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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/32624


    Title: 干擾狀況下的交通標誌偵測與辨識
    Authors: 楊修銘
    Yang,Hsiu-Ming
    Contributors: 劉昭麟
    Liu,Chao-Lin
    楊修銘
    Yang,Hsiu-Ming
    Keywords: 交通標誌辨識
    圖形辨識
    影像處理
    Traffic Sign Recognition
    Pattern Recognition
    Image Processing
    Date: 2003
    Issue Date: 2009-09-17 13:52:53 (UTC+8)
    Abstract: 在不利的環境下做交通標誌的偵測與辨識是一件非常艱困的工作，無論在郊區或市區，複雜的環境、天候、陰影以及任何和光線有關的因素甚至是交通標誌遭到遮蔽都將使得偵測與辨識交通標誌變得相當困難。在本篇論文中，我們定義出較寬鬆的顏色分類(color thresholding)方法，配合一些交通標誌的特徵(如外形)來實作出召回率(Recall)較高的偵測系統，另外在辨識方面，最重要的是找出好的辨識特徵，因此我們利用離散餘弦轉換(discrete cosine transform)和奇異值分解(singular value decomposition)處理待辨識標誌擷取其特徵，並配合一些其他的交通標誌特徵，當作類神經網路(ANN)、naïve Bayes classifier等辨識方法的輸入，來幫助我們完成辨識的工作。目前實作出來的系統在有挑戰性的測試資料下有七成六左右的辨識率。
    Robust traffic sign recognition can be a difficult task if we aim at detecting and recognizing traffic signs in images captured under unfavorable environments. Complex background, weather, shadow, and other illumination-related problems may make it difficult to detect and recognize signs in the rural as well as the urban areas. In this thesis, I define a formula for color classification and apply other related features such as the shape of the traffic signs to implement the detection component that offers high recall rate. In traffic sign recognition, the most important thing is to get the effective features. I use discrete cosine transform and singular value decomposition to collect the invariant features of traffic signs that will not be severely interfered by disturbing environments. These invariant features can be used as the input to artificial neural networks or naïve Bayes models to achieve the recognition task. This system yields satisfactory performance about 76% recognition rate when I test them with very challenging data.
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    Description: 碩士
    國立政治大學
    資訊科學學系
    90753013
    92
    Source URI: http://thesis.lib.nccu.edu.tw/record/#G0090753013
    Data Type: thesis
    Appears in Collections:[Department of Computer Science ] Theses

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