Enabled backends是什么原因，怎么解决

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/opencv.hpp>
#include <iostream>


using namespace cv;
using namespace std;

double alpha,bele;
//分离图像通道
vector<Mat> channels;


Mat frame;
Mat frame2;
Mat frame3;





void text(int, void*)
{
    alpha = 0;
    bele = 1.0;

    split(frame, channels);
    if (1)
        frame2 = channels.at(2) - channels.at(0);
    else
        frame2= channels.at(0) - channels.at(2);


    threshold(frame2,frame3,127,255,THRESH_BINARY);
    Mat element = getStructuringElement(MORPH_ELLIPSE,Size(3,3));

    dilate(frame3,frame3,element);

    vector<vector<Point>> lightContours;

    findContours(frame, lightContours, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);



    imshow("frame",frame );
}

int main(int, void*)
{
    VideoCapture capture("D:/1/1.avi");

   
    while (1)
    {
        
        capture >> frame;
        int i = 0;
        int max = 1;


        

  
            //imshow("red", channels.at(2));
           // imshow("green", channels.at(1));
            //imshow("blue", channels.at(0));

            
         

            Mat  midImage1 = channels.at(0) - channels.at(2);
            threshold(midImage1, midImage1, 100, 255, THRESH_BINARY);
            imshow("origina222", midImage1);


            namedWindow("测试窗口", WINDOW_NORMAL);
            //创建滑动条
            createTrackbar("数字：", "测试窗口：", &i, max, text);
            text(i, 0);



            if (waitKey(30) >= 0)
                break;

    }
    return 0;
}

Enabled backends不知道具体什么问题啊