Hello,
I want to create a motion detector in a OpenCV Android app.
First I accumulate the background with this class:
private Mat mRgba;
private Mat mGray;
private Mat mBackground;
private Mat mDifference;
public Mat accumulateImageBG(Mat img, int type){
if (accuImg==null){//code snipit from berak's answer
accuImg = Mat.zeros(img.size(), type);
}
if (mDifference==null){//code snipit from berak's answer
mDifference = Mat.zeros(img.size(), CvType.CV_8UC1);
}
img.convertTo(img, type);
Imgproc.accumulateWeighted(img, accuImg, 0.1);
Core.convertScaleAbs(accuImg, img);
return img;
}
And then I want to calculate the difference between the background and the camera frame. I tried this code:
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();//in:CV_8UC4 out:CV_32FC4
mGray = inputFrame.gray();//in:CV_8UC1 out:CV_32F
//be sure to specify conversion type with matching # of channels as input image!
mBackground = accumulateImageBG(mGray, CvType.CV_32F);
// Subtract the work image frame from the scaled image average
Core.absdiff(mBackground, mGray, mDifference);
return mDifference;
}
But it's always returning a blank frame. I think there is a problem with my absdiff code. Does anybody know if I did something wrong? I already tested with 3.1.0, 3.0.0 and 2.4.11 versions.
Any tip will be very helpful,
Thanks
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