The detection and extraction of feature points are the basis technology in image registration.

二维特征点的检测和提取是进行图像配准的关键技术。

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So, the detection and extraction of signals reflected by the target are difficulties and the key technology of passive tracking location.

因此，目标反射信号的检测和提取是个难点，也是无源探测定位的关键技术之一。

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As a novel biometric authentication technology, human ear recognition needs to solve the problems of image processing such as edge detection and feature extraction.

人耳识别作为新的生物特征识别技术，首先要解决作为基础的边缘检测和特征提取等图像处理方面的问题。

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