Image Feature Extraction in OpenCV: Keypoints and Description Vectors

In the previous post, you learned some basic feature extraction algorithms in OpenCV. The features are extracted in the form of classifying pixels. These indeed abstract the features from images because you do not need to consider the different color channels of each pixel, but to consider a single value. In this post, you will learn some other feature extract algorithms that can tell you about the image more concisely.

After completing this tutorial, you will know:

• What are keypoints in an image
• What are the common algorithms available in OpenCV for extracting keypoints

Kick-start your project with my book Machine Learning in OpenCV. It provides self-study tutorials with working code.

Let’s get started.