Experimenting with a hacked portable scanner as a linear multitouch input device. Turns out there's too much buffering in the scanner, which causes latency that makes it difficult to use. But the resolution is really high, if you ever need 60 fps 10,000 pixels wide, try this out!
Huge thanks to Jack McGill for the scanners. He has some more available: sites.google.com/site/roadwarriorscanner/sheetfed-scanner/scanners-for-sale