Abstract: One embodiment of the present invention provides a system that facilitates computer-assisted tagging of objects in a digital image. During operation, the system receives locations for one or more objects-of-interest in the digital image. Next, the system determines likelihoods of specific tags being assigned to the objects-of-interest. The system then automatically assigns tentative tags to the objects-of-interest based on the determined likelihoods. Next, the system displays the assignments of tentative tags to a user, and receives corrections to the assignments, if any, from the user.

Abstract: One embodiment of the present invention provides a system that can represent an area of a raster image by a centerline. During operation, the system receives a planar map which represents a raster image that contains a region. Note that the region corresponds to a face in the planar map whose edges correspond to the boundaries of the region. Next, the system determines a centerline for a subregion within the region which is currently represented by an outline. The system then transforms the planar map so that the subregion is represented by the centerline.