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Time and spatial-gated Fourier spectra and imaging were measured and analyzed. A picosecond Kerr-Fourier gate was used to image objects by selecting the spatial frequencies of objects illuminated by a laser pulse passing through a thick turbid medium. The earlier arriving ballistic/snake light and most of the later scattered light were spatially filtered and temporally separated to form an image. The image contrast and the signal-to-noise ratio of hidden objects in turbid media were greatly improved with the addition of Fourier spatial filtering.
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Wang et al. (1993) studied this question.
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