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public FindContour ( |
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| image | A grayscale image. | |
| return | List |
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public void FindPeaksTest()
{
Bitmap hand = Properties.Resources.rhand;
GaussianBlur median = new GaussianBlur(1.1);
median.ApplyInPlace(hand);
// Extract contour
BorderFollowing bf = new BorderFollowing(1);
List<IntPoint> contour = bf.FindContour(hand);
hand = hand.Clone(new Rectangle(0, 0, hand.Width, hand.Height), PixelFormat.Format24bppRgb);
// Find peaks
KCurvature kcurv = new KCurvature(30, new DoubleRange(0, 45));
// kcurv.Suppression = 30;
var peaks = kcurv.FindPeaks(contour);
List<IntPoint> supports = new List<IntPoint>();
for (int i = 0; i < peaks.Count; i++)
{
int j = contour.IndexOf(peaks[i]);
supports.Add(contour[(j + kcurv.K) % contour.Count]);
supports.Add(contour[Accord.Math.Tools.Mod(j - kcurv.K, contour.Count)]);
}
// show(hand, contour, peaks, supports);
Assert.AreEqual(2, peaks.Count);
Assert.AreEqual(46, peaks[0].X);
Assert.AreEqual(0, peaks[0].Y);
Assert.AreEqual(2, peaks[1].X);
Assert.AreEqual(11, peaks[1].Y);
}
/// <summary>
/// Extracts the contour from a single object in a grayscale image. (uses Accord built-in function)
/// </summary>
/// <param name="im">Image.</param>
/// <param name="minGradientStrength">The pixel value threshold above which a pixel
/// is considered black (belonging to the object). Default is zero.</param>
public static List<Point> FindContour(this Gray<byte>[,] im, byte minGradientStrength = 0)
{
BorderFollowing bf = new BorderFollowing(minGradientStrength);
List<Point> points;
using (var uImg = im.Lock())
{
points = bf.FindContour(uImg.AsAForgeImage())
.Select(x => x.ToPoint())
.ToList();
}
return points;
}
public void FindDefectsTest()
{
Bitmap bmp = Properties.Resources.hand;
Bitmap gray = AForge.Imaging.Filters.Grayscale.CommonAlgorithms.BT709.Apply(bmp);
BlobCounter bc = new BlobCounter(gray);
bc.ObjectsOrder = ObjectsOrder.Size;
Blob[] blobs = bc.GetObjectsInformation();
bc.ExtractBlobsImage(bmp, blobs[0], true);
Bitmap blob = blobs[0].Image.ToManagedImage();
BorderFollowing bf = new BorderFollowing();
List<IntPoint> contour = bf.FindContour(blob);
GrahamConvexHull graham = new GrahamConvexHull();
List<IntPoint> hull = graham.FindHull(contour);
ConvexHullDefects hullDefects = new ConvexHullDefects(10);
List<ConvexityDefect> defects = hullDefects.FindDefects(contour, hull);
/* PointsMarker marker = new PointsMarker(hull, Color.Green, 10);
marker.ApplyInPlace(blob);
ImageBox.Show(blob);
*/
Assert.AreEqual(2, defects.Count);
Assert.AreEqual(new IntPoint(130, 10), contour[defects[0].Start]);
Assert.AreEqual(new IntPoint(93, 109), contour[defects[0].Point]);
Assert.AreEqual(new IntPoint(64, 9), contour[defects[0].End]);
Assert.AreEqual(99.549179077148438, defects[0].Depth, 1e-5);
Assert.IsFalse(double.IsNaN(defects[0].Depth));
// Assert.AreEqual(9912.9531239366424, defects[0].Area);
Assert.AreEqual(new IntPoint(49, 18), contour[defects[1].Start]);
Assert.AreEqual(new IntPoint(61, 106), contour[defects[1].Point]);
Assert.AreEqual(new IntPoint(18, 127), contour[defects[1].End]);
Assert.AreEqual(35.615153852366504, defects[1].Depth, 1e-5);
Assert.IsFalse(double.IsNaN(defects[1].Depth));
// Assert.AreEqual(2293.7535682510002, defects[1].Area);
}
public void FindContourTest()
{
Bitmap bmp = Accord.Imaging.Image.Clone(Properties.Resources.sample_black);
Bitmap gray = Grayscale.CommonAlgorithms.BT709.Apply(bmp);
BlobCounter bc = new BlobCounter(gray);
bc.ObjectsOrder = ObjectsOrder.Size;
Blob[] blobs = bc.GetObjectsInformation();
bc.ExtractBlobsImage(bmp, blobs[0], true);
List<IntPoint> expected = bc.GetBlobsEdgePoints(blobs[0]);
Bitmap blob = blobs[0].Image.ToManagedImage();
BorderFollowing bf = new BorderFollowing();
List<IntPoint> actual = bf.FindContour(blob);
Assert.AreEqual(expected.Count, actual.Count);
foreach (IntPoint point in expected)
Assert.IsTrue(actual.Contains(point));
foreach (IntPoint point in actual)
Assert.IsTrue(expected.Contains(point));
IntPoint prev = actual[0];
for (int i = 1; i < actual.Count; i++)
{
IntPoint curr = actual[i];
Assert.IsTrue(System.Math.Abs(prev.X - curr.X) <= 1 &&
System.Math.Abs(prev.Y - curr.Y) <= 1);
prev = curr;
}
IntPoint first = actual[0];
IntPoint last = actual[actual.Count - 1];
Assert.IsTrue(System.Math.Abs(first.X - last.X) <= 1 &&
System.Math.Abs(first.Y - last.Y) <= 1);
}
public void FindContourTest3()
{
Bitmap image = Accord.Imaging.Image.Clone(Properties.Resources.sample_black);
Bitmap grayscaleImage = Grayscale.CommonAlgorithms.BT709.Apply(image);
// Create a new border following algorithm
BorderFollowing borderFollowing = new BorderFollowing();
// Get all points in the contour of the image.
List<IntPoint> contour = borderFollowing.FindContour(grayscaleImage);
// Mark all points in the contour point list in blue
new PointsMarker(contour, Color.Blue).ApplyInPlace(image);
// Show the result
// ImageBox.Show(image);
Assert.AreEqual(380, contour.Count);
}
static void Main(string[] args)
{
Threshold thresh = new Threshold(10);
Median median = new Median(9);
Erosion3x3 erode = new Erosion3x3();
Dilatation3x3 dilate = new Dilatation3x3();
GrahamConvexHull hullFinder = new GrahamConvexHull();
ConnectedComponentsLabeling ccLabeler = new ConnectedComponentsLabeling();
BorderFollowing contourFinder = new BorderFollowing();
GrayscaleToRGB rgb = new GrayscaleToRGB();
ConvexHullDefects defectFinder = new ConvexHullDefects(10);
Bitmap img = (Bitmap)Bitmap.FromFile("hand3.jpg");
Bitmap image = Grayscale.CommonAlgorithms.BT709.Apply(img);
thresh.ApplyInPlace(image);
//median.ApplyInPlace(image);
erode.ApplyInPlace(image);
dilate.ApplyInPlace(image);
BlobCounter counter = new BlobCounter(image);
counter.ObjectsOrder = ObjectsOrder.Area;
Blob[] blobs = counter.GetObjectsInformation();
if (blobs.Length > 0)
{
counter.ExtractBlobsImage(image, blobs[0], true);
UnmanagedImage hand = blobs[0].Image;
var contour = contourFinder.FindContour(hand);
if (contour.Count() > 0)
{
var initialHull = hullFinder.FindHull(contour);
var defects = defectFinder.FindDefects(contour, initialHull);
var filteredHull = initialHull.ClusterHullPoints().FilterLinearHullPoints();
var palmCenter = defects.Centroid(contour);
var wristPoints = filteredHull.SelectWristPoints(defects, contour);
Bitmap color = rgb.Apply(hand).ToManagedImage();
//BitmapData data = color.LockBits(new Rectangle(0, 0, color.Width, color.Height), ImageLockMode.ReadWrite, color.PixelFormat);
//Drawing.Polyline(data, contour, Color.Blue);
//Drawing.Polygon(data, filteredHull, Color.Red);
//color.UnlockBits(data);
Graphics gr = Graphics.FromImage(color);
gr.DrawPolygon(new Pen(Brushes.Red, 3), filteredHull.ToPtArray());
gr.DrawLines(new Pen(Brushes.Blue, 3), contour.ToPtArray());
gr.DrawEllipse(new Pen(Brushes.Red, 3), palmCenter.X - 10, palmCenter.Y - 10, 20, 20);
foreach (ConvexityDefect defect in defects)
{
gr.DrawEllipse(new Pen(Brushes.Green, 6), contour[defect.Point].X - 10, contour[defect.Point].Y - 10, 20, 20);
}
foreach (AForge.IntPoint pt in filteredHull)
{
gr.DrawEllipse(new Pen(Brushes.Yellow, 6), pt.X - 10, pt.Y - 10, 20, 20);
}
foreach (AForge.IntPoint pt in wristPoints)
{
gr.DrawEllipse(new Pen(Brushes.PowderBlue, 6), pt.X - 10, pt.Y - 10, 20, 20);
}
ImageBox.Show(color);
}
}
}
public void FindContourTest2()
{
Bitmap bmp = Properties.Resources.hand2;
BlobCounter bc = new BlobCounter(bmp);
bc.ObjectsOrder = ObjectsOrder.Size;
Blob[] blobs = bc.GetObjectsInformation();
bc.ExtractBlobsImage(bmp, blobs[0], true);
List<IntPoint> expected = bc.GetBlobsEdgePoints(blobs[0]);
Bitmap blob = blobs[0].Image.ToManagedImage();
BorderFollowing bf = new BorderFollowing();
List<IntPoint> actual = bf.FindContour(blob);
foreach (IntPoint point in expected)
Assert.IsTrue(actual.Contains(point));
IntPoint prev = actual[0];
for (int i = 1; i < actual.Count; i++)
{
IntPoint curr = actual[i];
Assert.IsTrue(System.Math.Abs(prev.X - curr.X) <= 1 &&
System.Math.Abs(prev.Y - curr.Y) <= 1);
prev = curr;
}
IntPoint first = actual[0];
IntPoint last = actual[actual.Count - 1];
Assert.IsTrue(System.Math.Abs(first.X - last.X) <= 1 &&
System.Math.Abs(first.Y - last.Y) <= 1);
}
/// <summary>
/// Extracts the contour from a single object in a grayscale image. (uses Accord built-in function)
/// </summary>
/// <param name="im">Image.</param>
/// <param name="minGradientStrength">The pixel value threshold above which a pixel
/// is considered black (belonging to the object). Default is zero.</param>
public static List<Point> FindContour(this Image<Gray, byte> im, byte minGradientStrength = 0)
{
BorderFollowing bf = new BorderFollowing(minGradientStrength);
return bf.FindContour(im.ToAForgeImage(copyAlways: false, failIfCannotCast: true));
}
