2 February 1998 Machine vision system for inner-wall surface inspection
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A non-contact laser sensor based on the circular optical cutting image is developed to measure the size and the profile of the pipe inner wall. The sensor consists of a laser diode light source, an optical ring pattern generator and a CCD camera. The circular light from the optical ring pattern generator projects onto the pipe inner wall, which is then viewed by the CCD camera. The adapt weighted average value filter and subpixel technique in several step computing and half Gauss fitting are put forward to obtain the edge and the center of the circular image in order to filter the noise of the image and raise the resolution of the measuring system. The experimental results show that the principle is correct and the techniques are realizable.
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Bao Hua Zhuang, Bao Hua Zhuang, Wenwei Zhang, Wenwei Zhang, } "Machine vision system for inner-wall surface inspection", Proc. SPIE 3306, Machine Vision Applications in Industrial Inspection VI, (2 February 1998); doi: 10.1117/12.301240; https://doi.org/10.1117/12.301240

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