Mirror-like object surface optical imaging device and imaging method thereof

Abstract

The invention discloses a mirror-like object surface optical imaging device and an imaging method thereof. The device comprises a parallel light source, a grating, a camera, a computer and a light source controller for controlling the parallel light source. The camera is connected to the computer. The parallel light source and the grating cooperate to generate a non-uniform light source with light and dark stripes. According to refraction and reflection principles of light, by moving the non-uniform light source, the light and dark stripes can scan the total surface of a scanned object, and the camera is employed to acquire a same position on the object surface continuously in a movement period so as to obtain series of pictures, and subjecting the series of pictures to morphological dilation treatment, and then synthesizing a final target pictures. The device and the method provided by the invention solve the unable imaging problem due to too small mirror-like object surface defects and high reflections, and mirror-like object surface micro-defects and a background can form significant contrast, the noise is small, the gray value difference is great, and defect segmentation can be easy.

Description

technical field [0001] The invention relates to the field of machine vision light sources and optical imaging, in particular to an optical imaging device and an imaging method for a mirror-like object surface. Background technique [0002] After decades of development, machine vision has brought a new solution to industrial automation and is widely used in quality inspection in industrial manufacturing processes. The combination of machine vision technology and industrial automation has resulted in visual inspection technology. The most critical step in visual inspection is to choose the correct optical imaging solution. Targeted light source illumination and imaging methods therefore become extremely important. [0003] There have been many optical imaging solutions for surface defects of mirror-like objects (such as glass, plastic, metal workpieces, etc.), among which the phenomenon of suppressing strong reflection from the aspect of physical imaging is the main one. Th...

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Problems solved by technology

[0006] The object of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, provide an optical imaging device and imaging method for the surface of a mirror-like object, and effectively solve the problem that the surface defect of the mirror-like object is too small and highly reflective and cannot be imaged. Make the small defects on the surface of the mirror-like object have obvious contrast with the background, the noise is small, the gray value difference is large, and the defect segmentation is easy

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