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You use BackgroundSubtractorMOG2 (OpenCV). It can detect shadow. Then you use threshold to remove shadow.

// Init background substractor

Ptr<backgroundsubtractor> bg_model = createBackgroundSubtractorMOG2().dynamicCast<backgroundsubtractor>();

bg_model->apply(img, mask);

threshold(mask, mask, 200, 255, THRESH_BINARY);

You use Apply BackgroundSubtractorMOG2 (OpenCV). to solve it. It can detect shadow. Then you use threshold to remove shadow.

// Init background substractor

Ptr<backgroundsubtractor> bg_model = createBackgroundSubtractorMOG2().dynamicCast<backgroundsubtractor>();

bg_model->apply(img, mask);

threshold(mask, mask, 200, 255, THRESH_BINARY);