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Handwriting perceptual classification and synthesis using discriminate HMMs and progressive iterative approximation

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Abstract

This paper handles the problem of online handwriting synthesis. Indeed, this work presents a probabilistic model using the embedded hidden Markov models (HMMs) for the classification and modeling of perceptual sequences. At first, we start with a vector of perceptual points as input seeking a class of basic shape probability as output. In fact, these perceptual points are necessary for the drawing and the recovering of each basic shape where each one is designed with an HMM built and trained with its components. Each path through these possibilities of control points represents an observation that serves as input for the following step. Secondly, the already detected sequences of observations which represent a segment formed an initial HMM and the concatenation of multiple ones leads to a global HMM. To classify a global HMM, we should codify it by searching the best path of initial HMM. The best path is obtained by computing the maximum of likelihood of the different basic shapes. In order to synthesize the handwritten trace, and to recover the best control points sequences, we investigated the progressive iterative approximation. The performance of the proposed model was assessed using samples of scripts extracted from IRONOFF and MAYASTROON databases. In fact, these samples served for the generation of the set of control points used for the HMMs training models. In experiments, good quantitative agreement and approximation were found for the generated trajectories and a more reduced representation of the scripts models was designed.

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Acknowledgements

The authors would like to acknowledge the financial support of this work by grants from General Direction of Scientific Research (DGRST), Tunisia, under the ARUB 01/UR/11/02 program.

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  1. REGIM-Lab: Research Group on Intelligent Machines Laboratory, National School of Engineers, University of Sfax, BP 1173, 3038, Sfax, Tunisia

    Hala Bezine & Adel M. Alimi

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  1. Hala Bezine
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Correspondence to Hala Bezine.

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Bezine, H., Alimi, A.M. Handwriting perceptual classification and synthesis using discriminate HMMs and progressive iterative approximation. Neural Comput & Applic 32, 16549–16570 (2020). https://doi.org/10.1007/s00521-019-04206-9

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