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DirectionalFilter.java
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DirectionalFilter.java
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package org.genericsystem.cv.application;
import java.util.ArrayList;
import java.util.List;
import org.genericsystem.cv.utils.NativeLibraryLoader;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgproc.Imgproc;
import org.opencv.videoio.VideoCapture;
public class DirectionalFilter {
static {
NativeLibraryLoader.load();
}
private final double difScl = 0.7;
private final int hSz = (int) Math.ceil(3 * difScl);
private final Mat filterGauss = Mat.zeros(2 * hSz + 1, 1, CvType.CV_64FC1);
private final Mat filterGaussDerivative = Mat.zeros(2 * hSz + 1, 1, CvType.CV_64FC1);
private double u = hSz + 1;
public DirectionalFilter() {
for (int i = 0; i < filterGauss.rows(); i++)
filterGauss.put(i, 0, Math.exp(-Math.pow(i - u, 2) / 2 / Math.pow(difScl, 2) / difScl / Math.sqrt(2 * Math.PI)));
for (int i = 0; i < filterGaussDerivative.rows(); i++)
filterGaussDerivative.put(i, 0, -(i - u) * Math.exp(-Math.pow(i - u, 2) / 2 / Math.pow(difScl, 2) / Math.pow(difScl, 3) / Math.sqrt(2 * Math.PI)));
}
public Mat gx(Mat frame) {
Mat gx = new Mat();
Imgproc.sepFilter2D(frame, gx, CvType.CV_64FC1, filterGauss, filterGaussDerivative);
return gx;
}
public Mat gy(Mat frame) {
Mat gy = new Mat();
Imgproc.sepFilter2D(frame, gy, CvType.CV_64FC1, filterGaussDerivative, filterGauss);
return gy;
}
public Mat bin(Mat ori, int nBin) {
Core.add(ori, new Scalar(-Math.PI), ori);
// for (int row = 0; row < ori.rows(); row++) {
// for (int col = 0; col < ori.cols(); col++) {
// System.out.print(ori.get(row, col)[0] + " ");
// }
// System.out.println();
// }
// System.out.println("--------------------------------------------------------------------");
List<Double> edges = new ArrayList<>();
for (double angle = -Math.PI; angle < Math.PI + 0.000001; angle += 2 * Math.PI / (nBin + 1)) {
edges.add(angle);
}
List<Double> edgesBoundary = new ArrayList<>();
for (int i = 0; i <= nBin; i++) {
edgesBoundary.add((edges.get(i) + edges.get(i + 1)) / 2);
}
Mat binning = Mat.ones(ori.size(), CvType.CV_64FC1);
for (int i = 0; i < nBin - 1; i++) {
Mat filtered = new Mat();
Imgproc.threshold(ori, filtered, edgesBoundary.get(i), 1, Imgproc.THRESH_BINARY);
Core.addWeighted(binning, 1, filtered, 1, 0, binning);
filtered.release();
}
double max = edgesBoundary.get(nBin);
Mat mask = new Mat();
Core.inRange(ori, new Scalar(max), new Scalar(Double.MAX_VALUE), mask);
Mat toCopy = Mat.ones(ori.size(), CvType.CV_64FC1);
toCopy.copyTo(binning, mask);
toCopy.release();
Core.inRange(binning, new Scalar(Integer.valueOf(nBin).doubleValue() / 2), new Scalar(1000), mask);
Core.add(binning, new Scalar(-Integer.valueOf(nBin).doubleValue() / 2), binning, mask);
mask.release();
return binning;
}
public static void main(String[] args) {
VideoCapture vc = new VideoCapture(0);
Mat frame = new Mat();
DirectionalFilter df = new DirectionalFilter();
for (;;) {
vc.read(frame);
Imgproc.cvtColor(frame, frame, Imgproc.COLOR_BGR2GRAY);
frame = df.scale(frame);
Mat gx = df.gx(frame);
Mat gy = df.gy(frame);
Mat mag = new Mat();
Mat ori = new Mat();
Core.cartToPolar(gx, gy, mag, ori);
Mat bin = df.bin(ori, 2 * 64);
Mat histo = df.getHistogram(mag, bin, 64);
double maxValue = Double.MIN_VALUE;
double nbin = Double.MIN_VALUE;
for (int row = 0; row < histo.rows(); row++) {
double value = histo.get(row, 0)[0];
System.out.print((int) value + " ");
if (value > maxValue) {
maxValue = value;
nbin = row;
}
}
System.out.println();
System.out.println("max : " + maxValue);
System.out.println("Result : " + nbin / 64 * 180);
frame.release();
gx.release();
gy.release();
mag.release();
ori.release();
bin.release();
histo.release();
}
}
public Mat getHistogram(Mat mag, Mat binning, int nBin) {
Mat histogram = Mat.zeros(nBin, 1, CvType.CV_64FC1);
for (int i = 1; i <= nBin; i++) {
Mat mask = new Mat();
Core.inRange(binning, new Scalar(i), new Scalar(i), mask);
Mat result = Mat.zeros(binning.size(), CvType.CV_64FC1);
mag.copyTo(result, mask);
double resul = Core.sumElems(result).val[0];
histogram.put(i - 1, 0, resul);
result.release();
mask.release();
}
return histogram;
}
public double getMeanMag(Mat layer) {
Mat gx = gx(layer);
Mat gy = gy(layer);
Mat mag = new Mat();
Core.cartToPolar(gx, gy, mag, new Mat());// original mag is square
return Core.mean(mag).val[0];
}
public Mat scale(Mat img) {
int nScale = 15;
double scaleFactor = 0.8;
Mat[] imgLayers = new Mat[nScale];
imgLayers[0] = img;
Double[] meanMags = new Double[nScale];
for (int i = 0; i < nScale; i++) {
meanMags[i] = getMeanMag(imgLayers[i]);
System.out.println("Mean : " + meanMags[i]);
if (i < nScale - 1) {
imgLayers[i + 1] = new Mat();
Imgproc.resize(imgLayers[i], imgLayers[i + 1], new Size(imgLayers[i].width() * scaleFactor, imgLayers[i].height() * scaleFactor));
}
}
int maxIndex;
for (maxIndex = 1; maxIndex < meanMags.length - 1; maxIndex++) {
if (meanMags[maxIndex] > meanMags[maxIndex - 1] && meanMags[maxIndex] > meanMags[maxIndex + 1])
break;
}
double scale = Math.pow(scaleFactor, maxIndex);
System.out.println("Index : " + maxIndex + " Scale : " + scale);
Mat imgD = new Mat();
Imgproc.resize(img, imgD, new Size(img.width() * scale, img.height() * scale));
return imgD;
}
}