Align LDR images 如果不是用三脚架来照的不同曝光的照片
The images which need to register each other are always beyond one-modal images. In many cases, it is required to align images taken from different imaging apparatus.
在图像配准中常常需要把来源于不同成像设备的图像进行配准处理，这些不同成像模式的图像称为多模态图像。
Basically, the goal of image registration is to align images of same scene by removal of the potential geometrical distortion existed.
配准问题的目的就是将同一场景的不同图像对齐或匹配，消除存在的几何畸变。
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