"The high resolution target movement monitor (HRTMM) was developed at the Missouri University of Science and Technology to detect and measure wall movements in underground mines to help reduce fatality and injury rates. The system detects the movement of a target with submillimeter accuracy based on the images of one or more laser dots projected on the target and viewed by a high-resolution camera. The relative position of the centroid of the laser dot in the images corresponds to target movement. The centroid position is determined by customized software that uses ImageMagick. Prior versions of the HRTMM set the image threshold and window size based on a manual, visual examination of the images.
This work systematically examines the effect of a varying threshold on the calculated centroid position. First, the software is modified to function in a batch of images without human intervention. The same software is developed using OpenCV to eliminate the need to input parameter window size and to improve the performance speed. The ImageMagick and OpenCV results are compared in the various experiments. Second, the thresholding effects on the centroid position are determined for various target positions. The centroid positions are plotted as a function of varying thresholds to identify a range of thresholds for which the centroid position does not change significantly for normal lighting conditions. This work also proposes methods to determine the threshold ranges for various combinations of HRTMM components"--Abstract, page iii.
Moss, Randy Hays, 1953-
Watkins, Steve Eugene, 1960-
Electrical and Computer Engineering
M.S. in Electrical Engineering
Missouri University of Science and Technology
viii, 61 pages
© 2009 Deepti Bairineni, All rights reserved.
Thesis - Restricted Access
Ground control (Mining) -- Instruments
Lasers -- Measurement
Mine safety -- Equipment and supplies
Print OCLC #
Link to Catalog Record
Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b7077082~S5
Bairineni, Deepti, "Effect of threshold in a high resolution target movement monitor in underground mines" (2009). Masters Theses. 83.
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