[PhilBot]

Hi

New to Java....

In the Grip generated pipeline code, I want to sort the list of filtered contours to locate the best matches....

Assuming for the moment that I wanted to use area, can anyone show me a code snipit that I can add to the filterContours() method to sort the output array....

Seems like I need to use the Collections.sort() method but I can't get it to accept my arguments.

	/**
	 * Filters out contours that do not meet certain criteria.
	 * @param inputContours is the input list of contours
	 * @param output is the the output list of contours
	 * @param minArea is the minimum area of a contour that will be kept
	 * @param minPerimeter is the minimum perimeter of a contour that will be kept
	 * @param minWidth minimum width of a contour
	 * @param maxWidth maximum width
	 * @param minHeight minimum height
	 * @param maxHeight maximimum height
	 * @param Solidity the minimum and maximum solidity of a contour
	 * @param minVertexCount minimum vertex Count of the contours
	 * @param maxVertexCount maximum vertex Count
	 * @param minRatio minimum ratio of width to height
	 * @param maxRatio maximum ratio of width to height
	 */
	private void filterContours(List<MatOfPoint> inputContours, double minArea,
		double minPerimeter, double minWidth, double maxWidth, double minHeight, double
		maxHeight, double[] solidity, double maxVertexCount, double minVertexCount, double
		minRatio, double maxRatio, List<MatOfPoint> output) {
		final MatOfInt hull = new MatOfInt();
		output.clear();
		
		//operation
		for (int i = 0; i < inputContours.size(); i++) {
			final MatOfPoint contour = inputContours.get(i);
			final Rect bb = Imgproc.boundingRect(contour);
			if (bb.width < minWidth || bb.width > maxWidth) continue;
			if (bb.height < minHeight || bb.height > maxHeight) continue;
			final double area = Imgproc.contourArea(contour);
			if (area < minArea) continue;
			if (Imgproc.arcLength(new MatOfPoint2f(contour.toArray()), true) < minPerimeter) continue;
			Imgproc.convexHull(contour, hull);
			
			// Add new huul
			MatOfPoint mopHull = new MatOfPoint();
			mopHull.create((int) hull.size().height, 1, CvType.CV_32SC2);
			for (int j = 0; j < hull.size().height; j++) {
				int index = (int)hull.get(j, 0)[0];
				double[] point = new double[] { contour.get(index, 0)[0], contour.get(index, 0)[1]};
				mopHull.put(j, 0, point);
			}
			final double solid = 100 * area / Imgproc.contourArea(mopHull);
			if (solid < solidity[0] || solid > solidity[1]) continue;
			if (contour.rows() < minVertexCount || contour.rows() > maxVertexCount)	continue;
			final double ratio = bb.width / (double)bb.height;
			if (ratio < minRatio || ratio > maxRatio) continue;
			
			// Add to main output list
			output.add(contour);
		}

	}