libcam does not automatically detect the camera source. We need to specify the source. just change the /dev/video0 of code 'Camera A("/dev/video0", 160, 120, 30);' to your camera source. let say your camera attached to /dev/video3 than the code should look like this:

Camera A("/dev/video3", 160, 120, 30);

Hope this helps.

--- On Fri, 20/8/10, rogerd <greatersea@gmail.com> wrote:

From: rogerd <greatersea@gmail.com>
Subject: Re: [Gumstix-users] OpenCV Overo Webcam
To: gumstix-users@lists.sourceforge.net
Date: Friday, 20 August, 2010, 5:57 PM


thanks fadh,

I think my problem is within the video source.
does the libcam.c auto detect video sources? ("/dev/video0")
or do i have to specify the video input?
and if so.. im sorry for asking too many question but would you quickly
brief me through how to do?




fadh_japan wrote:
>
> Dear rogerd,
>
> the code A.toIplImage(frame) did just that. It translate the data from
> v4l2 to IplImage. You can actually see the picture by adding cvShowImage.
> Here the full code:
>
> #include <stdio.h>
> #include <stdlib.h>
> #include "cv.h"
> #include "highgui.h"
> #include "libcam.h"
>
> int main()
> {
>     IplImage *frame=cvCreateImage(cvSize(160, 120), 8, 3);
>
>     //initialize camera   
>     Camera A("/dev/video0", 160, 120, 30);    // width=160 , height=120, fps=30
>
>     for (i=0;i<99;i++)
>     {
>         while(A.Get()==0) usleep(10);        // get the image
>         A.toIplImage(frame);            // translate the image to IplImage
>         // from here you can use opencv
>                 
>                 // show the image
>                 cvNamedWindow("Picture", 0);
>         cvMoveWindow("Picture", 300, 100);    
>         cvShowImage("Picture",frame);
>
>                 // need to add this if not you would not able to see the
> window.
>                 // click any key to continue to the next frame
>                 cvWaitKey(0);
>     }
>     return 0;   
> }
>
> The code gets the image from v4l2, translate to IplImage and show the
> image for 99 times. Different image each time.
>
>
> rogerd wrote:
>>
>> Dear fadh_japan,
>>
>> Thanks for your help, but your code didnt seem to output 'frame' of an
>> IplImage data structure.
>> did you display the frames everynow and then? thanks,
>>
>> please help, it would be highly appreciated
>>
>>
>> -Rogerd
>>
>>
>>
>>
>> fadh_japan wrote:
>>>
>>> What I did was using v4l2 directly instead of opencv command to capture
>>> the image. The code I use was from http://code.google.com/p/libv4l2cam/.
>>> Download and uncompress the v4l2stereo-1.047 and take two files from it.
>>> That is libcam.h and libcam.c. Add the header file to the project. How
>>> to use? I did it like this (code has been snipped)
>>>
>>>
>>> #include <stdio.h>
>>> #include <stdlib.h>
>>> #include "cv.h"
>>> #include "highgui.h"
>>> #include "libcam.h"
>>>
>>> int main()
>>> {
>>>     IplImage *frame=cvCreateImage(cvSize(160, 120), 8, 3);
>>>
>>>     //initialize camera   
>>>     Camera A("/dev/video0", 160, 120, 30);    // width=160 , height=120,
>>> fps=30
>>>
>>>     for (i=0;i<99;i++)
>>>     {
>>>         while(A.Get()==0) usleep(10);        // get the image
>>>         A.toIplImage(frame);            // translate the image to IplImage
>>>         // from here you can use opencv
>>>     }
>>>     return 0;   
>>> }
>>>
>>>
>>> about the frame rate. By using cvCaptureFromCAM(0) and by using my
>>> algorithm, I could only get a maximum framerate of 10.8 fps but now I
>>> can get upto 25.0 fps. one down side. (In my TODO list) it seams that
>>> the auto focus is gone. Need to fix this. Hope this help.
>>>
>>>
>>>
>>>
>>
>>
>
>

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