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Research on image registration algorithm printed circuit board visual inspection machine

Author: ChenZuo
Tutor: YeYuTang
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: image acquisition image registration Gaussian pyramid feature matching
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 1
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Abstract


With the development of printed circuit board industry, standard of the printed circuit board appearance testing has been more and more stringent, and manual inspection has been challenged. Printed circuit board appearance inspection machine has played a key role in circuit board industry. Image registration algorithm is a key technology for visual inspection of printed circuit boards; the registration results directly affect accuracy of detection.Firstly, in this dissertation, the image acquisition system of printed circuit board appearance inspection machine was discussed, and a double buffer asynchronous image acquisition scheme based on ActiveMil was proposed that can efficiently capture and real-time stitch image. Secondly, the merits and application of common image registration algorithm were analyzed, according to the features of image acquired by printed circuit board appearance inspection machine that are regular imaging and obvious feature information, a mixture image matching algorithm based on Gaussian based for the pyramid was presented. As different with image registration algorithm the traditional, this algorithm combines the affine transform, Gaussian pyramid, the improved Canny edge extraction operator and improved Hausdorff distance-based similarity for image registration, and experimental results show that matching algorithm registration accuracy has been increased. Finally, two image preprocessing program were designed, using Gerber file to establish the standard image templates, and cubicle chromatic aberration correction, and experimental results show that the accuracy and efficiency of registration algorithms have been optimized.The image acquisition based on ActivelMil in the .net platform has been widely applied to the fields of medical image acquisition, but had not been reported that has been used in printed circuit board appearance inspection machine, and to our knowledge, Gaussian pyramid-based image registration algorithm is applied to printed circuit board appearance inspection machine have not been reported in the country.

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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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