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OpenCV 3.x with Python By Example - Second Edition

You're reading from  OpenCV 3.x with Python By Example - Second Edition

Product type Book
Published in Jan 2018
Publisher Packt
ISBN-13 9781788396905
Pages 268 pages
Edition 2nd Edition
Languages
Authors (2):
Gabriel Garrido Calvo Gabriel Garrido Calvo
Profile icon Gabriel Garrido Calvo
Prateek Joshi Prateek Joshi
Profile icon Prateek Joshi
View More author details
Toc

Table of Contents (17) Chapters close

Title Page
Copyright and Credits
Contributors
Packt Upsell
Preface
1. Applying Geometric Transformations to Images 2. Detecting Edges and Applying Image Filters 3. Cartoonizing an Image 4. Detecting and Tracking Different Body Parts 5. Extracting Features from an Image 6. Seam Carving 7. Detecting Shapes and Segmenting an Image 8. Object Tracking 9. Object Recognition 10. Augmented Reality 11. Machine Learning by an Artificial Neural Network 1. Other Books You May Enjoy

What is supervised and unsupervised learning?


If you are familiar with the basics of machine learning, you will certainly know what supervised and unsupervised learning is all about.

To give a quick refresher, supervised learning refers to building a function based on labeled samples. For example, if we are building a system to separate dress images from footwear images, we first need to build a database and label it. We need to tell our algorithm what images correspond to dresses and what images correspond to footwear. Based on this data, the algorithm will learn how to identify dresses and footwear so that when an unknown image comes in, it can recognize what's inside that image.

Unsupervised learning is the opposite of what we just discussed. There is no labeled data available here. Let's say we have a bunch of images, and we just want to separate them into three groups. We don't know what the criteria will be. So, an unsupervised learning algorithm will try to separate the given set of...

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