以下为句子列表：
英文: A method independent of the orientation information is presented based on gray level similarity of a local area and its sub-samplings, computing the minimum size of the sampling with the grey level similarity, and eventually, the ridge frequency related t
中文: 摘要提出了一种独立于纹线方向信息的方法，根据指纹整体与局部在灰度的相似性，求出具有该相似性的最小局部的尺寸，从而得到相应的纹线密度。
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