Data extraction in form documents with gray-level background using morphological processing
Rapeeporn Chamchong, Yuttapong Rangsanseri, Punya Thitimajshima · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1999
Automatic reading of form documents with gray-level background needs a preliminary task of preparing a clean image of the data to be recognized using OCR. In this paper, we present a data extraction process for such documents. First, the preprinted background is removed by decomposing the histogram of the input image. Reference lines are then subtracted from this image. Finally, the lost parts of character images overlaying with reference lines can be restored. The experiments carried out with a bank cheque will be given to illustrate the usefulness of such an algorithm.