2013
DOI: 10.1364/oe.21.028902
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Correcting speckle contrast at small speckle size to enhance signal to noise ratio for laser speckle contrast imaging

Abstract: In laser speckle contrast imaging, it was usually suggested that speckle size should exceed two camera pixels to eliminate the spatial averaging effect. In this work, we show the benefit of enhancing signal to noise ratio by correcting the speckle contrast at small speckle size. Through simulations and experiments, we demonstrated that local speckle contrast, even at speckle size much smaller than one pixel size, can be corrected through dividing the original speckle contrast by the static speckle contrast. Mo… Show more

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Cited by 25 publications
(13 citation statements)
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“…[23][24][25][26] The rational for that assumption is that the contrast decreases when several speckles are formed per pixel, and that a proper sampling should exceed the Nyquist criterion, i.e., at least 2 pixels per speckle. However, in line with the findings by Qiu et al, 27 we report a reduced stochastic noise and increased signal-to-noise ratio (SNR) when the optical setup results in many speckles per pixel, despite the fact that the overall contrast decreases. The results shown in Fig.…”
Section: Discussionsupporting
confidence: 92%
“…[23][24][25][26] The rational for that assumption is that the contrast decreases when several speckles are formed per pixel, and that a proper sampling should exceed the Nyquist criterion, i.e., at least 2 pixels per speckle. However, in line with the findings by Qiu et al, 27 we report a reduced stochastic noise and increased signal-to-noise ratio (SNR) when the optical setup results in many speckles per pixel, despite the fact that the overall contrast decreases. The results shown in Fig.…”
Section: Discussionsupporting
confidence: 92%
“…This is a trade-off, since decreasing the aperture also decreases the signal-to-noise ratio. 6,21 Due to the short-exposure time, we have determined that having the maximum amount of light is beneficial, but this is an area of possible improvement. We mitigate some of the effect of surface contrasts by measuring out of focus.…”
Section: Discussionmentioning
confidence: 99%
“…In addition, the improvement of aLSCI in SNR is lower than that of KC-ADF. Another SNR improvement method, the random estimator method proposed by P. Miao [7], also provides good vessel boarder sharpness, but the improvement in SNR is several times lower than that of KC-ADF.…”
Section: Discussionmentioning
confidence: 99%