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Proceedings Paper

Speckle contrast calculation based on pixels correlation: spatial analysis
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Paper Abstract

A trustworthy speckle contrast calculation is fundamental in many applications, such as “laser speckle contrast Imaging” (LSCI), which is a non-invasive technique commonly employed to estimate relative blood speed. In LSCI, the local contrast of a speckle image is calculated using spatial, temporal analysis or a combination of both. In this work, we focus on the spatial analysis. To calculate the local spatial contrast, typically, a sliding window of 5x5 pixels is used to calculate the standard deviation (σs) and the mean intensity (<I>s) of those 5x5 pixels and the calculated contrast KSs/(<I>s) is assigned to the central pixel of the sliding window. In this work, we show that this experimental procedure to calculate the local speckle contrast does not match the corresponding spatial theoretical model and we propose an alternative method that considers correlations of the central pixel with the other ones. We have found a better agreement of the contrast measurement with our numerical calculation.

Paper Details

Date Published: 18 August 2018
PDF: 5 pages
Proc. SPIE 10749, Interferometry XIX, 1074903 (18 August 2018); doi: 10.1117/12.2321271
Show Author Affiliations
B. Coyotl-Ocelotl, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
J. C. Juarez Ramirez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
R. Ramos-Garcia, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
R. Chiu, Univ. de Guadalajara (Mexico)
Teresita Spezzia-Mazzocco, Consejo Nacional de Ciencia y Tecnología (Mexico)
J. C. Ramirez-San-Juan, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)


Published in SPIE Proceedings Vol. 10749:
Interferometry XIX
Katherine Creath; Jan Burke; Michael B. North Morris; Angela D. Davies, Editor(s)

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