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Data Augmentation using Geometric, Frequency, and Beta Modeling approaches for Improving Multi-lingual Online Handwriting Recognition

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The lack of large training data in the context of deep learning applications is a serious issue investigated by many studies that deal with the current challenge. In this paper, we introduce new data augmentation methods that generate more shape and dynamic variations to improve the performance of recognition systems using small datasets. Four data augmentation strategies are employed in our work. The first strategy employs the geometric methods that include: italicity angle, change of magnitude ratio, and baseline inclination angle. The second strategy applies a frequency treatment that attenuates or amplifies the trajectory high harmonics to generate handwriting modified styles. The third strategy employs the beta-elliptic model to extract a combined static and dynamic representation of the handwritten trajectory which undergoes limited random change around its parameters in order to generate more modified samples. The hybrid strategy consists of combining these strategies to maximize variations of the online handwriting trajectory (OHT). We evaluated our approach of data augmentation in the context of multi-lingual online handwriting recognition (OHR) tasks using end-to-end CNN architecture. Four databases; ADAB, ALTEC-OnDB, and Online_KHATT for Arabic script, and UNIPEN for Latin characters, are used to validate the proposed strategy. The obtained results show the effectiveness and the advantage of the adopted strategies compared with those registered before database extension or reported in the state-of-the-art systems.

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The research leading to these results has received funding from the Ministry of Higher Education and Scientific Research of Tunisia under the grant agreement number LR11ES48.

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Correspondence to Yahia Hamdi.

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Hamdi, Y., Boubaker, H. & Alimi, A.M. Data Augmentation using Geometric, Frequency, and Beta Modeling approaches for Improving Multi-lingual Online Handwriting Recognition. IJDAR 24, 283–298 (2021).

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