CircularityDescriptor.java

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package theba.descriptors;

import theba.core.RegionDescriptor;
import theba.core.RegionMask;

public class CircularityDescriptor implements RegionDescriptor {

        public Object measure(RegionMask vmask) {
                short[] mask = new short[vmask.getWidth() * vmask.getHeight()];
                for (int x = 0; x < vmask.getWidth(); x++)
                        for (int y = 0; y < vmask.getHeight(); y++)
                                if (vmask.isSet(x, y, 0))
                                        mask[x + y * vmask.getWidth()] = 1;
                return measure(mask, vmask.getWidth(), vmask.getHeight());
        }

        public double measure(short[] mask, int w, int h) {
                int count = 0;
                int area = 0;
                for (int x = 0; x < w; x++) {
                        for (int y = 0; y < h; y++) {
                                int index = x + y * w;
                                if (mask[index] != 0) {
                                        area++;
                                        if (x < w - 1 && mask[index + 1] == 0) {
                                                count++;
                                        } else if (x > 1 && mask[index - 1] == 0) {
                                                count++;
                                        } else if (y < h - 1 && mask[index + w] == 0) {
                                                count++;
                                        } else if (y > 0 && mask[index - w] == 0) {
                                                count++;
                                        }
                                }
                        }
                }
                if (area <= 0) {
                        System.err.println("zero area: " + count + " " + area);
                        return 0;
                }
                // double ret = (4 * Math.PI * area / ((double) count * count));
                double ret = (count * count) / (4 * Math.PI * area);
                return ret;
        }

        public String getName() {
                return "Circularity";
        }

        public String getAbout() {
                return null;
        }

        public boolean does3D() {
                return false;
        }

        public boolean isNumeric() {
                return true;
        }
}