It's extra work, but is more contextual. You could, for instance, link to wikipedia articles, imdb articles (for actors) etc. and not just link to ad content.
Really what it does is help define what is inside an image.
Really what it does is help define what is inside an image.
Do you do automatic image segmentation, or are these images "hand-labeled" (I can not imagine that would scale)? If it's automatic - is it calculated server-side or client-side?