Algorithm for color difference detection based on machine vision is studied to solve the problem of color difference detection in metal printing. By printing color mark in metal blank area

capture color mark areas on metal printing products using industrial CCD cameras

digital image processing technique is applied to extract color. Use color difference detection algorithm based on HSV color space and color difference detection algorithm based on CIELAB color space

analyze color difference detection results in two kinds of color space

using the method combining the two kinds of color space detection algorithms

implement rapid and effective detection

and at the same time

it can ensure accuracy of detection results.