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 85 for “"Image Formation"”.
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Side scan sonar image formation, restoration and modelling.
… development of processing algorithms for sonar image enhancement. The thesis is divided into two principal parts. In the first part the statistical properties of side scan sonar images are analysed. Then, based on this analysis, a Maximum A Posteriori (MAP) formulation of the sonar image …
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Generating pictures from waves : aspects of image formation
… communities, technologies, and tools for image formation are diverse. On the one hand, computer vision and graphics researchers analyze incoherent light using coarse geometric approximations from optics. On the other hand, array signal processing and acoustics researchers analyze coherent …
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Topics in Image-Formation Algorithms for Synthetic Aperture Radar
Finally, we investigate image formation for highly squinted SAR that arises in runway imaging from an approaching aircraft. We explore theoretical feasibility of the runway-imaging scenario. We apply two image-formation algorithms: our general-inversion algorithm and the $\omega-k$ algorithm. The …
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Calibration and image formation in the ABACUS sonar system
Includes bibliographical references (leaves 138-139).
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Promotional impact of image formation of an aboriginal tourist destination.
… research is to present a thorough analysis of image formation among first-time visitors to an Aboriginal (Mi’kmaw) cultural site. The thesis is an initial attempt to examine theories in consumer behaviour and reformulate a model in the destination image literature to empirically test the …
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Real-time, Software-based Ultrasound Image Formation for Array Transducer Systems
… and less expensive. However, high resolution images needed in medical ultrasound rely on multichannel ultrasonic transducers requiring expensive, dedicated hardware to perform beamforming. This dissertation explores the reduction of hardware requirements for multi-channel ultrasound image …
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The pictorial element of destination promotions in tourist destination image formation
… of the pictorial element in destination image formation, and the factors affecting interpretation of visuals used in image advertising. This study has both theoretical and practical relevance as it seeks to integrate theoretical frameworks from tourist destination choice, advertising, and …
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Image formation using geometrical theory of diffraction and its applications to lithography
… OPTICAL SYSTEM AND COLLECTING THEM IN IMAGE SPACE, IT IS DISCOVERED THAT, IF THE</P><P>DIFFRACTED RAY FIELDS ARE SAMPLED ABOUT THE PENUMBRA REGIONS ABOVE SOME THRESHOLD</P><P>VALUE, 1D AND 2D IMAGE DISTURBANCES CAN BE CONSTRUCTED ENTIRELY FROM EDGE AND</P><P>VERTEX RAY CONTRIBUTIONS, …
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Joint anisotropy characterization and image formation in wide-angle synthetic aperture radar
Imagery formed from wide-angle synthetic aperture radar (SAR) measurements has fine cross-range resolution in principle. However, conventional SAR image formation techniques assume isotropic scattering, which is not valid with wide-angle apertures. Also, the spatial location of scattering centers …
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The development of a predictive autofocus algorithm using a general image formation model
… to the ratios of the Fourier transforms of images captured under different operating conditions. Methods are developed for working with these signals in a consistent manner. The model described is then applied to the problem of autofocus. A general autofocus algorithm is presented and …
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Assessing The Impact Of Movies Upon An Individual's Image Formation Concerning A Given Destination
… the ability to create or change an individual's image of a destination by its portrayal within the motion picture. This study was conducted in an effort to examine this global phenomenon called movie tourism and contribute to the tourism literature. This study focused on determining the …
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Synthetic Aperture Radar Image Formation for the Moving -Target and Near -Field Bistatic Cases
… which may cause artifacts in the reconstructed image. We then derive the band-limited property for BP methods in both monostatic and bistatic SAR imaging, which is the basis for developing the fast BP algorithm. We compare our algorithm with other frequency-domain based algorithms, and show that …
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Optimization of image formation in X-ray lithography using rigorous electromagnetic theory and experiments
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Adaptive, High-Resolution Ultrasound Phased Array Imaging for use in the Inspection of Laser Brazed Joints in the Automotive Sector
… separates the data acquisition process from the image formation process poses a viable solution to the inspection of laser brazed joints due to the ability to compensate for varying surfaces in post-processing.In this work, we make use of this technique, deriving the image formation process as an …
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Development of High Speed High Dynamic Range Videography
… to over 170 dB, about 31,000,000:1. The proposed formation methodology is adaptable to any camera combination, and almost any needed dynamic range. The dramatic increase in the dynamic range is made possible through an adaptation of the current high dynamic range image formation methodologies. Due …
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An empirical investigation of determinants of tourist destination image
… has demonstrated that tourism destination image is a valuable construct in investigating the destination selection process and behavior of travelers. Most studies of consumer decision making in tourism have investigated the relationship between image of a destination and preference or …
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Speckle reduction in SAR imagery
… and space-borne remote sensing. Inherent to SAR imagery is a type of multiplicative noise known as speckle. There are a number of different approaches which may be taken in order to reduce the amount of speckle noise in SAR imagery. One of the approaches is termed post image formation processing …
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Modeling and optimization of non-phased two-dimensional ultrasonic arrays.
Ultrasonic image acquisition with non-phased 2D arrays is a relatively new method in NDE inspection. Historically, ultrasonic array development progressed mostly in the medical imaging where phased arrays found a great application. However, in the field of NDE inspection of metals, heavy plastics …
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