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Gis-Based Evaluation Of Mid-Block Pedestrian Crossing Safety, Zhenzhong Cui
Gis-Based Evaluation Of Mid-Block Pedestrian Crossing Safety, Zhenzhong Cui
UNLV Retrospective Theses & Dissertations
Transportation related problems have become one of the most pressing and visible concerns of urban life. One major aspect of safety relates to pedestrian crossings, especially pedestrian crossings away from an intersection i.e. at mid-block locations. There is need to develop a program to address mid-block pedestrian crashes (MBPC) to better understand them. This thesis describes the development of set of tools designed to help better understand MBPCs. Included are general statistical methods, GIS database, and visualization interface software; This thesis evaluates the potential of spatial clustering techniques and nearest neighbor methods to identify areas where high concentrations of mid-block …
Ocr-Directed Evaluation Of Binarization Techniques, Diego Antonio Vinas
Ocr-Directed Evaluation Of Binarization Techniques, Diego Antonio Vinas
UNLV Retrospective Theses & Dissertations
The objective of this work is to study different binarization methods and to investigate their effect on the performance of OCR systems. Two sets of document images and four OCR systems were used to study several binarization algorithms. The simplest method that chooses the median value of the gray levels, i.e., 127 from 256 levels, as the global threshold value did not work well unless the scanner characteristic matched with the nature of a collection of documents by chance. The best-fixed method uses the global threshold value that minimizes the number of overall errors for a combination of an OCR …