Jim, I'm glad to hear that you found my write-up helpful. I really appreciate your kind words and will definitely add the C230 as a MJPEG-ready webcam. Out of my own curiosity, are you 1) doing any additional processing with OpenCV or 2) displaying the video in real-time (either of which could be cause for a slower frame rate)? If you have LXDE, my guess is that #2 is the culprit. At the very least, it sounds like you're happy with the performance for your application and thats what matters! =)
Thanks again! - Mike On Wed, Oct 2, 2013 at 7:44 AM, shedmeister <[email protected]> wrote: > I just wanted to say thanks for this awesome thread. With your procedure > and code, I have VGA capture now working too. I would like to add the > following comments: > > 1) I am using a Logitech C230 camera (looks like an eyeball). So you can > add this to the list of cameras that support MJPG capture mode with full > JPEG output. > 2) I am not getting a full 30 fps, only about 24. But there are > differences between my setup and yours. I am running Ubuntu 12.04 > (Precise) + LXDE, and haven't really optimized much except for building > libjpeg-turbo and rebuilding OpenCV as you suggest. > 3) I built OpenCV from source on the BBB without using distcc or an > external thumb drive. I am booting from a 4GB uSD card. It built in 3-4 > hours. > > Thanks again! > Jim > > > On Tuesday, September 11, 2012 10:32:07 AM UTC-4, p_lin wrote: > >> Hi, >> >> I'm running Ubuntu 11.10 and I'm trying to develop an application using >> opencv and a webcam. I'm running into problems whenever I try for >> resolutions higher than 320x240. I tried using the Ps3Eye (driver is >> gspca_ov534) and the logitech C260 (driver is uvcvideo). At 320x240 it >> seems to work fine and I get a saved image with the occasional "select >> timeout" error. >> >> However, when I try to run at 640x480 I get this output (with a black >> image file): >> >> VIDIOC_QUERYMENU: Invalid argument >> VIDIOC_QUERYMENU: Invalid argument >> VIDIOC_QUERYMENU: Invalid argument >> VIDIOC_QUERYMENU: Invalid argument >> Resolution set, entering loop... >> select timeout >> select timeout >> Saving Image >> >> >> Any ideas on how to fix this error? It would be great to be able to save >> higher resolution images... are there other ways to grab a still from the >> webcam? >> >> >> Enter code here... >> CvCapture* capture = 0; >> >> capture = cvCaptureFromCAM(-1); >> >> >> //set camera resolution to low, perform object detection >> //then set resolution to high, and capture images >> >> cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH, 640 ); >> cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT, 480 ); >> >> if (!capture) >> printf("error opening capture"); >> else >> { >> printf("Resolution set, entering loop... \r\n"); >> IplImage* image = cvQueryFrame( capture ); >> image = cvQueryFrame( capture ); >> >> if( !image ) >> return 0; >> >> printf("Saving Image\n\r"); >> cvSaveImage("cam.jpg", image); //save the image >> //start=time(NULL); //get current time in seconds >> >> } >> >> >> >> >> >> >> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/G5Xs2JuwD_4/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
