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Venkata Srinu, M.
- Clustering of Hand Written Digits Using K-Means Algorithm and Self Organizing Maps
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Authors
Affiliations
1 Koneru Lakshmaiah Education Foundation, Vijayawada, Guntur(Dt.), Andhra Pradesh, IN
1 Koneru Lakshmaiah Education Foundation, Vijayawada, Guntur(Dt.), Andhra Pradesh, IN
Source
International Journal of Research in Signal Processing, Computing & Communication System Design, Vol 4, No 2 (2018), Pagination: 28-32Abstract
Present work focuses on clustering of MNIST dataset using K-means clustering and Self-Organizing Maps (SOM). Histograms of Oriented Gradients (HOG) descriptors are used to extract the feature vectors and Principal Component Analysis (PCA) is applied on feature vectors to reduce the dimensionality. First two principal components are taken for cluster formation. Purity of cluster metric is used to evaluate the clusters. External criteria with prior information of true class is chosen to validate cluster. The performance of SOM is better than K-means in forming clusters. Out of 10 clusters K-means algorithm missed clusters of 3 digits (0, 7 and 9) whereas SOM missed clusters of 2 digits (5, 9).Keywords
Clustering, Histograms of Oriented Gradients (HOG), K-Means Clustering, MNIST, Principal Component Analysis, Self Organizing Maps, Unsupervised Learning.
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