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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

The visual perception of distance in action space

Wu, Bing, January 2004 (has links) (PDF)
Thesis (Ph. D.)--University of Louisville, 2004. / Department of Psychological & Brain Sciences. Vita. "May 2004." Includes bibliographical references (leaves 105-111).

An investigation of methods for determining depth from focus

Ens, John E. January 1990 (has links)
The concept of depth from focus involves calculating distances to points in an observed scene, by modelling the effect that the camera's focal parameters have on images acquired with a small depth of field. This technique does not require special scene illumination, and needs only a single camera. This thesis provides a background understanding of the concept and theory of depth from focus, surveys the literature on current methods of obtaining depth from focus, analyzes the key problems, and presents a novel solution to the problem, complete with experimental results. Deconvolving and modelling the defocus operator, is the most difficult segment of calculating depth from focus. Isolating the defocus operator has conventionally been performed by taking local spatial regions, and inverse filtering in the spatial frequency domain. This thesis exposes some fundamental problems with this method: inaccuracies in finding the frequency domain representation and the presence of border effects. To solve the general depth from focus problem, a novel application of an iterative matrix based method is presented. This method uses two images of the same scene, obtained under different conditions of defocus. The defocus operator may be assumed using a parametric model, or experimentally measured. Trade-offs in implementation are resolved through regularization. The method is theoretically justified, and shown to eliminate the problems mentioned above. A constrained inverse filtering method and the author's iterative matrix based method are experimentally implemented on four scenes. The experiments show the iterative matrix solution consistently yielding more accurate results. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Factors affecting item acquisition performance in hierarchical systems : depth vs. breadth /

Miller, Dwight Peter January 1980 (has links)
No description available.

Intelligent signal processing of evoked potentials for control of anaesthesia

Elkfafi, Magdy January 1995 (has links)
No description available.

The Slant Aftereffect : slants about the horizontal and vertical axes, cyclotorosion and the vertical horopter

Hill, Louise E. January 1996 (has links)
No description available.

The use of the electroencephalogram and auditory evoked potentials to assess the depth of anaesthesia and effects of anaesthetic agents in the laboratory rat (Rattus norvegicus)

Antunes, Luis Marques January 2001 (has links)
No description available.

Depth Dependence Study of Shallow Water Ambient Noise

Chen, Yung-Chien 29 July 2002 (has links)
Of all the forms of radiation known, sound travels through the sea the best, therefore it is widely used in underwater detection and signal transmission. However, the ambient noise in the ocean will affect the quality of these applications, so that understanding of ambient noise is important for improving acoustic capability. Previous literatures show that ambient noise at deep water should decrease with depth, but would it be the same in the shallow? Most studies of ambient noise were made at deep water in the past, the reason is that great depth variation of ambient noise is easily observed. The ASIAEX 2001 South China Sea experiment is on the continental shelf-break, so the depth effect of ambient noise in shallow water can be explored. A typhoon shall affect experimental zone during May 10-14, 2001. From the results of this study, afternoon effect shall affect distribution of temperature and ambient noise under water depth. The other, a typhoon can not only affect seriously ambient noise, but also intercept the shine and variation of sea temperature, and reduce afternoon effect. Another, ambient noise has insignificant change with depth, however it¡¦s is much affected by the variation of temperature, frequency, and occurrence of internal wave.

Determinants of perceived depth 1st- vs. 2nd-order contributors /

Harris, Yoela. January 1999 (has links)
Thesis (M.A.)--York University, 1999. Graduate Programme in Psychology. / Typescript. Includes bibliographical references (leaves 97-104). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pMQ56179.

Evolved navigation theory and the environmental vertical illusion

Jackson, Russell Eric 28 August 2008 (has links)
Not available / text

Evolved navigation theory and the environmental vertical illusion

Jackson, Russell Eric, 1978- 23 August 2011 (has links)
Not available / text

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