In this chapter, we are going to learn how to detect salient points, also known as keypoints, in an image. We will discuss why these keypoints are important and how we can use them to understand the image content. We will talk about different techniques that can be used to detect these keypoints, and understand how we can extract features from a given image.
By the end of this chapter, you will know:
What are keypoints and why do we care about them
How to detect keypoints
How to use keypoints for image content analysis
The different techniques to detect keypoints
How to build a feature extractor