OpenCV is the most widely distributed computer vision library. It includes hundreds of ready-made image processing functions and is used both in academic institutions and in industry. This book demonstrates the basic image processing algorithms implemented in OpenCV using examples. First, the installation of the library is described, its general structure is described, and simple examples of reading and writing images and videos are given. Next, image filtering and color manipulation are discussed. Learn about processing techniques such as retouching, noise removal, and HDR imaging. The last chapter will focus on improving performance through the use of GPUs. After reading the book, you can create interesting and effective applications for image processing. All topics discussed are illustrated by examples.