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Laser speckle imaging using a consumer-grade color camera |
Optics Letters, Vol. 37, Issue 19, pp. 3957-3959 (2012)
http://dx.doi.org/10.1364/OL.37.003957
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Abstract
Laser speckle imaging (LSI) is a noninvasive optical imaging technique able to provide wide-field two-dimensional maps of moving particles. Raw laser speckle images are typically taken with a scientific-grade monochrome camera. We demonstrate that a digital single-lens reflex (dSLR) camera with a Bayer filter is able to provide similar sensitivity despite taking information only from a specific pixel color. Here we demonstrate the effect of changing three primary dSLR exposure settings (i.e., aperture, exposure time/shutter speed, and gain/sensitivity (ISO)) on speckle contrast. In addition, we present data from an in vivo reactive hyperemia experiment that demonstrates the qualitative similarity in blood-flow dynamics visualized with a color dSLR and a scientific-grade monochrome camera.
© 2012 Optical Society of America
OCIS Codes
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
ToC Category:
Spectral Imaging Sensors
History
Original Manuscript: June 28, 2012
Revised Manuscript: August 14, 2012
Manuscript Accepted: August 22, 2012
Published: September 18, 2012
Citation
Owen Yang and Bernard Choi, "Laser speckle imaging using a consumer-grade color camera," Opt. Lett. 37, 3957-3959 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-19-3957
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