Robust Handwritten Text Recognition in Scarce Labeling Scenarios: Disentanglement, Adaptation and Generation

diciembre 21, 2020 at 3:00 pm by

Place: CVC Sala d’Actes | Streaming

Thesis Director:

Dr. Alicia Fornés (Centre de Visió per Computador, Universitat Autònoma de Barcelona)

Thesis Co-director:

Dr. Marçal Rossinyol (AllRead MLT)

Dr. Mauricio Villegas (omni:us – Quidenus Group GmbH)

Thesis Committee:

Dr. Gernot A. Fink (Department of Computer Science, TU Dortmund)

Dr. Oriol Ramos (Centre de Visió per Computador, Universitat Autònoma de Barcelona)

Dr. Verónica Romero (Computer Sciece Dep., University of Valencia)

Abstract:

Handwritten documents are not only preserved in historical archives but also widely used in administrative documents such as cheques and claims. With the rise of the deep learning era, many state-of-the-art approaches have achieved good performance on specific datasets for Handwritten Text Recognition (HTR). However, it is still challenging to solve real use cases because of the varied handwriting styles across different writers and the limited labeled data. Thus, both exploring a more robust handwriting recognition architectures and proposing methods to diminish the gap between the source and target data in an unsupervised way are demanded.

In this thesis, firstly, we explore novel architectures for HTR, from Sequence-to-Sequence (Seq2Seq) method with attention mechanism to non-recurrent Transformer-based method. Secondly, we focus on diminishing the performance gap between source and target data in an unsupervised way. Finally, we propose a group of generative methods for handwritten text images, which could be utilized to increase the training set to obtain a more robust recognizer. In addition, by simply modifying the generative method and joining it with a recognizer, we end up with an effective disentanglement method to distill textual content from handwriting styles so as to achieve a generalized recognition performance.

We outperform state-of-the-art HTR performances in the experimental results among different scientific and industrial datasets, which prove the effectiveness of the proposed methods. To the best of our knowledge, the non-recurrent recognizer and the disentanglement method are the first contributions in the handwriting recognition field. Furthermore, we have outlined the potential research lines, which would be interesting to explore in the future.