A pair of images
are captured at a blur-free shutter speed, one using a multi-spectral ﬂash (F), the other using ambient illumination (A) which in this case
is 1/100th of that required for a correct exposure. The pair are combined to give an output image (R) which is of comparable quality to a
reference long exposure shot (L).
Column 1 shows the dark ﬂash
shot (F) and long exposure reference (L). Our results are shown in Columns 2,3 & 4. For each ambient image (A) of decreasing exposure
(yielding increased noise), we show the reconstructed output (R). Column 5 shows a visible ﬂash image (V), along with a visible ﬂash shot
(D) attenuated with neutral density ﬁlters so that it is comparably dazzling to F. The Low, Medium and High noise levels correspond to 6, 7
and 8 stops of underexposure respectively (corresponding to 1/64th, 1/128th and 1/256th of ambient long exposure).
In the last shot F, the dolls lips have been removed by the dark flash system
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