Imaging device for cigarette appearance visual detection machine

Abstract

The invention relates to an imaging device for a cigarette appearance visual detection machine. The imaging device comprises a camera module and an optical module, wherein the optical module is arranged between a cigarette and a lens of the camera module and used for forming two symmetrical imaging channels of the lens, the two imaging channels divide the cylindrical surface of the cigarette intotwo visual angles, the two visual angles are partially overlapped, the coverage areas of the two visual angles are not smaller than the half area of the cylindrical surface of the cigarette, and the camera module is used for forming a detection image with two visual angles through one-time shooting. Compared with the prior art, the imaging device achieves the effect that one camera achieves common-caliber imaging of two different line-of-sight directions on the basis of a novel confocal surface common-caliber visual field splitting principle, combined with integrated lighting, the applicationrange of the machine vision technology in the compact narrow space of different types of cigarette making machines is greatly expanded, and the imaging performance of the cylindrical surface of the cigarette is improved.

Description

technical field [0001] The invention relates to the fields of artificial intelligence and machine vision, in particular to an imaging device used for a cigarette appearance visual detection machine. Background technique [0002] Modern cigarette production has been highly automated and high-speed, and the production speed has reached more than 7,000 cigarettes / minute, or even 20,000 cigarettes / minute. Such a high-speed and complicated process of cigarette appearance and surface defects is unavoidable. Nowadays, it is basically difficult to find out the appearance quality of cigarettes by manual random inspection. Cigarettes with appearance defects. The rapid development of machine vision technology has made it possible to detect the appearance of cigarettes online. However, because the structure of the cigarette making machine is very compact and the space is small, and the outer surface of the cigarette is cylindrical, it is very difficult to add special machine vision insp...

AI Technical Summary

Problems solved by technology

But the existing method still has the following disadvantages: one, because there are two cameras in each camera assembly, it still occupies a large amount of effective space; In a normal direction plane of the smoke pillar surface, as the circumferential position of the surface is different, the angle between the surface normal and the optical axis of the imaging optical lens changes along the circumferential direction, gradually increasing from 0° from the center of the optical axis to both sides As large as 90°, it will cause a difference in the viewing angle of the imaging projection, resulting in image distortion

In addition, due to the existence of the radius of curvature of the tobacco cylinder, the imaging distance varies with the circumferential position of the surface, resulting in blurred images. Two cameras are required to image the semi-cylindrical surface of the cigarette, which increases the number of cameras and image processing. The cost of software and hardware; 3. The angle between the normal of different positions on the surface and the direction of light source irradiation, and the imaging line of sight along the circumference are also different, resulting in uneven illumination of the surface of the acquired image and uneven illumination of the camera image surface, resulting in image grayscale Unevenness; Fourth, the two detection pictures formed by the camera components need to be synthesized through post-processing and calculation of the software, which increases the complexity and time overhead of image processing

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