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You searched for +publisher:"University of Notre Dame" +contributor:("Robert L. Stevenson, Committee Chair"). Showing records 1 – 2 of 2 total matches.

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University of Notre Dame

1. Ruiwen Zhen. Enhanced Raw Image Capture and Deblurring.

Degree: MSin Electrical Engineering, Electrical Engineering, 2013, University of Notre Dame

Camera motion blur is a common problem in low-light imaging applications. Over the year numerous algorithms have been developed to deblur the image and provide a visually pleasing capture of the sensed scene. Many of these algorithms require that the blur kernel is known a priori which limits their application in many real-world situations. Recently, inertial sensors have been utilized in an attempt to estimate a blur kernel that can then be incorporated into deblurring algorithms to provide improved results. However, the effectiveness of these algorithms has been limited by lack of access to unprocessed raw image data obtained directly from the image sensor. In this thesis, we build an digital imaging system for the acquisition of raw im- age data in conjunction with 3-axis acceleration data. From the acceleration data camera motion during image capture can be estimated to provide information about blurring of the sensed scene. This blur kernel is used in a maximum a posteriori esti- mation algorithm to deblur the raw image data. Experiments demonstrate that the accelerometer-based deblurring algorithm on raw image data can generate improved results. Advisors/Committee Members: Robert L. Stevenson, Committee Chair, Ken Sauer, Committee Member, Patrick Flynn, Committee Member.

Subjects/Keywords: image deconvolution; PSF estimation; Bayer Pattern data; FPGA

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APA (6th Edition):

Zhen, R. (2013). Enhanced Raw Image Capture and Deblurring. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/sq87br88s0k

Chicago Manual of Style (16th Edition):

Zhen, Ruiwen. “Enhanced Raw Image Capture and Deblurring.” 2013. Masters Thesis, University of Notre Dame. Accessed November 22, 2018. https://curate.nd.edu/show/sq87br88s0k.

MLA Handbook (7th Edition):

Zhen, Ruiwen. “Enhanced Raw Image Capture and Deblurring.” 2013. Web. 22 Nov 2018.

Vancouver:

Zhen R. Enhanced Raw Image Capture and Deblurring. [Internet] [Masters thesis]. University of Notre Dame; 2013. [cited 2018 Nov 22]. Available from: https://curate.nd.edu/show/sq87br88s0k.

Council of Science Editors:

Zhen R. Enhanced Raw Image Capture and Deblurring. [Masters Thesis]. University of Notre Dame; 2013. Available from: https://curate.nd.edu/show/sq87br88s0k


University of Notre Dame

2. Jonathan Simpkins. Modeling and Estimation of Spatially-Varying Point-Spread Functions due to Lens Aberrations and Defocus.

Degree: MSin Electrical Engineering, Electrical Engineering, 2011, University of Notre Dame

Many image restoration and analysis approaches in the literature rely on an accurate characterization of the linear blur kernel for an image, the point-spread function (PSF). Existing PSF models are either parameterized and spatially-invariant, or spatially-varying and discretely-defined. In this thesis, we propose a parameterized, spatially-varying PSF model to describe the blur due to lens aberrations and defocus. The model follows from the combination of several geometric camera models, and the Seidel third-order aberration model. We propose a novel estimation algorithm for computing the parameters of the aberration model from a set of PSF observations, and we demonstrate through simulation that this yields a more reliable set of PSF estimates. In simulated PSF sets with spread measure noise as strong as 10 dB SNR, the proposed model consistently led to PSF estimates with a 5 dB SNR improvement over the observations, and typically a 10 dB SNR improvement. Advisors/Committee Members: Dr. Robert L. Stevenson, Committee Chair, Dr. J. Nicholas Laneman, Committee Member, Dr. Ken Sauer, Committee Member.

Subjects/Keywords: point-spread functions; Seidel aberrations; image deconvolution

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Simpkins, J. (2011). Modeling and Estimation of Spatially-Varying Point-Spread Functions due to Lens Aberrations and Defocus. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/k3569309343

Chicago Manual of Style (16th Edition):

Simpkins, Jonathan. “Modeling and Estimation of Spatially-Varying Point-Spread Functions due to Lens Aberrations and Defocus.” 2011. Masters Thesis, University of Notre Dame. Accessed November 22, 2018. https://curate.nd.edu/show/k3569309343.

MLA Handbook (7th Edition):

Simpkins, Jonathan. “Modeling and Estimation of Spatially-Varying Point-Spread Functions due to Lens Aberrations and Defocus.” 2011. Web. 22 Nov 2018.

Vancouver:

Simpkins J. Modeling and Estimation of Spatially-Varying Point-Spread Functions due to Lens Aberrations and Defocus. [Internet] [Masters thesis]. University of Notre Dame; 2011. [cited 2018 Nov 22]. Available from: https://curate.nd.edu/show/k3569309343.

Council of Science Editors:

Simpkins J. Modeling and Estimation of Spatially-Varying Point-Spread Functions due to Lens Aberrations and Defocus. [Masters Thesis]. University of Notre Dame; 2011. Available from: https://curate.nd.edu/show/k3569309343

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