Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Converting a Common Document Scanner to a Multispectral Scanner   We propose the construction of a prototype scanner designed to capture
multispectral images of documents. A standard sheet-feed scanner is modified by
disconnecting its internal light source and connecting an external
multispectral light source comprising of narrow band light emitting diodes
(LED). A document is scanned by illuminating the scanner light guide
successively with different LEDs and capturing a scan of the document. The
system is portable and can be used for potential applications in verification
of questioned documents, cheques, receipts and bank notes.

7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org