An ROI (region of interest) is drawn according to common and shape variables. The common variables are common to ROIs irrespectively of the shape thereof. Expressions defining relations between the common and shape variables are determined and stored for each ROI in advance. When an instruction is issued...http://www.google.com/patents/US5485561?utm_source=gb-gplus-sharePatent US5485561 - Method of and apparatus for replacing region of interest
