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Efficient document-image super-resolution using convolutional neural network

Pandey, Ram Krishna and Ramakrishnan, A G (2018) Efficient document-image super-resolution using convolutional neural network. In: SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES, 43 (2).

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Official URL: http://dx.doi.org/10.1007/s12046-018-0794-1


Experiments performed by us using optical character recognizers (OCRs) show that the character level accuracy of the OCR reduces significantly with decrease in the spatial resolution of document images. There are real life scenarios, where high-resolution (HR) images are not available, where it is desirable to enhance the resolution of the low-resolution (LR) document image. In this paper, our objective is to construct a HR image, given a single LR binary image. The works reported in the literature mostly deal with super-resolution of natural images, whereas we try to overcome the spatial resolution problem in document images. We have trained and obtained a novel convolutional model based on neural networks, which achieves significant improvement in terms of the peak-signal-to-noise ratio (PSNR) of the reconstructed HR images. Using parametric rectified linear units, mean PSNR improvements of 2.32, 4.38, 6.43 and 8.92 dB have been achieved over those of LR input images of 50, 75, 100 and 150 dots per inch (dpi) resolution and average word level accuracy of almost 43%, 45% and 57% on 75 dpi Tamil, English and Kannada images, respectively.

Item Type: Journal Article
Additional Information: Copy right for the article belong to INDIAN ACAD SCIENCES, C V RAMAN AVENUE, SADASHIVANAGAR, P B #8005, BANGALORE 560 080, INDIA
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 12 Apr 2018 18:48
Last Modified: 12 Apr 2018 18:48
URI: http://eprints.iisc.ac.in/id/eprint/59535

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