37. Softcopy monochrome banding assessment - 2011

37 Softcopy - Osman Arslan Prof Zygmunt Pizlo Prof Jan P Allebach*This research was supported by Hewlett Packard Company • Non-uniform spacing

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Unformatted text preview: Osman Arslan Prof. Zygmunt Pizlo Prof. Jan P. Allebach *This research was supported by Hewlett Packard Company. • Non-uniform spacing between scan lines • Banding is an important printer quality issue Constant image Paper process direction Digital value inch Image with intrinsic banding OPC drum velocity variation • Purpose: To investigate the visibility of banding for different printers by conducting psychophysical banding visibility assessment experiments. • We developed a softcopy environment to conduct various banding assessment experiments. The hardcopy print is reproduced on the monitor. This is done based on an appearance match. • Background for banding assessment. • Development of the softcopy environment. Background for appearance match methods. Appearance match experiments. • Banding simulation techniques. • Banding visibility assessment experiments. Banding matching experiment. Banding discrimination experiment. Banding detection experiment. Cross-platform experiment. • Conclusion and discussion. • Banding was categorized under the macro-uniformity image quality attribute by Dalal et al. (1998). • The highest weight was given to banding by Rasmussen et al. (2001) while defining the objectionability function of overall macro-uniformity. • Briggs et al. (2000) proposed a method to characterize banding of inkjet printers. • Cui et al. measured the visibility and objectionability threshold of inkjet banding. • Kane et al. presented metrics for quantification of banding • Several researchers developed methodologies to reduce banding (Lin et al (2000),Chen et al (2003), Ewe et al (2002)). • Because It saves time and the cost. It is easier to change the visibility of artifacts by modifying the parameters. It gives us the ability to simulate banding at lower amplitudes than the actual printer banding amplitude to investigate the banding detection threshold. • To duplicate the print on a softcopy display, we need to have an appearance match between hardcopy and softcopy by taking all these differences into consideration. Illumination Type Luminance Levels ¡ Surround White Black Hardcopy Reflective Brighter Brighter Average Softcopy Emissive Dimmer Darker Dark • Experimental methodologies » Viewing environments for cross-media image comparisons (Braun et al 1994). » Some hidden requirements for device-independent color imaging (Fairchild 1994). » CIE guidelines for coordinated research on evaluation of color appearance models for reflection print and self-luminous display image comparisons (1994). » Time course of chromatic adaptation for color appearance judgments (Fairchild et al 1994)....
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This note was uploaded on 02/19/2012 for the course ECE 638 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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37 Softcopy - Osman Arslan Prof Zygmunt Pizlo Prof Jan P Allebach*This research was supported by Hewlett Packard Company • Non-uniform spacing

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