Detect keypoints in images without corners

1. What is used to detect corner points in an image?
2. How are feature points detected?
3. What is a Keypoint detector?

What is used to detect corner points in an image?

Moravec corner detection algorithm

The algorithm tests each pixel in the image to see if a corner is present, by considering how similar a patch centered on the pixel is to nearby, largely overlapping patches.

How are feature points detected?

These feature points are detected by algorithms for feature point detection and description such as SIFT [2], SURF [3], BRISK [4], DAISY [5], GIST [6], ORB [7], etc. The detected feature points in images are matched in order to compute the amount of similarity.

What is a Keypoint detector?

Keypoint detection involves simultaneously detecting people and localizing their keypoints. Keypoints are the same thing as interest points. They are spatial locations, or points in the image that define what is interesting or what stand out in the image.