A method for detecting edge defects of bottle caps

Abstract

The invention discloses a bottle cap edge defect detecting method and detecting system. The bottle cap edge defect detecting system comprises a bottle cap, a camera and lighting sources, wherein the bottle cap is placed on a mounting face; the lighting sources are three point light sources of which the wavelengths are lambda 1, lambda 2 and lambda 3 respectively; the wavelengths lambda 1, lambda 2 and lambda 3 are not consistent within the visible light range; the three point light sources surround the bottle cap, are arranged at equal intervals of 120 degrees and light the bottle cap from the outside above the bottle cap; the camera is arranged over the bottle cap and is a color camera capable of receiving waves with the wavelengths of lambda 1, lambda 2 and lambda 3. According to the bottle cap edge defect detecting system, the three point light sources respectively with different wave lengths are adopted to light the bottle cap from the outside above the bottle cap, then the camera corresponding to the point light sources with different wavelengths is adopted to take pictures from the top down, and defects on the edge of the bottle cap can be detected conveniently through analysis on projections of the bottle cap.

Description

technical field [0001] The invention relates to a detection method and a detection system for edge defects of bottle caps. Background technique [0002] In the bottle cap detection system, there are two conventional imaging methods. The first one is to take an image from top to bottom. The image taken in this way can usually better identify whether the bottle cap is round, or whether the inside of the bottle cap is If there are features such as defects, but the edge of the bottle cap is defective, the defect will overlap with the normal edge on the projection of the shooting direction, so it will be difficult to show the defect, making it almost impossible to detect the defect. [0003] The second way is to shoot with a side view. If there is a V-shaped defect on the edge of the bottle cap closest to the camera, since the projected background is usually on the inner wall of the bottle cap or the bottom near the edge, and these areas are mainly It is the same material as the...

AI Technical Summary

Problems solved by technology

[0002] In the bottle cap detection system, there are two conventional imaging methods. The first one is to take an image from top to bottom. The image taken in this way can usually better identify whether the bottle cap is round, or whether the inside of the bottle cap is If there are features such as a defect, but the edge of the bottle cap is defective, then on the projection of this shooting direction, the defect overlaps with the normal edge, so it is difficult to show the defect, making it almost impossible to detect the defect

[0003] The second way is to shoot with a side view. If there is a V-shaped defect on the edge of the bottle cap closest to the camera, since the projected background is usually on the inner wall of the bottle cap or the bottom near the edge, and these areas are mainly It is the same material as the side surface, which leads to insufficient contrast between the defect and the background, and there is no way to detect the V-shaped defect

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