电子科技大学学报
電子科技大學學報
전자과기대학학보
JOURNAL OF UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA
2015年
1期
72-78
,共7页
Copula模型%伽玛分布%KL距离%散射变换
Copula模型%伽瑪分佈%KL距離%散射變換
Copula모형%가마분포%KL거리%산사변환
Copula model%gamma distribution%kullback-leibler divergence%scattering transform
针对褶皱中文笔迹身份鉴别的问题，提出了一种基于散射变换系数统计特性的识别方法，主要利用散射变换的局部平移不变性和弹性形变稳定性等特性，先将文本图像进行散射变换，再采用伽玛模型，对其各子带的散射系数提取分布特征作为全局特征，然后在全局特征上建立Copula模型，最后使用Copula模型之间的KL距离计算相似性，用于身份鉴别。理论分析和对比实验结果表明，对于不同褶皱的文本图像，基于散射变换统计特性的识别方法优于现有的方法。
針對褶皺中文筆跡身份鑒彆的問題，提齣瞭一種基于散射變換繫數統計特性的識彆方法，主要利用散射變換的跼部平移不變性和彈性形變穩定性等特性，先將文本圖像進行散射變換，再採用伽瑪模型，對其各子帶的散射繫數提取分佈特徵作為全跼特徵，然後在全跼特徵上建立Copula模型，最後使用Copula模型之間的KL距離計算相似性，用于身份鑒彆。理論分析和對比實驗結果錶明，對于不同褶皺的文本圖像，基于散射變換統計特性的識彆方法優于現有的方法。
침대습추중문필적신빈감별적문제，제출료일충기우산사변환계수통계특성적식별방법，주요이용산사변환적국부평이불변성화탄성형변은정성등특성，선장문본도상진행산사변환，재채용가마모형，대기각자대적산사계수제취분포특정작위전국특정，연후재전국특정상건립Copula모형，최후사용Copula모형지간적KL거리계산상사성，용우신빈감별。이론분석화대비실험결과표명，대우불동습추적문본도상，기우산사변환통계특성적식별방법우우현유적방법。
Targeting at the problem of wrinkled Chinese handwriting recognition, this paper presents a method based on statistical characteristics of scattering transform coefficients. This method mainly uses the local translational invariance and the stability of elastic deformation of scattering transform. Firstly, the text image is transformed by scattering. The distribution characteristics used as global characteristics are extracted by applying gamma model to scattering coefficients of sub-bands. Then the copula model is constructed based on these global characteristics. Finally, the similarities are calculated for recognizing writers by using the Kullback-Leibler divergence between copula models. Theoretical analysis and comparative experiment show that our method based on statistical characteristics of scattering transform is more advantageous than the others for when regarding text images with various degrees of wrinkles.
