特征提取与清晰表达是三维流场可视化研究中的两个主要问题。
Feature extraction and clarity expression are two main problems in 3d flow visualization research.
在步态识别中，完整的人体轮廓是特征提取、特征表达、目标分类与目标识别等后期处理的前提条件。
In gait recognition, effective extraction of human contour is a prerequisite of subsequent processing including feature extraction, feature expression, target classification and target recognition.
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