Results 11 to 20 of about 143,665 (236)
Speckle Decorrelation and Dynamic Range in Speckle Noise Limited Imaging [PDF]
arXiv, 2003 The useful dynamic range of an image in the diffraction limited regime is usually limited by speckles caused by residual phase errors in the optical system forming the image. The technique of speckle decorrelation involves introducing many independent realizations of additional phase error into a wavefront during one speckle lifetime, changing the ...
Anand Sivaramakrishnan +3 more
arxiv +7 more sources
Noise in laser speckle correlation and imaging techniques [PDF]
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 ...
B. Weber +30 more
core +12 more sources
Speckle noise and dynamic range in coronagraphic images [PDF]
The Astrophysical Journal, 2007 This paper is concerned with the theoretical properties of high contrast coronagraphic images in the context of exoplanet searches. We derive and analyze the statistical properties of the residual starlight in coronagraphic images, and describe the effect of a coronagraph on the speckle and photon noise.
Claude Aime +4 more
arxiv +5 more sources
Real Time Speckle Image De-Noising [PDF]
Advances in Vision Computing: An International Journal (AVC)
Vol.1, No.1, March 2014, 2014 The paper presents real time speckle de-noising based on activity computation algorithm and wavelet transform. Speckles arise in an image when laser light is reflected from an illuminated surface. The process involves detection of speckles in an image by obtaining a number of frames of the same object under different illumination or angle and comparing
D.Sachin Kumar +3 more
arxiv +5 more sources
Speckle Statistics in Adaptively Corrected Images [PDF]
Astrophys.J.637:541-547,2006, 2005 (abridged) Imaging observations are generally affected by a fluctuating background of speckles, a particular problem when detecting faint stellar companions at small angular separations.
Aime C. +13 more
core +2 more sources
Polarimetric SAR Speckle Noise Model [PDF]
, 2003 Synthetic aperture radar (SAR) data are affected by speckle noise, originated by the SAR system's coherent nature. The problem of speckle noise in one-dimensional (1-D) data is already solved, as speckle has a multiplicative characteristic.
Fabregas Canovas, Francisco Javier +1 more
core +3 more sources
Three-dimensional curvelet-based dictionary learning for speckle noise removal of optical coherence tomography. [PDF]
Biomed Opt Express, 2020 Esmaeili M +3 more
europepmc +2 more sources
Computational approach for correcting defocus and suppressing speckle noise in line-field optical coherence tomography images. [PDF]
Biomed Opt ExpressAbbasi N, Chen K, Wong A, Bizheva K.
europepmc +2 more sources
Strategies for reducing speckle noise in digital holography. [PDF]
Light Sci Appl, 2018 AbstractDigital holography (DH) has emerged as one of the most effective coherent imaging technologies. The technological developments of digital sensors and optical elements have made DH the primary approach in several research fields, from quantitative phase imaging to optical metrology and 3D display technologies, to name a few.
Bianco V +8 more
europepmc +6 more sources
Noise filtering in solar speckle masking reconstructions [PDF]
Astronomy and Astrophysics Supplement Series, 1996 A new method of obtaining a sensitive noise filter for solar speckle masking reconstructions is presented below. This filter separates the true image information from noise most reliably. Its efficiency is demonstrated by some representative examples considering observed and artificial image data which were generated in a computer.
Charles R. de Boer
openalex +3 more sources