CORES'05 is the 4th International Conference on Computer Recognition Systems organized by Chair of Computer Systems and Networks of Wroclaw University of Technology each two years. The conference is endorsed by the International Association for Pattern Recognition. The CORES'05 Conference aims to bring together researches and to provide an international forum for the sharing, exchange, presentation and discussion of original research results in both methodological issues and different application areas of pattern recognition. The conference covers all topics in pattern recognition including: 1. Classification and interpretation of text, video, voice 2. Statistical, soft and structural methods of pattern recognition 3. Image processing, analysis and interpretation 4. Features extraction and selection 5. Machine learning 6. Trends and relations recognition and analysis 7. Data and Web mining 8. Machine-oriented knowledge representation and inference methods 9. Knowledge-based decision support systems 10. Advanced signal processing methods 11. Special hardware architecture 12. Applications.