Can anyone tell me that how can i detect keypoints of an image and draw that keypoints on that image in java? I tried smt but i couldn't figure out how to draw them? Any ideas for how should i proceed or any ideas for drawing for my code?
final IplImage image1 = cvLoadImage(
"C:/Users/Can/Desktop/panorama_image1.jpg",
CV_LOAD_IMAGE_GRAYSCALE);
final CanvasFrame canvas1 = new CanvasFrame("Image1");
canvas1.showImage(image1);
canvas1.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
SIFT sift = new SIFT();
KeyPoint keypoint1 = new KeyPoint();
sift.detect(image1, null, keypoint1);
System.out.println("Keypoints for image1: " + keypoint1.capacity());
If you or others still need an answer, I believe the possible way of doing that is
opencv_features2d.drawKeypoints(_image1, keypoint1, Mat.EMPTY);
Then you may save your _image1
to file using
ImageIO.write(_image1.getBufferedImage(), "png", new File("image1.png"));
But before that you'll have to open your image1
as a Mat object: Mat _image1 = new Mat(image1);
Assuming you or anyone else still requires this, you can do the following.
Using Java, after you have computed your keypoints you can do the following using the Features2d
class in OpenCV.
// draw keypoints on image
Mat outputImage = new Mat();
// Your image, keypoints, and output image
Features2d.drawKeypoints(image, keypoints, outputImage);
String filename = "keypoints.jpg";
System.out.println(String.format("Writing %s...", filename));
Highgui.imwrite(filename, outputImage);
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