Goal：
Image blending and function addWeighted()
Theory:
Source and: "Computer Vision: Algorithms and Applications"
Image mixing is pixel manipulation, the formula is as follows:
g( x ) = ( 1 - α ) f0(x)+αf1(x)
Source Code
#include "opencv2/imgcodecs.hpp"#include "opencv2/highgui.hpp"
#include <opencv2/opencv.hpp>
#include <iostream>
using namespace cv;
// we're NOT "using namespace std;" here, to avoid collisions between the beta variable and std::beta in c++17
using std::cin;
using std::cout;
using std::endl;
int main( void )
{
double alpha = 0.5; double beta; double input;
Mat src1, src2, dst;
cout << " Simple Linear Blender " << endl;
cout << "-----------------------" << endl;
cout << "* Enter alpha [0.0-1.0]: " << endl;;
//cin >>input;
input=0.4;
cout << input << endl;
// We use the alpha provided by the user if it is between 0 and 1
if( input >= 0 && input <= 1 )
{ alpha = input; }
src1 = imread( "lena.jpg" );
src2 = imread( "tong.jpg" );
cout << src1.channels() << endl;
cout << src2.channels() << endl;
if( src1.empty() ) { cout << "Error loading src1" << endl; return -1; }
if( src2.empty() ) { cout << "Error loading src2" << endl; return -1; }
beta = ( 1.0 - alpha );
cout << beta << endl;
resize(src2, src2, Size(src1.cols, src1.rows)); //改变图片尺寸大小，由于下一个函数addWeighted（）要求
addWeighted( src2, alpha, src1,beta, 0.0, dst); //the same size
namedWindow("Linear Blend",WINDOW_AUTOSIZE);
imshow( "Linear Blend", dst);
waitKey(0);
return 0;
}
Which needs to be explained: addWeighted( src1, alpha, src2, beta, gamma, dst) principle:
dst=α⋅src1+β⋅ s r c 2 + γ
CMakeLists.txt文件：
cmake_minimum_required(VERSION 2.8)
set(CMAKE_CXX_FLAGS "-std=c++11")
set(VMAKE_BUILD_TYPE "Debug")
project( DisplayImage )
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage main.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )
install(TARGETS DisplayImage RUNTIME DESTINATION bin)
The test results are as follows:
