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POHow to get moving object's mask using OpenCV BackgroundSubtractorMOG2
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  1. POHow to get moving object's mask using OpenCV BackgroundSubtractorMOG2
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    copied!<p>I want to mask the moving objects from video. I found that OpenCV has some built-in BackgroundSubtractors which could possibly saving my time a lot. However, according to the <a href="http://docs.opencv.org/modules/video/doc/motion_analysis_and_object_tracking.html?highlight=background#BackgroundSubtractorMOG2%20:%20public%20BackgroundSubtractor" rel="nofollow noreferrer">official reference</a>, the function:</p> <pre><code>void BackgroundSubtractorMOG2::operator()(InputArray image, OutputArray fgmask, double learningRate=-1) </code></pre> <p>should output a mask, fgmask, but it doesn't. The fgmask variable will contain the "contour of the mask" instead after invoking above method. That's weird. All I want is a simple closed region filled with white color(for example) to represent the moving objects. How could I do that?</p> <p>Any reply or recommendation would be very appreciate. Thanks a lot.</p> <p>Here's my code:</p> <pre><code>int main(int argc, char *argv[]) { cv::BackgroundSubtractorMOG2 bg = BackgroundSubtractorMOG2(30,16.0,false); cv::VideoCapture cap(0); cv::Mat frame, mask, _frame, _fmask; cvNamedWindow("mask", CV_WINDOW_AUTOSIZE); for(;;) { cap &gt;&gt; frame; bg(frame,fmask,-1); _frame = IplImage(frame); _fmask = IplImage(fmask); cvShowImage("mask", &amp;_fmask); if(cv::waitKey(30) &gt;= 0) break; } return 0; } </code></pre> <p>A snapshot of the output video is: <img src="https://i.stack.imgur.com/hkN67.png" alt="enter image description here"></p> <p>p.s. My working environment is OpenCV2.4.3 on OSX 10.8 and XCode 4.5.2 with apple LLVM compiler 4.1.</p>
 

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