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

Example 6 with Scalar

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

the class OpenCVTools method fillSmallHoles.

/**
 * Fill holes in a binary image (1-channel, 8-bit unsigned) with an area <= maxArea.
 *
 * @param matBinary
 * @param maxArea
 */
public static void fillSmallHoles(Mat matBinary, double maxArea) {
    Mat matHoles = new Mat();
    invertBinary(matBinary, matHoles);
    MatVector contours = new MatVector();
    Mat hierarchy = new Mat();
    opencv_imgproc.findContours(matHoles, contours, hierarchy, opencv_imgproc.RETR_CCOMP, opencv_imgproc.CHAIN_APPROX_SIMPLE);
    Scalar color = Scalar.WHITE;
    int ind = 0;
    Point offset = new Point(0, 0);
    Indexer indexerHierarchy = hierarchy.createIndexer();
    for (int c = 0; c < contours.size(); c++) {
        Mat contour = contours.get(c);
        // TODO: Check hierarchy indexing after switch to JavaCPP!!
        if (indexerHierarchy.getDouble(0, ind, 3) >= 0 || opencv_imgproc.contourArea(contour) > maxArea) {
            ind++;
            continue;
        }
        opencv_imgproc.drawContours(matBinary, contours, c, color, -1, opencv_imgproc.LINE_8, null, Integer.MAX_VALUE, offset);
        ind++;
    }
}