Question

Write a matlablab code that does the following operations-

1. The next user function should allow the adjustment of the overall image brightness by adding or subtracting a constant by every pixel. The user should be prompted for the number to add/subtract.
2. The next user function should allow the adjustment of the overall image contrast by multiplying a constant to every pixel. The user should be prompted for the number to multiply.
3. The next user function should allow the adjustment of the overall image contrast by raising the value of every pixel to a constant power. The user should be prompted for the exponent.
4. The next user function should allow the resizing of the image. The user should be prompted for the new size. (“imresize” may be helpful)  

Answer 1

#include "opencv2/imgcodecs.hpp"

#include "opencv2/highgui.hpp"

#include <iostream>

// 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;

using namespace cv;

int main( int argc, char** argv )

{

CommandLineParser parser( argc, argv, "{@input | lena.jpg | input image}" );

Mat image = imread( samples::findFile( parser.get<String>( "@input" ) ) );

if( image.empty() )

{

cout << "Could not open or find the image!\n" << endl;

cout << "Usage: " << argv[0] << " <Input image>" << endl;

return -1;

}

Mat new_image = Mat::zeros( image.size(), image.type() );

double alpha = 1.0; /*< Simple contrast control */

int beta = 0; /*< Simple brightness control */

cout << " Basic Linear Transforms " << endl;

cout << "-------------------------" << endl;

cout << "* Enter the alpha value [1.0-3.0]: "; cin >> alpha;

cout << "* Enter the beta value [0-100]: "; cin >> beta;

for( int y = 0; y < image.rows; y++ ) {

for( int x = 0; x < image.cols; x++ ) {

for( int c = 0; c < image.channels(); c++ ) {

new_image.at<Vec3b>(y,x)[c] =

saturate_cast<uchar>( alpha*image.at<Vec3b>(y,x)[c] + beta );

}

}

}

imshow("Original Image", image);

imshow("New Image", new_image);

waitKey();

return 0;

}

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