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Statistics of Local Speckle Contrast

Description: 
In describing the first-order properties of laser speckle under polarized illumination conditions, it is almost an article of faith that the contrast is unity. In many processing schemes, however, the contrast defined as the quotient of the standard deviation and the mean is calculated over a localized spatial region. In such cases, this local contrast displays a distribution of values that can depart substantially from unity. Properties of this distribution depend on details of the data acquisition and on the size of the local neighborhood over which the contrast is calculated. We demonstrate that this local contrast can be characterized in terms of a log-normal distribution. Further, we show that the two defining parameters of this model can in turn be expressed in terms of the minimum speckle size and the extent of the local neighborhood. Performance of the model is illustrated with some typical optical coherence tomography data.
Record Format: 
application/pdf
Record Date: 
2008-01-01T08:00:00Z
Publisher: 
PDXScholar
Subject: 
Speckle
Optical coherence tomography
Speckle -- Statistics
Electrical and Computer Engineering
Type: 
text
Raw Url: 
https://pdxscholar.library.pdx.edu/do/oai/?metadataPrefix=&verb=GetRecord&identifier=oai:pdxscholar.library.pdx.edu:ece_fac-1119
Source: 
Electrical and Computer Engineering Faculty Publications and Presentations
Repository Record Id: 
oai:pdxscholar.library.pdx.edu:ece_fac-1119
SetSpec: 
publication:ece
publication:communities
publication:mcecs
publication:ece_fac
Record Title: 
Statistics of Local Speckle Contrast
Identifier: 
https://pdxscholar.library.pdx.edu/ece_fac/120
https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1119&context=ece_fac
Author: 
Duncan, Donald D.
Kirkpatrick, Sean J.
Wang, Ruikang K.
Database: 
Resource OE Format: