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 20 of 21 for “"Phase unwrapping"”.
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A Study of 2-D Phase Unwrapping
Finally, multibaseline phase unwrapping for InSAR processing is discussed. An MAP approach is proposed to overcome the drawbacks of the conventional maximum likelihood (ML) approach. The optimal choice of baselines is derived.
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Absolute distance contouring and a phase unwrapping algorithm for phase maps with discontinuities.
… technique, absolute distance contouring, and a phase unwrapping algorithm for phase maps with discontinuities. Absolute distance contouring, which is based on the shadow moire method, using the rotation of a grating, is a technique which can be used for the measurement of absolute distance from …
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Phase projection using three satellites
… Synthetic Aperture Radar (InSAR) during the phase unwrapping process and the noise filtering step. In particular, as intuition would follow, we establish that the advantage of using three satellites over using just two in noise reduction means that using three satellites should be the way to …
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DEVELOPMENT OF PHASE RETRIEVAL TECHNIQUES IN DISPLACEMENT AND DISPLACEMENT DERIVATIVES MEASUREMENT
… based fringe analysis technique are proposed for phase derivatives determination. A derivative based simplified phase tracker model is proposed for phase demodulation from a single fringe pattern. In time-average speckle interferometry, novel amplitude varied refreshing reference frame technique …
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Synthetic Aperture Radar Interferometry with 3 satellites
… method, which seeks to ease the reliance on phase unwrapping steps often necessary in retrieving height. It does so by expanding the wrapped phase range without performing any phase unwrapping, through the use of different wrapping speeds of the 3 sets of satellite pairings. The third method …
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Topics in CT and SAR Imaging: Fast Back -Projection Algorithms and Optimal Antenna Spacings
… study is motivated by the investigation of the phase unwrapping problem in 3-D SAR imaging. In this thesis, we study the optimal antenna spacings for pointwise terrain height estimation. In particular, we start from the maximum likelihood estimates of the terrain height. The ambiguous terrain …
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Algorithms for 3D time-of-flight imaging
… an improved method for simultaneously performing phase unwrapping and denoising for sinusoidal amplitude modulated continuous wave ToF cameras using multiple frequencies. The first application uses several unfocused photodetectors with high time resolution to estimate information about features in …
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Digital Holographic Micro-Interferometery for the Measurement of the Refractive Index of Biological Cells
… Moreover, in order to extract the interference phase from the recorded holograms, a program that applies Fourier fringe analysis to extract wrapped phase image and quality-guided phase unwrapping program were implemented in LabVIEW®. From the three different interference phase distributions of …
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The Development of Quasi-Optical Techniques for Log Wavelength Imaging
… design and analysis of discrete and continuous phase modulating optical multiplexers (phase gratings) for use at 100 GHz. The use of GBMA for iterative phase retrieval was investigated for application to phase grating design. Several phase unwrapping techniques were also investigated in order to …
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Movements in Binaural Space: Issues in HRTF Interpolation and Reverberation, with applications to Computer Music
… the literature, a reappraisal of the minimum-phase plus linear delay model for HRTF representation and interpolation is offered. A rigorous analysis of threshold based phase unwrapping is also performed. The results and conclusions drawn from these analyses motivate the development of two …
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Advances in Telecentric Digital Holographic Microscopy: From Theoretical Foundations to Biomedical Applications
… optimizing this approach, TDHM achieves superior phase stability and image quality compared to conventional methods. Additionally, this design facilitates the integration of TDHM with other microscopic techniques, enhancing its versatility in biomedical imaging. The core of the technological …
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Digital Hologram Image Processing
… the functionality of accurately reconstructing phase, is achieved through using an in-line architecture. Two of the most significant problems encountered with reconstructions of in-line digital holograms include the small depth-of-field of each reconstruction and corruptive influence of the …
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The numerical synthesis and inversion of acoustic fields using the Hankel transform with application to the estimation of the plane wave reflection coefficient of the ocean bottom
… and uncontrolled variations in source-height. A phase unwrapping and associated interpolation scheme is developed to handle improperly spaced data. A preliminary inversion of real pressure field data is performed. In parallel, an inversion of a synthetically generated field for similar bottom …
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Fourier Transform Interferometry for 3D Mapping of Rough and Discontinuous Surfaces
… and high resolution. FTI generates continuous-phase surface maps from a projected optical interference pattern, which is generated with a simple double-pinhole source and collected in a single snapshot using conventional digital camera technology. For enhanced stability and reduced system size, …
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4D flow and displacement sensitive MR imaging of upper arm arterio-venous connections for haemodialysis
… remains unblocked and the flow rate is normal. Phase Contrast MRA (PC-MRA) is a versatile Magnetic Resonance Imaging (MRI) modality which is capable of imaging and quantifying blood flow in vivo. It is for this reason that this imaging technique was used to image blood flow in the vasculature of …
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Digital Holography and Optical Contouring
… the use of noise reduction filters, different phase unwrapping algorithms, the application of the super-resolution method, and errors in the illumination angle. Practical 3D measurement of a real object, of known geometry, is used as a benchmark for the accuracy improvements achievable via the …
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Novel methods for recording and reconstructing images in digital holographic microscopy
… without the need for labeling. Examples include phase contrast, differential interference microscopy, dark field microscopy, and Rheinberg illumination. However, these techniques are qualitative in nature and do not provide any direct measurement of cellular morphology in terms of thickness or …
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Real-time quantitative phase imaging for cell studies
… to reveal the endogenous contrast, such as phase contrast microscopy (PCM) and differential interference contrast (DIC) microscopy. Although PCM and DIC methods significantly improve the image contrast without the need for staining agents, they only provide qualitative information about the …
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