Besides the obvious elimination of what can be annoying by making the
flash almost imperceptable, it appears to allow for elimination of
reflections/hot spots if desired.
http://www.umiacs.umd.edu/~aagrawal/sig05/Gradient_Projection.html
3D information can be obtained as well. The color balance is weird
with the UV/IR image. The fuzzy ambient image is
used to correct the color balance. If there are elements in the image
tha absorb UV and IR, it can be a problem. Freckles seem to vanish..
Ahh, that's it, a freckle terminator application.
Dr. Stealth Flash
I'm not sure what the application would be. What they have not shown in
their samples is anything with a background. The flash doesn't reach
back there so you would have a UV/IR reconstructed foreground but with
only ambient in the background. The need to find an application first.
Chuck Norcutt
usher99 [at] aol.com wrote:
Interesting developments at NYU. "Dark Flash" photography uses IR and
UV via a modified Nik SB 14 UV flash with filters. Two shots taken in
quick sucession; 1 ambient and one with the flash and then processed
with proprietary software. Details are hard to come by as they seem to
be negotiating with manufacturers to mainstream this.
Mike (AKA Dr. Stealth Flash)
http://cs.nyu.edu/~dilip/wordpress/?page_id=38
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