BackgroundSubtraction Mog2中出现错误 [英] Error in BackgroundSubtraction Mog2

问题描述

我使用opencv 2.4.4，当我运行这个算法，它给我的错误在 nmixtures 和 bShadowDetection

I am using opencv 2.4.4 and when i run this algorithm on it , it give me the error on nmixtures and bShadowDetection

#include <iostream>
#include <sys/stat.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>
#include <opencv/cv.h>
#include "opencv2/features2d/features2d.hpp"
#include <opencv/highgui.h>
#include "opencv2/opencv.hpp"
#include "opencv2/core/core.hpp"
#include "opencv2/nonfree/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/calib3d/calib3d.hpp"
#include  <vector>
#pragma comment (lib , "opencv_core244d.lib")
#pragma comment (lib ,"opencv_highgui244d.lib")
#pragma comment(lib , "opencv_imgproc244d.lib")
#pragma comment(lib ,"opencv_video244.lib")
using namespace cv;
int main(int argc, char *argv[])
{
    cv::Mat frame;
    cv::Mat back;
    cv::Mat fore;
    cv::VideoCapture cap("try2.avi");
    cap >> frame;
    cv::initModule_video(); 
     cv::BackgroundSubtractorMOG2 bg(100, 16, true); // history is an int, distance_threshold is an int (usually set to 16), shadow_detection is a bool
     bg.set("nmixtures", 3);
     bg(frame, fore, -1); //learning_rate = -1 here
    std::vector<std::vector<cv::Point> > contours;
    cv::namedWindow("Frame");
    cv::namedWindow("Background");

    for(;;)
    {
        cap >> frame;
        bg.operator ()(frame,fore);
        bg.getBackgroundImage(back);
        cv::erode(fore,fore,cv::Mat());
        cv::dilate(fore,fore,cv::Mat());
        cv::findContours(fore,contours,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_NONE);
        cv::drawContours(frame,contours,-1,cv::Scalar(0,0,255),2);
        cv::imshow("Frame",frame);
        cv::imshow("Background",back);
        if(cv::waitKey(30) >= 0) break;
    }
    return 0;
}

错误

error C2248: 'cv::BackgroundSubtractorMOG2::nmixtures' : cannot access protected member declared in class 'cv::BackgroundSubtractorMOG2'
error C2248: 'cv::BackgroundSubtractorMOG2::bShadowDetection' : cannot access protected member declared in class 'cv::BackgroundSubtractorMOG2' 

，它没有给出语法错误，但在运行时给我错误。

When i use it like below , it didn't give syntax error , but give me error at runtime

bg.set("nmixtures", 3);
bg.set("detectShadows", false); 

错误

Unhandled exception at 0x7617812f in WK01.exe: Microsoft C++ exception: cv::Exception at memory location 0x001de2d0..
opencv error : Bad argument (no parameter nmixture is found) in unknown function 

感谢

推荐答案

您显示的错误说明（没有找到参数nmixture）。这里的问题是，您键入 nmixture 而不是 nmixtures 。

Your displayed error says (no parameter nmixture is found). The issue here is that you've typed nmixture instead of nmixtures.

阴影检测不能使用 .set（）函数设置;这是opencv中的一个错误。如果您要设置，请在你的构造函数中初始化它。以下是初始化背景模型的方法：

Shadow detection cannot be set using the .set() function; this is a bug in opencv. If you'd like to set it, you should initialize it in your constructor. Here is how you should initialize your background model:

cv::BackgroundSubtractorMOG2 bg(history, distance_threshold, shadow_detection); // history is an int, distance_threshold is an int (usually set to 16), shadow_detection is a bool

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