Journal ArticleDOI
Temporal and spatial properties of the time-varying speckles of botanical specimens
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TLDR
In this article, several applicable techniques, such as power spectral density and correlation, are used for measuring and analyzing the temporal speckle intensity variations, which exhibit information about the shelf life and aging of some botanical specimens used in the study.Abstract:
Techniques for measuring time-varying biospeckle of botanical specimens are investigated. Experimental evidence on the probability density function is presented. Several applicable techniques, such as power spectral density and correlation, are used for measuring and analyzing the temporal speckle intensity variations. These techniques are shown to exhibit information about the shelf life and aging of some botanical specimens used in our study. We also present a new phenomena related to the spatial properties of time-varying speckles. Theoretical and experimental results on the size of a speckle in a speckle pattern and its relation to the temporal intensity variation are also detailed.read more
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Journal ArticleDOI
Laser Doppler, speckle and related techniques for blood perfusion mapping and imaging
TL;DR: This review article presents the theory and practice of these techniques using a tutorial approach and compares the relative merits of the scanning and full-field approaches to velocity map imaging and concludes with a review of reported applications ofThese techniques to blood perfusion mapping and imaging.
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Capillary Blood Flow Monitoring Using Laser Speckle Contrast Analysis (LASCA)
TL;DR: A brief review of the theory linking the intensity fluctuations to the velocity and of the various techniques that have been proposed to measure them is presented and some recent developments in the search for a real-time, noninvasive, full-field technique for visualizing capillary blood flow are described.
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Speckle time evolution characterization by the co-occurrence matrix analysis
TL;DR: In this paper, the authors proposed the use of the co-occurrence matrix of the time history of the intensity of a speckle pattern and suggested a measure of the activity based on one of its second order moments.
Journal Article
Laser speckle contrast imaging for measuring blood flow
TL;DR: In this article, the authors reviewed the development of laser speckle imaging, starting with the connection established between speckles fluctuations and movement in the nineteen-seventies, and ten years later a digital version was used to monitor retinal blood flow.
Journal ArticleDOI
Display of local activity using dynamical speckle patterns
TL;DR: A display to distinguish loci of equal activity in samples showing dynamic speckle patterns and the generalized differences and the weighted generalized difference operations are presented and compared with previously reported methods.