Paper Info
Title
Inspection Of Colour Printing Quality
Abstract
The use of machine vision technology is being investigated at VTT for improving the colour quality and productivity of web offset printing. The visual inspection of colour quality is performed by a colour CCD camera which traverses the moving web under a stroboscopic light. The measuring locations and goal values for the colour register, the ink density and the grey balance are automatically determined from the PostScript(TM) description of the digital page. A set of criteria is used to find the most suitable spots for the measurements. In addition to providing data for on-line control, the page analysis estimates the zone wise link consumption of the printing plates as a basis for presetting the ink feed. Target calorimetric CIE-values for grey balance and critical colours are determined from the image originals. The on-line measurement results and their derivations from the target values are displayed in an integrated manner. The paper gives test results of computation times, measurements of register error with and without test targets and the colour measuring capabilities of the system. The results show that machine vision can be used for on-line inspection of colour print quality. This makes it possible to upgrade older printing presses to produce a colour quality that is competitive with more modern presses.
Year
DOI
Venue
1996
10.1142/S0218001496000104
INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCE
Keywords
Field
DocType
colour, colour print quality, image processing, machine vision, quality inspection
Computer vision,Visual inspection,Machine vision,Inkwell,Colour look-up table,Impression,Offset printing,Image processing,Artificial intelligence,Mathematics,Computation
Journal
Volume
Issue
ISSN
10
2
0218-0014
Citations 
PageRank 
References 
2
0.40
0
Authors
3
Name
Order
Citations
PageRank
Caj Södergård1194.22
Raimo Launonen2452.56
Juuso Äikäs320.40