Results 91 to 100 of about 143,665 (236)

Confidence Level and Sensitivity Limits in High Contrast Imaging

, 2007
In long adaptive optics corrected exposures, exoplanet detections are currently limited by speckle noise originating from the telescope and instrument optics, and it is expected that such noise will also limit future high-contrast imaging instruments for
Bruce Macintosh, Christian Marois, David Lafreniere, Dohlen K., Macintosh B., Macintosh B., Potter D., Rene Doyon, Roddier F.   +8 more
core   +1 more source

Robust quantitative single-exposure laser speckle imaging with true flow speckle contrast in the temporal and spatial domains [PDF]

arXiv, 2019
A systematic and robust laser speckle contrast imaging (LSCI) method and procedure is presented, covering the LSCI system calibration, static scattering removal, and measurement noise estimation and correction to obtain a true flow speckle contrast and the flow speed from single-exposure LSCI measurements.
arxiv  

Speckle filtering method in the gonad ultrasound image for Mahseers Fish (Tor Tombroides) [PDF]

, 2018
In fish breeding production, it is crucial to know the maturation of the eggs before spawning. In order to do that, possible use of ultrasound in identifying the eggs in the gonad is investigated.
Abd Razak, Nurul Asmaa, Khalid, Fatimah, Madzin, Hizmawati, Mustaffa, Mas Rina   +3 more
core  

Performance of the SOAR Speckle Instrument

The Astronomical Journal
The High Resolution Camera (HRCam) speckle imager at the 4.1 m Southern Astrophysical Research telescope is a highly productive instrument that has accumulated about 40K observations to date.
Andrei Tokovinin
doaj   +1 more source

Physical pupil manipulation for speckle reduction in digital holographic microscopy

Heliyon, 2021
The reduction of speckle noise by physically changing the pupil of the imaging system, as first envisioned in optical holography, is experimentally applied to a digital holographic microscope (DHM).
Carlos Buitrago-Duque, Jorge Garcia-Sucerquia   +1 more
doaj  

Penapisan Derau Gaussian, Speckle dan Salt&Pepper Pada Citra Warna

IJCCS (Indonesian Journal of Computing and Cybernetics Systems), 2011
Quality of digital image can decrease becouse some noises. Noise can come from lower quality of image recorder, disturb when transmission data process and weather. Noise filtering can make image better becouse will filtering that noise from the image and
Ika Purwanti Ningrum, Agfianto Eko Putra, Dian Nursantika   +2 more
doaj   +1 more source

Make It Less Complex: Autoencoder for Speckle Noise Removal-Application to Breast and Lung Ultrasound. [PDF]

J Imaging, 2023
Oliveira-Saraiva D, Mendes J, Leote J, Gonzalez FA, Garcia N, Ferreira HA, Matela N.   +6 more
europepmc   +1 more source

The entropy of keys derived from laser speckle

, 2007
Laser speckle has been proposed in a number of papers as a high-entropy source of unpredictable bits for use in security applications. Bit strings derived from speckle can be used for a variety of security purposes such as identification, authentication,
Skoric, B.
core   +1 more source

Speckle-modulating optical coherence tomography in living mice and humans

Nature Communications, 2017
Optical coherence tomography, a technique that can image inside tissue, is susceptible to speckle noise that limits its diagnostic potential. Here, Libaet al.
Orly Liba, Matthew D. Lew, Elliott D. SoRelle, Rebecca Dutta, Debasish Sen, Darius M. Moshfeghi, Steven Chu, Adam de la Zerda   +7 more
doaj   +1 more source

Reduction of speckle noise in laser energy distribution on the target by means of modified Fourier hologram and incoherent averaging technique

Semiconductor Physics, Quantum Electronics & Optoelectronics, 2018
Presented in this paper is the technique of formation of required laser intensity distribution on the target with a reduced speckle noise. The method is based on the use of modified Fourier hologram adapted to controlled phase modulators.
A.G. Derzhypolskyi, O.V. Gnatovskyi, L.A. Derzhypolska   +2 more
doaj   +1 more source