In this chapter, we have learnt how to get started with using OpenCV in your Android project. Then we looked at different filters in image processing, especially linear filters, and how they can be implemented on an Android device. These filters will later form the basis of any computer vision application that you try to build. In the following chapters, we will look at more complex image filters, and also see how to extract information from the images in the form of edges, corners, and the like.