The scale - invariant features are efficiently identified by a staged filtering approach.

尺度不变的特征能够通过采用分阶段滤波的方法来有效地确定.

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Of classical geometric invariants and the gray - scale invariant, invariance analysis of its degradation.

对经典的几何不变量和灰度不变量, 分析其退化不变性.

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