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The NATO Advanced Research Workshop on Issues in Acoustic Signal/Image Processing and Recognition was held August 5-9, 1982 at the Cappuccini complex in San Miniato Italy. The Workshop was primarily concerned with the underwater acoustic signal processing and seismic signal analysis and a major effort was made to link these topics with pattern recognition, i~ge processing and artificial intelligence. Major issues and new approaches in these interrelated areas were closely examined in the Workshop. In addition to paper presentations three discussion sessions were held on! (1) spectral analysis in underwater acoustics, (2) seismic wave propaga tion, seismic imaging and migration, and seismic inversion, and (3) unresolved issues and future directions. This Proceedings volume includes most presentations made at the Workshop. The publication, like the meeting itself, is unique in the sense that it provides exten sive interactions among the closely related areas stated above. Such interactions which usually result in the integration of different systems or approaches are certainly much needed to achieve some performance breakthrough while individual systems or approaches reach their performance limit. I am grateful to all participants for their active participation that makes the Workshop very productive, and to Dr. Lewis J. Lloyd and Dr. Ralph Goodman for their help to arrange an informative visit to the SACLANT ASW Research Centre for the Workshop participants. I am confident that this publication will be equally produc tive to report important current research results and near-future research activity particularly in underwater acoustic signal processing.
List of contents
Overview.- 1. A Common Framework for Acoustic Signal Analysis in the Ocean Environment.- Pattern Recognition Processing.- 2. Application of Signal Processing and Pattern Recognition to Underwater Acoustics.- 3. Acoustical Classification of the Sea Floor.- Artificial Intelligence Approach.- 4. Machine Analysis of Acoustical Signals.- Issues in Array Processing and Target Motion Analysis.- 5. Problems of Spatial Signal Processing in Shallow Water.- 6. Geometric Aspects in Array Processing.- 7. Adaptive Range Tracking of Underwater Maneuvering Targets Using Passive Measurements.- 8. Bearing Estimation Using Random Arrays.- 9. How VHF Acoustics Can Help Process Underwater Acoustic Signals.- Underwater Channel Characterization.- 10. Characterization of the Underwater Channel Application to Communication.- Issues in Seismic Signal Processing.- 11. Multidimensional Filtering of Acoustic Records in Seismic Signal Processing.- 12. Sampling Theory and Wave Propagation.- Image Processing.- 13. Implementation of Image Enhancement and Least Squares Filtering Techniques for Acoustic Data.- 14. Digital Processing of Time Varying Images.- 15. The Template Edge Detector and Its Performance.- 16. On a Spatial Clustering Algorithm for Image Analysis.- 17. Digital Image Processing by Means of Generalized Scale-Invariant Filters.- Report of Discussion Session on Unresolved Issues and Future Directions.- List of Participants.
