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Research on the recovery technology of scanned image of obsolete document

A new technique of scanned image restoration is proposed to save a large amount of important old documents. Firstly, by using a high definition scanner, these obsolete documents are scanned page by page to get the HD images. Secondly, different processing techniques are adopted, including removing black holes, deepening handwriting, denoising, etc., so as to make the contents of the files clearer without changing its original contents. A large number of experiments show that this method is simple and feasible. Not only can this technique protect the original version of these old files, it can also facilitate people to access these documents clearly and efficiently.