Assume that you are using the FAST algoritm for corner/feature detection. You pick an image and run the FAST algorithm.
Question:
All these green dots are actully coordinates in x and y direction. What type of rotational invariance information can I get from only knowing the coordinates that are created by the geometical shapes inside the image?
For example: If we measure the angles between every point, the angles are going to be the same, no matter how we rotates the image.
NOTE
This is a feature detection algorithm, sometimes one or more coordinates can flicker e.g some green dots disapear and appears few milliseconds after.