ASIA unversity:Item 310904400/11492
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    题名: A Fast Calibrationless Method for Non-Linear Distortion Correction in Barcode Decoding:An Implementation of Industrial Aztec(ISO/IEC24778) 2D Barcode Decoder
    作者: I-CHUNG KUO
    贡献者: Department of Biomedical informatics?
    关键词: Non-Linear Distortion Correction;Radial Distortion;Calibrationless Correction Method;Trajectory Fitting;2D Barcode Decoding;Aztec
    日期: 2011
    上传时间: 2011-09-26 02:39:42 (UTC+0)
    出版者: Asia University
    摘要: In this study, we follow international standard ISO/IEC 24778 to design and implement, under an industrial vision development platform, a high-performance Aztec 2D barcode decoder with a new calibrationless correction method for non-linear distortion.
    The proposed correction method horizontally and vertically fits the edges of a non-linear distorted barcode images to two sets of trajectory equations, respectively. References of the trajectory behaviors are those four distorted barcode boundary lines, which were straight before distortion. These best-fit trajectory equations can thereafter be used to reverse the distortion.
    To simplify the derivation of the sets of the trajectory equations, a reasonable and practical assumption is given: curvature of horizontal or vertical sets of trajectories are changing linearly from top to bottom and from left to right boundaries of the given barcode image. By this assumption, these trajectory equations can be obtained by simple mathematics.
    In this method, conventional computation-intensive equation solving, e.g. multivariate nonlinear optimizations, is avoided. Thus, an industrial class of barcode reader system with computation-efficient, calibrationless, and real-time non-linear correction can be achieved.
    显示于类别:[生物資訊與醫學工程學系 ] 博碩士論文

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