Modeling and Synthesis of Aperture Effects in Cameras

Lanman, Douglas; Raskar, Ramesh; Taubin, Gabriel

Modeling and Synthesis of Aperture Effects in Cameras

Files

081-088.pdf (360.87 KB)

Date

2008

Authors

Lanman, Douglas
Raskar, Ramesh
Taubin, Gabriel

Publisher

The Eurographics Association

Abstract

In this paper we describe the capture, analysis, and synthesis of optical vignetting in conventional cameras. We analyze the spatially-varying point spread function (PSF) to accurately model the vignetting for any given focus or aperture setting. In contrast to existing "flat-field" calibration procedures, we propose a simple calibration pattern consisting of a two-dimensional array of point light sources - allowing simultaneous estimation of vignetting correction tables and spatially-varying blur kernels. We demonstrate the accuracy of our model by deblurring images with focus and aperture settings not sampled during calibration. We also introduce the Bokeh Brush: a novel, post-capture method for full-resolution control of the shape of out-of-focus points. This effect is achieved by collecting a small set of images with varying basis aperture shapes. We demonstrate the effectiveness of this approach for a variety of scenes and aperture sets.

        @inproceedings{:10.2312/COMPAESTH/COMPAESTH08/081-088
,
booktitle = {Computational Aesthetics in Graphics, Visualization, and Imaging
},
editor = {Douglas W. Cunningham and Victoria Interrante and Paul Brown and Jon McCormack
},
title = {{Modeling and Synthesis of Aperture Effects in Cameras
}},
author = {Lanman, Douglas and 
Raskar, Ramesh and 
Taubin, Gabriel
},
year = {2008
},
publisher = {The Eurographics Association
},
ISSN = {1816-0859
},
ISBN = {978-3-905674-08-8
},
DOI = {/10.2312/COMPAESTH/COMPAESTH08/081-088
}
}