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package opencvtutorial;
/**
* @file opencvtutorial.SobelDemo.java
* @brief Sample code using Sobel and/or Scharr OpenCV functions to make a simple Edge Detector
*/
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.scijava.nativelib.NativeLoader;
class SobelDemoRun {
static {
try {
// Load the native OpenCV library
NativeLoader.loadLibrary(Core.NATIVE_LIBRARY_NAME);
} catch (Exception e) {
}
}
public void run(String[] args) {
// ! [declare_variables]
// First we declare the variables we are going to use
Mat src, src_gray = new Mat();
Mat grad = new Mat();
String window_name = "Sobel Demo - Simple Edge Detector";
int scale = 1;
int delta = 0;
int ddepth = CvType.CV_16S;
// ! [declare_variables]
// ! [load]
// As usual we load our source image (src)
// Check number of arguments
if (args.length == 0) {
System.out.println("Not enough parameters!");
System.out.println("Program Arguments: [image_path]");
System.exit(-1);
}
// Load the image
src = Imgcodecs.imread(args[0]);
// Check if image is loaded fine
if (src.empty()) {
System.out.println("Error opening image: " + args[0]);
System.exit(-1);
}
// ! [load]
// ! [reduce_noise]
// Remove noise by blurring with a Gaussian filter ( kernel size = 3 )
Imgproc.GaussianBlur(src, src, new Size(3, 3), 0, 0, Core.BORDER_DEFAULT);
// ! [reduce_noise]
// ! [convert_to_gray]
// Convert the image to grayscale
Imgproc.cvtColor(src, src_gray, Imgproc.COLOR_RGB2GRAY);
// ! [convert_to_gray]
// ! [sobel]
/// Generate grad_x and grad_y
Mat grad_x = new Mat(), grad_y = new Mat();
Mat abs_grad_x = new Mat(), abs_grad_y = new Mat();
/// Gradient X
// Imgproc.Scharr( src_gray, grad_x, ddepth, 1, 0, scale, delta,
/// Core.BORDER_DEFAULT );
Imgproc.Sobel(src_gray, grad_x, ddepth, 1, 0, 3, scale, delta, Core.BORDER_DEFAULT);
/// Gradient Y
// Imgproc.Scharr( src_gray, grad_y, ddepth, 0, 1, scale, delta,
/// Core.BORDER_DEFAULT );
Imgproc.Sobel(src_gray, grad_y, ddepth, 0, 1, 3, scale, delta, Core.BORDER_DEFAULT);
// ! [sobel]
// ![convert]
// converting back to CV_8U
Core.convertScaleAbs(grad_x, abs_grad_x);
Core.convertScaleAbs(grad_y, abs_grad_y);
// ![convert]
// ! [add_weighted]
/// Total Gradient (approximate)
Core.addWeighted(abs_grad_x, 0.5, abs_grad_y, 0.5, 0, grad);
// ! [add_weighted]
// ! [display]
HighGui.imshow(window_name, grad);
HighGui.waitKey(0);
// ! [display]
System.exit(0);
}
}
public class SobelDemo {
public static void main(String[] args) {
new SobelDemoRun().run(args);
}
}