3. 图像算数操作

• 加减乘除
• 利用加法调整图像亮度
• 调整图像亮度与对比度

1. 加减乘除
   输入图像的大小与类型必须一致
   处理越界

#include <opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv) {
    Mat src1 = imread("D:/HUANGHAI_WORK/tools/opencv4/opencv/sources/samples/data/WindowsLogo.jpg", IMREAD_UNCHANGED);
    Mat src2 = imread("D:/HUANGHAI_WORK/tools/opencv4/opencv/sources/samples/data/LinuxLogo.jpg", IMREAD_UNCHANGED);
    namedWindow("input1", WINDOW_NORMAL);
    imshow("input1", src1);
    imshow("input2", src2);
    //加
    Mat dst1;
    add(src1, src2, dst1);
    imshow("加", dst1);
    //减
    Mat dst2;
    subtract(src1, src2, dst2);
    imshow("减", dst2);
    //乘
    Mat dst3;
    multiply(src1, src2, dst3);
    imshow("乘", dst3);
    //除
    Mat dst4;
    divide(src1, src2, dst4);
    imshow("除", dst4);

    waitKey(0);
    destroyAllWindows();
    return 0;
}

image.png

2. 亮度和对比度

    //亮度
    Mat t1 = imread("D:/HUANGHAI_WORK/tools/opencv4/opencv/sources/samples/data/messi5.jpg");
    imshow("t1", t1);
    Mat black = Mat::zeros(t1.size(), t1.type());
    black = Scalar(127, 127, 127);
    Mat dst1;
    add(t1, black, dst1);
    imshow("dst1", dst1);

    //亮度和对比度
    Mat dst2;
    addWeighted(t1, 1.2, black, 0.5, 0.0, dst2);
    imshow("dst2", dst2);

image.png