ORB算法：基于FAST和BRIEF的特征提取

The ORB (Oriented FAST and Rotated BRIEF) algorithm is a feature extraction algorithm based on the FAST feature detector and BRIEF feature descriptor. It is a fast and efficient algorithm for extracting features from images. The FAST detector is used to find corner points in the image, and the BRIEF descriptor is used to describe the features. The ORB algorithm is often used in applications such as object recognition, image matching, and visual tracking.