Results 221 to 230 of about 197,230 (261)
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Spectral speckle-correlation imaging
Applied Optics, 2021We present a method for single-shot spectrally resolved imaging through scattering media by using the spectral memory effect of speckles. In our method, a single speckle pattern from a multi-colored object is captured through scattering media with a monochrome image sensor.
Kunihiko Ehira +4 more
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Applied Optics, 2000
A small spectral imaging system is presented that images static or moving objects simultaneously as a function of wavelength. The main physical principle is outlined and demonstrated. The instrument is capable of resolving both spectral and spatial information from targets throughout the entire visible region. The spectral domain has a bandpass of 12 A.
F, Sigernes +3 more
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A small spectral imaging system is presented that images static or moving objects simultaneously as a function of wavelength. The main physical principle is outlined and demonstrated. The instrument is capable of resolving both spectral and spatial information from targets throughout the entire visible region. The spectral domain has a bandpass of 12 A.
F, Sigernes +3 more
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Image spectral amplitude distributions
Journal of the Optical Society of America A, 2006Models for the probability density functions of the Fourier amplitude of images are derived. The densities are based on a simple model of an image made up of independent objects and incorporates the observed behavior of the circularly averaged power spectrum versus spatial frequency. The density function over all spatial frequencies gives a good fit to
W H, Hsiao, R P, Millane
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Spectral imaging fluorescence microscopy
Genes to Cells, 2002The spectral resolution of fluorescence microscope images in living cells is achieved by using a confocal laser scanning microscope equipped with grating optics. This capability of temporal and spectral resolution is especially useful for detecting spectral changes of a fluorescent dye; for example, those associated with fluorescence resonance energy ...
Tokuko, Haraguchi +4 more
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Dynamic spectral imaging with spectral zooming capability
Optics Letters, 2007We report a dynamic spectral imaging system with spectral band zooming and selection capability that can adapt to different application requirements and significantly reduce the size of the captured spectral image data cube. It employs a diffraction grating to disperse the spectral information of the captured image and uses a dynamic spatial filter at ...
Bing, Chen +3 more
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Spectral image estimation for coded aperture snapshot spectral imagers
SPIE Proceedings, 2008This paper describes numerical estimation techniques for coded aperture snapshot spectral imagers (CASSI). In a snapshot, a CASSI captures a two-dimensional (2D) array of measurements that is an encoded representation of both spectral information and 2D spatial information of a scene.
Ashwin A. Wagadarikar +3 more
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Science, 1984
An array of imaging spectrometers flown on the Spacelab 1 mission was capable of providing spectra of the atmospheric emissions over a broad wavelength range from 300 to 12,700 angstroms and acquiring each complete spectrum nearly simultaneously. The instrument was used to make observations on the day side and night side of the earth, looking down in ...
Marsha R. Torr, D. G. Torr
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An array of imaging spectrometers flown on the Spacelab 1 mission was capable of providing spectra of the atmospheric emissions over a broad wavelength range from 300 to 12,700 angstroms and acquiring each complete spectrum nearly simultaneously. The instrument was used to make observations on the day side and night side of the earth, looking down in ...
Marsha R. Torr, D. G. Torr
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Spectral Demons – Image Registration via Global Spectral Correspondence
2012Image registration is a building block for many applications in computer vision and medical imaging. However the current methods are lim- ited when large and highly non-local deformations are present. In this pa- per, we introduce a new direct feature matching technique for non-parametric image registration where efficient nearest-neighbor searches ...
Lombaert, Hervé +4 more
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Spectral multiplexing method for digital snapshot spectral imaging
Applied Optics, 2009We propose a spectral imaging method for piecewise "macropixel" objects, which allows a regular digital camera to be converted into a digital snapshot spectral imager by equipping the camera with only a disperser and a demultiplexing algorithm. The method exploits a "multiplexed spectrum" intensity pattern, i.e., the superposition of spectra from ...
Michael A, Golub +5 more
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Spectral imaging using single-axis spectrally dispersed illumination
Optics Letters, 2014Spectral imaging is a powerful tool for a wide variety of applications; however, low imaging rates and signal-to-noise ratios (SNRs) often limit its use for many biomedical applications. Here, we present a technique for spectral imaging using a unique two-dimensional illumination pattern having spectral dispersion in one axis.
Yair Bar-Ilan, Dvir Yelin
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