1. A method comprising: obtaining an image for presentation to a user of a digital magazine; identifying one or more feature points in the image, each feature point identifying a point of interest associated with an object in the image; partitioning the image into a plurality of equally-sized regions; determining a number of feature points in each region of the image; determining one or more groups of adjacent regions based at least in part on the number of feature points in each region, each group including a plurality of regions adjacent to each other, by identifying a region in the image; identifying regions adjacent to the identified region including at least a threshold number of feature points; and generating a group of regions including the identified region and the regions adjacent to the identified region including at least the threshold number of feature points; and identifying regions of the image including feature points that are not adjacent to at least one other region including feature points; storing information identifying the one or more groups of regions in association with the image.