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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/46365

    Title: Liquid-level measurement using a single digital camera
    Authors: Wang, Ti-ho;許陳鑑;Hsu, Chen-chien;Lu, Ming-chih;Chen, Cheng-chuan;Tan, Jia-dong
    Contributors: 淡江大學電機工程學系
    Keywords: Liquid level;Digital camera;Measurement system;Image;Subpixel resolution
    Date: 2009-05
    Issue Date: 2010-03-26 22:09:01 (UTC+8)
    Publisher: Elsevier
    Abstract: An imaged-based measurement system using a single digital camera and a circular float to measure fill levels in liquid tanks is proposed in this paper. By choosing the float in a different color from that of the liquid in the tank, pixel counts of the float in the image captured by the camera can be calculated with the use of chrominance filtering and thresholding techniques. Based on an established relationship between the pixel counts of the diameter of the float in the image and the photographing distance, the measuring system can effectively measure the liquid level based on the images captured. Because pixel counts of the float in the image are first determined for calculating the diameter of the float, a subpixel resolution during the measurement can be achieved. As a result, measuring precision as well as accuracy via the proposed system can be significantly improved.
    Relation: Measurement 42(4), pp.604-610
    DOI: 10.1016/j.measurement.2008.10.006
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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