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題 名 | Off-Line Handwritten Chinese Signature Verification System=手寫中文簽字確認系統 |
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作 者 | 鄭明聯; | 書刊名 | 嶺東學報 |
卷 期 | 9 1998.02[民87.02] |
頁 次 | 頁273-288 |
分類號 | 312.76 |
關鍵詞 | 手寫中文簽字確認; 方向特徵; 距離門檻值; Handwritten Chinese signature verification; Directional characteristic; K nearest neighbors; |
語 文 | 英文(English) |
中文摘要 | 本論文提出一離線手寫中文簽字確認系統,使用以方向特徵為辨識基礎的統計式 文字辨識為核心技術。在訓練階段,對每個使用者訓練出各別的平均方向特徵向量,並對每 一位使用者計算出一個距離門檻值。此簽字辨識系統判別使用者簽字真偽的規則為,當一個 輸入特徵向量與其指定的使用者平均特徵向量足夠相近 (即是特徵距離值小於該使用者的距 離門檻值 ),且考慮該被指定使用者與其 k 個最近鄰居的特徵向量, 滿足輸入字形特徵向 量與被指定使用者的平均特徵向量距離為最小,此時該書寫者方被認為該指定使用者的身分 。系統的性能由第一類錯誤 (即是一個合法使用者,依其書寫習慣簽字,被系統誤認為非法 入侵者機率 ) 與第二類錯誤 (非法使用者冒用另一使用者的名義通過系統認證的機率 ) 來 評估。實驗證明,只要使用的字挑選得宜,僅使用含兩個手寫字的簽字即可以達到無第二類 錯誤 (有完全的安全防護性 ),又可以有非常低的第一類錯誤率 (即是有非常好的使用者友 善性 ) 的效果。 |
英文摘要 | This paper is to construct an off-line handwritten Chinese signature verification system with properties of safety and user friendliness, where its verification is based on directional characteristics. In the training process, each user is trained to calculate his average directional characteristic and distance threshold value. The two rules for distinguishing a true signature from a fake one are stated as follows. First, an input characteristic vector must be close enough to the specific (designated) user's average characteristic vector; that is, the distance between the input vector and the designated user's average characteristic vector must be less than the designated user's distance threshold value Second, the distance between the input vector and the designated user's average characteristic vector must be less than these distances between the input vector and the average characteristic vectors of the designated user's k nearest neighbors. Therefore, this signer can be identified as the designated user. The efficiency of this verification system can be evaluated as Mistake Ⅰ and Mistake Ⅱ. Mistake Ⅰ stands for a mistaken rate made by this system when the legal user signs with his habitual signature which is mistaken for an illegal one. Mistake Ⅱ means another mistaken rate when an illegal user signs with imitated signature which is mistaken for a legal one. According to our experiment, if the written words with two chinese characters can be selected carefully, then Mistake Ⅱ can be lowered to a small value with safety property, and Mistake I can also be reduced significantly to achieve user friendliness. |
本系統中英文摘要資訊取自各篇刊載內容。