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Practical Data Analysis

You're reading from  Practical Data Analysis

Product type Book
Published in Oct 2013
Publisher Packt
ISBN-13 9781783280995
Pages 360 pages
Edition 1st Edition
Languages
Author (1):
Hector Cuesta Hector Cuesta
Profile icon Hector Cuesta
Toc

Table of Contents (24) Chapters close

Practical Data Analysis
Credits
Foreword
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started 2. Working with Data 3. Data Visualization 4. Text Classification 5. Similarity-based Image Retrieval 6. Simulation of Stock Prices 7. Predicting Gold Prices 8. Working with Support Vector Machines 9. Modeling Infectious Disease with Cellular Automata 10. Working with Social Graphs 11. Sentiment Analysis of Twitter Data 12. Data Processing and Aggregation with MongoDB 13. Working with MapReduce 14. Online Data Analysis with IPython and Wakari Setting Up the Infrastructure Index

Analyzing the results


This example presents a basic implementation that can be adapted in several cases such as 3D object recognition, face recognition, or image clustering. The goal of this chapter is to present how we can easily compare time series without any previous training, in order to find the similarity between images. In this section we present seven cases and will analyze the results.

In the following figure, we can see the first three searches and can observe a good accuracy in the result, even in case of the bus the result displays the result elements in different angles, rotation, and colors:

In the following figure, we see the fourth, fifth, and sixth search, and we can observe that the algorithm performs well with an image that has a good contrast in colors.

In case of the seventh search the result is poor, and in similar cases when the references time series is a landscape or a building, the result are images that are not related to the search criteria. This is because the...

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