Container mouth inspection method and device

Abstract

The present invention enables accurate inspection of a defect at a start end of a screw of a glass bottle. An image of a container mouth portion is captured by a camera from above a container, a ring-shaped inspection gate is created on a ring-shaped screw image in the captured image, a dark section having a light / shade difference that exceeds a predetermined light / shade difference is searched for in the ring-shaped inspection gate, and a screw end inspection gate is created in a partial region of the ring-shaped inspection gate including the dark section. In the screw end inspection gate, a screw end image that pattern-matches a preregistered screw end registration image is searched for, and right / left portion inspection gates are created respectively in the partial regions of the ring-shaped inspection gates on both sides of the pattern-matching screw end. When a dark section having a light / shade difference and an area that exceed predetermined light / shade difference and area is detected in the right / left portion inspection gates, the dark section is determined as a defect.

Description

technical field [0001] The present invention relates to a method and device for inspecting the mouth of a container such as a glass bottle for checking whether there are defects (damages) in the threads and the top surface of the mouth, and more particularly relates to a container mouth inspection capable of inspecting containers being transported by a conveyor Methods and devices. Background technique [0002] Patent Document 1 below discloses a device for inspecting the threads of containers being conveyed by a conveyor. It is equipped with a reflector that reflects light from the outer peripheral surface of the container mouth and a camera that captures the light from the reflector. The image captured by the camera from the beginning to the end of the screw thread is processed by an image processing device to observe the image. The part where the pixels in the image change from dark pixels to bright pixels or from bright pixels to dark pixels, the part of the pixel that ...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned existing device has the problem that the defect at the beginning of the thread cannot be found because the part that changes from dark to bright or from bright to dark is judged as the beginning or defect of the thread.

Moreover, thread defects often occur at the beginning of the thread

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