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Mastering OpenCV 4 with Python

You're reading from   Mastering OpenCV 4 with Python A practical guide covering topics from image processing, augmented reality to deep learning with OpenCV 4 and Python 3.7

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Product type Paperback
Published in Mar 2019
Publisher Packt
ISBN-13 9781789344912
Length 532 pages
Edition 1st Edition
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Author (1):
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Alberto Fernández Villán Alberto Fernández Villán
Author Profile Icon Alberto Fernández Villán
Alberto Fernández Villán
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Table of Contents (20) Chapters Close

Preface 1. Section 1: Introduction to OpenCV 4 and Python
2. Setting Up OpenCV FREE CHAPTER 3. Image Basics in OpenCV 4. Handling Files and Images 5. Constructing Basic Shapes in OpenCV 6. Section 2: Image Processing in OpenCV
7. Image Processing Techniques 8. Constructing and Building Histograms 9. Thresholding Techniques 10. Contour Detection, Filtering, and Drawing 11. Augmented Reality 12. Section 3: Machine Learning and Deep Learning in OpenCV
13. Machine Learning with OpenCV 14. Face Detection, Tracking, and Recognition 15. Introduction to Deep Learning 16. Section 4: Mobile and Web Computer Vision
17. Mobile and Web Computer Vision with Python and OpenCV 18. Assessments 19. Other Books You May Enjoy

k-means clustering

OpenCV provides the cv2.kmeans() function, which implements a k-means clustering algorithm, which finds centers of clusters and groups input samples around the clusters.

The objective of the k-means clustering algorithm is to partition (or cluster) n samples into K clusters where each sample will belong to the cluster with the nearest mean. The signature of the cv2.kmeans() function is as follows:

retval, bestLabels, centers=cv.kmeans(data, K, bestLabels, criteria, attempts, flags[, centers])

data represents the input data for clustering. It should be of np.float32 data type, and each feature should be placed in a single column. K specifies the number of clusters required at the end. The algorithm-termination criteria are specified with the criteria parameter, which sets the maximum number of iterations and/or the desired accuracy. When these criteria are...

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