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代码使用请遵循LGPL协议

输入：背景文件路径 logo文件路径 logo左上横坐标 纵坐标

#include<opencv2/opencv.hpp>
#include <iostream>
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<string>
using namespace cv;
using namespace std;
int main(int argc, char** argv) {
    string a1, b1;
    cin >> a1 >> b1;
    Mat srcImage1 = imread(a1);
    Mat logoImage = imread(b1);
    if (!srcImage1.data) { printf("background read error \n"); return false; }
    if (!logoImage.data) { printf("logo read error \n"); return false; }
    int x, y, width=0, hight=0,roix,roiy,maskx=0,masky=0;
    cin >> x >> y;
    roix = x; roiy = y;
    if (x >= 0 && x + logoImage.cols <= srcImage1.cols) {
        if (y < 0) {
            roiy = 0;
            width = logoImage.cols; hight = logoImage.rows + y;
        }
        else if (y + logoImage.rows > srcImage1.rows) {
            width = logoImage.cols; hight = srcImage1.rows - y;
            masky = -y;
        }
        else {
            width = logoImage.cols; hight = logoImage.rows;
        }
    }
    if (x + logoImage.cols > srcImage1.cols) {
        if (y < 0) {
            roiy = 0;
            width = srcImage1.cols - x; hight = logoImage.rows + y;
        }
        else if (y + logoImage.rows > srcImage1.rows) {
            width = srcImage1.cols - x; hight = srcImage1.rows - y;
            masky = -y;
        }
        else {
            width = srcImage1.cols - x; hight = logoImage.rows;
        }
    }
    if (x<0 ) {
        if (y < 0) {
            roix = 0; roiy = 0;
            width = x + logoImage.cols; hight = y+logoImage.rows;
            maskx = -x; masky = -y;
        }
        else if (y + logoImage.rows > srcImage1.rows) {
             roix = 0;
              width = x + logoImage.cols; hight = srcImage1.rows - y;
              maskx = -x;
            }
        else {
            roix = 0;
            width = x + logoImage.cols; hight =  logoImage.rows;
            maskx = -x;
        }
   }
    Mat  mask, imageROI = srcImage1(Rect(roix, roiy, width, hight));
    mask = logoImage(Rect(maskx, masky, width, hight));
    mask.copyTo(imageROI, mask);
    namedWindow("合成图");
    imshow("合成图", srcImage1);
    system("mkdir c:\\save");
    imwrite("C:/save/save.jpg", srcImage1);
    waitKey();
    return 0;
}

水一点文字

前六行头文件

七八行namespace（问就是懒）

8 69 70 主函数返回0清理内存

9 10定义两个string 分别是背景和logo的路径并且输入路径

11 12读取背景和路径

13 14判定图片是否存在（不存在报错并返回0）

15 16 定义并输入坐标

17-60处理坐标

61定义掩膜和roi并且裁剪roi

62裁剪掩膜

64-66定义窗口并显示

66开辟路径

67存储图片

68等待操作