Learn about keypoints, detectors, and descriptors in OpenCV through this 30-minute tutorial. Explore algorithms like SIFT, SURF, and ORB for automatic point detection in images. Discover how to use these techniques for image comparison, alignment, and registration. Follow along with practical examples in Spider IDE, covering Harris corners, Tomasi corners, and various key point detectors. Gain hands-on experience in drawing key points and understanding descriptors. Access the accompanying code on GitHub to enhance your image processing skills.