| Summary: | 碩士 === 國立交通大學 === 多媒體工程研究所 === 99 === The goal of this thesis is to enhance the visibility of the images of license plates at far distances, and to reduce the over-exposure defects for similar images taken near a camera with an illuminator with fixed intensity, by applying an innovative, multi-intensity IR illuminator for night-time video surveillance. Based on an analysis of the stroke width of characters of the license ID, license plates at various distances can be detected under different illumination intensities. Since images obtained with different illumination conditions may contain useful information for different regions interest, best images of license plates are identified for each illumination condition and integrated into a high dynamic range (HDR) representation for easy inspection and examination. Experimental results show that the proposed approach can increase the monitored area both in depth and in width, and enhance the security level of night-time surveillance.
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