opencv3/C++视频中叠加透明图片的实现

#include<opencv2/opencv.hpp>
using namespace cv;

//PNG透明图片叠加到视频
int main()
{
  Mat frame;
  VideoCapture capture;
  capture.open(0);
  if(!capture.isOpened())
  {
    printf("can not open the camear......\n");
    return -1;
  }
  namedWindow("mask", CV_WINDOW_AUTOSIZE);
  namedWindow("output", CV_WINDOW_AUTOSIZE);
  while (capture.read(frame))
  {
    //翻转摄像头图像
    flip(frame, frame, 1);
    Mat image = frame;   
    for (int i = 1; i < 11; i++)
    {
      char filename[100];
      sprintf(filename,"E:/image/image/00/%d.PNG",i);
      //灰度图
      Mat grayPng = imread(filename,0);      
      threshold(grayPng,grayPng,180,255,CV_THRESH_BINARY);
      //掩模反色
      Mat mask = 255 - grayPng; 
      imshow("mask",mask);
      //读取背景透明的PNG图像
      Mat png = imread(filename);
      Mat imROI;
      imROI = image(Rect(200,20,png.cols,png.rows));
      png.copyTo(imROI,mask);
      imshow("output",image);
      //替换新图
      image = frame;
      waitKey(10);
    }

  }
  waitKey();

  return 0;
}