The problem addressed in this dissertation is the hierarchical analysis of visual motion. Visual motion is a fundamental task at any low level visual system. Visual perception and motion are linked in a single model that verifies Daugman's properties for visual processing. Following the neurophysiological hypothesis of hexagonal tesselation of the visual plane, an heptarchy was built that verifies this hypothesis. The model of the receptive fields at the level of the striate cortex, more especially at the level of the simple cells, was realized. A pyramidal implementation of the Walsh Transform was performed. A Fourier analysis of the SC, or the Synaptic Links, is implemented and an agreement between the results obtained and the neurophysiological data of the receptive fields is confirmed. The set of operators obtained were applied on different kinds of geometric moving objects and excellent results were obtained. This first model corresponds to the Component Direction Selective (C.D.S.) type of neurons. A second stage of disambiguation is necessary at the level of the MT to solve the ambiguity problem. This stage corresponds to the Pattern direction selectivity (P.D.S.) type of neurons, having for inputs the Component Direction Selective type of neurons. / A hierarchical cross correlator in hexagonal grid has been realized and applied to the same moving objects mentioned above. The results of this hierarchical correlator are compared with a serial correlator and the improvement of time computation is shown. This motion analyzer gives the direction of motion of the whole object. It is a viable and simpler alternative to the first model which makes the task needlessly difficult. If the first stage of motion analysis is non-oriented, this model should have no problem in computing the pattern's motion. / The results of the two models are confronted and the linkage between the two stages of the first model at the neuronal level is still an important step to be solved by neurophysiologists. / Source: Dissertation Abstracts International, Volume: 49-08, Section: B, page: 3299. / Major Professor: Abraham Kandel. / Thesis (Ph.D.)--The Florida State University, 1988.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_77842 |
| Contributors | Meghabghab, George V., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 537 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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