Maciek's profile - activity

I'm doing an Android app with use of Visual studio and Xamarin and I'm using Opencv Android SDK

I'm trying to use absdiff function in order to implement basic motion detection on android. My code looks following:

public Mat OnCameraFrame(CameraBridgeViewBase.ICvCameraViewFrame inputFrame)
 {

        Mat frame = inputFrame.Gray();
        if (firstFrame == null)
        {
            firstFrame = frame;
        }
        else
        {
            Mat temp = new Mat();                
            Core.Absdiff(firstFrame, frame, temp);
            Imgproc.Threshold(temp, temp, 25, 255, Imgproc.ThreshBinary);
            return temp;
        }
        return frame;
    }

But in line where Absdiff function is executed I get an error like:

at cv::Mat::create(int, int const*, int)+103 [0x7e7ed304]
   at cv::_OutputArray::create(int, int const*, int, int, bool, int) const+1064 [0x7e801af1]
   =================================================================
   Got a SIGSEGV while executing native code. This usually indicates
   a fatal error in the mono runtime or one of the native libraries 
   used by your application.
   =================================================================
   Fatal signal 11 (SIGSEGV) at 0x77a482e1 (code=2), thread 8967 (Thread-2162)

I'd be grateful for any kind of help, because I'm totally out of ideas. Sorry for the bad formatting, but I don't get it. Greets, Maciek