Summary

In this chapter, you learned that a contour is the outline of an object. This outline can either be on the outer border of the shape (an external contour) or it may be on a hole or other hollow surface inside the object (an inner contour). You learned how to detect contours of different objects and how to draw them on images using different colors. Also, you learned how to access different contours based on their area, width, and height.

Toward the end of the chapter, you gained hands-on experience of how to access the contours of a reference shape from an image containing multiple contours. This chapter can serve as a good foundation if you want to create smart systems, such as a license plate recognition system.

Up to Chapter 3, Working with Histograms, you learned about the basics of image processing using OpenCV. This chapter, on the other hand, was designed to give you a gentle push into the vast world of image processing and its practical applications in Computer...