On the basis of Poincare Index and zero point-detection of gradient field,a hierarchy algorithm for detecting singular point(core and delta) was proposed.
提出了一种分别基于Poincare指数和梯度场零点检测的分级算法来提取奇异点(核心点,三角点)。
A fast point pattern matching algorithm based on core and delta information obtained from fingerprint classification is achieved.