brown_automatic.pdf (2.69 MB)
Automatic gravure print feature determination at production speeds
journal contributionposted on 2009-05-22, 14:04 authored by Neil Brown, Michael Jackson, Robert M. Parkin
This paper describes the development of a non-contact system for measuring the colour of printed material at web speeds, in addition to gravure-printed dot feature recognition. The system proposed uses a non-contact spectrophotometer based on a holographic grating, in conjunction with a conventional monochrome area scan camera, from which colour spectral data are extracted, while a xenon flash is used to illuminate colour samples. Dot features are captured by a magnification lens, in conjunction with a progressive scan camera. Software and hardware details of the system are given, together with the underlying mathematics for colour space conversion and measurement. Conversion equations from X, Y, Z chromaticity coordinates to the RGB system are presented, and also equations to convert from the L*a*b* colour space to X, Y, Z chromaticity coordinates. Experimental results are presented whereby the non-contact spectral system is shown to perform to a colour tolerance exceeding that of conventional colour video systems, and where performance of the dot feature system is comparable with traditional static examination methods using a microscope.
- Mechanical, Electrical and Manufacturing Engineering
CitationBROWN, N., JACKSON, M.R. and PARKIN, R.M., 2003. Automatic gravure print feature determination at production speeds. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 217(8), pp. 1101-1110.
PublisherProfessional Engineering Publishing / © IMECHE
- VoR (Version of Record)
NotesThis is an article from the journal, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture [© IMechE ]. It is also available at: http://www.pepublishing.com/