Results 281 to 290 of about 44,997 (341)
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IEEE Journal of Quantum Electronics, 1981
A technique is presented to determine surface contours of 3-D objects by laser speckle interferometry. A double exposure specklegram is recorded by giving the object a small tilt between exposures. Surface contours are obtained by Fourier filtering of the specklegram.
G K, Jaisingh, F P, Chiang
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A technique is presented to determine surface contours of 3-D objects by laser speckle interferometry. A double exposure specklegram is recorded by giving the object a small tilt between exposures. Surface contours are obtained by Fourier filtering of the specklegram.
G K, Jaisingh, F P, Chiang
openaire +2 more sources
Lasers in Surgery and Medicine, 2020
Keloids are described as benign dermal fibroproliferative lesions, and vascularization may play a significant role in their pathogenesis. In this study, laser speckle contrast imaging (LSCI) was used to assess perfusion within keloids and surrounding ...
Cheng Chen +6 more
semanticscholar +1 more source
Keloids are described as benign dermal fibroproliferative lesions, and vascularization may play a significant role in their pathogenesis. In this study, laser speckle contrast imaging (LSCI) was used to assess perfusion within keloids and surrounding ...
Cheng Chen +6 more
semanticscholar +1 more source
Dynamic laser speckle analysis using the event sensor.
Applied Optics, 2020Dynamic laser speckle analysis (DLSA) can obtain useful information about the scene dynamics. Traditional implementations use intensity-based imaging sensors such as a complementary metal oxide semiconductor and charge-coupled device to capture time ...
Zhou Ge, Nan Meng, Li Song, E. Lam
semanticscholar +1 more source
Physical Review E, 1994
We demonstrate experimentally that the intensity correlation function with shift in the scattered wave vector or with identical shifts in both the incident and scattered wave vectors form Fourier transform pairs, respectively, with the intensity distribution on the output surface and the propagator between the input and output surfaces. Measurements in
, Li, , Genack
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We demonstrate experimentally that the intensity correlation function with shift in the scattered wave vector or with identical shifts in both the incident and scattered wave vectors form Fourier transform pairs, respectively, with the intensity distribution on the output surface and the propagator between the input and output surfaces. Measurements in
, Li, , Genack
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Applied Optics, 1989
A new rotary encoder is proposed which detects displacement of speckle arising in the diffraction field of a cylinder illuminated by a narrow laser beam. The displacement is detected from the peak position of the cross-correlation between the outputs of a linear image sensor.
I, Yamaguchi, T, Fujita
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A new rotary encoder is proposed which detects displacement of speckle arising in the diffraction field of a cylinder illuminated by a narrow laser beam. The displacement is detected from the peak position of the cross-correlation between the outputs of a linear image sensor.
I, Yamaguchi, T, Fujita
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Tracking and navigation of a microswarm under laser speckle contrast imaging for targeted delivery
Science RoboticsMicro/nanorobotic swarms consisting of numerous tiny building blocks show great potential in biomedical applications because of their collective active delivery ability, enhanced imaging contrast, and environment-adaptive capability.
Qinglong Wang +14 more
semanticscholar +1 more source
Laser speckle projection tomography
Optics Letters, 2013We propose a laser speckle projection tomography (LSPT) method to obtain a three-dimensional (3D) flowing image. The method combines the advantages of optical projection tomography and laser speckle imaging to reconstruct the visualization of 3D flowing structure.
Guanping, Feng +4 more
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Laser Physics Letters, 2020
We report a compact, low cost, multi-color diode laser based illumination system for display and laser-projectors. An innovative speckle reduction system based on spatially structured and temporally varying beams was designed and developed. Three primary
Virendra Kumar +5 more
semanticscholar +1 more source
We report a compact, low cost, multi-color diode laser based illumination system for display and laser-projectors. An innovative speckle reduction system based on spatially structured and temporally varying beams was designed and developed. Three primary
Virendra Kumar +5 more
semanticscholar +1 more source
High‐Power Multimode Random Fiber Laser for Speckle‐Free Imaging
Annals of Physics, 2021New light sources with low spatial coherence and high brightness are crucial for high‐quality imaging. In this paper, such a light source is reported, which is formed by combining random lasing used as seed light with a multimode fiber (MMF) mediated ...
S. Wang +7 more
semanticscholar +1 more source
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
semanticscholar +1 more source
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
semanticscholar +1 more source