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Quasi noise-free digital holography

Noise originating from the coherent nature of laser light is the scourge of digital holography, always causing holographic images to be of lower quality than conventional photographs. Now scientists have practically eliminated this noise by using a two-stage algorithm. The output obtained exhibited both qualitative and quantitative improvement over recently developed de-noising techniques. In particular, the algorithm reduced noise in background regions by 98 percent and in signal regions by 92 percent.

(via WSJ)