I am doing video watermarking in dct using C++ ..code is as shown below I have mainly two problems 1. I cant see watermark in watermarked video. What should i do so watermark becomes visible..I change scales of DCT coe. of watermark but i did not get the desired result..
#include"opencv2\highgui\highgui.hpp"
#include "opencv2\core\core.hpp"
#include<opencv2\imgproc\imgproc.hpp>
#include<iostream>
#include<math.h>
using namespace std;
using namespace cv;
void wat();
void ext();
Mat img,img1;
int main()
{
wat();
Mat f1,f2,f3,f4;
VideoCapture cap("C:\\Users\\MAHAVIR\\Desktop\\1.3gp");
if(!cap.isOpened())
{
cout<<"File is Missing"<<endl; //File is not opened
return -1;
}
double fps=cap.get(CV_CAP_PROP_FPS);
double cnt=cap.get(7);
VideoWriter v ("C:/Users/MAHAVIR/Desktop/out.avi",-1,fps,Size(256,256),true); //initialize the VideoWriter object
if ( !v.isOpened() ) //if not initialize the VideoWriter successfully, exit the program
{
cout << "ERROR: Failed to write the video" << endl;
return -1;
}
cout<<"Frame rate is"<<fps<<endl;
cout<<"Frame Count is"<<cnt<<endl;
namedWindow("Input Video",CV_WINDOW_AUTOSIZE);
for(int i=0;i<cnt;i++)
{
Mat frame;
bool f=cap.read(frame);
if (!f) //if not success, break loop
{
cout << "Cannot read the frame from video file" << endl;
break;
}
cvtColor(frame,f1,CV_RGB2GRAY);
resize(f1,f2,Size(256,256));
imshow("Input Video",f2);
f2.convertTo(f2,CV_32F);
dct(f2,f2,0);
f2.copyTo(f3);
for(int m=0;m<2;m++)
{
for(int n=0;n<2;n++)
{
float p,q,r;
p=f2.at<float>(m,n);
//cout<<"Val"<<p<<endl;
q=img1.at<float>(m,n);
//cout<<"\tVal"<<q<<endl;
r=p+q;
//cout<<"\t\tVal"<<r<<endl;
f3.at<float>(m,n)=r;
}
}
idct(f3,f3);
f3.convertTo(f3,CV_8U);
v.write(f3);
imshow("Watermarked Video",f3);
waitKey(10);
}
waitKey(10);
ext();
cvDestroyWindow("Input Video");
cvDestroyWindow("WaterMarked Video");
return 0;
}
void wat()
{
img=imread("C:\\Users\\MAHAVIR\\Documents\\MATLAB\\host image.jpg",CV_LOAD_IMAGE_UNCHANGED);
cvtColor(img,img,CV_RGB2GRAY);
if (img.empty()) //check whether the image is loaded or not
{
cout << "Error : Image cannot be loaded..!!" << endl;
//system("pause"); //wait for a key press
}
else
{
//img.resize(img1,(64,64));
namedWindow("Watermark", CV_WINDOW_AUTOSIZE); //create a window with the name "MyWindow"
imshow("Watermark", img); //display the image which is stored in the 'img' in the "MyWindow" window
img.convertTo(img,CV_32F,(1.0),(0.0));
dct(img,img,0);
img.copyTo(img1);
}
}