Whiteboard and phone camera works quite well for recording what was doodled in a problem solving meeting.
Your vertical roller version with digitiser suggests the use of a continuous loop of dry marker roller (this used to exist as canvas painted with a heavy paint that could take dry marker pens. The paint used to crack after some years though) so after being scanned, the marks are erased...
Your vertical roller version with digitiser suggests the use of a continuous loop of dry marker roller (this used to exist as canvas painted with a heavy paint that could take dry marker pens. The paint used to crack after some years though) so after being scanned, the marks are erased...