Examples with Mat org.bytedeco.opencv.opencv_core.Mat used on opensource projects

Example 61 with Mat

use of org.bytedeco.opencv.opencv_core.Mat in project karate by karatelabs.

the class OpenCvUtils method rescale.

public static Mat rescale(Mat mat, double scale) {
    Mat resized = new Mat();
    resize(mat, resized, new Size(), scale, scale, CV_INTER_AREA);
    return resized;
}

Example 62 with Mat

use of org.bytedeco.opencv.opencv_core.Mat in project karate by karatelabs.

the class Tesseract method process.

public void process(Region region, boolean negative) {
    BufferedImage bi = region.captureGreyScale();
    if (region.robot.highlight) {
        region.highlight(region.robot.highlightDuration);
    }
    Mat mat = OpenCvUtils.toMat(bi);
    process(mat, negative);
}

Example 63 with Mat

use of org.bytedeco.opencv.opencv_core.Mat in project qupath by qupath.

the class OpenCVTools method getGaussianDerivKernel.

/**
 * Get filter coefficients for a 1D Gaussian (derivative) kernel.
 *
 * @param sigma Gaussian sigma
 * @param order order of the derivative: 0, ('standard' Gaussian filter), 1 (first derivative) or 2 (second derivative)
 * @param doColumn if true, return coefficients as a column vector rather than a row vector (default)
 * @return
 */
public static Mat getGaussianDerivKernel(double sigma, int order, boolean doColumn) {
    int n = (int) (sigma * 4);
    int len = n * 2 + 1;
    double[] kernel = getGaussianDeriv(sigma, order, len);
    Mat mat;
    if (doColumn)
        mat = new Mat(1, kernel.length, opencv_core.CV_64F);
    else
        mat = new Mat(kernel.length, 1, opencv_core.CV_64F);
    DoubleIndexer indexer = mat.createIndexer();
    indexer.put(0L, kernel);
    indexer.release();
    return mat;
}

Example 64 with Mat

use of org.bytedeco.opencv.opencv_core.Mat in project qupath by qupath.

the class OpenCVTools method splitChannels.

/**
 * Split channels from a {@link Mat}.
 * May be more convenient than OpenCV's built-in approach.
 *
 * @param mat
 * @return a list of {@link Mat}, containing each split channel in order
 */
public static List<Mat> splitChannels(Mat mat) {
    var list = new ArrayList<Mat>();
    var channels = mat.channels();
    for (int c = 0; c < channels; c++) {
        var temp = new Mat();
        opencv_core.extractChannel(mat, temp, c);
        list.add(temp);
    }
    return list;
// This code appeared to give the occasional crazy result (perhaps followed by a segfault?)
// var matvec = new MatVector();
// opencv_core.split(mat, matvec);
// return Arrays.asList(matvec.get());
}

Example 65 with Mat

use of org.bytedeco.opencv.opencv_core.Mat in project qupath by qupath.

the class OpenCVTools method labelsToPoints.

private static List<IndexedPixel> labelsToPoints(Mat mat) {
    if (mat.channels() != 1)
        throw new IllegalArgumentException("labelsToPoints requires a single-channel mat, but input has " + mat.channels() + " channels");
    int w = mat.cols();
    int h = mat.rows();
    var pixels = new ArrayList<IndexedPixel>();
    try (IntIndexer idx = mat.createIndexer()) {
        for (int y = 0; y < h; y++) {
            for (int x = 0; x < w; x++) {
                int lab = idx.get(y, x);
                if (lab != 0) {
                    pixels.add(new IndexedPixel(x, y, lab));
                }
            }
        }
    }
    // Group by label
    var groups = pixels.stream().collect(Collectors.groupingBy(p -> p.value));
    return groups.values().stream().map(l -> closestToCentroid(l)).collect(Collectors.toList());
}