Abstract
Altering handwritten documents is receiving special attention from researchers because it is useful in several sensitive crime applications such as the identification of suicide notes, fraudulent certificates, fake answer scripts, bank and property documents etc. This paper aims at developing a robust method for detecting altered text in handwritten document images in noisy and blurry environments. This study considers ten classes of handwritten text affected by multiple forgery operations with noise and blur as follows: (i) Normal-original text, (ii) Copy-paste forgery, (iii) Insertion forgery, (iv) Copy-paste and insertion forgery, (v) Noisy text, (vi) Blurred text, (vii) Copy-paste forgery with noise, (viii) Copy-paste forgery with blur, (ix) Insertion forgery with noise and (x) Insertion with blur. For ten-class classification, the proposed work explores the combination of statistical, gradient and texture features with a Bayesian classifier. The proposed approach works based on the premise that altered content in noisy and blurry handwritten documents exhibits inconsistent patterns of pixel arrangements while the original text exhibits a regular pattern of pixel arrangements. Comprehensive experiments on our dataset of 10-class and three standard datasets, namely, a dataset of forged handwritten text, a dataset of altered receipt images, and a dataset of forged IMEI number images are conducted to show effectiveness and robustness of the proposed approach compared to the state-of-the-art methods.
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Data availability
The dataset and code is available at https://github.com/Gayatri-patilbujare/Altered-Handwritten-Text-Detection.
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Acknowledgements
The authors thank Mr. Lokesh, University of Malaya for sharing the code of existing methods and datasets to conduct comparative study experiments in this work.
The author of this work received partial support from Faculty Grant (GPF096A-2020, GPF096B-2020 and GPF096C-2020), University of Malaya, Malaysia.
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Patil, G., Shivakumara, P., Gornale, S.S. et al. A new robust approach for altered handwritten text detection. Multimed Tools Appl 82, 20925–20949 (2023). https://doi.org/10.1007/s11042-022-14242-8
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DOI: https://doi.org/10.1007/s11042-022-14242-8