Journal Publications http://www.iam.unibe.ch/fki daily 1 2007-10-25T12:34:55Z A writer identification system for on-line whiteboard data http://www.iam.unibe.ch/fki/publications/bibentries/articlereference.2008-07-07.0375755059 No publisher fkistaff 2008-07-07T13:22:20Z Article Reference A writer identification and verification system using HMM based recognizers http://www.iam.unibe.ch/fki/publications/bibentries/schlapbach07writer In this paper, an off-line, text independent system for writer identification and verification of handwritten text lines using Hidden Markov Model (HMM) based recognizers is presented. For each writer, an individual recognizer is built and trained on text lines of that writer. This results in a number of recognizers, each of which is an expert on the handwriting of exactly one writer. In the identification and verification phase, a text line of unknown origin is presented to each of these recognizers and each one returns a transcription that includes the log-likelihood score for the generated output. These scores are sorted and the resulting ranking is used for both identification and verification. Several confidence measures are defined on this ranking. The proposed writer identification and verification system is evaluated using different experimental setups. No publisher schlpbch 2007-12-05T15:18:39Z Article Reference Automatic learning of cost functions for graph edit distance http://www.iam.unibe.ch/fki/publications/bibentries/neuhaus07cost No publisher schlpbch 2007-12-05T14:20:29Z Article Reference Handwriting recognition of whiteboard notes – studying the influence of training set size and type http://www.iam.unibe.ch/fki/publications/bibentries/liwicki07size This paper presents a system for the recognition of on-line whiteboard notes. Notes written on a whiteboard is a new modality in handwriting recognition research that has received relatively little attention in the past. For the recognition we use an offline HMM-recognizer, which is supplemented with methods for processing the on-line data and generating off-line images. The system consists of six main modules: on-line preprocessing, transformation of on-line to off-line data, off-line preprocessing, feature extraction, classification and post-processing. The recognition rate of our basic recognizer in a writer independent experiment is 59.5%. By applying state-of-the-art methods, such as optimizing the number of states and Gaussian components, and by including a language model we could achieve a statistically significant increase of the recognition rate to 64.3%. To further improve the system performance we increased the size of the training set. For that we investigated two different strategies. First we used another existing database of off-line handwritten text. Second we used a recently collected whiteboard database, called the IAM-OnDB. By means of these strategies the recognition rate could be further increased up to 68.5%. No publisher schlpbch 2007-12-05T14:20:25Z Article Reference Decision trees for filtering large databases of graphs http://www.iam.unibe.ch/fki/publications/bibentries/irniger07decisionTree No publisher schlpbch 2007-12-05T14:20:19Z Article Reference Offline grammar-based recognition of handwritten sentences http://www.iam.unibe.ch/fki/publications/bibentries/zimmermann06offline No publisher schlpbch 2007-12-05T14:20:38Z Article Reference Comparing representative selection strategies for dissimilarity representations http://www.iam.unibe.ch/fki/publications/bibentries/reynolds06comparing No publisher schlpbch 2007-12-05T14:20:32Z Article Reference Edit distance based kernel functions for structural pattern classification http://www.iam.unibe.ch/fki/publications/bibentries/neuhaus06edit No publisher schlpbch 2007-12-05T14:20:27Z Article Reference Distance measures for image segmentation evaluation http://www.iam.unibe.ch/fki/publications/bibentries/jiang06distance No publisher schlpbch 2007-12-05T14:20:20Z Article Reference Fuzzy timed Petri net – analysis and implementation http://www.iam.unibe.ch/fki/publications/bibentries/ding06fuzzy No publisher schlpbch 2007-12-05T14:20:08Z Article Reference Recovery of missing information in graph sequences by means of reference pattern matching and decision tree learning http://www.iam.unibe.ch/fki/publications/bibentries/bunke06recovery No publisher schlpbch 2007-12-05T14:20:06Z Article Reference Rejection strategies for offline handwritten text line recognition http://www.iam.unibe.ch/fki/publications/bibentries/bertolami06rejection No publisher schlpbch 2007-12-05T14:20:03Z Article Reference Self-organizing maps for learning the edit costs in graph matching http://www.iam.unibe.ch/fki/publications/bibentries/neuhaus05selforganizing No publisher schlpbch 2007-12-05T14:20:27Z Article Reference Fuzzy timed Petri net – definitions, properties and applications http://www.iam.unibe.ch/fki/publications/bibentries/ding05fuzzy No publisher schlpbch 2007-12-05T14:20:08Z Article Reference Off-line cursive handwriting recognition using multiple classifier systems–on the influence of vocabulary, ensemble, and training set size http://www.iam.unibe.ch/fki/publications/bibentries/GuBu05-001 No publisher schlpbch 2007-12-05T14:18:48Z Article Reference