Feature Matching

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本文介绍了图像注册领域的关键方法，包括基于区域的方法和基于特征的方法。重点阐述了区域方法中的相关性和交叉相关技术，以及自动生成地面控制点对、图片分割成三角形并进行分片校正的过程。同时，概述了基于特征的方法的基本思路。

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A method is used in image registration.

The detected features in the reference and sensed images can be matched by means of the image intensity values in their close neighborhoods, the feature spatial distribution, or the feature symbolic description, looking for the feature correspondence.

Area-based methods:
correlation-like methods
using cross-correlation
这里写图片描述

H. Hanaizumi, S. Fujimura, An automated method for registration of satellite remote sensing images, Proceedings of the International Geoscience and Remote Sensing Symposium IGARSS’93, Tokyo, Japan, 1993, pp. 1348–1350.

1\estimation of ratio of spatial resolution and relative and shift between images.
2\automatic generation of GCP(ground control point) pairs
3\divide picture into triangles
4\piece-wise rectification between the triangles(affine-transformation)