Offline Printed Urdu Nastaleeq Script Recognition with Bidirectional LSTM Networks

Adnan Ul-Hasan, Saad Bin Ahmed, Faisal Rashid, Faisal Shafait, Thomas M. Breuel
2013 2013 12th International Conference on Document Analysis and Recognition  
Recurrent neural networks (RNN) have been successfully applied for recognition of cursive handwritten documents, both in English and Arabic scripts. Ability of RNNs to model context in sequence data like speech and text makes them a suitable candidate to develop OCR systems for printed Nabataean scripts (including Nastaleeq for which no OCR system is available to date). In this work, we have presented the results of applying RNN to printed Urdu text in Nastaleeq script. Bidirectional Long Short
more » ... Term Memory (BLSTM) architecture with Connectionist Temporal Classification (CTC) output layer was employed to recognize printed Urdu text. We evaluated BLSTM networks for two cases: one ignoring the character's shape variations and the second is considering them. The recognition error rate at character level for first case is 5.15% and for the second is 13.6%. These results were obtained on synthetically generated UPTI dataset containing artificially degraded images to reflect some real-world scanning artefacts along with clean images. Comparison with shape-matching based method is also presented.
doi:10.1109/icdar.2013.212 dblp:conf/icdar/Ul-HasanARSB13 fatcat:dxbu2g2udrb5vnsodibzma5sky