Skip to main content

Linear Regression-Based Skew Correction of Handwritten Words in Indian Languages

  • Conference paper
  • First Online:
Proceedings of 2nd International Conference on Computer Vision & Image Processing

Part of the book series: Advances in Intelligent Systems and Computing ((AISC,volume 704))

Abstract

Skew corrected text lines in multi-oriented handwritten documents often contain words that are not properly aligned. Most segmentation algorithms fail to correctly segment skewed words into constituent characters. So, skew correction of words in a text line is as important as skew correction of a text line in a document. In the present work, we propose a method that uses linear curve fitting for estimating and correcting skew present in handwritten words. This method efficiently detects and corrects skew in four Indian languages, namely Bangla, Hindi, Marathi and Panjabi. The proposed method is able to handle skewed word images to an extent of \(\pm {50^{\circ }}\) and provides accurate result even when the \(m\bar{a}tr\bar{a}\) is discontinuous. We have compared our method with existing ones to show the efficacy of the proposed method.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 129.00
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 169.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

References

  1. Shi, Z., Govindraju, V.: Skew Detection for Complex Document Images Using Fuzzy Runlength. In: Proceedings of the International Conference on Document Analysis and Recognition, pp. 715–719, (2003)

    Google Scholar 

  2. Srihari, S.N., Govindraju, V.: Analysis of textual image using the Hough transform. Machine Vision Applications, vol. 2, pp. 141–153, (1989)

    Google Scholar 

  3. Chin, A.H.W., Jennings, A.: Skew detection in handwritten scripts. In: Speech and Image Technologies for computation and Telecommunications, pp. 319–322, (1997)

    Google Scholar 

  4. Postl, W.: Detection of linear oblique structures and skew scan in digitized documents. In: Proceedings of the International Conference on Pattern Recognition, pp. 687–689, (1986)

    Google Scholar 

  5. Sarfraz, M., Zidouri, A., Shahab, S.A.: A novel approach for skew estimation of document images in OCR system. In: Proceedings of the International Conference on Computer Graphics, Imaging and Vision: New Trends, pp. 175–180, (2005)

    Google Scholar 

  6. Bagdanov, A., Kanai J.: Projection profile based Skew Estimation Algorithm for JBIG Compressed Images. In: Proceedings of the International Conference on Document Analysis and Recognition, pp. 401–405, (1997)

    Google Scholar 

  7. Bag, S., Bhowmick, P., Harit, G., Biswas, A.: Character segmentation of handwritten Bangla text by vertex characterization of isothetic covers. In: Proceedings of the National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics, pp. 21–24, (2011)

    Google Scholar 

  8. Bag, S., Krishna, A.: Character Segmentation of Hindi Unconstrained Handwritten Words. In: Proceedings of the International Workshop on Combinatorial Image Analysis, pp. 247–260, (2015)

    Google Scholar 

  9. Bhowmik, T.K., Roy, A., Roy, U.: Character segmentation for handwritten Bangla words using artificial neural network. In: Proceedings of the IAPR TC3 NNLDAR, (2005)

    Google Scholar 

  10. Roy, A., Bhowmik, T.K., Parui, S.K., Roy, U.: A novel approach to skew detection and character segmentation for handwritten Bangla words. In: Digital Image Computing: Techniques and Applications, pp. 30–30, (2005)

    Google Scholar 

  11. Malakar, S., Seraogi, B., Sarkar, R., Das, N., Basu, S., Nasipuri, M.: Two-stage skew correction of handwritten Bangla document images. In: Proceedings of the International Conference on Emerging Applications of Information Technology, pp. 303–306, (2012)

    Google Scholar 

  12. Otsu, N.: A threshold selection method from Gray level histogram. IEEE Transaction on System, Man, Cybernetics, vol. 19, pp. 62–66, (1978)

    Google Scholar 

  13. Rosenfeld, A., Kak, A.: Digital picture processing, \(2^{nd}\) Edition, vol. 1 and 2, Academic press, New York, (1982)

    Google Scholar 

  14. Bhattacharya, U., Shridhar, M., Parui, S.K., Sen, P.K., Chaudhuri, B.B.: Offline recognition of handwritten Bangla characters: an efficient two-stage approach. Pattern Analysis and Applications, vol. 15, no. 4, pp. 445–458, (2012)

    Google Scholar 

  15. Basu, S., Chaudhury, C., Kundu, M., Nasipuri, M., Basu, D.K.: Text line extraction from multi skewed handwritten documents. Pattern Recognition, vol. 40, no. 6, pp. 1825–1839, (2007)

    Google Scholar 

  16. Das, N., Halder, C., Obaidullah, S.M., Roy, K., Santosh, K.C.: PHDIndic_11: page-level handwritten document image dataset of 11 official Indic scripts for script identification. Multimedia Tools and Applications, pp. 1–36, (2017)

    Google Scholar 

Download references

Acknowledgements

The authors wish to thank Deepika Gupta, Junior Research Fellow, Department of Computer Science and Engineering, IIT(ISM), Dhanbad, for collecting, organizing and providing the Marathi data set used in this work.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Rahul Pramanik .

Editor information

Editors and Affiliations

Rights and permissions

Reprints and permissions

Copyright information

© 2018 Springer Nature Singapore Pte Ltd.

About this paper

Check for updates. Verify currency and authenticity via CrossMark

Cite this paper

Pramanik, R., Bag, S. (2018). Linear Regression-Based Skew Correction of Handwritten Words in Indian Languages. In: Chaudhuri, B., Kankanhalli, M., Raman, B. (eds) Proceedings of 2nd International Conference on Computer Vision & Image Processing . Advances in Intelligent Systems and Computing, vol 704. Springer, Singapore. https://doi.org/10.1007/978-981-10-7898-9_11

Download citation

  • DOI: https://doi.org/10.1007/978-981-10-7898-9_11

  • Published:

  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-10-7897-2

  • Online ISBN: 978-981-10-7898-9

  • eBook Packages: EngineeringEngineering (R0)

Publish with us

Policies and ethics