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Tutorial Sobel Derivatives

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This commit is contained in:
tribta
2017-08-22 12:28:23 +01:00
parent 3250f11f0c
commit f7d85bfed8
5 changed files with 243 additions and 29 deletions
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9
samples/cpp/tutorial_code/ImgTrans/Sobel_Demo.cpp
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@@ -30,6 +30,7 @@ int main( int argc, char** argv )
cout << "\nPress 'ESC' to exit program.\nPress 'R' to reset values ( ksize will be -1 equal to Scharr function )";
//![variables]
// First we declare the variables we are going to use
Mat image,src, src_gray;
Mat grad;
const String window_name = "Sobel Demo - Simple Edge Detector";
@@ -40,11 +41,14 @@ int main( int argc, char** argv )
//![variables]
//![load]
String imageName = parser.get<String>("@input"); // by default
String imageName = parser.get<String>("@input");
// As usual we load our source image (src)
image = imread( imageName, IMREAD_COLOR ); // Load an image
// Check if image is loaded fine
if( image.empty() )
{
printf("Error opening image: %s\n", imageName.c_str());
return 1;
}
//![load]
@@ -52,10 +56,12 @@ int main( int argc, char** argv )
for (;;)
{
//![reduce_noise]
// Remove noise by blurring with a Gaussian filter ( kernel size = 3 )
GaussianBlur(image, src, Size(3, 3), 0, 0, BORDER_DEFAULT);
//![reduce_noise]
//![convert_to_gray]
// Convert the image to grayscale
cvtColor(src, src_gray, COLOR_BGR2GRAY);
//![convert_to_gray]
@@ -72,6 +78,7 @@ int main( int argc, char** argv )
//![sobel]
//![convert]
// converting back to CV_8U
convertScaleAbs(grad_x, abs_grad_x);
convertScaleAbs(grad_y, abs_grad_y);
//![convert]