Performance of intensity-based non-normalized pointwise algorithms in dynamic speckle analysis.
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Intensity-based pointwise non-normalized algorithms for 2D evaluation of activity in optical metrology with dynamic speckle analysis are studied and compared and a new algorithm is proposed that provides the same quality of the 2D activity map for less computational effort.Abstract:
Intensity-based pointwise non-normalized algorithms for 2D evaluation of activity in optical metrology with dynamic speckle analysis are studied and compared. They are applied to a temporal sequence of correlated speckle patterns formed at laser illumination of the object surface. Performance of each algorithm is assessed through the histogram of estimates it produces. A new algorithm is proposed that provides the same quality of the 2D activity map for less computational effort. The algorithms are applied both to synthetic and experimental data.read more
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Dynamic speckle analysis with smoothed intensity-based activity maps
Elena Stoykova,Natalia Berberova,Youngmin Kim,Dimana Nazarova,Branimir Ivanov,Atanas Gotchev,Jisoo Hong,Hoonjong Kang +7 more
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References
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Evaluation of blood flow by laser speckle image sensing. Part 1.
TL;DR: A new method to visualize the microcirculation map using a dynamic laser speckle effect and the results were displayed in color graphics showing the spatial variation of the flow level in the area of interest.
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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.
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Assessment of Seed Viability by Laser Speckle Techniques
Roberto A. Braga,Inácio Maria Dal Fabbro,Flávio Meira Borém,Giovanni Francisco Rabelo,Ricardo Arizaga,Héctor Rabal,Marcelo Trivi +6 more
TL;DR: In this article, the biological activity of seed tissues has been inferred from quantitative and qualitative measurements of their speckle activity, and the authors show that the biospeckle technique has a potential as a methodology to assess seed viability.
Journal ArticleDOI
High-speed laser Doppler perfusion imaging using an integrating CMOS image sensor
Alexandre Serov,Theo Lasser +1 more
TL;DR: The design and the performance of a new high-speed laser Doppler imaging system for monitoring blood flow over an area of tissue using a digital integrating CMOS image sensor and the integrating property of the detector improves the signal-to-noise ratio of the measurements, which results in high-quality flow images.
Journal ArticleDOI
Temporal and spatial properties of the time-varying speckles of botanical specimens
TL;DR: 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.