Recently, we have developed a database of online handwritten isolated Bangla characters. These samples have been collected using WACOM Intuous 2 tablet. The maximum sampling rate is 200 points per second. No restriction was imposed on the writers except for specifying rectangular regions for writing each character sample. Each person was asked to write samples at two to five different points of time. This is to capture the variation in one's handwriting style that may occur from one point of time to another. Each sample is stored as a text file consisting of the (x, y) coordinates and pressure among a few other information of the pen tip along its trajectory. Here, we considered only the coordinates of the positions of pen tip having non-zero pressure. The pen up and pen down situations are identified in terms of zero and non-zero pressures. A few samples from this database are shown in the following Figure.
Ref:- U. Bhattacharya, B. K. Gupta and S. K. Parui, Direction Code Based Features for Recognition of Online Handwritten Characters of Bangla, accepted for publication in the Proceedings of 9th ICDAR to be held in Brazil during 23-26 September, 2007.