Example usage for org.opencv.core Rect tl

List of usage examples for org.opencv.core Rect tl

Introduction

In this page you can find the example usage for org.opencv.core Rect tl.

Prototype

public Point tl() 

Source Link

Usage

From source file:OctoEye.java

License:Open Source License

private void detectPupil() {
    // min and max pupil radius
    int r_min = 2;
    int r_max = 45;

    // min and max pupil diameter
    int d_min = 2 * r_min;
    int d_max = 2 * r_max;

    // min and max pupil area
    double area;/*  w w w .j  a v  a  2s  .  c  o  m*/
    double a_min = Math.PI * r_min * r_min;
    double a_max = Math.PI * r_max * r_max;

    // histogram stuff
    List<Mat> images;
    MatOfInt channels;
    Mat mask;
    Mat hist;
    MatOfInt mHistSize;
    MatOfFloat mRanges;

    // contour and circle stuff
    Rect rect = null;
    Rect rectMin;
    Rect rectMax;
    List<MatOfPoint> contours;
    MatOfPoint3 circles;

    // pupil center
    Point p;

    // ellipse test points
    Point v;
    Point r;
    Point s;

    // rect points
    Point tl;
    Point br;

    // pupil edge detection
    Vector<Point> pointsTest;
    Vector<Point> pointsEllipse;
    Vector<Point> pointsRemoved;

    // temporary variables
    double distance;
    double rad;
    double length;
    int x;
    int y;
    int tmp;
    byte buff[];

    // -------------------------------------------------------------------------------------------------------------
    // step 1
    // blur the image to reduce noise

    Imgproc.medianBlur(src, tmp1, 25);

    // -------------------------------------------------------------------------------------------------------------
    // step 2
    // locate the pupil with feature detection and compute a histogram for each,
    // the best feature will be used as rough pupil location (rectMin)

    int score = 0;
    int winner = 0;

    // feature detection
    MatOfKeyPoint matOfKeyPoints = new MatOfKeyPoint();
    FeatureDetector blobDetector = FeatureDetector.create(FeatureDetector.MSER); // Maximal Stable Extremal Regions
    blobDetector.detect(tmp1, matOfKeyPoints);
    List<KeyPoint> keyPoints = matOfKeyPoints.toList();

    // histogram calculation
    for (int i = 0; i < keyPoints.size(); i++) {
        x = (int) keyPoints.get(i).pt.x;
        y = (int) keyPoints.get(i).pt.y;
        tl = new Point(x - 5 >= 0 ? x - 5 : 0, y - 5 >= 0 ? y - 5 : 0);
        br = new Point(x + 5 < WIDTH ? x + 5 : WIDTH - 1, y + 5 < HEIGHT ? y + 5 : HEIGHT - 1);

        images = new ArrayList<Mat>();
        images.add(tmp1.submat(new Rect(tl, br)));
        channels = new MatOfInt(0);
        mask = new Mat();
        hist = new Mat();
        mHistSize = new MatOfInt(256);
        mRanges = new MatOfFloat(0f, 256f);
        Imgproc.calcHist(images, channels, mask, hist, mHistSize, mRanges);

        tmp = 0;
        for (int j = 0; j < 256 / 3; j++) {
            tmp += (256 / 3 - j) * (int) hist.get(j, 0)[0];
        }
        if (tmp >= score) {
            score = tmp;
            winner = i;
            rect = new Rect(tl, br);
        }

        if (debug) {
            // show features (orange)
            Core.circle(dbg, new Point(x, y), 3, ORANGE);
        }
    }
    if (rect == null) {
        return;
    }
    rectMin = rect.clone();

    if (debug) {
        // show rectMin (red)
        Core.rectangle(dbg, rectMin.tl(), rect.br(), RED, 1);
    }

    // -------------------------------------------------------------------------------------------------------------
    // step 3
    // compute a rectMax (blue) which is larger than the pupil

    int margin = 32;

    rect.x = rect.x - margin;
    rect.y = rect.y - margin;
    rect.width = rect.width + 2 * margin;
    rect.height = rect.height + 2 * margin;

    rectMax = rect.clone();

    if (debug) {
        // show features (orange)
        Core.rectangle(dbg, rectMax.tl(), rectMax.br(), BLUE);
    }

    // -------------------------------------------------------------------------------------------------------------
    // step 4
    // blur the image again

    Imgproc.medianBlur(src, tmp1, 7);
    Imgproc.medianBlur(tmp1, tmp1, 3);
    Imgproc.medianBlur(tmp1, tmp1, 3);
    Imgproc.medianBlur(tmp1, tmp1, 3);

    // -------------------------------------------------------------------------------------------------------------
    // step 5
    // detect edges

    Imgproc.Canny(tmp1, tmp2, 40, 50);

    // -------------------------------------------------------------------------------------------------------------
    // step 6
    // from pupil center to maxRect borders, find all edge points, compute a first ellipse

    p = new Point(rectMin.x + rectMin.width / 2, rectMin.y + rectMin.height / 2);
    pointsTest = new Vector<Point>();
    pointsEllipse = new Vector<Point>();
    pointsRemoved = new Vector<Point>();
    buff = new byte[tmp2.rows() * tmp2.cols()];
    tmp2.get(0, 0, buff);

    length = Math.min(p.x - rectMax.x - 3, p.y - rectMax.y - 3);
    length = Math.sqrt(2 * Math.pow(length, 2));
    Point z = new Point(p.x, p.y - length);
    for (int i = 0; i < 360; i += 15) {
        rad = Math.toRadians(i);
        x = (int) (p.x + Math.cos(rad) * (z.x - p.x) - Math.sin(rad) * (z.y - p.y));
        y = (int) (p.y + Math.sin(rad) * (z.x - p.x) - Math.cos(rad) * (z.y - p.y));
        pointsTest.add(new Point(x, y));
    }

    if (debug) {
        for (int i = 0; i < pointsTest.size(); i++) {
            Core.line(dbg, p, pointsTest.get(i), GRAY, 1);
            Core.rectangle(dbg, rectMin.tl(), rectMin.br(), GREEN, 1);
            Core.rectangle(dbg, rectMax.tl(), rectMax.br(), BLUE, 1);
        }
        Core.rectangle(dbg, rectMin.tl(), rectMin.br(), BLACK, -1);
        Core.rectangle(dbg, rectMin.tl(), rectMin.br(), RED, 1);
        Core.rectangle(dbg, rectMax.tl(), rectMax.br(), BLUE);
    }

    // p: Ursprung ("Mittelpunkt" der Ellipse)
    // v: Zielpunkt (Testpunkt)
    // r: Richtungsvektor PV
    for (int i = 0; i < pointsTest.size(); i++) {
        v = new Point(pointsTest.get(i).x, pointsTest.get(i).y);
        r = new Point(v.x - p.x, v.y - p.y);
        length = Math.sqrt(Math.pow(p.x - v.x, 2) + Math.pow(p.y - v.y, 2));
        boolean found = false;
        for (int j = 0; j < Math.round(length); j++) {
            s = new Point(Math.rint(p.x + (double) j / length * r.x),
                    Math.rint(p.y + (double) j / length * r.y));
            s.x = Math.max(1, Math.min(s.x, WIDTH - 2));
            s.y = Math.max(1, Math.min(s.y, HEIGHT - 2));
            tl = new Point(s.x - 1, s.y - 1);
            br = new Point(s.x + 1, s.y + 1);
            buff = new byte[3 * 3];
            rect = new Rect(tl, br);
            try {
                (tmp2.submat(rect)).get(0, 0, buff);
                for (int k = 0; k < 3 * 3; k++) {
                    if (Math.abs(buff[k]) == 1) {
                        pointsEllipse.add(s);
                        found = true;
                        break;
                    }
                }
            } catch (Exception e) {
                break;
            }
            if (found) {
                break;
            }
        }
    }

    double e_min = Double.POSITIVE_INFINITY;
    double e_max = 0;
    double e_med = 0;
    for (int i = 0; i < pointsEllipse.size(); i++) {
        v = pointsEllipse.get(i);
        length = Math.sqrt(Math.pow(p.x - v.x, 2) + Math.pow(p.y - v.y, 2));
        e_min = (length < e_min) ? length : e_min;
        e_max = (length > e_max) ? length : e_max;
        e_med = e_med + length;
    }
    e_med = e_med / pointsEllipse.size();
    if (pointsEllipse.size() >= 5) {
        Point[] points1 = new Point[pointsEllipse.size()];
        for (int i = 0; i < pointsEllipse.size(); i++) {
            points1[i] = pointsEllipse.get(i);
        }
        MatOfPoint2f points2 = new MatOfPoint2f();
        points2.fromArray(points1);
        pupil = Imgproc.fitEllipse(points2);
    }
    if (pupil.center.x == 0 && pupil.center.y == 0) {
        // something went wrong, return null
        reset();
        return;
    }

    if (debug) {
        Core.ellipse(dbg, pupil, PURPLE, 2);
    }

    // -------------------------------------------------------------------------------------------------------------
    // step 7
    // remove some outlier points and compute the ellipse again

    try {
        for (int i = 1; i <= 4; i++) {
            distance = 0;
            int remove = 0;
            for (int j = pointsEllipse.size() - 1; j >= 0; j--) {
                v = pointsEllipse.get(j);
                length = Math.sqrt(Math.pow(v.x - pupil.center.x, 2) + Math.pow(v.y - pupil.center.y, 2));
                if (length > distance) {
                    distance = length;
                    remove = j;
                }
            }
            v = pointsEllipse.get(remove);
            pointsEllipse.removeElementAt(remove);
            pointsRemoved.add(v);
        }
    } catch (Exception e) {
        // something went wrong, return null
        reset();
        return;
    }
    if (pointsEllipse.size() >= 5) {
        Point[] points1 = new Point[pointsEllipse.size()];
        for (int i = 0; i < pointsEllipse.size(); i++) {
            points1[i] = pointsEllipse.get(i);
        }
        MatOfPoint2f points2 = new MatOfPoint2f();
        points2.fromArray(points1);
        pupil = Imgproc.fitEllipse(points2);

        Point[] vertices = new Point[4];
        pupil.points(vertices);
        double d1 = Math
                .sqrt(Math.pow(vertices[1].x - vertices[0].x, 2) + Math.pow(vertices[1].y - vertices[0].y, 2));
        double d2 = Math
                .sqrt(Math.pow(vertices[2].x - vertices[1].x, 2) + Math.pow(vertices[2].y - vertices[1].y, 2));

        if (d1 >= d2) {
            pupilMajorAxis = (int) (d1 / 2);
            pupilMinorAxis = (int) (d2 / 2);
            axisA = new Point(vertices[1].x + (vertices[2].x - vertices[1].x) / 2,
                    vertices[1].y + (vertices[2].y - vertices[1].y) / 2);
            axisB = new Point(vertices[0].x + (vertices[1].x - vertices[0].x) / 2,
                    vertices[0].y + (vertices[1].y - vertices[0].y) / 2);
        } else {
            pupilMajorAxis = (int) (d2 / 2);
            pupilMinorAxis = (int) (d1 / 2);
            axisB = new Point(vertices[1].x + (vertices[2].x - vertices[1].x) / 2,
                    vertices[1].y + (vertices[2].y - vertices[1].y) / 2);
            axisA = new Point(vertices[0].x + (vertices[1].x - vertices[0].x) / 2,
                    vertices[0].y + (vertices[1].y - vertices[0].y) / 2);
        }
    }

    double ratio = (double) pupilMinorAxis / (double) pupilMajorAxis;
    if (ratio < 0.75 || 2 * pupilMinorAxis <= d_min || 2 * pupilMajorAxis >= d_max) {
        // something went wrong, return null
        reset();
        return;
    }

    // pupil found
    if (debug) {
        Core.ellipse(dbg, pupil, GREEN, 2);
        Core.line(dbg, pupil.center, axisA, RED, 2);
        Core.line(dbg, pupil.center, axisB, BLUE, 2);
        Core.circle(dbg, pupil.center, 1, GREEN, 0);

        x = 5;
        y = 5;
        Core.rectangle(dbg, new Point(x, y), new Point(x + 80 + 4, y + 10), BLACK, -1);
        Core.rectangle(dbg, new Point(x + 2, y + 2), new Point(x + 2 + pupilMajorAxis, y + 4), RED, -1);
        Core.rectangle(dbg, new Point(x + 2, y + 6), new Point(x + 2 + pupilMinorAxis, y + 8), BLUE, -1);

        for (int i = pointsEllipse.size() - 1; i >= 0; i--) {
            Core.circle(dbg, pointsEllipse.get(i), 2, ORANGE, -1);
        }
        for (int i = pointsRemoved.size() - 1; i >= 0; i--) {
            Core.circle(dbg, pointsRemoved.get(i), 2, PURPLE, -1);
        }
    }
    Core.ellipse(dst, pupil, GREEN, 2);
    Core.circle(dst, pupil.center, 1, GREEN, 0);
}

From source file:by.zuyeu.deyestracker.core.detection.DemoPanel.java

private static void addRectangleToImage(Rect face, Mat webcamImage, final Scalar color) {
    Core.rectangle(webcamImage, face.tl(), face.br(), color);
}

From source file:by.zuyeu.deyestracker.core.util.CVCoreUtils.java

public static void fixRectTLFromSubmat(Rect[] eyes, Rect subRect) {
    final Point shiftPoint = subRect != null ? subRect.tl() : new Point(0, 0);
    Arrays.stream(eyes).forEach(p -> {
        p.x += shiftPoint.x;/*  ww  w .j  ava  2 s. c o  m*/
        p.y += shiftPoint.y;
    });
}

From source file:ch.zhaw.facerecognitionlibrary.Helpers.MatOperation.java

License:Open Source License

public static Point drawRectangleOnPreview(Mat img, Rect face, boolean front_camera) {
    if (front_camera) {
        int topLeftX = (int) (img.cols() - (face.tl().x + face.width));
        int bottomRightX = (int) (img.cols() - (face.br().x) + face.width);
        Point tl = new Point(topLeftX, face.tl().y);
        Point br = new Point(bottomRightX, face.br().y);
        Imgproc.rectangle(img, tl, br, FACE_RECT_COLOR, THICKNESS);
        return tl;
    } else {//from   www.  ja  v a 2  s  . c o  m
        Imgproc.rectangle(img, face.tl(), face.br(), FACE_RECT_COLOR, THICKNESS);
        return face.tl();
    }
}

From source file:classes.BlobsFinder.java

public void findBlobContours() {

    Mat grayImage = new Mat();
    Imgproc.cvtColor(image, grayImage, Imgproc.COLOR_BGR2GRAY);
    ImageUtils.saveImage(grayImage, outImageName + "_grayImage.png", request);

    Mat gaussianImage = new Mat();
    Imgproc.GaussianBlur(grayImage, gaussianImage, new Size(0, 0), 3);
    Core.addWeighted(grayImage, 1.5, gaussianImage, -1, 0, gaussianImage);
    ImageUtils.saveImage(gaussianImage, outImageName + "_gaussianGrayImage.png", request);

    Mat binaryImage = new Mat();
    Imgproc.adaptiveThreshold(gaussianImage, binaryImage, 255, Imgproc.ADAPTIVE_THRESH_GAUSSIAN_C,
            Imgproc.THRESH_BINARY_INV, 15, 4);
    ImageUtils.saveImage(binaryImage, outImageName + "_binaryImage.png", request);

    Mat erodedImage = new Mat();

    binaryImage.copyTo(erodedImage);/*from   w  w  w. ja va2 s . c  o m*/

    Mat structuringElement = Imgproc.getStructuringElement(Imgproc.MORPH_RECT, new Size(3, 3));
    Point anchor = new Point(-1, -1);

    Imgproc.morphologyEx(erodedImage, erodedImage, Imgproc.MORPH_CLOSE, structuringElement, anchor, 1);
    ImageUtils.saveImage(erodedImage, outImageName + "_erodedImage.png", request);

    List<MatOfPoint> contours = new ArrayList<MatOfPoint>();

    Imgproc.findContours(erodedImage, contours, new Mat(), Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);

    Mat originalContoursImage = new Mat(image.size(), CvType.CV_8UC1, new Scalar(0));
    Scalar contourColor = new Scalar(255);
    int thickness = -1; // Thicknes should be lower than zero in order to drawn the filled contours
    Imgproc.drawContours(originalContoursImage, contours, -1, contourColor, thickness); // Drawing all the contours found
    ImageUtils.saveImage(originalContoursImage, outImageName + "_originalContoursImage.png", request);

    Mat erodedContoursImage = new Mat();
    Imgproc.erode(originalContoursImage, erodedContoursImage, structuringElement, anchor, 1);
    ImageUtils.saveImage(erodedContoursImage, outImageName + "_erodedContoursImage.png", request);

    ArrayList<MatOfPoint> finalContours = new ArrayList<MatOfPoint>();
    Mat finalContourImage = new Mat(image.size(), CvType.CV_8UC1, new Scalar(0));
    Imgproc.findContours(erodedContoursImage, finalContours, new Mat(), Imgproc.RETR_EXTERNAL,
            Imgproc.CHAIN_APPROX_SIMPLE);

    for (int i = 0; i < finalContours.size(); i++) {
        MatOfPoint currentContour = finalContours.get(i);
        double area = Imgproc.contourArea(currentContour);
        if (area > MIN_AREA) {

            validContours.add(currentContour);

            String fabricPath = generateFabricPathString(currentContour);
            contourPaths.add(fabricPath);

            Rect boundingRect = Imgproc.boundingRect(currentContour);
            topLeftCorners.add(boundingRect.tl());

            contoursAreas.add(area);
        }
    }

    // Drawing ALL the valid contours
    Imgproc.drawContours(finalContourImage, validContours, -1, contourColor, thickness);
    ImageUtils.saveImage(finalContourImage, outImageName + "_finalContourImage.png", request);

}

From source file:classes.TextExtractor.java

public void extractText(Rect roi, double roiAngle) throws Exception {

    Point roiTopLeft = roi.tl();

    double radians = Math.toRadians(roiAngle);
    double sin = Math.abs(Math.sin(radians));
    double cos = Math.abs(Math.cos(radians));

    int newWidth = (int) (image.width() * cos + image.height() * sin);
    int newHeight = (int) (image.width() * sin + image.height() * cos);

    int[] newWidthHeight = { newWidth, newHeight };

    int pivotX = newWidthHeight[0] / 2;
    int pivotY = newWidthHeight[1] / 2;

    Point center = new Point(pivotX, pivotY);

    Size targetSize = new Size(newWidthHeight[0], newWidthHeight[1]);

    Mat intermediateImage = new Mat(targetSize, image.type());

    int offsetX = (newWidthHeight[0] - image.width()) / 2;
    int offsetY = (newWidthHeight[1] - image.height()) / 2;

    Point paddedTopLeft = new Point(roiTopLeft.x + offsetX, roiTopLeft.y + offsetY);

    Mat containerImage = intermediateImage.submat(offsetY, offsetY + image.height(), offsetX,
            offsetX + image.width());// w  w  w.  j ava  2s  .c  om
    image.copyTo(containerImage);

    Mat rotationMatrix = Imgproc.getRotationMatrix2D(center, roiAngle, 1.0);

    Point transformedTopLeft = transformPoint(paddedTopLeft, rotationMatrix);

    Mat rotatedImage = new Mat();
    Imgproc.warpAffine(intermediateImage, rotatedImage, rotationMatrix, targetSize, Imgproc.INTER_LINEAR,
            Imgproc.BORDER_CONSTANT, new Scalar(0));

    ImageUtils.saveImage(rotatedImage, imageID + "_rotatedImage.png", request);

    double adjustedWidth = roi.size().width;
    double adjustedHeight = roi.size().height;

    if (transformedTopLeft.x + adjustedWidth > rotatedImage.width()) {
        adjustedWidth = rotatedImage.width() - transformedTopLeft.x;
    }

    if (transformedTopLeft.y + adjustedHeight > rotatedImage.height()) {
        adjustedHeight = rotatedImage.height() - transformedTopLeft.y;
    }

    Rect newROI = new Rect(transformedTopLeft, new Size(adjustedWidth, adjustedHeight));

    Mat extractedROI = new Mat(rotatedImage, newROI);

    String fileName = ImageUtils.saveImage(extractedROI, imageID + "_ROI.png", request);

    extractText(fileName);
}

From source file:com.astrocytes.core.operationsengine.CoreOperations.java

License:Open Source License

/**
 * Calculates an average intensity of pixels on image within specified contour.
 *
 * @param src - source image used for calculating an average intensity.
 * @param contour - a contour which is presented as some region of interest for operation.
 * @return a level of average intensity.
 *//*from   w w  w .j  av  a2  s .  c om*/
public static int averageIntensity(Mat src, MatOfPoint contour) {
    int averageIntensityWithinContour = 0;
    int quantityOfPixelsWithinContour = 0;
    Rect boundingRectangle = boundingRect(contour);

    for (int xCoord = (int) boundingRectangle.tl().x; xCoord <= (int) boundingRectangle.br().x; xCoord++) {
        for (int yCoord = (int) boundingRectangle.tl().y; yCoord <= (int) boundingRectangle.br().y; yCoord++) {
            if (pointPolygonTest(new MatOfPoint2f(contour.toArray()), new Point(xCoord, yCoord), false) > 0) {
                averageIntensityWithinContour += intensity(src, xCoord, yCoord);
                quantityOfPixelsWithinContour++;
            }
        }
    }

    if (quantityOfPixelsWithinContour == 0) {
        quantityOfPixelsWithinContour = 1;
        averageIntensityWithinContour = intensity(src, boundingRectangle.x, boundingRectangle.y);
        if (src.channels() == 1) {
            averageIntensityWithinContour = averageIntensityWithinContour > 127 ? 0 : 255;
        }
    }

    return averageIntensityWithinContour / quantityOfPixelsWithinContour;
}

From source file:com.astrocytes.core.operationsengine.OperationsImpl.java

License:Open Source License

private void detectAstrocytesOld(Mat source, Integer averageRectSize, Double averageArea, int intensity) {
    if (source.channels() == 3) {
        source = CoreOperations.grayscale(source);
    }// ww w  . ja v  a  2 s.c  om

    astrocytesCenters = new ArrayList<>();
    List<MatOfPoint> contoursAfterFirstIteration = new ArrayList<>();
    Mat hierarchy = new Mat();

    /* Step 1 */
    findContours(source, contoursAfterFirstIteration, hierarchy, Imgproc.RETR_LIST,
            Imgproc.CHAIN_APPROX_TC89_L1);

    for (MatOfPoint contour : contoursAfterFirstIteration) {
        Rect boundingRectangle = boundingRect(contour);
        Double contourArea = contourArea(contour);
        Double contourPerimeter = arcLength(new MatOfPoint2f(contour.toArray()), true);

        /* Step 2 */
        if (averageArea - 160 <= contourArea /*&& contourArea <= averageArea + 10*/) {
            /* Step 3 */
            if (((averageRectSize - 15 <= boundingRectangle.width)
                    && (boundingRectangle.width <= averageRectSize + 15)
                    || (averageRectSize - 15 <= boundingRectangle.height)
                            && (boundingRectangle.height <= averageRectSize + 15))
                    && (boundingRectangle.width / (float) boundingRectangle.height < 1.8f)
                    && (boundingRectangle.height / (float) boundingRectangle.width < 1.8f)) {
                /* Step 4 */
                if (contourArea / (contourPerimeter * contourPerimeter) > 0.05
                        && contourArea / (contourPerimeter * contourPerimeter) < 0.30) {
                    int averageIntensityWithinContour = CoreOperations.averageIntensity(sourceImage, contour);

                    /* Step 5 */
                    if (averageIntensityWithinContour <= intensity + 20) {
                        int xCoordOfAstrocyteCenter = (int) boundingRectangle.tl().x
                                + boundingRectangle.width / 2;
                        int yCoordOfAstrocyteCenter = (int) boundingRectangle.tl().y
                                + boundingRectangle.height / 2;
                        astrocytesCenters.add(new Point(xCoordOfAstrocyteCenter, yCoordOfAstrocyteCenter));
                    }
                }
            }
        }
    }
}

From source file:com.example.afs.makingmusic.process.ImageGenerator.java

License:Open Source License

@Override
public void process(Frame frame) {
    Mat image = frame.getImageMatrix();//from   w w w.  j  a va  2 s . c om
    for (MusicAnnotation musicAnnotation : frame.getMusicAnnotations()) {
        Scalar color;
        Type type = musicAnnotation.getType();
        switch (type) {
        case NEW:
            color = GREEN;
            break;
        case ACTIVE:
            color = BLUE;
            break;
        case DUPLICATE:
            color = YELLOW;
            break;
        case OVERFLOW:
            color = RED;
            break;
        default:
            throw new UnsupportedOperationException();
        }
        Rect item = musicAnnotation.getItem();
        Imgproc.rectangle(image, item.br(), item.tl(), color, 1);
        //Imgproc.putText(image, musicAnnotation.getInstrument().getName(), item.tl(), Core.FONT_HERSHEY_PLAIN, 1d, color);
    }
    BufferedImage bufferedImage = toBufferedImage(image);
    frame.setBufferedImage(bufferedImage);
}

From source file:com.mycompany.objectdetection.ObjectDetector.java

public void findObjects() {

    //        Imgproc.cvtColor(img, imgGrayscale, Imgproc.COLOR_RGBA2GRAY, 1); 
    //        Core.convertScaleAbs(img, imgGrayscale);
    //        Core.normalize(imgGrayscale, imgMeanShifted, 0.0, 1.0, NORM_MINMAX);
    preProcessImg();//from w w w  .  j a  v  a  2 s .c  om

    toGrayScale(imgMeanShifted);
    detectEdges(imgGrayscale);
    Imgproc.findContours(imgCanny, contours, imgCanny, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);
    objList = new ArrayList();

    for (MatOfPoint mop : contours) {
        MatOfPoint2f m2p;
        m2p = new MatOfPoint2f(mop.toArray());
        Double peri = Imgproc.arcLength(m2p, true);
        Imgproc.approxPolyDP(m2p, m2p, 0.02 * peri, true);
        Imgproc.drawContours(imgOut, contours, -1, new Scalar(0, 0, 255), 2);

        float area = img.width() * img.height();
        Rect rect = Imgproc.boundingRect(mop);
        objList.add(rect);
        Imgproc.rectangle(imgOut, rect.tl(), rect.br(), new Scalar(255, 0, 0));
    }

    Collections.sort(objList, new Comparator<Rect>() {
        @Override
        public int compare(Rect r1, Rect r2) {
            return (int) (r2.area() - r1.area());
        }

    });

    List<Rect> arr = objList;

    while (arr.size() > 0) {
        //System.out.println("---->" + arr);
        Rect bigRect = arr.get(0);
        arr.remove(0);
        Rect bigRect2 = new Rect();

        while (!equals(bigRect, bigRect2)) {
            bigRect2 = bigRect;
            for (int i = 0; i < arr.size(); ++i) {
                // System.out.println("elotte"+arr.get(i));
                if (doOverlap(bigRect, arr.get(i))) {
                    //System.out.println("utana"+arr.get(i));
                    bigRect = union(bigRect, arr.get(i));
                    arr.remove(i);
                    break;
                }
            }

        }

        mainRect = bigRect;

        if (objList.size() > 5 && mainRect.area() >= img.width() * img.height() * 3 / 100) {
            Imgproc.rectangle(imgOut, bigRect.tl(), bigRect.br(), new Scalar(255, 255, 0));
            mainObjects.add(mainRect);
        } else if (objList.size() <= 5) {
            mainObjects.add(mainRect);
        }
    }

}