Re: [Gumstix-users] Gumstix Caspa with Yocto and OpenCV

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Thanks Adam,

OpenCV uses an integer for choosing the camera to be used instead of the
device nodes.
0 is the first camera detected in the system and it increases according to
the cameras connected to your system.

First the pipes are set as it's shown in the wiki:

#Set the pipes
media-ctl -r -l '"mt9v032 3-005c":0->"OMAP3 ISP CCDC":0[1], "OMAP3 ISP
CCDC":2->"OMAP3 ISP preview":0[1], "OMAP3 ISP preview":1->"OMAP3 ISP
resizer":0[1], "OMAP3 ISP resizer":1->"OMAP3 ISP resizer output":0[1]'
#Set the formats
media-ctl -V '"mt9v032 3-005c":0[SGRBG10 752x480], "OMAP3 ISP
CCDC":2[SGRBG10 752x480], "OMAP3 ISP preview":1[UYVY 752x480], "OMAP3 ISP
resizer":1[UYVY 752x480]'

Then I used the following code to check if it accesses the Caspa camera:

#include "opencv2/opencv.hpp"
/**
 * Get the number of camera available
 */
int main(int, char**)
{
   cv::VideoCapture temp_camera;
   int maxTested = 10;
   for (int i = 0; i < maxTested; i++){
     cv::VideoCapture temp_camera(i);
     bool res = (!temp_camera.isOpened());
     temp_camera.release();
     if (res)
     {
       return i;
     }
   }
   return maxTested;
}

The output is like this:

./test
HIGHGUI ERROR: V4L2: device /dev/video0 is unable to capture video memory.
Unable to stop the stream.: Bad file descriptor
HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
HIGHGUI ERROR: V4L2: device /dev/video3 is unable to capture video memory.
Unable to stop the stream.: Bad file descriptor
HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
HIGHGUI ERROR: V4L2: device /dev/video5 is unable to capture video memory.
Unable to stop the stream.: Bad file descriptor
HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
HIGHGUI ERROR: V4L: index 7 is not correct!

I couldn't make OpenCV work with Caspa Camera using the standard OpenCV
methods.
The code below which is quite simple returns the following error.

#include "opencv2/opencv.hpp"
using namespace cv;
int main(int, char**)
{
    VideoCapture cap(0); // open the default camera
    if(!cap.isOpened())  // check if we succeeded
        return -1;

    for(;;)
    {
        Mat frame;
        cap >> frame; // get a new frame from camera
        // do any processing
        imwrite("image.jpg", frame);
        if(waitKey(30) >= 0) break;   // you can increase delay to 2
seconds here
    }
    // the camera will be deinitialized automatically in VideoCapture
destructor
    return 0;
}

When the camera is set 0 as above the output is like this:

./test
HIGHGUI ERROR: V4L2: device /dev/video0 is unable to capture video memory.
VIDIOC_STREAMON: Bad file descriptor
VIDIOC_STREAMON: Inappropriate ioctl for device
VIDIOC_STREAMON: Inappropriate ioctl for device
VIDIOC_STREAMON: Inappropriate ioctl for device
VIDIOC_STREAMON: Inappropriate ioctl for device
VIDIOC_STREAMON: Inappropriate ioctl for device
.
.
.
.

When it's set to a non-zero value output is like this:

./test
HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
VIDIOC_STREAMON: Invalid argument
VIDIOC_QBUF: Invalid argument
VIDIOC_QBUF: Invalid argument
VIDIOC_QBUF: Invalid argument
VIDIOC_QBUF: Invalid argument
VIDIOC_QBUF: Invalid argument
VIDIOC_QBUF: Invalid argument
VIDIOC_QBUF: Invalid argument
.
.
.
.

Do you have any idea how to make it work with OpenCV?
I'll really appreciate it.
Thanks,

Tarik

___________________________________

Aydın Tarık Zengin, Ph.D.

On Thu, Aug 28, 2014 at 2:54 AM, adam <ad...@gu...> wrote:

> I never tried OpenCV with Caspa, but are you sure you got the right video
> device? Perhaps /dev/video6 works better [1]?
>
> [1]
> https://github.com/gumstix/Gumstix-YoctoProject-Repo/wiki/Gstreamer-and-Caspa
>
>
> On Fri, Aug 22, 2014 at 3:58 PM, Aydin Tarik Zengin [via Gumstix] <[hidden
> email] <http://user/SendEmail.jtp?type=node&node=4969440&i=0>> wrote:
>
>> Hi,
>>
>> Gumstix Caspa camera (mt9v032) works well with the stock Gumstix yocto
>> image using the mediactl commands.
>>
>> However, when I want to get an image with OpenCV, it seems the /dev/video
>> device won't be accepted.
>> Yocto uses 3.5.7 kernel by default right now.
>> Do I need to do some fine tuning to make the Caspa camera work with
>> OpenCV?
>>
>> Tarik
>> ___________________________________
>>
>> Aydın Tarık Zengin, Ph.D.
>>
>>
>> ------------------------------------------------------------------------------
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