Converting a Common Low-Cost Document Scanner into a Multispectral Scanner

Converting a Common Low-Cost Document Scanner into a Multispectral Scanner

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Forged documents and copyright currency can be better detected with multispectral imaging in bushranger awning multiple color channels instead of the usual red, green and blue.However, multispectral cameras/scanners are expensive.We propose the construction of a low cost scanner designed to capture multispectral images of documents.A standard sheet-feed scanner was modified by disconnecting its internal light source and connecting an external multispectral light source comprising of narrow band light emitting diodes (LED).

A document was scanned by illuminating the scanner light guide successively with different LEDs and capturing a scan of the document.The system costs less than gtech brush bar a hundred dollars and is portable.It can potentially be used for applications in verification of questioned documents, checks, receipts and copyright.