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OpenCV with Python By Example by Prateek Joshi

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Chapter 5. Extracting Features from an Image

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

Why do we care about keypoints?

Image content analysis refers to the process of understanding the content of an image ...

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