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研究生:曾榮鴻
論文名稱:類神經網路應用於數字識別之分析與比較
論文名稱(外文):Analysis and Comparison of Digit Recognition Using Neural Network Approaches
指導教授:莊季高
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:航運技術研究所
學門:運輸服務學門
學類:運輸管理學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:116
中文關鍵詞:類神經網路數字識別
相關次數:
  • 被引用被引用:7
  • 點閱點閱:694
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
圖形識別已被研究多年,而發展圖形識別的主要目的就是使機器賦有近似人類辨識圖像的能力。然而,由於近幾年的資訊發達,所需處理的文件量亦大為增加,若用人工處理,既費時又費力。因此,有許多學者利用人工智慧的方法來做圖形辨識的應用,以期降低人工處理的成本,其中又以類神經網路被採用的最多。但是對於類神經網路應用於圖形識別的領域中,大多著眼於網路結構或學習方式的改良,並無針對傳統類神經網路應用在圖形辨識的比較與分析。
類神經網路依架構分類,最常見的兩大類分別為前饋式網路及迴遞式網路。本文於這兩大類中,各取三種可用於圖形辨識的類神經網路,分別是倒傳遞網路(BPN)、機率神經網路(PNN)、半徑式函數網路(RBFN)和Hopfield網路、適應共振理論(ART1)網路及雙向聯想記憶(BAM)網路等六種,並以數字為例,將已摻有雜訊或是模糊的數字,用以上六種不同的類神經網路來加以辨識比較,並分析各個網路之雜訊容忍度及其記憶容量。且藉由它們對雜訊的容忍度、記憶容量,以及演算法的不同和各個網路的特性,來加以比較和分析。希望藉由本研究,提供一個與一般論文對類神經網路應用在文字的〝辨識率〞方面,另一種不同的思考方向。
Pattern recognition has been developed for years. The major purpose is to bestow the ability of pattern recognition upon a machine. However, because of the information explosion in recent years, the number of documents that need to be managed has grown rapidly. Because handling documents by hand requires a lot of time and labor, many researchers have applied different artificial intelligence pattern recognition methods to reduce the use of manpower. Among these methods, the neural network is the most widely adopted. However, all of the researches that used the neural network in the field of pattern recognition have involved network structure or learning method improvements. There is no comparison and analysis based on traditional neural network applications to pattern recognition. Neural networks, classified by network structure, could be roughly divided in two categories: feedforward network and recurrent network. This research puts focus on three kinds of neural networks that can be applied to pattern recognition. They are the Backpropagation Network, Probabilistic Neural Network, Radial Basis Function Network, Hopfield Network, Adaptive Resonance Theory Network, and Bidirectional Associative Memory Network. In the digit recognition examples, hazy numerals or cluttered numerals are recognized and compared by these neural networks. The tolerance limit to the clutter and the memory capacity with respect to different neural networks are analyzed. Through the tolerance limit, memory capacity, mathematical calculations, and characteristics of each network, the analysis and the comparison are presented. This study provides another approach for comparison with other researches that focus only on the identification success rate in text recognition.
摘要(中文) Ⅰ
摘要(英文) Ⅱ
致謝 Ⅲ
目錄 Ⅳ
圖目錄 Ⅶ
第一章 緒論 1
1.1 類神經網路的歷史 1
1.2 類神經網路的應用 3
1.3 研究動機 4
1.4 研究目的 4
1.5 論文大綱 5
第二章 類神經網路與文字辨識概述 6
2.1 何謂類神經網路 6
2.2 類神經網路之基本架構 7
2.3 類神經網路之分類 9
2.4 類神經網路的特性 11
2.5 文字辨識概說 12
2.6 相關文獻回顧 13
第三章 前饋式類神經網路數字辨識 21
3.1 倒傳遞類神經網路 21
3.1.1 倒傳遞網路演算法 21
3.1.2 倒傳遞演算法的推導 24
3.1.3 倒傳遞網路的重要參數 28
3.1.4 倒傳遞神經網路的評價 30
3.1.5 模擬結果與討論 31
3.2 機率神經網路 41
3.2.1 機率神經網路演算法 44
3.2.2 機率神經網路的優缺點 45
3.2.3 模擬結果與討論 46
3.3 半徑式函數網路 49
3.3.1 網路架構 50
3.3.2 網路演算法 50
3.3.3 模擬結果與討論 52
第四章 遞迴式類神經網路數字辨識 61
4.1 霍普菲爾網路 61
4.1.1 由能量觀點來看網路的運作過程 61
4.1.2 Hopfield網路演算法之證明 62
4.1.3 Hopfield網路容量問題 65
4.1.4 Hopfield網路之優缺點 65
4.1.5 模擬結果與討論 66
4.2 適應共振理論網路 81
4.2.1 ART1 演算法 82
4.2.2 網路架構 84
4.2.3 ART1的設計原理 85
4.2.4 模擬結果與討論 86
4.3 雙向聯想記憶 92
4.3.1 BAM網路的記憶和回想 92
4.3.2 雙向聯想記憶網路的特性 95
4.3.3 模擬結果與討論 95
第五章 結論與展望 109
參考文獻 111
附件一 115
附件二 116
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