The 20th ICPR (International Conference on Pattern Recognition) Conference took place in Istanbul, Turkey, during August 23–26, 2010. For the first time in the ICPR history, several scientific contests (http://www.icpr2010.org/ contests.php) were organized in parallel to the conference main tracks. The purpose of these contests was to provide a setting where participants would have the opportunity to evaluate their algorithms using publicly available datasets and standard performance assessment methodologies, disseminate their results, and discuss technical topics in an atmosphere that fosters active exchange of ideas. Members from all segments of the pattern recognition community were invited to submit contest proposals for review.

This book constitutes the refereed contest reports of the 20th International Conference on Pattern Recognition, ICPR 2010, held in Istanbul, Turkey, in August 2010. The 31 revised full papers presented were carefully reviewed and selected. The papers are organized in topical sections on BiHTR - Bi-modal handwritten Text Recognition, CAMCOM 2010 - Verification of Video Source Camera Competition, CDC - Classifier Domains of Competence, GEPR - Graph Embedding for Pattern Recognition, ImageCLEF@ICPR - Information Fusion Task, ImageCLEF@ICPR - Visual Concept Detection Task, ImageCLEF@ICPR - Robot Vision Task, MOBIO - Mobile Biometry Face and Speaker Verification Evaluation, PR in HIMA - Pattern Recognition in Histopathological Images, SDHA 2010 - Semantic Description of Human Activities.