Hi,
I am pretty new to OpenCV and I am stuck at the moment. Since I will have same background in my project, I thought it would be easier to work, if I could remove my background. But first, I have to ask one thing. Can I use BackgroundSubtractorMOG2 for images? Because it is under video analysis/motion analysis title.
I read the documentation on opencv.org and looked through countless examples/tutorials but I am still having difficulty understanding how MOG2 works.
Quick question: What is *history* that in parameters?
So, I have written a simple code. I get a foreground mask. So, what is next step? How can I remove the background and left with my object only? Shouldn't I load my background first, then the actual image, so that MOG2 could do the background subtraction?
I am using OpenCV 2.4.11.
Thanks in advance.
Code:
#include
#include
#include
using namespace cv;
using namespace std;
//global variables
int history = 1;
float varThreshold = 16;
bool bShadowDetection = true;
Mat src; //source image
Mat fgMaskMOG2; //fg mask generated by MOG2 method
Ptr pMOG2; //MOG2 Background subtractor
int main(int argc, char* argv[])
{
//create GUI windows
namedWindow("Source");
namedWindow("FG Mask MOG 2");
src = imread("bluePaper1.png", 1);
//create Background Subtractor objects
pMOG2 = new BackgroundSubtractorMOG2(history, varThreshold, bShadowDetection); //MOG2 approach
pMOG2->setInt("nmixtures", 3);
pMOG2->setDouble("fTau", 0.5);
pMOG2->operator()(src, fgMaskMOG2);
imshow("Source", src);
imshow("FG Mask MOG 2", fgMaskMOG2);
waitKey(0);
return 0;
}
Source image:
fgMask that I get from MOG2:
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