DOI QR코드

DOI QR Code

Distortion Corrected Black and White Document Image Generation Based on Camera

카메라기반의 왜곡이 보정된 흑백 문서 영상 생성

  • 김진호 (경일대학교 전자공학과)
  • Received : 2015.09.16
  • Accepted : 2015.10.20
  • Published : 2015.11.28

Abstract

Geometric distortion and shadow effect due to capturing angle could be included in document copy images that are captured by a camera in stead of a scanner. In this paper, a clean black and white document image generation algorithm by distortion correction and shadow elimination based on a camera, is proposed. In order to correct geometric distortion such as straightening un-straight boundary lines occurred by camera lens radial distortion and eliminating outlying area included by camera direction, second derivative filter based document boundary detection method is developed. Black and white images have been generated by adaptive binarization method by eliminating shadow effect. Experimental results of the black and white document image generation algorithm by recovering geometrical distortion and eliminating shadow effect for the document images captured by smart phone camera, shows very good processing results.

Keywords

Document Distortion;Skew Correction;Adaptive Binarization;Smart Phone Camera

References

  1. G. Kiran and M. S., "Automatic Rectification of Perspective Distortion from a Single Image Using Plane Homography," Int. J. of Computational Sciences & Applications, Vol.3, No.5, pp.47-58, 2013. https://doi.org/10.5121/ijcsa.2013.3506
  2. A. Jain, A. Dubey, R. Gupta, N. Jain, and P. Tripathi, "Fundamental Challenges to Mobile Based OCR," Int. Journal of Innovative Research & Study, Vol.2, Issue.5, pp.86-101, 2013.
  3. J. Wen, S. Li, and J. Sun, "A New Binarization Method for Non-uniform Illuminated Document Images," Pattern Recognition, Vol.46, pp.1670-1690, 2013. https://doi.org/10.1016/j.patcog.2012.11.027
  4. B. Gato, I. Pratikakis, and S. Perantonis, "Adaptive Degraded Document Image Binarization," Pattern Recognition, Vol.39, pp.317-327, 2006. https://doi.org/10.1016/j.patcog.2005.09.010
  5. M. Feng and Y. Tan, "Contrast Adaptive Binarization of Low Quality Document Images," IEICE Electronics Express, Vol.1, No.16, pp.501-506, 2004. https://doi.org/10.1587/elex.1.501
  6. R. C. Gonzalez and R. E. Woods, Digital Image Processing, 3rd Edition, Prentice Hall, Saddle River, 2008.
  7. Getting Started with OpenCL on Android OS, https://software.intel.com/en-us/android/articles/opencl-basic-sample-for-android-os
  8. ABBY OCR, http://ocr.retia.co.kr