1. A method comprising: identifying, by one or more computers, an image in a first storage system; determining, by the one or more computers, whether a second storage system includes an entry for the image identifying a region of interest in the image; when the second storage system does not include an entry for the image, identifying, by the one or more computers, a region of interest for the image; performing, by the one or more computers, one or more transforms on the identified region of interest in order to identify one or more aspects of the identified region of interest.