Recently, a lot of paper-based documents used in hospitals have been computerized because of diffusion of Hospital Information Systems (HIS). However, some of previously scanned documents do not have enough resolution for document image processing, e.g. OCR Engine, due to storage limitation of the system. Currently, such documents are still archived in HIS, but not used effectively now. These should be converted to electrical data for resemble case search. This paper discusses document image processing methods to search low-resolution medical documents. As the first step of this study, we propose the tagging method for low-resolution document images archived in HIS. This paper shows the detail of the proposed method and experimental results to discusses the effectiveness of the proposed method. We also show problems and future works of this study in the end of paper.

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