IDOL Image Server can search for certain types of features in an image, providing ways to classify the images.
For documents, it can extract the following information:
text
Note: If there is no text in your document, Image server might return nonsense, so you must filter the results.
barcodes
logos (you must supply logo images)
signature (user-supplied signature images are needed)
For general photos, it can extract the following information:
faces (including face characteristics)
text
logos
clothing (this feature requires the location of the wearer's face)
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