Digital techniques 16 Image processing 16 Congresses 12 Computer vision 6 Optical pattern recognition 5 Geometry 3 Pattern recognition systems 3 Parallel processing (Electronic computers) 2 Signal processing 2 Civil engineering 1 Coding theory 1 Computer graphics 1 Computer networks 1 Computer-aided engineering 1 Congresses, 1 Cryptography 1 Data processing 1 Digital filters (Mathematics) 1 Document imaging systems 1 Information theory 1 Mobile communication systems 1 Object-oriented methods (Computer science) 1 Speech processing systems 1 Underwater acoustics 1