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http://dx.doi.org/10.7319/kogsis.2015.23.1.129

Changes in the Number of Matching Points in CCTV's Stereo Images by Indoor/Outdoor Illuminance  

Moon, Kwang Il (Dept. of Civil Engineering, Konkuk University)
Pyeon, Mu Wook (Dept. of Civil Engineering, Konkuk University)
Kim, Jong Hwa (Dept. of Advanced Technology Fusion, Konkuk University)
Kim, Kang San (Dept. of Civil Engineering, Konkuk University)
Publication Information
Journal of Korean Society for Geospatial Information Science / v.23, no.1, 2015 , pp. 129-135 More about this Journal
Abstract
The Ubiquitous City (U-City) spatial information technology aimed to provide services freely anytime and anywhere by converging high-tech information & communication technology in urban infrastructure has been available in diverse patterns. In particular, there have been studies on the development of 3D spatial information after selecting and matching key points with stereo images from the many Closed Circuit TV (CCTV) in the U-City. However, the data mostly used in extracting matching points haven't considered external environmental impacts such as illuminance. This study tested how much the matching points needed to construct 3D spatial information with the CCTV whose image quality is dependent upon changes in illuminance fluctuate under the same hardware performances. According to analysis on the number of matching points by illuminance, the number of matching points increased up to 3,000Lux in proportion to the illuminance when IRIS, shutter speed and ISO were fixed. In addition, a border between an object and background became more distinctive. When there was too much light, however, the page became brighter, and noise occurred. Furthermore, it was difficult to name key points because of the collapse of an inter-object border. It appears that if filmed with the study results, the number of matching points would increase.
Keywords
Stereo Image; Illuminance; Matching; SIFT;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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