NDLI: Glare aware photography: 4D ray sampling for reducing glare effects of camera lenses

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Glare aware photography: 4D ray sampling for reducing glare effects of camera lenses

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Glare aware photography: 4D ray sampling for reducing glare effects of camera lenses

Content Provider	ACM Digital Library
Author	Agrawal, Amit Wilson, Cyrus A. Veeraraghavan, Ashok Raskar, Ramesh
Abstract	Glare arises due to multiple scattering of light inside the camera's body and lens optics and reduces image contrast. While previous approaches have analyzed glare in 2D image space, we show that glare is inherently a 4D ray-space phenomenon. By statistically analyzing the ray-space inside a camera, we can classify and remove glare artifacts. In ray-space, glare behaves as high frequency noise and can be reduced by outlier rejection. While such analysis can be performed by capturing the light field inside the camera, it results in the loss of spatial resolution. Unlike light field cameras, we do not need to reversibly encode the spatial structure of the ray-space, leading to simpler designs. We explore masks for uniform and non-uniform ray sampling and show a practical solution to analyze the 4D statistics without significantly compromising image resolution. Although diffuse scattering of the lens introduces 4D low-frequency glare, we can produce useful solutions in a variety of common scenarios. Our approach handles photography looking into the sun and photos taken without a hood, removes the effect of lens smudges and reduces loss of contrast due to camera body reflections. We show various applications in contrast enhancement and glare manipulation.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF QT / MOV
ISBN	9781450301121
DOI	10.1145/1399504.1360655
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-08-11
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Flare Glare Light fields Computational photography Masks
Content Type	Video Text
Resource Type	Article

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