A computer system for producing computer generated displays, including window-format displays permitting visualization of changes to a building or structure in an actual environment. The system provides a background display of digital images originating from either an image capture device or from other...http://www.google.co.uk/patents/US5986670?utm_source=gb-gplus-sharePatent US5986670 - Method and apparatus for producing a computer generated display that permits visualization of changes to the interior or exterior of a building structure shown in its actual environment
