Android: Why can't I initialize BackgroundSubtractor with Video.createBackgroundSubtractorMOG2()?

BackgroundSub

asked 2019-03-27 08:51:10 -0600

I implemented my class with CameraBridgeViewBase.CvCameraViewListener2. And here is my onCameraFrame() method that does the processing after frame grabbing before rendering the frame on screen:

   @Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
    Mat frame=(Mat)inputFrame;
    Mat fgMask=new Mat();
    BackgroundSubtractor bs=Video.createBackgroundSubtractorMOG2();
    bs.apply(frame,fgMask);
    //return 4 channel as rgba or 1 channel as gray scale
    return inputFrame.rgba();
}

I learn the syntax from here.

The problem is that Android Studio says 'Cannot resolve method createBackgroundSubtractorMOG2()' after I imported the Video class.

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Comments

code runs fine on desktop java, so the problem unfortunately is between you and your ide (and there's not much we can do from here) ;(

apart from that,you have another problem: it does not make any sense, to create a new bgsubtractor per frame (onCameraFrame is the wrong place to create one).

berak ( 2019-03-28 00:46:06 -0600 )edit

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public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) { mRgba = inputFrame.rgba(); Imgproc.cvtColor(mRgba, mRgb, Imgproc.COLOR_RGBA2RGB); //the apply function will throw the above error if you don't feed it an RGB image sub.apply(mRgb, mFGMask, -1); //apply() exports a gray image by definition Imgproc.cvtColor(mFGMask, mRgba, Imgproc.COLOR_GRAY2RGBA); return mRgba; }

Android: Why can't I initialize BackgroundSubtractor with Video.createBackgroundSubtractorMOG2()?

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Android: Why can't I initialize BackgroundSubtractor with Video.createBackgroundSubtractorMOG2()? edit

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Android: Why can't I initialize BackgroundSubtractor with Video.createBackgroundSubtractorMOG2()?