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What are the applications of feature detectors?

There are several novel feature detectors such as ORB, FAST, SURF detectors. However, I don't know what their applications are.

I noticed that they can be used for corner detection, image matching. But how they can involve in another applications. I know ada-boost makes use of these descriptors' property. But I don't know how to make use of these detectors.

I'd like to know if there are some reference materials for me to know more how to take these detectors into applications.