Results 31 to 40 of about 5,296,113 (405)
Circumventing the optical diffraction limit with customized speckles [PDF]
Optica Vol. 8, Issue 2, pp. 122-129 (2021), 2020 Speckle patterns have been widely used in imaging techniques such as ghost imaging, dynamic speckle illumination microscopy, structured illumination microscopy, and photoacoustic fluctuation imaging. Recent advances in the ability to control the statistical properties of speckles has enabled the customization of speckle patterns for specific imaging ...
arxiv +1 more source
Optics Express, 2019 The performance of digital image correlation is closely associated with the quality of speckle pattern. In this paper, the performance of digital speckle pattern is analyzed theoretically concerning four critical factors: uniqueness, accuracy, precision,
Yong Su +6 more
semanticscholar +1 more source
Twist-Related Speckle Variation in Graded-Index Multimode Fiber
IEEE Photonics Journal, 2018 We theoretically investigate a twist-related speckle variation in a graded-index multimode fiber. The simulation results show that by increasing the offset splicing distance between a single-mode fiber and a multimode fiber, the speckle pattern tends to ...
Hongye Li +4 more
doaj +1 more source
All Optical Speckle Contrast-Based Vibration Sensor for Photoacoustic Signal Detection
Sensors, 2022 Remote detection of photoacoustic signals is a well desired ability, enabling to perform advanced imaging in scenarios where contact is not possible. Various unique solutions have been suggested, including a camera-based speckle contrast photoacoustic ...
Matan Benyamin, Zeev Zalevsky
doaj +1 more source
Optical Engineering: The Journal of SPIE, 2019 . Wavelets shrinkage is the most illustrative of wavelets transform for speckle noise reduction. We aim to study the performance of a monogenic wavelet transform to reduce the speckle noise in digital speckle pattern interferometric fringes. The proposed
Sara Zada +4 more
semanticscholar +1 more source
Optical 3-D surface reconstruction with color binary speckle pattern encoding.
Optics Express, 2018 This paper proposes a novel 3-D surface profile measurement scheme by only a single-shot color binary speckle pattern (CBSP) and a temporal-spatial correlation matching algorithm, which can be applied to measurements of dynamic and static objects.
Pei Zhou, Jiangping Zhu, Hailong Jing
semanticscholar +1 more source
IEEE Photonics Journal, 2019 Target tracking and imaging through scattering media are challenges that must be overcome for important applications in various fields. The fundamental problem is the randomly diffused light in scattering media that prevents the formation of diffraction ...
Yingbo Wang +5 more
doaj +1 more source
A new simulation method for laser speckle imaging to investigate hemodynamics [PDF]
E3S Web of Conferences, 2019 Speckle simulation is a powerful protocol to investigate the properties of speckle and evaluate image processing method. However, only static speckle images can be simulated by available methods without considering time-integrated effect of CCD.
Sang X, Li D, Chen B
doaj +1 more source
Review of laser speckle contrast techniques for visualizing tissue perfusion [PDF]
, 2008 When a diffuse object is illuminated with coherent laser light, the backscattered light will form an interference pattern on the detector. This pattern of bright and dark areas is called a speckle pattern.
A Sadhwani +59 more
core +6 more sources
Semiclassical theory of speckle correlations [PDF]
, 2013 Coherent wave propagation in random media results in a characteristic speckle pattern, with spatial intensity correlations with short-range and long-range behavior. Here, we show how the speckle correlation function can be obtained from a ray picture for
Breitkreiz, Maxim, Brouwer, Piet W.
core +2 more sources