Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"phase correlation"”.
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Development of Robust Correlation Algorithms for Image Velocimetry using Advanced Filtering
… explores the potential of a variety of cross-correlation filters to improve the accuracy and robustness of the DPIV estimation. These techniques incorporate the use of the Phase Transform (PHAT) Generalized Cross Correlation (GCC) filter applied to the image cross-correlation. The use of …
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Optical detection development for the Hogan quantum holographic noise experiment
… a photodetection system to measure broadband phase correlation between two optical signals, to be used in the noise detection experiment. This included modifying and characterizing photodetectors and setting up a system to record the signal correlation between the two detectors. We altered a …
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Computational Complexity Optimization on H.264 Scalable/Multiview Video Coding
… to manage the reference frame efficiently, a phase correlation algorithm is utilized to remove the inefficient inter-view reference frame from the reference list. The dependency between the inter-view reference frame and current frame is decided based on the phase correlation coefficients. If …
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Target detection through quantum illumination
… object. It has been shown theoretically that the correlation between entangled photons can be used to better discriminate between the signal photons reflected by an object and noise photons, thus reducing the probability of error [13, 15, 17, 7, 6]. This thesis presents the first experimental …
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RST invariant digital image watermarking
… spectrum of original image, and use the phase correlation between the LPM of the original image and the LPM of the watermarked image to calculate the displacement of the watermark positions in LPM domain. The exhaustive search method is used to retrieve the watermark if the original image …
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External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics
… the temporal beating resulting from the phase correlation among wavelength channels. This results in a slow gain depletion mitigating nonlinearities and gain competition among wavelength channels in the SOA supporting the multiwavelength operation of the laser. Numerical simulations …
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Integrated computational system for portable retinal imaging
… shape and size; performs local integration with phase correlation; and performs global integration with panoramic mosaicing. Through this process we can increase signal to noise ratio, increase image contrast, create super-resolution images, and obtain a large field of view image of the retina. …
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Entrainment Characteristics of Turbulent Round Gas Jets Submerged in Water
The entrainment process in two-phase buoyant jets differs significantly from their singlephase counterparts, and is not well understood. Entrainment models developed for singlephase flow are often used in two-phase jetting simulations, albeit with limited success. In this work, Particle Image …
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An earth image simulation and tracking system for the Mars Laser Communication Demonstration
… algorithm, cross-spectrum phase correlation method, and optical flow algorithm were all tested under various Earth phase conditions and pixel resolutions to evaluate their performance on simulated test data, the thresholded-centroiding algorithm was eventually chosen for its …
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Depth information from image sequences using two-dimensional cepstrum
… is more robust and noise tolerant than the usual phase correlation technique. The computation time required by the power cepstrum has been further reduced by using a Hartley-like transform that maps a real-valued sequence to a real-valued spectrum while preserving the useful properties of the …
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Analysis of interferometric SAR for topographic mapping
… (InSAR). The procedure uses the difference of phase measurements of the received radar signals at two antennas separated slightly in the cross-track direction, to determine the elevations more accurately than stereo SAR mapping, which uses SAR intensity images. The SAR phases are more sensitive …
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An Analysis of Rigid Image Alignment Computer Vision Algorithms
… and the Fast Fourier Transform (FFT) based phase correlation algorithm. The software for registering images using these two methods is written in MATLAB R2011a. We also compared our results with alignments achieved for the same images using an existing Statistical Parametric Mapping (SPM8) …
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Time Series Analysis of the A0 Supergiant HR 1040
… events. The star was found to have an active phase with large variation in the physical characteristics of the windand with the potential for HVAs. During the active phase, correlation between the H¿¿ absorption equivalent width and blue-edge radial velocity was observed. If an HVA was …
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Phenomenological phase-fluctuation model for the underdoped cuprates
In this thesis, a phenomenological phase-fluctuation model for the pseudogap regime of the underdoped cuprates was discussed. The key idea of the phase-fluctuation scenario in the high-T_c superconductors is the notion that the pseudogap observed in a wide variety of experiments arises from phase …
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Renal Cryoablation: Investigation of Periprocedural Visualization to ols and Treatment Response Quantification
<p>Cryoablation for small renal tumors has demonstrated sufficient clinical efficacy over the past decade as a non-surgical nephron-sparing approach for treating renal masses for patients who are not surgical candidates. Minimally invasive percutaneous cryoablations have been performed with image …
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Highly Accurate Ultrasonic Positioning and Tracking Systems
… system. The localization process has two main phases: firstly, the measurement phase, that establishes a relationship in terms of the distance and/or angle between the targets(s) to be localized and the system infrastructure; and secondly, the positioning phase, that exploits the measured …
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Relazione gestante-feto, modalità del parto e sviluppo fisico del bambino
… in the longitudinal study. In the first phase of this study (third trimester of the pregnancy), it has investigated the psychological processes connected to the affective investment of the pregnant women towards the unborn baby (by Prenatal Attachment Inventory), the mothers’ interiorized …