Hmmm... Maybe "output_all" with "text_changes" will work (and I set the image quality to very low ot save disk space).

But - does Motion compare subsequent pictures, or does it compare all images to the first image?

Thanks!

Jeff

On Mon, Feb 11, 2013 at 10:16 PM, W. Jeffrey Wilson <wjwilson@albion.edu> wrote:
Is it possible to have Motion output information on a regular basis (say, every 0.25 sec or every 1 sec) about the number of pixels that have changed since the last time?  I want to use Motion in a laboratory setting, monitoring movement of an earthworm.  I could use images containing this change info every X sec, or simply the change number without an image.  Note that I want this regularly, even if there is no movement.

Thanks for any guidance, and apologies if this is common knowledge - I could not find an answer.

Jeff

--
W. Jeffrey Wilson
Professor, Psychology Department
Director, Neuroscience Program
Albion College
wjwilson@albion.edu
campus.albion.edu/wjwilson





--
W. Jeffrey Wilson
Professor, Psychology Department
Director, Neuroscience Program
Albion College
wjwilson@albion.edu
campus.albion.edu/wjwilson