A facility for determining the 3-dimensional location and orientation of a
subject surface in a distinguished perspective image of the subject
surface is described. The subject surface has innate visual features, a
subset of which are selected. The facility uses the location of the
selected visual features in a perspective image of the subject surface
that precedes the distinguished perspective image in time to identify
search zones in the distinguished perspective image. The facility
searches the identified search zones for the selected visual features to
determine the 2-dimensional locations at which the selected visual
features occur. Based on the determined 2-dimensional locations, the
facility determines the 3-dimensional location and orientation of the
subject surface in the distinguished perspective image.