15. A computer-readable physical memory device comprising executable instructions stored on the computer-readable memory device and configured to program a computing device to perform operations including: identifying an image having a plurality of image tags, wherein each image tag is associated with the image as a whole; identifying a plurality of regions of the image; calculating, for each combination of a region of the image with one of the plurality of image tags, a measurement of diverse density in each of a plurality of feature spaces, wherein the plurality of feature spaces represent one or more low level features of the region; selecting a highest magnitude measurement of diverse density calculated for each combination of the region and one of the plurality of image tags as a diverse density measurement for the combination of the region and the one of the plurality of image tags; and associating one of the plurality of image tags with the region based at least in part on the diverse density measurements for the combinations of the region with the plurality of image tags.
15. A computer-readable physical memory device comprising executable instructions stored on the computer-readable memory device and configured to program a computing device to perform operations including: identifying an image having a plurality of image tags, wherein each image tag is associated with the image as a whole; identifying a plurality of regions of the image; calculating, for each combination of a region of the image with one of the plurality of image tags, a measurement of diverse density in each of a plurality of feature spaces, wherein the plurality of feature spaces represent one or more low level features of the region; selecting a highest magnitude measurement of diverse density calculated for each combination of the region and one of the plurality of image tags as a diverse density measurement for the combination of the region and the one of the plurality of image tags; and associating one of the plurality of image tags with the region based at least in part on the diverse density measurements for the combinations of the region with the plurality of image tags. 17. The computer-readable physical memory device of claim 15 , wherein associating one of the plurality of image tags with the region comprises: selecting an image tag that corresponds to the combination of the region and the image tag having the highest magnitude measurement of diverse density; and associating the image tag that is selected with the region.