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How to remove detected shadows from foreground image using Background Subtraction MOG2

asked 2013-03-19 11:27:22 -0500

Agen gravatar image

Im using in built function shadow detection fro Background subtraction MOG2, i want to remove the shadow detected from the foreground image so i can do i blob dectection....any help will be most apreciated thanks in advance

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answered 2017-03-21 18:29:24 -0500

mhaghighat gravatar image

Try this:

cv::Ptr<cv::BackgroundSubtractorMOG2> pMOG2 = cv::createBackgroundSubtractorMOG2();
cv::Mat fgMask;  // Foreground mask

// Update the background model and get the foreground mask
pMOG2->apply(frame, fgMask);

// Blur the foreground mask to reduce the effect of noise and false positives
cv::blur(fgMask, fgMask, cv::Size(15, 15), cv::Point(-1, -1));

// Remove the shadow parts and the noise
cv::threshold(fgMask, fgMask, 128, 255, cv::THRESH_BINARY);
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Although your answer is correct, reviving topics from 2013 seems rather useless in a so fastly changing communtity ...

StevenPuttemans gravatar imageStevenPuttemans ( 2017-03-22 05:46:22 -0500 )edit
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answered 2013-03-24 05:36:40 -0500

Agen gravatar image

sry still noob in openCV actually its simple the function shadow detection(MOG2) assign the shadow detected to value 127, so to remove the shadow just threshold the foreground image with value 127 as minimum. hopes any1 who has this problem........

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Asked: 2013-03-19 11:27:22 -0500

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Last updated: Mar 21 '17