As mentioned in the previous chapter, image processing has become an integral part of our society, and whether you notice or not, it is being used everywhere. In the previous chapter, you learned about the basics of image processing and developed a couple of interesting projects using Raspberry Pi. One of the important guiding principles for image processing is: If the eye can do it, so can the machines. Thus, if an object is fairly well hidden in an image, yet the eye can see it and track it, then it should be possible to devise a vision algorithm that can do the same. In this chapter, you will develop an algorithm for the things that can be easily done by human eye. In addition to this, you will learn algorithms for certain tasks that are difficult to do with human eye. In the later part of this chapter, you will develop an interesting surveillance project from what you have learned so far. Here are the key topics that you will learn in this chapter...