1. A computer-implemented method comprising: receiving, at a computing device comprising a processor, a test image; generating, by the processor, a plurality of maps for the test image based on a plurality of object images, each of the plurality of maps generated to provide information about a similarity of an object portion of a respective object image to each of a plurality of portions of the test image; and detecting a test image object within the test image based at least in part on the plurality of maps.