mirror of
https://github.com/opencv/opencv.git
synced 2024-12-03 16:35:09 +08:00
b131dfeecd
These codes should be included into regular builds.
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/**
|
|
* @file BasicLinearTransforms.cpp
|
|
* @brief Simple program to change contrast and brightness
|
|
* @author OpenCV team
|
|
*/
|
|
|
|
#include "opencv2/highgui/highgui.hpp"
|
|
#include <iostream>
|
|
|
|
using namespace cv;
|
|
|
|
double alpha; /**< Simple contrast control */
|
|
int beta; /**< Simple brightness control */
|
|
|
|
/**
|
|
* @function main
|
|
* @brief Main function
|
|
*/
|
|
int main( int, char** argv )
|
|
{
|
|
/// Read image given by user
|
|
Mat image = imread( argv[1] );
|
|
Mat new_image = Mat::zeros( image.size(), image.type() );
|
|
|
|
/// Initialize values
|
|
std::cout<<" Basic Linear Transforms "<<std::endl;
|
|
std::cout<<"-------------------------"<<std::endl;
|
|
std::cout<<"* Enter the alpha value [1.0-3.0]: ";std::cin>>alpha;
|
|
std::cout<<"* Enter the beta value [0-100]: "; std::cin>>beta;
|
|
|
|
|
|
/// Do the operation new_image(i,j) = alpha*image(i,j) + beta
|
|
/// Instead of these 'for' loops we could have used simply:
|
|
/// image.convertTo(new_image, -1, alpha, beta);
|
|
/// but we wanted to show you how to access the pixels :)
|
|
for( int y = 0; y < image.rows; y++ )
|
|
{ for( int x = 0; x < image.cols; x++ )
|
|
{ for( int c = 0; c < 3; c++ )
|
|
{
|
|
new_image.at<Vec3b>(y,x)[c] = saturate_cast<uchar>( alpha*( image.at<Vec3b>(y,x)[c] ) + beta );
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Create Windows
|
|
namedWindow("Original Image", 1);
|
|
namedWindow("New Image", 1);
|
|
|
|
/// Show stuff
|
|
imshow("Original Image", image);
|
|
imshow("New Image", new_image);
|
|
|
|
|
|
/// Wait until user press some key
|
|
waitKey();
|
|
return 0;
|
|
}
|