  Through pixel-wise optical coding of images during exposure time, it is
possible to extract sub-exposure images from a single capture. Such a
capability can be used for different purposes, including high-speed imaging,
high-dynamic-range imaging and compressed sensing. In this paper, we
demonstrate a sub-exposure image extraction method, where the exposure coding
pattern is inspired from frequency division multiplexing idea of communication
systems. The coding masks modulate sub-exposure images in such a way that they
are placed in non-overlapping regions in Fourier domain. The sub-exposure image
extraction process involves digital filtering of the captured signal with
proper band-pass filters. The prototype imaging system incorporates a Liquid
Crystal over Silicon (LCoS) based spatial light modulator synchronized with a
camera for pixel-wise exposure coding.
