Book Image

OpenCV 3.x with Python By Example - Second Edition

By : Gabriel Garrido Calvo, Prateek Joshi
Book Image

OpenCV 3.x with Python By Example - Second Edition

By: Gabriel Garrido Calvo, Prateek Joshi

Overview of this book

Computer vision is found everywhere in modern technology. OpenCV for Python enables us to run computer vision algorithms in real time. With the advent of powerful machines, we have more processing power to work with. Using this technology, we can seamlessly integrate our computer vision applications into the cloud. Focusing on OpenCV 3.x and Python 3.6, this book will walk you through all the building blocks needed to build amazing computer vision applications with ease. We start off by manipulating images using simple filtering and geometric transformations. We then discuss affine and projective transformations and see how we can use them to apply cool advanced manipulations to your photos like resizing them while keeping the content intact or smoothly removing undesired elements. We will then cover techniques of object tracking, body part recognition, and object recognition using advanced techniques of machine learning such as artificial neural network. 3D reconstruction and augmented reality techniques are also included. The book covers popular OpenCV libraries with the help of examples. This book is a practical tutorial that covers various examples at different levels, teaching you about the different functions of OpenCV and their actual implementation. By the end of this book, you will have acquired the skills to use OpenCV and Python to develop real-world computer vision applications.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Packt Upsell

How does it work?

We have been talking about image resizing and how we should consider the image's content when we resize it. So why on earth is it called seam carving? It should just be called content-aware image resizing, right? Well, there are many different terms that are used to describe this process, such as image re-targeting, liquid scaling, seam carving, and so on. It's called seam carving because of the way we resize the image. The algorithm was proposed by Shai Avidan and Ariel Shamir. You can refer to the original paper at

We know that the goal is to resize the given image and keep the interesting content intact. So, we do that by finding the paths of least importance in the image. These paths are called seams. Once we find these seams, we remove or stretch them from the image to obtain a re-scaled image. This process of removing or stretching, or carving, will eventually result in a resized image. This is the reason we call it seam carving...