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Efficient, Blind, Spatially-Variant Deblurring for Shaken Images

Oliver Whyte 1, 2 Josef Sivic 1, 2 Andrew Zisserman 3 Jean Ponce 1, 2
1 WILLOW - Models of visual object recognition and scene understanding
DI-ENS - Département d'informatique de l'École normale supérieure, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR8548
Abstract : In this chapter we discuss modeling and removing spatially-variant blur from photographs. We describe a compact global parameterization of camera shake blur, based on the 3D rotation of the camera during the exposure. Our model uses three-parameter homographies to connect camera motion to image motion and, by assigning weights to a set of these homographies, can be seen as a generalization of the standard, spatially-invariant convolutional model of image blur. As such we show how existing algorithms, designed for spatially-invariant deblurring, can be "upgraded" in a straightforward manner to handle spatially-variant blur instead. We demonstrate this with algorithms working on real images, showing results for blind estimation of blur parameters from single images, followed by non-blind image restoration using these parameters. Finally, we introduce an efficient approximation to the global model, which significantly reduces the computational cost of modeling the spatially-variant blur. By approximating the blur as locally-uniform, we can take advantage of fast Fourier-domain convolution and deconvolution, reducing the time required for blind deblurring by an order of magnitude.
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Submitted on : Saturday, September 13, 2014 - 2:45:24 PM
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Oliver Whyte, Josef Sivic, Andrew Zisserman, Jean Ponce. Efficient, Blind, Spatially-Variant Deblurring for Shaken Images. A. N. Rajagopalan; Rama Chellappa. Motion Deblurring: Algorithms and Systems, Cambridge University Press, 2014. ⟨hal-01063814⟩

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