Fast circle measurement of industrial CT images based on existence probability |
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Authors: | LIU Feng lin and QIAO Gui feng |
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Institution: | (ICT Research Center, Chongqing University, Chongqing 400030, P.R. China);(ICT Research Center, Chongqing University, Chongqing 400030, P.R. China) |
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Abstract: | The general methods in reverse engineering cannot measure the inside of close parts. Traditional methods like Capture Geometrical Inside (CGI) would destroy the part. We used the industrial computer tomography (ICT) method to obtain accurate measurements of close parts. Based on the acquired computer tomography images, the size of an internal part was obtained through image measurement and subsequently edited, amended, and dimensioned in CAD software. First, the position and the pixel size of the circle were determined based on existence probability. Next, the actual size of one pixel was obtained based on the image size and the purview diameter. Finally, the actual circle size was calculated by multiplying the pixel size and the actual size of one pixel. A real part was measured using the method. The results show that the relative error of the measured circle radius and the actual size is less than 0.5% and the measuring time is several seconds. |
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Keywords: | reverse engineering non destructive testing existence probability computer tomography image measurement |
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