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