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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/11099


    Title: 使用線對應之透視畸變修正法於條碼解讀實現工業級二維條碼PDF417(ISO/IEC15438)解碼器
    Authors: 陳桓榆
    Contributors: Department of Biomedical informatics?
    Keywords: 透視畸變;二維條碼;解碼;線對應;ISO/IEC 15438;PDF417
    Date: 2011
    Issue Date: 2011-09-09 06:27:54 (UTC+0)
    Publisher: Asia University
    Abstract: 本研究依照國際標準ISO/IEC 15438以工業電腦視覺開發平台,設計與實現基於線對應自動快速修正透視畸變(perspective distortion)之工業級PDF417解碼系統。本研究利用解讀條碼時的二種特性簡化畸變修正過程,達到無需系統校正的快速修正:一、條碼多為矩形或正方形,具有四條明顯的外框線;二、外觀比例並不影響解碼;因此可預設轉換後的長寬比及四條外框線的相對位置;此二特性可提供轉換前後四組完整的直線對應關係(Line correspondence),此四組線提供了足夠的資訊供程式即時計算出透視畸變轉換矩陣,進而完成反轉換。此法相較基於點對應的透視畸變修正法更為準確及合理。測試結果顯示:本系統無須事先校正即可快速且精確地修正實用時常發生的透視畸變問題,增加條碼解碼器的強固性。
    Appears in Collections:[生物資訊與醫學工程學系 ] 博碩士論文

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