1. A method, comprising: determining a reference region of a source image; determining an extended region of interest of the source image, the extended region of interest having a target aspect ratio and containing the reference region; determining a set of candidate image regions including regions of increasing size from the extended region of interest, the set of candidate image regions comprising a plurality of candidate image regions, each candidate image region of the plurality of candidate image regions having the target aspect ratio and containing the reference region; scaling candidate image regions to form a set of candidate target images, the set of candidate target regions comprising a plurality of candidate target regions; determining quality metric values of images of the set of candidate target images; comparing the determined quality metric values of the images of the set of candidate target images; and selecting one of the candidate target images of the set of candidate target images as a target image based on the comparing.