What is the current optical piano roll scanning state of the art?
I have done an extensive Internet search for information regarding
optical roll scanning technology.  It appears to me that very little
has been published in several years.

I have hundreds of original Duo-Art and Ampico rolls that I would
like to scan while they are still in excellent condition.  Can anyone
point me to a high quality system?  Because of the potential scale
of this project, I would like to be able to do the scanning myself.

John Kelsey

 [ Four techniques are in use today to read the music roll data for
 [ making roll copies and for generating MIDI signals for storage and
 [ later playback: (a) pneumatic reading, (b) optical reading using
 [ discrete photo-detectors, (c) optical reading using a line scan CCD
 [ camera, and (d) optical reading using a CIS array.  Each technology
 [ has its own advocates and pros & cons.  See the articles in the
 [ recent AMICA Bulletin Vol. 57 No. 2 - March/April 2019.  -- Robbie