Results 91 to 100 of about 1,068,113 (278)
Advanced Healthcare Materials, EarlyView.This study presents an implantable, wireless, battery‐free oximeter that can continuously monitor physiologically consistent regional tissue oxygenation under dynamic changes of blood volume. This is achieved through multiwavelength photoplethysmography and validated both via Monte Carlo simulations and in vivo rat studies. Different stress events were
Anat Usatinsky +12 more
wiley +1 more source
A method of speckle noise reduction for SAR data
International Journal of Remote Sensing, 1995 Synthetic Aperture Radar (SAR) is a high resolution active microwave sensor, but its processed data have nuisance noise called speckle noise which degrades image quality. This noise is conspicuous when the data are processed in small number of looks. In this paper, a new method for speckle reduction, the CST filter, is proposed.
Wakabayashi, Hiroyuki, Arai, Kohei
openaire +2 more sources
Advanced Healthcare Materials, EarlyView.In this study, we fabricate photovoltaic retinal implants with pyrolytic carbon electrodes and test their ability to stimulate mouse and pig retinas when illuminated with near‐infrared light. We find increased spiking activity in both animal models compared to spontaneous activity and TTX controls and analyze the spike amplitude, latency and frequency.
Akihiro Matsumoto +10 more
wiley +1 more source
Suppression of Speckle Noise by Speckle Pinning in Adaptive Optics
The Astrophysical Journal, 2002 Optical astronomy is increasingly concerned with the detection of faint companions, which may eventually include planetary systems, close to much brighter primary stars. Detection limits are generally set by "speckle noise," random variations in focal plane intensity that result when atmospheric turbulence redistributes the undesirably copious flux of ...
openaire +1 more source
Noise in laser speckle correlation and imaging techniques
Optics Express, 2010 We study the noise of the intensity variance and of the intensity correlation and structure functions measured in light scattering from a random medium in the case when these quantities are obtained by averaging over a finite number N of pixels of a digital camera.
S. E. Skipetrov +5 more
openaire +7 more sources
Advanced Healthcare Materials, EarlyView.Hydrophilic fluorinated copolymers dissolve in chyme and give a strong, single 19F signal, unlike phase‐separating perfluorocarbons. Combined 1H‐19F MRI tracks their whole‐gut transit non‐invasively and without ionizing radiation. In rats, the tracers move through the gastrointestinal tract, resist resorption, and are well tolerated, a proof‐of‐concept
Ondřej Groborz +13 more
wiley +1 more source
Speckle Noise Reduction and Image Segmentation Based on a Modified Mean Filter
Computer Assisted Methods in Engineering and Science, 2020 Image segmentation is an essential process in many fields involving digital images. In general, segmentation is the process of dividing the image into objects and background image. Image segmentation is an important step in the object detection process.
P. Arulpandy, M. Trinita Pricilla
doaj +1 more source
Optical Detection of Cellular Signals at Material Interfaces
Advanced Healthcare Materials, EarlyView.Emerging functional materials are transforming optical detection of cellular signals. This review highlights optical techniques that exploit the unique optical properties of diverse materials to detect and quantify cellular electrical, chemical, and mechanical signals, and discusses key opportunities and challenges.
Xuchen Ren +5 more
wiley +1 more source
Computational de-noising based on deep learning for phase data in digital holographic interferometry
APL Photonics, 2020 This paper presents a deep-learning-based algorithm dedicated to the processing of speckle noise in phase measurements in digital holographic interferometry.
Silvio Montresor +3 more
doaj +1 more source
An experimental study of particle sedimentation using ultrasonic speckle velocimetry [PDF]
, 2010 Ultrasonic speckle velocimetry (USV) is a non-invasive technique that allows the measurement of fluid velocity in flow and also that of powders under sedimentation.
Delaunay, Thomas +2 more
core +1 more source