| Since 1978 | Theoretical and practical research in digital image processing, pattern recognition, remote sensing, art history, archeology, industry, analysis of medical imagery, digital elevation models, expert vision systems, and image pyramids. |
| 1973 -1978 | Management of a large software package for road planning. |
| Key words | Regular, irregular, and dual graph pyramids; |
| information fusion in digital image analysis; | |
| hierarchical shape representation, eccentricity transform; | |
| dual graph contraction, graph pyramids, combinatorial pyramids; | |
| cognitive vision and visual abstraction. |