Modeling and synthesis of aperture effects in cameras

  • Authors:

  • Douglas Lanman;Ramesh Raskar;Gabriel Taubin

  • Affiliations:

  • Mitsubishi Electric Research Laboratories, Cambridge, MA and Brown University, Division of Engineering, Providence, RI;Mitsubishi Electric Research Laboratories, Cambridge, MA and Massachusetts institute of Technology, Media Lab, Cambridge, MA;Brown University, Division of Engineering, Providence, RI

  • Venue:
  • Computational Aesthetics'08 Proceedings of the Fourth Eurographics conference on Computational Aesthetics in Graphics, Visualization and Imaging
  • Year:
  • 2008

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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.