1. A Local Visual Operator Which Recognizes Edges and Lines
2. Machine perception of three-dimensional solids, in Optical and Electro-Optical Information Processing;Roberts,1965
3. Relational descriptions in picture processing;Barrow,1970
4. Scene analysis using a semantic base for region growing, AIM-209;Yakimovsky,1973
5. Object enhancement and extraction;Prewitt,1970