What are the main functions of OpenCV?

The main functions of OpenCV are image processing and computer vision. It provides a wide range of functions and tools for reading, displaying, transforming, filtering, feature extraction, object detection, object tracking, and other operations on images. OpenCV also includes many machine learning algorithms, such as classification, clustering, regression, which can be used for image analysis and pattern recognition. Additionally, OpenCV supports camera and video processing, including capturing, processing, and saving real-time video streams.