Scanner-based Measurement of Print Line Placement
Abstract:Exact placement of print lines is extremely important to reduce density banding and color misregistration in a high-speed thermal tandem printer that employs separate print stations for each color. We propose a flatbed scanner method for precisely estimating the errors of line placement and print velocity. Our approach uses a model for the scanned data that translates line placement errors into phase variations. A classical phase estimation algorithm is then employed to robustly estimate the line placement error in the presence of print artifacts such as noise and thermal history effects. The optical distortion of the flatbed scanner is measured and the spatial frequency bands that contain large scanner errors are excluded from the analysis of the printer. We present examples that show the usefulness of this method in identifying problems in printer transport systems, and in verifying the effectiveness of solutions to these problems.
Document Type: Research Article
Publication date: January 1, 2002
For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.
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