22 December 1999 Reference line extraction for automated data-entry system using wavelet transform
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It is common that most document forms opt for the use of straight line as a reference position for filled information. The automated data-entry systems of such documents require an ability to search these reference lines so that the location of information in the forms can be known. This paper proposes a wavelet-based algorithm for extracting these reference lines in business forms. Stationary wavelet transform is used to transform a gray-level document image into different frequency-band images. The horizontal detail subband is then selected and passed through a post-processing to produce a binary bitmap of reference lines. The experimental results on synthetic and real document images will be given to illustrate the usefulness of such an algorithm.
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Sakreya Chitwong, Sakreya Chitwong, Seksan Phonsri, Seksan Phonsri, Punya Thitimajshima, Punya Thitimajshima, } "Reference line extraction for automated data-entry system using wavelet transform", Proc. SPIE 3967, Document Recognition and Retrieval VII, (22 December 1999); doi: 10.1117/12.373483; https://doi.org/10.1117/12.373483

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