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LinesDetector8.java
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LinesDetector8.java
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package org.genericsystem.cv;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import javafx.scene.image.ImageView;
import javafx.scene.layout.GridPane;
import org.genericsystem.cv.Calibrated.AngleCalibrated;
import org.genericsystem.cv.lm.LMHostImpl;
import org.genericsystem.cv.utils.NativeLibraryLoader;
import org.genericsystem.cv.utils.Tools;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgproc.Imgproc;
import org.opencv.utils.Converters;
import org.opencv.videoio.VideoCapture;
public class LinesDetector8 extends AbstractApp {
static {
NativeLibraryLoader.load();
}
public static void main(String[] args) {
launch(args);
}
private final VideoCapture capture = new VideoCapture(0);
private ScheduledExecutorService timer = Executors.newSingleThreadScheduledExecutor();
// private Point vp = new Point(0, 0);
private double[] vp = new double[] { 0, 0, 1 };
private AngleCalibrated calibrated;
static final double f = 6.053 / 0.009;
private Mat frame = new Mat();
@Override
protected void fillGrid(GridPane mainGrid) {
capture.read(frame);
ImageView frameView = new ImageView(Tools.mat2jfxImage(frame));
mainGrid.add(frameView, 0, 0);
ImageView deskiewedView = new ImageView(Tools.mat2jfxImage(frame));
mainGrid.add(deskiewedView, 0, 1);
Mat dePerspectived = frame.clone();
// Calibrated.calibrate(frame.width(), frame.height());
double[] pp = new double[] { frame.width() / 2, frame.height() / 2 };
calibrated = new AngleCalibrated(vp, pp, f);
timer.scheduleAtFixedRate(() -> {
try {
capture.read(frame);
Img grad = new Img(frame, false).morphologyEx(Imgproc.MORPH_GRADIENT, Imgproc.MORPH_ELLIPSE, new Size(2, 2)).otsu().morphologyEx(Imgproc.MORPH_CLOSE, Imgproc.MORPH_ELLIPSE, new Size(3, 3));
Lines lines = new Lines(grad.houghLinesP(1, Math.PI / 180, 10, 100, 10));
if (lines.size() > 10) {
lines = lines.reduce(20);
lines.draw(frame, new Scalar(0, 0, 255));
lines = lines.filter(line -> distance(calibrated.getCalibratexyz(), line) < 0.48);
lines.draw(frame, new Scalar(0, 255, 0));
frameView.setImage(Tools.mat2jfxImage(frame));
lines = lines.reduce(10);
double[] newThetaPhi = new LMHostImpl<>((line, params) -> distance(new AngleCalibrated(params).getCalibratexyz(), line), lines.lines, calibrated.getThetaPhi()).getParams();
calibrated = calibrated.dump(newThetaPhi, 1);
vp = calibrated.uncalibrate(pp, f);
System.out.println("Vanishing point : " + Arrays.toString(vp));
Mat homography = findHomography(new Point(vp[0], vp[1]), frame.width(), frame.height());
Imgproc.warpPerspective(frame, dePerspectived, homography, frame.size(), Imgproc.INTER_LINEAR, Core.BORDER_CONSTANT, Scalar.all(0));
deskiewedView.setImage(Tools.mat2jfxImage(dePerspectived));
} else
System.out.println("Not enough lines : " + lines.size());
} catch (Throwable e) {
e.printStackTrace();
}
}, 30, 10, TimeUnit.MILLISECONDS);
}
private double distance(double[] calibratedxyz, Line line) {
double[] lineMat = getLineMat(line);
double di = calibratedxyz[0] * lineMat[0] + calibratedxyz[1] * lineMat[1] + calibratedxyz[2] * lineMat[2];
double normLineMat = Math.sqrt(lineMat[0] * lineMat[0] + lineMat[1] * lineMat[1] + lineMat[2] * lineMat[2]);
di /= (Math.sqrt(calibratedxyz[0] * calibratedxyz[0] + calibratedxyz[1] * calibratedxyz[1] + calibratedxyz[2] * calibratedxyz[2]) * normLineMat);
return di;
}
private double[] getLineMat(Line line) {
double[] pp = new double[] { frame.width() / 2, frame.height() / 2 };
Calibrated calA = new Calibrated(new double[] { line.x1, line.y1, 1d }, pp, f);
Calibrated calB = new Calibrated(new double[] { line.x2, line.y2, 1d }, pp, f);
return cross2D(calA.getCalibratexyz(), calB.getCalibratexyz());
}
static double[] cross2D(double[] a, double b[]) {
return uncalibrate(cross(a, b));
}
static double[] uncalibrate(double[] a) {
return new double[] { a[0] / a[2], a[1] / a[2], 1 };
}
static double[] cross(double[] a, double b[]) {
return new double[] { a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0] };
}
public Point[] rotate(Point bary, double alpha, Point... p) {
Mat matrix = Imgproc.getRotationMatrix2D(bary, alpha / Math.PI * 180, 1);
MatOfPoint2f results = new MatOfPoint2f();
Core.transform(new MatOfPoint2f(p), results, matrix);
return results.toArray();
}
private Mat findHomography(Point vp, double width, double height) {
Point bary = new Point(width / 2, height / 2);
double alpha_ = Math.atan2((vp.y - bary.y), (vp.x - bary.x));
if (alpha_ < -Math.PI / 2 && alpha_ > -Math.PI)
alpha_ = alpha_ + Math.PI;
if (alpha_ < Math.PI && alpha_ > Math.PI / 2)
alpha_ = alpha_ - Math.PI;
double alpha = alpha_;
Point rotatedVp = rotate(bary, alpha, vp)[0];
Point A = new Point(0, 0);
Point B = new Point(width, 0);
Point C = new Point(width, height);
Point D = new Point(0, height);
Point AB2 = new Point(width / 2, 0);
Point CD2 = new Point(width / 2, height);
Point A_, B_, C_, D_;
if (rotatedVp.x >= width / 2) {
A_ = new Line(AB2, rotatedVp).intersection(0);
D_ = new Line(CD2, rotatedVp).intersection(0);
C_ = new Line(A_, bary).intersection(new Line(CD2, rotatedVp));
B_ = new Line(D_, bary).intersection(new Line(AB2, rotatedVp));
} else {
B_ = new Line(AB2, rotatedVp).intersection(width);
C_ = new Line(CD2, rotatedVp).intersection(width);
A_ = new Line(C_, bary).intersection(new Line(AB2, rotatedVp));
D_ = new Line(B_, bary).intersection(new Line(CD2, rotatedVp));
}
// System.out.println("vp : " + vp);
// System.out.println("rotated vp : " + rotatedVp);
// System.out.println("Alpha : " + alpha * 180 / Math.PI);
// System.out.println("A : " + A + " " + A_);
// System.out.println("B : " + B + " " + B_);
// System.out.println("C : " + C + " " + C_);
// System.out.println("D : " + D + " " + D_);
return Imgproc.getPerspectiveTransform(new MatOfPoint2f(rotate(bary, -alpha, A_, B_, C_, D_)), new MatOfPoint2f(A, B, C, D));
}
public static class Lines {
final List<Line> lines;
public Lines(Mat src) {
lines = new ArrayList<>();
for (int i = 0; i < src.rows(); i++) {
double[] val = src.get(i, 0);
Line line = new Line(val[0], val[1], val[2], val[3]);
lines.add(line);
}
}
public Lines filter(Predicate<Line> predicate) {
return new Lines(lines.stream().filter(predicate).collect(Collectors.toList()));
}
public Lines reduce(int max) {
if (lines.size() <= max)
return this;
Set<Line> newLines = new HashSet<>();
while (newLines.size() < max)
newLines.add(lines.get((int) (Math.random() * size())));
return new Lines((newLines));
}
public Lines(Collection<Line> lines) {
this.lines = new ArrayList<>(lines);
}
public Lines rotate(Mat matrix) {
return new Lines(lines.stream().map(line -> line.transform(matrix)).collect(Collectors.toList()));
}
public Lines perspectivTransform(Mat matrix) {
return new Lines(lines.stream().map(line -> line.perspectivTransform(matrix)).collect(Collectors.toList()));
}
public void draw(Mat frame, Scalar color) {
lines.forEach(line -> line.draw(frame, color));
}
public int size() {
return lines.size();
}
}
public static class Line {
final double x1;
final double y1;
final double x2;
final double y2;
public Line(Point p1, Point p2) {
this(p1.x, p1.y, p2.x, p2.y);
}
public Line(double x1, double y1, double x2, double y2) {
this.x1 = x1;
this.x2 = x2;
this.y1 = y1;
this.y2 = y2;
}
public double size() {
return Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2));
}
public Line transform(Mat rotationMatrix) {
MatOfPoint2f results = new MatOfPoint2f();
Core.transform(Converters.vector_Point2f_to_Mat(Arrays.asList(new Point(x1, y1), new Point(x2, y2))), results, rotationMatrix);
Point[] targets = results.toArray();
return new Line(targets[0].x, targets[0].y, targets[1].x, targets[1].y);
}
public Line perspectivTransform(Mat homography) {
MatOfPoint2f results = new MatOfPoint2f();
Core.perspectiveTransform(Converters.vector_Point2f_to_Mat(Arrays.asList(new Point(x1, y1), new Point(x2, y2))), results, homography);
Point[] targets = results.toArray();
return new Line(targets[0].x, targets[0].y, targets[1].x, targets[1].y);
}
public void draw(Mat frame, Scalar color) {
draw(frame, color, 1);
}
public void draw(Mat frame, Scalar color, int thickness) {
Imgproc.line(frame, new Point(x1, y1), new Point(x2, y2), color, thickness);
}
public double geta() {
return (y2 - y1) / (x2 - x1);
}
public double getb() {
return y1 - geta() * x1;
}
public double distance(Point p) {
return Math.abs(geta() * p.x - p.y + getb()) / Math.sqrt(1 + Math.pow(geta(), 2));
}
public Point intersection(double a, double b) {
double x = (b - getb()) / (geta() - a);
double y = a * x + b;
return new Point(x, y);
}
public Point intersection(Line line) {
double x = (line.getb() - getb()) / (geta() - line.geta());
double y = geta() * x + getb();
return new Point(x, y);
}
public Point intersection(double verticalLinex) {
double x = verticalLinex;
double y = geta() * x + getb();
return new Point(x, y);
}
}
@Override
public void stop() throws Exception {
super.stop();
timer.shutdown();
timer.awaitTermination(5000, TimeUnit.MILLISECONDS);
capture.release();
}
}