Bottle cap gap width estimation method by using transmission type illuminating and imaging system

Abstract

The invention discloses a bottle cap gap width estimation method by using a transmission type illuminating and imaging system. The bottle cap gap width estimation method comprises the following steps: (1) constructing the transmission type illuminating and imaging system to obtain an illumination detected image of a bottle cap gap region; (2) automatically determining a bottom cap region by using a regional marking algorithm; (3) using a canny edge detection algorithm to obtain a profile diagram of the bottle cap region, and using a growth type straight line detection algorithm to obtain a straight line profile of the upper edge of a gap; (4) using a black and white binarization algorithm to determine the straight line profile of the lower edge of the gap to obtain a pixel region of the whole bottle cap gap; and (5) using a pixel-actual distance conversion relation to obtain an estimated width value of the bottle cap gap. According to the bottle cap gap width estimation method disclosed by the invention, the transmission type illuminating and imaging system is used, thereby being capable of effectively avoiding the interference of the reflecting property of a material to the detected image; and by combining with an optimized visual detection algorithm, the width profile of the bottle cap gap can be accurately detected, so that the maximum value of the width of the bottle cap gap can be estimated.

Description

technical field [0001] The invention relates to image processing technology in industrial machine vision detection, in particular to a method for estimating the gap width of a bottle cap using a transmission illumination imaging system. Background technique [0002] With the development of automation technology of industrial assembly line, a large number of bottle cap packaging products need to be tested for product quality. Among them, the gap width of the bottle cap is an important standard for whether the product packaging is qualified. For this, many methods have been proposed to realize the detection of the gap width of the bottle cap to control the yield of industrial products. [0003] Existing methods for detecting the gap width of bottle caps mainly include manual detection and machine vision detection. Manual detection requires production line workers to observe the gap of bottle caps online at all times, which not only requires a lot of labor costs, but also cann...

AI Technical Summary

Problems solved by technology

However, the reflective lighting imaging system is easily affected by the reflective characteristics of the bottle body and the cork material, which affects the accuracy of the automatic gap width algorithm and has a high false detection rate.

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