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基于中心化Jaccard匹配的SD卡光學(xué)字符驗證
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江南大學(xué) 機械工程學(xué)院

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國家自然科學(xué)基金(62072416);國家自然科學(xué)基金(61873246)。


SD Card Optical Character Verification Based on Centralized Jaccard Matching
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    摘要:

    為了解決安全數碼卡(SD卡,secure digital card)表面字符人工驗證效率差、準確率低的問(wèn)題,提出了一種基于中心化Jaccard匹配的SD卡光學(xué)字符驗證方法,能夠實(shí)現SD卡表面字符的精密檢測與自動(dòng)驗證。首先,提出了一種基于HSV三通道直方圖分析的快速驗證方法,實(shí)現特征顯著(zhù)SD卡圖像的準確驗證;其次,針對SD卡字符驗證精度受光照變化和微小旋轉影響的問(wèn)題,提取V通道圖像和變化角度特征,提高HOG特征對光照和旋轉變化的抵抗能力;最后,針對相似SD卡字符的驗證問(wèn)題,提出了一種中心化廣義Jaccard系數,增強了相似度指標的辨別力,實(shí)現了特征相似圖像的精密檢測。以實(shí)際場(chǎng)景采集的數據對所提方法進(jìn)行驗證分析,試驗結果表明,該算法準確率達到99.15%,具有很好的實(shí)用性和魯棒性。

    Abstract:

    In order to solve the problem of poor efficiency and low accuracy of manual verification of surface characters on SD card(secure digital card), an optical character verification method based on centralized Jaccard matching was proposed, which can realize the precise detection and automatic verification of surface characters on SD card. Firstly, a rapid verification method based on HSV three-channel histogram was proposed, which can accurately detect SD card images with obvious apparent features. Secondly, aiming at the problem that the character verification accuracy of SD card was affected by illumination changes and micro rotations, the resistance of HOG features to illumination and rotation changes was optimized by extracting V-channel images and changing angle features, and the detection accuracy was improved. Finally, aiming at the verification problem of similar characters on SD card, a centralized generalized Jaccard coefficient was proposed, which enhances the discrimination of similarity index and realizes the precise detection of similar images. The proposed method is verified and analyzed based on the data collected in the actual scenario, and the test results show that the accuracy of the detection algorithm reaches 99.15%, which has good practicability and robustness.

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李天賀,吳靜靜,安偉.基于中心化Jaccard匹配的SD卡光學(xué)字符驗證計算機測量與控制[J].,2023,31(7):290-297.

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  • 收稿日期:2023-02-10
  • 最后修改日期:2023-02-26
  • 錄用日期:2023-02-27
  • 在線(xiàn)發(fā)布日期: 2023-07-12
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