Как отключить обнаружение теней в MoG2

Я использую C ++ и Opencv 2.3.1 для вычитания фона. Я много раз пытался изменить параметры Mog2, чтобы отключить функцию обнаружения теней, а также пробовал то, что другие люди предлагают в Интернете. однако, обнаружение тени все еще включено.

подскажите пожалуйста как это отключить?
см. пример кода и сгенерированную маску.

  //opencv
#include < opencv2/opencv.hpp>
#include < opencv2/core/core.hpp>
#include < opencv2/highgui/highgui.hpp>
#include < opencv2/video/background_segm.hpp>
#include < opencv2/imgproc/imgproc.hpp>
#include < opencv2/video/video.hpp>

//C
#include <stdio.h>
//C++
#include <iostream>
#include <sstream>

using namespace cv;
using namespace std;

// Global variables
Mat frame; //current frame
Mat fgMaskMOG2; //fg mask fg mask generated by MOG method
Ptr<BackgroundSubtractor> pMOG2; //MOG Background subtractor
int keyboard; //input from keyboard

//new variables
int history = 1250;
float varThreshold = 16;
bool bShadowDetection = true;

/*
//added to remove the shadow
unsigned char nShadowDetection = 0;
float fTau = 0.5;
//static const unsigned char nShadowDetection =( unsigned char)0;
*/
// Function Headers
void help();
void processImages(char* firstFrameFilename);

void help()
{
cout
<< "This program shows how to use background subtraction methods provided   by "  << endl
<< " OpenCV. You can process  images (-img)."                                     << endl
<< "Usage:"                                                                     << endl
<< "./bs -img <image filename>}"                                                << endl
<< "for example: ./bs -img /data/images/1.png"                                  << endl
<< endl;
}

// morphological operation

void morphOps(Mat &thresh){

//create structuring element that will be used to "dilate" and "erode"   image.
//the element chosen here is a 3px by 3px rectangle

Mat erodeElement = getStructuringElement( MORPH_RECT,Size(2,2)); //3x3
//dilate with larger element so make sure object is nicely visible
Mat dilateElement = getStructuringElement( MORPH_RECT,Size(1,1)); //8x8

erode(thresh,thresh,erodeElement);
erode(thresh,thresh,erodeElement);dilate(thresh,thresh,dilateElement);
dilate(thresh,thresh,dilateElement);

}// main function

int main(int argc, char* argv[])
{

//print help information
help();

//check for the input parameter correctness
if(argc != 3) {
cerr <<"Incorret input list" << endl;
cerr <<"exiting..." << endl;
return EXIT_FAILURE;
}

//create GUI windows
namedWindow("Frame");
namedWindow("FG Mask MOG2 ");

//create Background Subtractor objects
//pMOG2 = new BackgroundSubtractorMOG2();
pMOG2 = new BackgroundSubtractorMOG2( history,   varThreshold,     bShadowDetection);
//BackgroundSubtractorMOG2(int history,  float varThreshold, bool   bShadowDetection=1);
if(strcmp(argv[1], "-img") == 0) {
//input data coming from a sequence of images
processImages(argv[2]);
}
else {
//error in reading input parameters
cerr <<"Please, check the input parameters." << endl;
cerr <<"Exiting..." << endl;
return EXIT_FAILURE;
}
//destroy GUI windows
destroyAllWindows();
return EXIT_SUCCESS;
}

//function processImages

void processImages(char* fistFrameFilename) {
//read the first file of the sequence
frame = imread(fistFrameFilename);
if(frame.empty()){
//error in opening the first image
cerr << "Unable to open first image frame: " << fistFrameFilename <<   endl;
exit(EXIT_FAILURE);

//current image filename
string fn(fistFrameFilename);
//read input data. ESC or 'q' for quitting
while( (char)keyboard != 'q' && (char)keyboard != 27 ){
//update the background model
pMOG2->operator()(frame, fgMaskMOG2,-1);
//get the frame number and write it on the current frame
size_t index = fn.find_last_of("/");
if(index == string::npos) {
index = fn.find_last_of("\\");
}
size_t index2 = fn.find_last_of(".");
string prefix = fn.substr(0,index+1);
string suffix = fn.substr(index2);
string frameNumberString = fn.substr(index+1, index2-index-1);
istringstream iss(frameNumberString);
int frameNumber = 0;
iss >> frameNumber;
rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
cv::Scalar(255,255,255), -1);
putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
//show the current frame and the fg masks
imshow("Frame", frame);
morphOps(fgMaskMOG2);
imshow("FG Mask MOG2 ", fgMaskMOG2);
//get the input from the keyboard
keyboard = waitKey(1);
//search for the next image in the sequence
ostringstream oss;
oss << (frameNumber + 1);
string nextFrameNumberString = oss.str();
string nextFrameFilename = prefix + nextFrameNumberString + suffix;
//read the next frame
frame = imread(nextFrameFilename);
if(frame.empty()){
//error in opening the next image in the sequence
cerr << "Unable to open image frame: " << nextFrameFilename << endl;
exit(EXIT_FAILURE);
}
//update the path of the current frame
fn.assign(nextFrameFilename);

// save subtracted images
string imageToSave =("output_MOG_" +  frameNumberString + ".png");
bool saved = imwrite(  "D:\\SO\\temp\\" +imageToSave,fgMaskMOG2);
if(!saved) {
cerr << "Unable to save " << imageToSave << endl;
}
}
}

}