Results 321 to 330 of about 3,110,122 (363)
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Contrast in speckled imagery with stochastic distances
2010 IEEE International Conference on Image Processing, 201072
Alejandro C. Frery +2 more
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Hadamard speckle contrast reduction
Optics Letters, 2004The condition for a diffuser to produce the maximum speckle contrast reduction with the minimum number of distinct phase patterns is derived. A binary realization of this optimum diffuser is obtained by mapping the rows or columns of a Hadamard matrix to the phase patterns.
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61.3: Simulation and Measurement of Laser Speckle and Speckle Contrast
SID Symposium Digest of Technical Papers, 2012AbstractThe simulation and experimental results of laser speckle and speckle contrast are presented. The correct speckle contrast was obtained when the ratio of the speckle size to the CCD pixel size is larger than 3.5, and the ratio of the maximum speckle intensity to the CCD saturation is in 0.3∼1.0.
Wei-Feng Hsu +2 more
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Geometry influence on polychromatic speckle contrast
SPIE Proceedings, 2006Speckle contrast is widely used in various applications. In this work we develop a simple model to examine the influence of optical geometry on contrast reduction for polychromatic speckle the Fresnel diffraction zone. The model is based on the known fact that the sum of N independent speckle patterns decreases the contrast of the resultant pattern ...
Tim K. Lee +5 more
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Speckle-contrast monitoring of tissue thermal modification
Applied Optics, 2002Measurements of the contrast value of time-averaged speckle-modulated images of cartilage tissue are used to study tissue thermal modification in the case of laser-light treatment. This modification is related to thermally induced internal stress relaxation in the matrix of the treated tissue.
Alexander P. Sviridov +5 more
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A Miniaturized Platform for Laser Speckle Contrast Imaging
IEEE Transactions on Biomedical Circuits and Systems, 2012Imaging the brain in animal models enables scientists to unravel new biological insights. Despite critical advancements in recent years, most laboratory imaging techniques comprise of bulky bench top apparatus that require the imaged animals to be anesthetized and immobilized.
Kartikeya Murari +3 more
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Surgical Innovation, 2019
Background. The main limitation of perfusion assessment with indocyanine green fluorescence angiography during colorectal surgery is that the surgeon assesses the quality of perfusion subjectively.
Shigehiro Kojima +5 more
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Background. The main limitation of perfusion assessment with indocyanine green fluorescence angiography during colorectal surgery is that the surgeon assesses the quality of perfusion subjectively.
Shigehiro Kojima +5 more
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Calibration in laser speckle contrast imaging
Biomedical Optics, 2006We provided a novel calibration procedure in laser speckle contrast imaging that can efficiently compensate systematic errors in speckle contrast caused by speckle/pixel size mismatch and static scatters in the tissue.
David A. Boas +2 more
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Journal of Biophotonics, 2019
Moderate heating of collagenous tissues such as cartilage and cornea by infrared laser irradiation can produce biologically nondestructive structural rearrangements and relaxation of internal stresses resulting in the tissue reshaping.
O. Baum +8 more
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Moderate heating of collagenous tissues such as cartilage and cornea by infrared laser irradiation can produce biologically nondestructive structural rearrangements and relaxation of internal stresses resulting in the tissue reshaping.
O. Baum +8 more
semanticscholar +1 more source
Multiple orientated speckle patterns: a study of the contrast
Applied Optics, 1986On analyse les proprietes statistiques du premier ordre de la figure de speckle formee comme la somme de N figures de speckle partiellement correlees. L'enregistrement de multiples figures de speckles orientees dans une seule plaque photographique a ete utilise dans beaucoup d'applications reliees a l'affichage de l ...
Héctor Rabal +3 more
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