Improved rendition of text and lines in inkjet and electrophotographic printers
Abstract
In this work, we investigate the perception of artifacts introduced by specific printing technologies on the quality of printed text and lines. In the first part, we investigate the effect of the dot characteristics on the quality of line-based images produced by an inkjet printer. We develop an image processing algorithm for analyzing printed dots and study the effect of the dot characteristics on perceived printalignment. We establish the perceptual preferences of human observers with respect to alignment via a set of psychophysical experiments. In the second part, we study artifacts introduced by the electrophotographic process that make certain edges appear blurred. We design image processing algorithms to pre-compensate for the effects of the artifacts on the printed image quality.\nWe base the design of the image processing tools on psychophysical theory regarding perception of blur and on empirical models of the electrophotographic process. We develop a memory efficient algorithm that is readily implementable in a typical printer's hardware.
Degree
Ph.D.
Advisors
Allebach, Purdue University.
Subject Area
Electrical engineering
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