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 11 of 11 for “"Poisson noise"”.
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Double Alternating Minimization (DAM) for Phase Retrieval in the Presence of Poisson Noise and Pixelation
… not consider the detector sampling rate and shot noise introduced by photon detection. If the sampling rate is low, we must interpolate the detected image in order to accurately reconstruct its pupil function. Here, we develop an appropriate estimation method for interpolating the detected image …
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Mild solutions of SPDE's driven by Poisson noise in infinite dimensions and their dependence on initial conditions
… X(0)=g, where q(dt,dy) is a compensated Poisson random measure associated to a stationary Poisson point process on a [sigma]-finite measure space (U,C,m), A is the generator of a strongly continuous semigroup, F is a measurable mapping from H to H, B is a measurable mapping from the …
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Computational 3D and reflectivity imaging with high photon efficiency
… and reflectivity images is difficult due to the Poisson noise inherent in low-flux operation. In this thesis, we propose and study two computational imagers (one passive, one active) that can form accurate images at low light levels. We demonstrate the superior imaging quality of the proposed …
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A near-optimal wavelet-based estimation technique for video sequences
… of a video signal given a data set with Poisson noise. The cameras used in creating video sequences are often charge-coupled devices, which produce data by way of a counting process, leading to noise with a Poisson distribution. Because many applications using video require data with less …
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Estimation theoretical image restoration
… monochromatic. Using a mixture of Gaussian and Poisson noise process, we derived an objective function to estimate the unknown object and point spread function (psf) parameters. We have found that, without constraint enforcement, this blind deconvolution algorithm tended to converge to the …
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Spatial summation in the dark-adapted fovea
… and were therefore not solely limited by Poisson noise, but rather also limited by uncertainty. 2) Detection was not significantly impacted by color reports, and color reports were not significantly different whether or not detection certainty was also reported. Thresholds were actually …
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First-order gradient regularisation methods for image restoration: reconstruction of tomographic images with thin structures and denoising piecewise affine images
… term, which serves as an approximation to the Poisson noise model for PET. We establish the well-posedness of this new model for functions of Bounded Variation (BV) and perform an error analysis through the notion of the Bregman distance. We examine analytically how TV regularisation on the …
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The Growth of Brightest Cluster Galaxies and Intracluster Light in X-ray Selected Clusters
… include field PSF convolutions and an idealised Poisson noise component. We find that we are able to recover our SDSS r-band profiles (with similar results in i and g) accurately out to ~ 16.5 magnitudes; fainter than this, we begin to observe biases in our results, especially in recovered Sersic …
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Alternating Minimization Algorithms for Dual-Energy X-Ray CT Imaging and Information Optimization
… the component images in the presence of Poisson noise.</p><p>This work also explored the reconstruction of image differences from tomographic Poisson data. An alternating minimization algorithm was developed and monotonic decrease in the objective function was achieved for each iteration. …
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On-board Robotic Multi-pinhole SPECT System for Region-of-interest (ROI) Imaging
… line-source width, intrinsic camera resolution, Poisson noise and acquisition geometry. In computer-simulation studies, when there was no error in determining angles (α) and offsets (ρ) of the measured projections, the six alignment parameters (3 translational and 3 rotational) were estimated …
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In silico modelling to advance arterial spin labelling magnetic resonance imaging
… capillary blood flow as these reduced regional Poisson noise to within 10%. The incorporation of tissue deformations (due to gravity) into the model increased both the gradient and heterogeneity of capillary blood flow estimation using microspheres. For the unfiltered ASL MRI signals, a better …