38. Softcopy color banding assessment - 20011

38. Softcopy color banding assessment - 20011 - Development...

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Unformatted text preview: Development of Softcopy Environment for Primary Color Banding Visibility Assessment Byungseok Min*, Zygmunt Pizlo**, and Jan Allebach* School of Electrical and Computer Engineering **Department of Psychological Sciences Purdue University, West Lafayette, IN Research supported by Hewlett-Packard Company Outline Motivation Development of hardcopy environment for banding discrimination Development of softcopy environment Verification of the softcopy environment Conclusion Past Studies on Banding Assessment Cui et al.(2001): measurement of monochrome banding threshold in inkjet printers Bang et al.(2003): monochrome banding discrimination in hardcopy environment Arslan et al.(2005): monochrome banding discrimination in softcopy environment Chen et al.(2004): softcopy environment for sinusoidal artificial banding of secondary color Motivation Constant image Paper process direction Hardcopy Image with intrinsic banding OPC drum velocity variation Softcopy Image with intrinsic banding A color is represented by 3-D signal, but the banding perception is described in 1-D space beginning with primary colorant The same banding perception in both hardcopy and softcopy environment Generation of Extrinsic Banding in Hardcopy Environment Banding Level 1-D Banding profile Projection & Filtering Intrinsic banding image Scanner Curve Line pattern image Printer Scanner dE pixel Random phase Printer Extrinsic Banding Image (1~200 cpi) Extrinsic banding level 1-D representation Extracting banding profile PWM coding...
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38. Softcopy color banding assessment - 20011 - Development...

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