I got the app to use a picture saved on the phone as the photo to be scanned. I have used it to successfully scan both linear barcodes and QR matrix barcodes, including one QR code that was in a picture of a billboard. I think it would be a good idea to use QR codes in the library because they can be encoded with sentences or descriptions. For example this one says "Archives and Special Collections (3rd Floor)."
I created it with this QR Code Generator. I also found a map of the library on the LITS website that I can probably use.
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