GETSNAPSHOT timeout error after adjusting camera settings

Hello,

I am using a Webcam (Logitech C160) to capture Images using the Image acquisition toolbox (V 3.5) in Matlab 7.10.0.499. When ever I adjust the camera settings (brightness, exposure etc.) and try to capture an image afterwards I get a timeout error.

??? Error using ==> imaqdevice.getsnapshot at 65 A timeout occurred during GETSNAPSHOT.

Interestingly, when I run the preview window during the setting change I can see the camera changing brightness, exposure etc... and it works fine, however if I stop the preview, then start it after changing the settings the preview window stays black.

If I leave the preview window running during the change, the GETSNAPSHOT function seems to work fine. As soon as I stop the preview I get the error message again.

Running the snapshot function before the change without the preview works fine.

Any ideas would be appreciated!

Sam

Answer 1

[Chirag Gupta]

Can you try and set the trigger to Manual and then try and acquire the snapshot.

 triggerconfig(vidobj, 'manual');
% change properties

 start(vidobj)

snapshot = getsnapshot(vidobj);

 % Call the STOP function to stop the device.
stop(vidobj)

You could also change the Timeout property of the videoinput object.

[Sam]

Thank you for your reply!

Changing the trigger does not make a difference. It still will not work.

How do you change the timeout property of the videoinput object?

[Chirag Gupta]

I belive TimeOut is a property in the videoinput object.

vidObj.Timeout = 15;