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Is it possible for unsupervised learning to learn about high-level, class-specific features given only unlabelled images? For example detecting human or animal faces? If so, how?

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  • $\begingroup$ This question has been flagged as too broad. You might want to edit the title to ask only if it's possible or useful, not how to do it. $\endgroup$ – Ben N Aug 4 '16 at 0:25
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I am assuming each image contains a single object.

It is possible, however, it is not as easy as you might think. Firstly, you need extract as many features as possible: original image, LBP, SIFT, moments, contour descriptors to name a few. Than concatenate these features into a single feature vector. After this step, use clustering. You will need a lot of samples to compensate for the number of features. After clustering, use a correlation method to find which features are related to each cluster.

If you need features to classify within a cluster, you could do a second clustering with full set of features and apply the same method. The features that are selected for a cluster will not be suitable to classify within the cluster.

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