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The Defects Inspection And Recognition Of Crystal Oscillator

Posted on:2005-07-11Degree:MasterType:Thesis
Country:ChinaCandidate:B LiFull Text:PDF
GTID:2168360122492248Subject:Precision instruments and machinery
Abstract/Summary:PDF Full Text Request
This paper mainly studies how to use image processing techniques to recognize the defect of crystal oscillator.Digital image processing is originated from 20's twenty centuries. It has been the outstanding field in industrial automation through decades' development. Traditional measurement and recognition methods are being substituted by image measurement and image recognition gradually. Still, there are no image processing system for general measurement purpose. Usually, people choose specific experiment schedule to different situation. Three aspects are mainly discussed in this paper.First part, the fundamental theory of digital image processing. This part introduces the fundamental theory of image processing that related to the subject, including image digitalization (quantization and sampling) ; image enhancement and smoothness, introduce histogram enhancement, grayscale transformations, filtration and sharpening; image segmentation and edge detection; image geometric transformations; image properties and understanding.Second part, the structure of digital image processing system. This part mainly introduces the compositions of varieties image processing system.Third part, image recognition of crystal oscillator defects. This is the main body of this paper. Ordinarily, there are four types of defects of crystal oscillator ,such as, fill insufficient, bubble, heave and out of order leg. For inspecting the defects of crystal oscillator on industrial spot, we get the general character of crystal oscillator by traditional method - eyeballing, then classify the sample of defects image captured by computer system. After pre-processing each kind of defects, we pickup the characters of defects and recognize it. This part includes: hardware of experiment system; experiment method (mainly illumination schedule) and the image processing schedule.
Keywords/Search Tags:image processing, image recognition, image pre-processing, defect recognition, crystal oscillator.
PDF Full Text Request
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