1. A system comprising: (a) a feature-detection circuit configured to extract at least one respective perceivable feature included in each digital image of a plurality of digital images, the each digital image of the plurality of digital images includes a respective portion of a region of interest of a surface; (b) a feature-matching circuit configured to determine a substantial correspondence between (x) an extracted perceivable feature included in a border region segment of a selected digital image of the plurality of digital images and (y) an extracted at least one respective perceivable feature included in the each digital image of the plurality of digital images other than the selected digital image; (c) a data collection circuit configured to gather the determined substantial correspondences for the extracted perceivable feature included in the border region segment of the selected digital image; and (d) a reporting circuit configured to output informational data indicative of a possible non-imaged portion of the region of interest of the surface, the informational data responsive to an absence of a determined substantial correspondence between the extracted perceivable feature included in the border region segment of the selected digital image and the extracted at least one respective perceivable feature included in the each digital image of the plurality of digital images other than the selected digital image.