Auto-focused Webcam Photos with GPIO trigger?

Hello world. I'm a new user of Linux/Debian thanks to my RPi, and need a little help from the pros here...

I'm currently working on an image capture solution based on the Raspberry Pi. The idea is that I'll be able to take photos using my Logitech c525 webcam using a button connected to GPIO. I also have a TFT display which I'm trying to use as a viewfinder.

So far I've experimented with various webcam packages in the repository, but have only had luck with guvcview. The others like fswebcam, uvccapture used by tutorials on the web don't seem to have autofocus or "live-view" features.

Guvcview works great in GUI mode, but the problem I've had in using guvcview with GPIO is that I can't seem to find a Command Line prompt to trigger an image capture. Maybe I'm getting syntax wrong or smth...

Hope someone could point me in the right direction, either with guvcview in CLI, or suggest alternative approaches / webcam software. Many thanks in advance!

Linux Newb

gregoryfenton over 12 years ago

http://manpages.ubuntu.com/manpages/lucid/man1/guvcview.1.html
At a (completely blind) guess I would use:
guvcview --image=image.jpg --npics=1 --verbose

Edit: what command line are you using?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
sunmorgus over 12 years ago

You might want to take a look at WebCamSpy: http://webcamspy.sourceforge.net/ (though it doesn't specifically support Linux, you might have some luck).

According to here and here, you could possibly use mplayer or vlc.

There's a video tutorial here as well for using uvccapture.

Hope these help
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
Former Member over 12 years ago in reply to gregoryfenton

@Greg: Man, I tried that but it doesn't quite work. So far the only time I've successfully managed to capture images from LXterminal is through commands like "guvcview -c 5 -m 15" which takes 15 images 5 seconds apart.

Even so, when I use this it takes time for the GUI to be launched, and only 1 image is actually captured. =\

On a side note (Noobqn): After launching programs like guvcview in LXTerminal, how do i send new CLI commands when the program is already running? Continue typing wherever the cursor is and hit return?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel