NDLI: <formula formulatype=inline><tex Notation=TeX>${bf S}_{3}$</tex></formula>: A Spectral and Spatial Measure of Local Perceived Sharpness in Natural Images

Content Provider	IEEE Xplore Digital Library
Author	Vu, C.T. Phan, T.D. Chandler, D.M.
Copyright Year	1992
Abstract	This paper presents an algorithm designed to measure the local perceived sharpness in an image. Our method utilizes both spectral and spatial properties of the image: For each block, we measure the slope of the magnitude spectrum and the total spatial variation. These measures are then adjusted to account for visual perception, and then, the adjusted measures are combined via a weighted geometric mean. The resulting measure, i.e., S₃ (spectral and spatial sharpness), yields a perceived sharpness map in which greater values denote perceptually sharper regions. This map can be collapsed into a single index, which quantifies the overall perceived sharpness of the whole image. We demonstrate the utility of the S₃ measure for within-image and across-image sharpness prediction, no-reference image quality assessment of blurred images, and monotonic estimation of the standard deviation of the impulse response used in Gaussian blurring. We further evaluate the accuracy of S₃ in local sharpness estimation by comparing S₃ maps to sharpness maps generated by human subjects. We show that S₃ can generate sharpness maps, which are highly correlated with the human-subject maps.
Sponsorship	IEEE Signal Processing Society
Page Count	12
File Size	4534575
Starting Page	934
Ending Page	945
File Format	PDF
ISSN	10577149
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image edge detection Indexes Estimation Noise TV Humans Weight measurement total variation (TV) Blur human visual system (HVS) natural scenes sharpness spectral slope
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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S3: A spectral and spatial measure of local perceived sharpness in natural images

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