CODEWITHSUNDEEP
javaopencvopencv3.0
Pramod b
Pramod b

Reputation: 3

OpenCV FeatureDetector doesn't seem to set various properties after reading it from file

Following is the code to detect blob/moles in colored skin image using Java and OpenCV 3.0

private void initLibService(){

    String opencvpath = System.getProperty("user.dir") + File.separator + "lib" + File.separator;
    System.load(opencvpath + Core.NATIVE_LIBRARY_NAME + ".dll");

    blobDetector = FeatureDetector.create(FeatureDetector.SIMPLEBLOB);

    try {
        File temp = File.createTempFile("tempFile",".tmp");
        String settings="%YAML:1.0\nthresholdStep: " + Integer.parseInt(ResourceUtil.getProperty("MOLE_THRESHOLD_STEPS")) + "\nminThreshold: "+ Integer.parseInt(ResourceUtil.getProperty("MOLE_UPPER_INTENSITY_THRESOLD")) + "\n";
        System.out.println("\nFeature detector setting data: " + settings + "\n\n");

        FileWriter writer=new FileWriter(temp,false);
        writer.write(settings);
        writer.close();

        blobDetector.read(temp.getPath());

        temp.deleteOnExit();
      }
     catch (  IOException e) {
        e.printStackTrace();
      }
    }

public static Mat detectBlob(String imagePath, FeatureDetector blobDetector) {

    // Read image
    Mat im = Imgcodecs.imread(imagePath);

    MatOfKeyPoint keypoints = new MatOfKeyPoint();

    blobDetector.detect(im, keypoints);
    System.out.println("keypoints: " + keypoints.toList());

    Mat im_with_keypoints = new Mat();
    Features2d.drawKeypoints(im, keypoints, im_with_keypoints, new Scalar(0, 255, 0), Features2d.DRAW_RICH_KEYPOINTS);

    return im_with_keypoints;
}

If I comment the line blobDetector.read(temp.getPath()); then the attached skin image is being marked with circles around some moles (may be using some default property values of featuredetector), but If I didn't, nothing get marked on the image.

enter image description here

Upvotes: 0

Views: 311

Answers (1)

Miki
Miki

Reputation: 41765

You need to specify all properties in your file, or the detector will be loaded incorrectly.

Your file should look like this (default values):

%YAML:1.0
thresholdStep: 10.
minThreshold: 50.
maxThreshold: 220.
minRepeatability: 2
minDistBetweenBlobs: 10.
filterByColor: 1
blobColor: 0
filterByArea: 1
minArea: 25.
maxArea: 5000.
filterByCircularity: 0
minCircularity: 8.0000001192092896e-001
maxCircularity: 3.4028234663852886e+038
filterByInertia: 1
minInertiaRatio: 1.0000000149011612e-001
maxInertiaRatio: 3.4028234663852886e+038
filterByConvexity: 1
minConvexity: 9.4999998807907104e-001
maxConvexity: 3.4028234663852886e+038

Upvotes: 1

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