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Add Java and Python code for the following tutorials:

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- Changing the contrast and brightness of an image!
      - Operations with images
This commit is contained in:
catree
2018-07-11 19:38:16 +02:00
parent a29d11240e
commit c9fe6f1afe
12 changed files with 1197 additions and 166 deletions
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samples/cpp/tutorial_code/ImgProc/BasicLinearTransforms.cpp
+14 -15
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@@ -20,29 +20,32 @@ using namespace cv;
*/
int main( int argc, char** argv )
{
//! [basic-linear-transform-parameters]
double alpha = 1.0; /*< Simple contrast control */
int beta = 0; /*< Simple brightness control */
//! [basic-linear-transform-parameters]
/// Read image given by user
//! [basic-linear-transform-load]
String imageName("../data/lena.jpg"); // by default
if (argc > 1)
CommandLineParser parser( argc, argv, "{@input | ../data/lena.jpg | input image}" );
Mat image = imread( parser.get<String>( "@input" ) );
if( image.empty() )
{
imageName = argv[1];
cout << "Could not open or find the image!\n" << endl;
cout << "Usage: " << argv[0] << " <Input image>" << endl;
return -1;
}
Mat image = imread( imageName );
//! [basic-linear-transform-load]
//! [basic-linear-transform-output]
Mat new_image = Mat::zeros( image.size(), image.type() );
//! [basic-linear-transform-output]
//! [basic-linear-transform-parameters]
double alpha = 1.0; /*< Simple contrast control */
int beta = 0; /*< Simple brightness control */
/// Initialize values
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;
//! [basic-linear-transform-parameters]
/// Do the operation new_image(i,j) = alpha*image(i,j) + beta
/// Instead of these 'for' loops we could have used simply:
@@ -51,19 +54,15 @@ int main( int argc, char** argv )
//! [basic-linear-transform-operation]
for( int y = 0; y < image.rows; y++ ) {
for( int x = 0; x < image.cols; x++ ) {
for( int c = 0; c < 3; c++ ) {
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 );
saturate_cast<uchar>( alpha*image.at<Vec3b>(y,x)[c] + beta );
}
}
}
//! [basic-linear-transform-operation]
//! [basic-linear-transform-display]
/// Create Windows
namedWindow("Original Image", WINDOW_AUTOSIZE);
namedWindow("New Image", WINDOW_AUTOSIZE);
/// Show stuff
imshow("Original Image", image);
imshow("New Image", new_image);