代码：

#include
     
      using namespace cv;int brightness = 5;int contrast = 5;Mat src;Mat brightnessContrast;void BrightnessContrastFilter(int, void*){    float bri = brightness / 5.0f;    float cont = contrast / 5.0f;    //增亮图像    cv::Mat bright = src*(bri);    //平均亮度    float sum = 0;    for (int i = 0; i < bright.rows; i++){        for (int j = 0; j < bright.cols; j++){            sum += bright.at
      
       (i, j);        }    }    float aver = sum / (bright.cols*bright.rows);    cv::Mat averImg = cv::Mat::ones(bright.rows, bright.cols, bright.type());    averImg *= aver;    //根据contrast进行插值    brightnessContrast = (bright - averImg)*cont + averImg;    imshow("brightnessContrast", brightnessContrast);}int main(){    src = imread("densityGray.png", 0);    imshow("src", src);    namedWindow("brightnessContrast");    createTrackbar("brightness", "brightnessContrast", &brightness, 20, BrightnessContrastFilter);    createTrackbar("contrast", "brightnessContrast", &contrast, 20, BrightnessContrastFilter);    BrightnessContrastFilter(0, 0);    imshow("brightnessContrast", brightnessContrast);    waitKey();    destroyAllWindows();    return 0;}
      
     

效果：