Results 21 to 30 of about 66,156 (175)
Optimizing Ghost Imaging via Analysis and Design of Speckle Patterns [PDF]
, 2022 We study the influence rules of the speckle size of light source on ghost imaging, and propose a new type of speckle patterns to improve the quality of ghost imaging. The results show that the image quality will first increase and then decrease with the increase of the speckle size, and there is an optimal speckle size for a specific object.
arxiv +1 more source
Photon-Counting Security Tagging and Verification Using Optically Encoded QR Codes
IEEE Photonics Journal, 2014 We propose an optical security method for object authentication using photon-counting encryption implemented with phase encoded QR codes. By combining the full phase double-random-phase encryption with photon-counting imaging method and applying an ...
A. Markman, B. Javidi, M. Tehranipoor
doaj +1 more source
Speckle Filtering Impact on Land Cover Mapping Using the Combination of Sentinel-1 and Sentinel-2 Images (Case study: Bandar Mahshahr) [PDF]
Nīvār, 2022 Land use and land cover maps are essentially needed for socio-economic development and environment protection. Accurate and up to date maps play an important role in urban planning.
Mohammad Hossein Hajarian +2 more
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Methods for Determination of Mean Speckle Size in Simulated Speckle Pattern
Measurement Science Review, 2014 This paper deals with computation of mean speckle size in a speckle pattern generated through a numerical simulation of speckle after reflection of a Gaussian beam off a rough object’s surface. Within this simulation various speckle patterns are obtained
Hamarová I. +3 more
doaj +1 more source
Superpixel cosegmentation algorithm for synthetic aperture radar image change detection
The Journal of Engineering, 2019 Image segmentation has gained increasing popularity and has been widely applied in various image processing tasks recently. A simple linear iterative clustering (SLIC) superpixel generating algorithm for optical images based on k-means clustering ...
Ningyuan Shao +5 more
doaj +1 more source
Laser-induced speckle scatter patterns in Bacillus colonies
Frontiers in Microbiology, 2014 Label-free bacterial colony phenotyping technology called BARDOT (BActerial Rapid Detection using Optical scattering Technology) provided successful classification of several different bacteria at the genus, species, and serovar level. Recent experiments
Huisung eKim +3 more
doaj +1 more source
Customizing Speckle Intensity Statistics [PDF]
Optica, Vol. 5, Issue 5, pp. 595-600 (2018), 2017 We develop a general method for customizing the intensity statistics of speckle patterns on a target plane. By judiciously modulating the phase-front of a monochromatic laser beam, we experimentally generate speckle patterns with arbitrarily-tailored intensity probability-density functions. Relative to Rayleigh speckles, our customized speckles exhibit
arxiv +1 more source
Speckle‐Based Optical Cryptosystem and its Application for Human Face Recognition via Deep Learning
Advanced Science, 2022 Face recognition has become ubiquitous for authentication or security purposes. Meanwhile, there are increasing concerns about the privacy of face images, which are sensitive biometric data and should be protected. Software‐based cryptosystems are widely
Qi Zhao +9 more
doaj +1 more source
Photonics, 2023 A convolutional neural network (CNN) was used to identify the morphology of rough particles from their interferometric images. The tested particles had the shapes of sticks, crosses, and dendrites as well as Y-like, L-like, and T-like shapes.
Alexis Abad +5 more
doaj +1 more source
Singularities in Speckled Speckle: Screening [PDF]
, 2008 We study screening of optical singularities in random optical fields with two widely different length scales. We call the speckle patterns generated by such fields speckled speckle, because the major speckle spots in the pattern are themselves highly speckled.
arxiv +1 more source