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UCSD Computer Vision

@inproceedings { 552,
	title = {Photometric Stereo in a Scattering Medium},
	booktitle = {International Conference on Computer Vision (ICCV)},
	year = {2015},
	abstract = {Photometric stereo is widely used for 3D reconstruction.
However, its use in scattering media such as water, biological
tissue and fog has been limited until now, because of
forward scattered light from both the source and object, as
well as light scattered back from the medium (backscatter).
Here we make three contributions to address the key modes
of light propagation, under the common single scattering
assumption for dilute media. First, we show through extensive
simulations that single-scattered light from a source
can be approximated by a point light source with a single
direction. This alleviates the need to handle light source
blur explicitly. Next, we model the blur due to scattering of
light from the object. We measure the object point-spread
function and introduce a simple deconvolution method. Finally,
we show how imaging fluorescence emission where
available, eliminates the backscatter component and increases
the signal-to-noise ratio. Experimental results in a
water tank, with different concentrations of scattering media
added, show that deconvolution produces higher-quality
3D reconstructions than previous techniques, and that when
combined with fluorescence, can produce results similar to
that in clear water even for highly turbid media.},
	URL = {https://cseweb.ucsd.edu/~ravir/uwps.pdf},
	author = {Zak Murez and Tali Treibitz and Ravi Ramamoorthi and David Kriegman}
}