Directional wavelet approach to remove document image interference

In this paper, we propose a directional wavelet approachto remove images of interfering strokes coming from theback of a historical handwritten document due to seepingof ink during long period of storage. Our previous workrequired mapping of both sides of the document in orderto identify the interfering strokes to be eliminated. Perfectmapping, however, is difficult due to document skews,differing resolutions, non-availability of the reverseside and warped pages during scanning. The newapproach does not require double-sided mapping butinstead uses a directional wavelet transformto distinguish the foreground and reverse side strokes.Experiments have shown that the directional waveletoperation effectively removes the interfering strokes.

[1]  D. Donoho,et al.  Translation-Invariant DeNoising , 1995 .

[2]  S. Mallat.  A wavelet tour of signal processing , 1998 .

[3]  Ki-Sang Hong,et al.  Binarization of noisy gray-scale character images by thin line modeling , 1999, Pattern Recognit..

[4]  I. Daubechies.  Ten Lectures on Wavelets , 1992 .

[5]  Rainer Hoch,et al.  On the evaluation of document analysis components by recall, precision, and accuracy , 1999, Proceedings of the Fifth International Conference on Document Analysis and Recognition. ICDAR '99 (Cat. No.PR00318).

[6]  Moon-Soo Chang,et al.  Improved binarization algorithm for document image by histogram and edge detection , 1995, Proceedings of 3rd International Conference on Document Analysis and Recognition.

[7]  Toyohide Watanabe,et al.  Character extraction from noisy background for an automatic reference system , 1999, Proceedings of the Fifth International Conference on Document Analysis and Recognition. ICDAR '99 (Cat. No.PR00318).

[8]  Hon-Son Don,et al.  A noise attribute thresholding method for document image binarization , 1995, Proceedings of 3rd International Conference on Document Analysis and Recognition.

[9]  Wayne Niblack,et al.  An introduction to digital image processing , 1986 .

[10]  Majid Ahmadi,et al.  A Morphological Approach to Text String Extraction from Regular Periodic Overlapping Text/Background Images , 1994, CVGIP Graph. Model. Image Process..

[11]  Chew Lim Tan,et al.  Restoration of Archival Documents Using a Wavelet Technique , 2002, IEEE Trans. Pattern Anal. Mach. Intell..

[12]  Chew Lim Tan,et al.  Matching of double-sided document images to remove interference , 2001, Proceedings of the 2001 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. CVPR 2001.