Re: Getting a hook from shell mode to do motion detection?

El Viernes, 29 de diciembre de 2017 17:39:08 Alan Corey escribió:
> I want to set up a wildlife camera, so I've read a few articles about
> it.  I've been practicing with an old Canon PowerShot S70 and it seems
> suitable.  What I'd like to try to do is use the preview images for
> motion detection.  I need to mask out some areas to avoid false
> activations from clouds passing over, that sort of stuff, and probably
> some averaging to account for the sun rising and setting.
> 
> For speed it seems advisable to work in Gphoto2's shell mode but I'm
> trying to figure out a way to provide input from an external program.
> I want to do capture-preview in a loop: get a preview, run my compare
> program, get another preview.  If the compare sees something go into
> another loop grabbing big images for some amount of time, then back to
> previews.
> 
> I did help in shell mode but I don't see anything listed that looks
> like it would work, like being able to detect the presence of some
> file I could use a a semaphore.  There aren't any branch (or loop)
> instructions either.
> 
>   Alan

Hello Alan,

For other needs related to security I'm also interested in doing something 
equivalent. I thought my first try would be 

http://www.chriswpage.com/2009/05/setup-an-advanced-webcam-security-system-with-ubuntu-8-04-and-motion/

using the motion program under Linux. It allows to launch scripts when motion 
is detected, but you need a webcam for motion detection and a camera for good 
quality shots. That's (and the fact I own a Canon 40D) why I'm not sure at all 
about the webcam approach.

I have high programming skills and experience with gphoto so to implement this 
myself will not be a problem. If you can't find a solution for your case just 
send me the exact gphoto commands you use for your camera to enter shell mode, 
take a preview, and take also a big image in auto mode or whatever you use 
(including the file names generated in your computer after executing those 
commands).

Can't promise to do it for a given date but likely it will take few weeks.

Regards,
Tomas.


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