Described embodiments include a system, method, and computer program product. A described system includes a feature-detection circuit that extracts a perceivable feature included in each digital image of a plurality of digital images. Each digital image includes a respective portion of a region of interest of a surface. A feature-matching circuit determines a substantial correspondence between (x) a perceivable feature included in a border region segment of a selected digital image and (y) at least one perceivable feature included in each digital image of the plurality of digital images other than the selected digital image. A data collection circuit gathers the determined substantial correspondences for the perceivable feature included in the border region segment of the selected digital image. A reporting circuit outputs informational data indicative of a possible non-imaged portion of the region of interest of the surface.