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19 July 1999 Imaging through scattering media using cameras and parallel processing
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Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354984
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States
Abstract
Matrices of detectors carrying up to a few millions of pixels have changed in many aspects the science of imaging from astronomy to popular photography as well as from X rays to infrared. Most of the time they have been used for signal acquisition but rarely as an active part of the signal processing. A few years ago we have proposed ' touse such sensors, which convert radiations into charges and store them before reading, in order to achieve parallel lock-in or heterodyne detection at frequencies much higher than the speed of image acquisition. In the usual single channel lock-in detection scheme the (amplified) periodical noisy signal as multiplied by a noiseless synchronous reference signal and then filtered by a low-pass filter. In our approche 2 roughly speaking, the low-pass filter is replaced by the charge integration during one image acquisition whereas the multiplication is replaced by a synchronous excitation of the source (typically each half or quarter of period). Let us point out that the gain in term of signal-to-noise ratio is about the same in the two approaches (as long as we have to face a white noise such as the shot noise) but in the last one acquisition time can be i04 to iO times faster. In the two examples that we will describes below we will take advantage of the new promising field of biomedical imaging to demonstrate how helpful is our approach for imaging inside biological tissues which are strong light scatterers.
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Sandrine Leveque, Arnaud Dubois, Emmanuel Beaurepaire, Loic Pottier, Albert Claude Boccara, Martial Lebec, and Herve Saint-Jalmes "Imaging through scattering media using cameras and parallel processing", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.354984; https://doi.org/10.1117/12.354984
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