Research On The On-line Quality Detection Base On The Test Target

The printing quality is the fundamental guarantee to survive in this market for a printing company. How to quickly control the printing quality in the modern convenient digital workflow becomes a problem that must be resolved. The traditional methods which detect the quality of the presswork with human eyes can not complete the detecting job well because of the influence of subjective factors. With the development of computer hardware and software, on-line detection methods have become practical.In order to improve the speed and efficiency of the printing quality detection, this subject researches the printing online detection system, and designs the printing detection software based on the CCD camera, and looks forward to promoting the application of the online detection system in the domestic printing enterprises.This paper takes a photograph of the standard color code with the CCD camera, and gets the RGB values of each patch using image software, at the same time, it gets the tristimulus values XYZ using the equipment, and establishes the conversion chart between them. Then it gets the conversion formula between the chromatic value and the density value by experiments. On this basis, it builds the printing quality control system with the PostScript test target which was self-designed, and validates the usefulness of online detection system by experiments.Base on the research of the theories, this paper uses Delphi 7 as a software platform, and designs the printing quality control system based on PS test target, and implements the purpose of controlling the presswork.Through the research of the subject, it analyses the technical path of building the online detection system, and monitors the quality of the printing, in order to reflect the superiority of online detection system, and promote the wide application.