Book Image

Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

By : Joseph Howse, Joe Minichino
Book Image

Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

By: Joseph Howse, Joe Minichino

Overview of this book

Computer vision is a rapidly evolving science, encompassing diverse applications and techniques. This book will not only help those who are getting started with computer vision but also experts in the domain. You’ll be able to put theory into practice by building apps with OpenCV 4 and Python 3. You’ll start by understanding OpenCV 4 and how to set it up with Python 3 on various platforms. Next, you’ll learn how to perform basic operations such as reading, writing, manipulating, and displaying still images, videos, and camera feeds. From taking you through image processing, video analysis, and depth estimation and segmentation, to helping you gain practice by building a GUI app, this book ensures you’ll have opportunities for hands-on activities. Next, you’ll tackle two popular challenges: face detection and face recognition. You’ll also learn about object classification and machine learning concepts, which will enable you to create and use object detectors and classifiers, and even track objects in movies or video camera feed. Later, you’ll develop your skills in 3D tracking and augmented reality. Finally, you’ll cover ANNs and DNNs, learning how to develop apps for recognizing handwritten digits and classifying a person's gender and age. By the end of this book, you’ll have the skills you need to execute real-world computer vision projects.
Table of Contents (13 chapters)

Understanding ANNs

Let's define ANNs in terms of their basic role and components. Although much of the literature on ANNs emphasizes the idea that they are biologically inspired by the way neurons connect in a brain, we don't need to be biologists or neuroscientists to understand the fundamental concepts of an ANN.

First of all, an ANN is a statistical model. What is a statistical model? A statistical model is a pair of elements, namely the space S (a set of observations) and the probability, P, where P is a distribution that approximates S (in other words, a function that would generate a set of observations that is very similar to S).

Here are two different ways to think of P:

  • P is a simplification of a complex scenario.
  • P is the function that generated S in the first place, or at the very least a set of observations very similar to S.

Thus, ANNs are models that...