
Year: 2005
Downloads: 349
Quote: 15
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Abstract


Measure the development of the technology , marks a country's level of science and technology in a certain extent . Now, with the production and the rapid development of science and technology , the accuracy of the the tiny size measurement method , measurement efficiency as well as measuring the degree of automation increasingly high requirements . Therefore , to study how to improve the measurement accuracy of the tiny size has become an issue of practical significance . In this paper, based on the existing image measurement technology theory , amount to the small size of the block as experimental subjects , from exploration and research to improve the accuracy of the method of the tiny size parameter measurement software algorithms . The first study involves image processing technology - image filtering , edge detection technology in-depth analysis and research , and on this basis a feasible method for this topic . In the image filtering , first a source of image noise the pulse interference noise appearing in the image , by using a median filtering techniques , it eliminate impulse noise while maintaining edge details of an image ; at the edge of the preliminary detection of a Sobel operators combine non-maxima suppression technique to remove local maxima , reached the level of the pixel level image edge positioning . And using Sobel operator smoothing effect of the residual noise in the calculation process , the calculation results are more stable and accurate . The accurate positioning of the edge of the image , is to further improve the key to the accuracy of the image measurement . Detailed discussion of the sub- pixel edge segmentation algorithm , the structural design of a Gaussian curve fitting interpolation principle edge segmentation algorithm , to further improve the measurement resolution of the CCD camera . In order to verify the accuracy of the measurement algorithm is given at the end of the article , the experimental results to measure the amount of small size blocks image measurement repeatability of results measurement accuracy of 0.1 pixels , indicating that the measurement algorithm design success achieved fairly good results.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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