44. General measures - sharpness - 2011

44. General measures - sharpness - 2011 - An Investigation...

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Unformatted text preview: An Investigation of Perceived Sharpness and Sharpness Metrics* Zygmunt Pizlo Department of Psychological Sciences, Purdue University * This research is sponsored by the Hewlett-Packet Company Buyue Zhang, Jan P. Allebach School of Electrical and Computer Engineering, Purdue University Outline Introduction Sharpness Metrics Psychophysical Experiments Conclusions Introduction What is image sharpness? Resolution Acutance Why sharpness and sharpness metrics matter? Existing sharpness metrics Depend on the MTF of the system Require a reference image Our approach to sharpness metric Device-independent and no-reference Outline Introduction Sharpness Metrics Psychophysical Experiments Conclusions Sharpening and Blurring Methods Gaussian Filter and Unsharp Mask Filter Sharpening/Blurring methods Vary Vary Digital Sharpness Scale (DSS) DSS: the average of the maximal pixel difference in a window centered at each edge pixel Flower Girl House Motorcyclists Red Barn Rafting Sea Boat Fig. 1 Seven Selected Images....
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44. General measures - sharpness - 2011 - An Investigation...

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