Abstract
This paper introduces a new image acquisition scheme based on the principle of internal reflection for the inner wall of the small hole, and visually inspects small hole workpieces with an inner diameter of 2-10mm. The customized reflector is inserted into the small hole, and the internal wall image is displayed in the CCD industrial camera through the reflection of light, and then the subsequent image processing is performed. The feasibility of the scheme is verified by theoretical calculations, and the obtained inner wall image resolution can reach 10 μm, which has high practical value.
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