The Image Analytics service provides the means to get the tags and categories associated with an image on a web page. The Image Analytics is based on the Imagga Image Tagging API and is integrated with the text analytics services of the Self-Service Semantic Suite (S4), so that when a web page is processed, both the text content and the images on the page will be analysed and tags and categories will be recommended.
see also https://www.programmableweb.com/api/ontotext-s4-text-analytics
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