A Study For Ink Presetting And Detecting Based On Machine Vision

In the process of printing,the changing of ink quantity has a direct impact on the quality of the printed products.Ink amount presetting and detecting is one of the key factors to improve the quality of printed products.So the ink amount presetting and detecting research is of great significance.However,the traditional method which depends on the naked eye,manual adjustment is not accurate and the effect is poor.And the method which measures the control strip in the sheet is very slow and can't realize on-line detection.At the same time,the methods based on digital image processing are widely used in printing.In this context,the method that ink presetting and detecting based on machine vision is raised.This paper mainly includes establishing color space conversion model and calculating the ink amount of ink zone.Firstly,in order to obtain color modeling data,designing and printing color target file is needed.Besides,in order to analysis the precision of the model,designing and printing color test file is needed.The designed file should be printed and scaned,use projection method to get the color lump boundary.Then get RGB value of each pix in the color lump,calculate average RGB of each color lump,use densimeter to get CIEL*a*b*,and get CMYK value in Photoshop.Then establish scan RGB color space to CIEL*a*b*color space conversion model,and establish CIEL*a*b*color space to CMYK color space conversion model.And use the data of test file to analysis the color difference.Before calculating the ink amount of ink zone,designing and printing sample sheet and print sheet is needed,control strip should be designed and added into the bottom of sample sheet and print sheet,the segment ink zone and get ink thickness and paper size.For the accuracy,ink presetting is based on the whole print page.Ink detecting can based on the whole print page,can also based on the control strip,use projection method to segment control strip.At last,according to the difference of the ink amount data can get the ink control information.The paper designed and developed ink presetting and detecting system which based on speed and accuracy.Using this system can preset and detect the ink amount,which provides a reliable reference for future research and method.