static int[] Cluster(IEnumerable <int> integers, int bandwidth)
{
#if DEBUG
var stopwatch = new Stopwatch();
stopwatch.Start();
#endif
var kernel = new GaussianKernel(1);
var meanshift = new MeanShift(1, kernel, bandwidth);
meanshift.UseParallelProcessing = false;
var points = integers.Select(i => new[] { Convert.ToDouble(i) }).ToArray();
try
{
var labels = meanshift.Compute(points);
}
catch (Exception exception)
{
throw;
}
#if DEBUG
stopwatch.Stop();
Console.WriteLine($"Performed meanshift on {points.Length} points in {stopwatch.ElapsedMilliseconds}ms");
#endif
return(meanshift.Clusters.Modes.Select(m => Convert.ToInt32(m[0])).ToArray());
}
public void meanshift_new_method_no_ctor_args()
{
#region doc_sample1
// Use a fixed seed for reproducibility
Accord.Math.Random.Generator.Seed = 0;
// Declare some data to be clustered
double[][] input =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 2, 1, 1 },
new double[] { 1, 1, 2 },
new double[] { 1, 2, 2 },
new double[] { 3, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
// Create a new Mean-Shift algorithm for 3 dimensional samples
MeanShift meanShift = new MeanShift()
{
// Use a uniform kernel density
Kernel = new UniformKernel(),
Bandwidth = 2.0
};
// Learn a data partitioning using the Mean Shift algorithm
MeanShiftClusterCollection clustering = meanShift.Learn(input);
// Predict group labels for each point
int[] labels = clustering.Decide(input);
// As a result, the first two observations should belong to the
// same cluster (thus having the same label). The same should
// happen to the next four observations and to the last three.
#endregion
Assert.AreEqual(labels[0], labels[1]);
Assert.AreEqual(labels[2], labels[3]);
Assert.AreEqual(labels[2], labels[4]);
Assert.AreEqual(labels[2], labels[5]);
Assert.AreEqual(labels[6], labels[7]);
Assert.AreEqual(labels[6], labels[8]);
Assert.AreNotEqual(labels[0], labels[2]);
Assert.AreNotEqual(labels[2], labels[6]);
Assert.AreNotEqual(labels[0], labels[6]);
int[] labels2 = meanShift.Clusters.Decide(input);
Assert.IsTrue(labels.IsEqual(labels2));
Assert.AreEqual(3 / 9.0, meanShift.Clusters.Proportions[labels[6]], 1e-6);
Assert.AreEqual(2 / 9.0, meanShift.Clusters.Proportions[labels[0]], 1e-6);
Assert.AreEqual(4 / 9.0, meanShift.Clusters.Proportions[labels[2]], 1e-6);
}
public static List <List <Vector2> > ClusterPoints(List <Vector2> points)//delete "outliers"
{
double[][] input = new double[points.Count][];
for (int i = 0; i < points.Count; i++)
{
input[i] = new double[] { points[i].x, points[i].y };
}
UniformKernel kernel = new UniformKernel();
MeanShift meanShift = new MeanShift(dimension: 2, kernel: kernel, bandwidth: 1e-2);
MeanShiftClusterCollection clustering = meanShift.Learn(input);
int[] labels = clustering.Decide(input);
List <List <Vector2> > classedPoints = new List <List <Vector2> >();
for (int i = 0; i <= Mathf.Max(labels); i++)
{
List <Vector2> iClass = new List <Vector2>();
foreach (var p in points)
{
iClass.Add(p);
}
classedPoints.Add(iClass);
}
return(classedPoints);
}
public void MeanShiftConstructorTest2()
{
Accord.Math.Tools.SetupGenerator(1);
// Declare some observations
double[][] observations =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 2, 1, 1 },
new double[] { 1, 1, 2 },
new double[] { 1, 2, 2 },
new double[] { 3, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
double[][] orig = observations.MemberwiseClone();
// Create a uniform kernel density function
UniformKernel kernel = new UniformKernel();
// Create a new Mean-Shift algorithm for 3 dimensional samples
MeanShift meanShift = new MeanShift(dimension: 3, kernel: kernel, bandwidth: 2);
// Compute the algorithm, retrieving an integer array
// containing the labels for each of the observations
int[] labels = meanShift.Compute(observations);
// As a result, the first two observations should belong to the
// same cluster (thus having the same label). The same should
// happen to the next four observations and to the last three.
Assert.AreEqual(labels[0], labels[1]);
Assert.AreEqual(labels[2], labels[3]);
Assert.AreEqual(labels[2], labels[4]);
Assert.AreEqual(labels[2], labels[5]);
Assert.AreEqual(labels[6], labels[7]);
Assert.AreEqual(labels[6], labels[8]);
Assert.AreNotEqual(labels[0], labels[2]);
Assert.AreNotEqual(labels[2], labels[6]);
Assert.AreNotEqual(labels[0], labels[6]);
int[] labels2 = meanShift.Clusters.Decide(observations);
Assert.IsTrue(labels.IsEqual(labels2));
// the data must not have changed!
Assert.IsTrue(orig.IsEqual(observations));
Assert.AreEqual(3 / 9.0, meanShift.Clusters.Proportions[labels[6]], 1e-6);
Assert.AreEqual(2 / 9.0, meanShift.Clusters.Proportions[labels[0]], 1e-6);
Assert.AreEqual(4 / 9.0, meanShift.Clusters.Proportions[labels[2]], 1e-6);
}
public void YinYangMeanShiftTest()
{
Accord.Math.Random.Generator.Seed = 1;
double[][] inputs = yinyang.Submatrix(null, 0, 1).ToJagged();
int[] outputs = yinyang.GetColumn(2).ToInt32();
MeanShift ms = new MeanShift(2, new GaussianKernel(dimension: 2), 0.55);
int[] labels = ms.Compute(inputs);
}
public void MeanShiftConstructorTest()
{
Accord.Math.Tools.SetupGenerator(0);
// Test Samples
double[][] samples =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 7 },
new double[] { 1, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
new double[] { 5, 1 }
};
var kernel = new GaussianKernel(dimension: 2);
MeanShift meanShift = new MeanShift(2, kernel, 3);
// Compute the model (estimate)
int[] labels = meanShift.Compute(samples);
int a = 0;
int b = 1;
if (0.2358896594197982.IsRelativelyEqual(meanShift.Clusters.Modes[1][0], 1e-10))
{
a = 1;
b = 0;
}
for (int i = 0; i < 5; i++)
{
Assert.AreEqual(a, labels[i]);
}
for (int i = 5; i < samples.Length; i++)
{
Assert.AreEqual(b, labels[i]);
}
Assert.AreEqual(0.2358896594197982, meanShift.Clusters.Modes[a][0], 1e-10);
Assert.AreEqual(1.0010865560750339, meanShift.Clusters.Modes[a][1], 1e-10);
Assert.AreEqual(6.7284908155626031, meanShift.Clusters.Modes[b][0], 1e-10);
Assert.AreEqual(1.2713970467590967, meanShift.Clusters.Modes[b][1], 1e-10);
Assert.AreEqual(2, meanShift.Clusters.Count);
Assert.AreEqual(2, meanShift.Clusters.Modes.Length);
}
public void MeanShiftConstructorTest()
{
Accord.Math.Random.Generator.Seed = 0;
// Test Samples
double[][] samples =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 7 },
new double[] { 1, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
new double[] { 5, 1 }
};
var kernel = new GaussianKernel(dimension: 2);
MeanShift meanShift = new MeanShift(2, kernel, 2.0);
meanShift.UseParallelProcessing = false;
// Compute the model (estimate)
int[] labels = meanShift.Compute(samples);
int a = labels[0];
int b = (a == 0) ? 1 : 0;
for (int i = 0; i < 5; i++)
{
Assert.AreEqual(a, labels[i]);
}
for (int i = 5; i < samples.Length; i++)
{
Assert.AreEqual(b, labels[i]);
}
Assert.AreEqual(1.1922811512028066, meanShift.Clusters.Modes[a][0], 1e-3);
Assert.AreEqual(1.2567196159235963, meanShift.Clusters.Modes[a][1], 1e-3);
Assert.AreEqual(5.2696337859175868, meanShift.Clusters.Modes[b][0], 1e-3);
Assert.AreEqual(1.4380326532534968, meanShift.Clusters.Modes[b][1], 1e-3);
Assert.AreEqual(2, meanShift.Clusters.Count);
Assert.AreEqual(2, meanShift.Clusters.Modes.Length);
Assert.AreEqual(0.5, meanShift.Clusters.Proportions[0]);
Assert.AreEqual(0.5, meanShift.Clusters.Proportions[1]);
}
public override void Resolve(double[] weightedColors, int startIndex, int colorsAmount, byte componentsAmount, double k,
double[] resultColor, int resultIndex)
{
var els = componentsAmount + 1;
var offs = startIndex * els;
var colors = weightedColors
.Skip(offs)
.Take(colorsAmount * els)
.ToArray();
var observations = new double[colorsAmount][];
for (int colorIndex = 0; colorIndex < colorsAmount; colorIndex++)
{
var weightedColor = new double[els];
observations[colorIndex] = weightedColor;
for (int i = 0; i < els; i++)
{
weightedColor[i] = weightedColors[offs + colorIndex * els + i];
}
}
// Create a uniform kernel density function
UniformKernel kernel = new UniformKernel();
//calculate sigma
double sigma = CalculateSigma(colors, (byte)(componentsAmount + 1));
//calc bandwidth
double bandwidth = k * sigma;
// Create a new Mean-Shift algorithm for 4 dimensional samples
MeanShift meanShift = new MeanShift(kernel: kernel, bandwidth: bandwidth);
// Compute the algorithm, retrieving an integer array
// containing the labels for each of the observations
int[] labels = meanShift.Compute(observations);
var mostCommonColor = labels
.GroupBy(item => item)
.OrderByDescending(gg => gg.Count())
.Select(gg => gg.Key)
.First();
var labeledWeightedColors = labels
.Where(l => l == mostCommonColor)
.SelectMany((label, index) => observations[index])
.ToArray();
_colorResolver.Resolve(labeledWeightedColors, 0, labeledWeightedColors.Length / els, componentsAmount, k, resultColor, resultIndex);
}
private object calcMeanShift(IPixelBlock3 vPb, IPixelBlock3 pb3)
{
double[][] jaArr = pixelBlockToJaggedArray(vPb);
int bands = vPb.Planes;
UniformKernel kernel = new UniformKernel();
//GaussianKernel kernel = new GaussianKernel(bands);
MeanShift ms = new MeanShift(bands, kernel, radius);
int[] vls = ms.Compute(jaArr, 0.05, 10);
NumClusters = ms.Clusters.Count;
Console.WriteLine(NumClusters);
return(splitArray(vls, pb3));
}
public void MeanShiftConstructorTest()
{
Accord.Math.Tools.SetupGenerator(0);
// Test Samples
double[][] samples =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 7 },
new double[] { 1, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
new double[] { 5, 1 }
};
var kernel = new GaussianKernel(dimension: 2);
MeanShift meanShift = new MeanShift(2, kernel, 3);
// Compute the model (estimate)
int[] labels = meanShift.Compute(samples);
int a = 0;
int b = 1;
if (0.2358896594197982.IsRelativelyEqual(meanShift.Clusters.Modes[1][0], 1e-10))
{
a = 1;
b = 0;
}
for (int i = 0; i < 5; i++)
Assert.AreEqual(a, labels[i]);
for (int i = 5; i < samples.Length; i++)
Assert.AreEqual(b, labels[i]);
Assert.AreEqual(0.2358896594197982, meanShift.Clusters.Modes[a][0], 1e-10);
Assert.AreEqual(1.0010865560750339, meanShift.Clusters.Modes[a][1], 1e-10);
Assert.AreEqual(6.7284908155626031, meanShift.Clusters.Modes[b][0], 1e-10);
Assert.AreEqual(1.2713970467590967, meanShift.Clusters.Modes[b][1], 1e-10);
Assert.AreEqual(2, meanShift.Clusters.Count);
Assert.AreEqual(2, meanShift.Clusters.Modes.Length);
}
public void meanShift()
{
string basePath = Path.Combine(NUnit.Framework.TestContext.CurrentContext.TestDirectory, "kmeans");
Directory.CreateDirectory(basePath);
#region doc_meanshift
// Load a test image (shown in a picture box below)
var sampleImages = new TestImages(path: basePath);
Bitmap image = sampleImages.GetImage("airplane.png");
// ImageBox.Show("Original", image).Hold();
// Create converters to convert between Bitmap images and double[] arrays
var imageToArray = new ImageToArray(min: -1, max: +1);
var arrayToImage = new ArrayToImage(image.Width, image.Height, min: -1, max: +1);
// Transform the image into an array of pixel values
double[][] pixels; imageToArray.Convert(image, out pixels);
// Create a MeanShift algorithm using given bandwidth
// and a Gaussian density kernel as kernel function.
MeanShift meanShift = new MeanShift()
{
Kernel = new GaussianKernel(3),
Bandwidth = 0.06,
// We will compute the mean-shift algorithm until the means
// change less than 0.05 between two iterations of the algorithm
Tolerance = 0.05,
MaxIterations = 10
};
// Learn the clusters from the data
var clusters = meanShift.Learn(pixels);
// Use clusters to decide class labels
int[] labels = clusters.Decide(pixels);
// Replace every pixel with its corresponding centroid
double[][] replaced = pixels.Apply((x, i) => clusters.Modes[labels[i]]);
// Retrieve the resulting image (shown in a picture box)
Bitmap result; arrayToImage.Convert(replaced, out result);
// ImageBox.Show("Mean-Shift clustering", result).Hold();
#endregion
}
public void MeanShiftConstructorTest()
{
Accord.Math.Random.Generator.Seed = 0;
// Test Samples
double[][] samples =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 7 },
new double[] { 1, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
new double[] { 5, 1 }
};
var kernel = new GaussianKernel(dimension: 2);
MeanShift meanShift = new MeanShift(2, kernel, 2.0);
meanShift.UseParallelProcessing = false;
// Compute the model (estimate)
int[] labels = meanShift.Compute(samples);
int a = labels[0];
int b = (a == 0) ? 1 : 0;
for (int i = 0; i < 5; i++)
Assert.AreEqual(a, labels[i]);
for (int i = 5; i < samples.Length; i++)
Assert.AreEqual(b, labels[i]);
Assert.AreEqual(1.1922811512028066, meanShift.Clusters.Modes[a][0], 1e-3);
Assert.AreEqual(1.2567196159235963, meanShift.Clusters.Modes[a][1], 1e-3);
Assert.AreEqual(5.2696337859175868, meanShift.Clusters.Modes[b][0], 1e-3);
Assert.AreEqual(1.4380326532534968, meanShift.Clusters.Modes[b][1], 1e-3);
Assert.AreEqual(2, meanShift.Clusters.Count);
Assert.AreEqual(2, meanShift.Clusters.Modes.Length);
Assert.AreEqual(0.5, meanShift.Clusters.Proportions[0]);
Assert.AreEqual(0.5, meanShift.Clusters.Proportions[1]);
}
public void WriteXml(XmlWriter writer)
{
writer.WriteAttributeString("name", Name);
writer.WriteAttributeString("desc1", Description1);
writer.WriteAttributeString("desc2", Description2);
writer.WriteAttributeString("partName", PartName);
writer.WriteAttributeString("featureName", FeatureName);
writer.WriteAttributeString("toleranceValue", ToleranceValue.ToString(CultureInfo.InvariantCulture));
writer.WriteAttributeString("toleranceEffective",
ToleranceEffective.ToString(CultureInfo.InvariantCulture));
writer.WriteAttributeString("effect", Effect.ToString(CultureInfo.InvariantCulture));
writer.WriteAttributeString("sensitivity", Sensitivity.ToString(CultureInfo.InvariantCulture));
writer.WriteAttributeString("meanShift", MeanShift.ToString(CultureInfo.InvariantCulture));
writer.WriteAttributeString("src", Src);
writer.WriteAttributeString("weight", Weight.ToString(CultureInfo.InvariantCulture));
}
/// <summary>
/// Runs the Mean-Shift algorithm.
/// </summary>
///
private void runMeanShift()
{
int pixelSize = 3;
// Retrieve the kernel bandwidth
double sigma = (double)numBandwidth.Value;
// Load original image
Bitmap image = Properties.Resources.leaf;
// Create converters
ImageToArray imageToArray = new ImageToArray(min: -1, max: +1);
ArrayToImage arrayToImage = new ArrayToImage(image.Width, image.Height, min: -1, max: +1);
// Transform the image into an array of pixel values
double[][] pixels; imageToArray.Convert(image, out pixels);
// Create a MeanShift algorithm using the given bandwidth
// and a Gaussian density kernel as the kernel function:
IRadiallySymmetricKernel kernel = new GaussianKernel(pixelSize);
var meanShift = new MeanShift(pixelSize, kernel, sigma)
{
Tolerance = 0.05,
MaxIterations = 10
};
// Compute the mean-shift algorithm until the difference
// in shift vectors between two iterations is below 0.05
int[] idx = meanShift.Compute(pixels);
// Replace every pixel with its corresponding centroid
pixels.ApplyInPlace((x, i) => meanShift.Clusters.Modes[idx[i]]);
// Show resulting image in the picture box
Bitmap result; arrayToImage.Convert(pixels, out result);
pictureBox.Image = result;
}
private static void meanShift(double[][] inputs)
{
// Create a mean-shfit algorithm
var kmeans = new MeanShift()
{
Bandwidth = 0.1,
Kernel = new EpanechnikovKernel(),
Distance = new Euclidean(),
MaxIterations = 1000
};
// Use it to learn a data model
var model = kmeans.Learn(inputs);
// Use the model to group new instances
int[] prediction = model.Decide(inputs);
// Plot the results
ScatterplotBox.Show("Mean-Shift's answer", inputs, prediction).Hold();
}
static void TestMeanShift()
{
Bitmap image = Accord.Imaging.Image.FromUrl("https://c1.staticflickr.com/4/3209/2527630511_fae07530c2_b.jpg");
//ImageBox.Show("Original", image).Hold();
// Create converters to convert between Bitmap images and double[] arrays
var imageToArray = new ImageToArray(min: -1, max: +1);
var arrayToImage = new ArrayToImage(image.Width, image.Height, min: -1, max: +1);
// Transform the image into an array of pixel values
double[][] pixels; imageToArray.Convert(image, out pixels);
// Create a MeanShift algorithm using given bandwidth
// and a Gaussian density kernel as kernel function.
MeanShift meanShift = new MeanShift()
{
Kernel = new EpanechnikovKernel(),
Bandwidth = 0.1,
// We will compute the mean-shift algorithm until the means
// change less than 0.05 between two iterations of the algorithm
Tolerance = 0.05,
MaxIterations = 10
};
// Learn the clusters from the data
var clusters = meanShift.Learn(pixels);
// Use clusters to decide class labels
int[] labels = clusters.Decide(pixels);
// Replace every pixel with its corresponding centroid
double[][] replaced = pixels.Apply((x, i) => clusters.Modes[labels[i]]);
// Retrieve the resulting image (shown in a picture box)
Bitmap result; arrayToImage.Convert(replaced, out result);
//ImageBox.Show("Mean-Shift clustering", result).Hold();
}
public override void Initialize()
{
SetStartDate(2016, 1, 1);
SetEndDate(2016, 7, 1);
SetCash(10000);
AddSecurity(SecurityType.Equity, symbol, Resolution.Hour);
var tradeBarHistory = History <TradeBar>(symbol, TimeSpan.FromDays(7), Resolution.Hour);
// we can loop over the return value from these functions and we get TradeBars
// we can use these TradeBars to initialize indicators or perform other math
var closes = new double[][] { tradeBarHistory.Select((tb) => tb.Close).ToDoubleArray() };
IRadiallySymmetricKernel kernel = new GaussianKernel(1);
var meanShift = new MeanShift(kernel, 1)
{
//Tolerance = 0.05,
//MaxIterations = 10
};
// Compute the mean-shift algorithm until the difference
// in shift vectors between two iterations is below 0.05
int[] idx = meanShift.Learn(closes).Decide(closes);
// Replace every pixel with its corresponding centroid
result = closes.Apply((x, i) => meanShift.Clusters.Modes[idx[i]], result: closes);
foreach (var rr in result)
{
foreach (var r in rr)
{
Debug("" + r);
}
}
}
public void TestClusterOrder()
{
// set of points with 4 obvious clusters
double[][] points =
{
// plus,minus points
new double[] { 11, -10 },
new double[] { 11, -12 },
new double[] { 10, -13 },
// plus,plus points
new double[] { 10, 10 },
new double[] { 11, 13 },
new double[] { 10, 12 },
new double[] { 11, 10 },
// minus,plus points
new double[] { -10, 10 },
new double[] { -10, 11 },
new double[] { -11, 10 },
new double[] { -11, 11 },
// minus,minus points
new double[] { -10, -10 },
new double[] { -11.5, -10 },
new double[] { -13, -10 }
};
// for use in tests, count points in each cluster
double minusMinusPointCount = 0;
double minusPlusPointCount = 0;
double plusMinusPointCount = 0;
double plusPlusPointCount = 0;
for (int i = 0; i < points.Length; ++i)
{
if (points[i][0] < 0 && points[i][1] < 0)
{
minusMinusPointCount += 1;
}
else if (points[i][0] < 0 && points[i][1] > 0)
{
minusPlusPointCount += 1;
}
else if (points[i][0] > 0 && points[i][1] < 0)
{
plusMinusPointCount += 1;
}
else if (points[i][0] > 0 && points[i][1] > 0)
{
plusPlusPointCount += 1;
}
}
// MeanShift calculations
Accord.Math.Random.Generator.Seed = 1;
var meanShift = new MeanShift()
{
// Use a uniform kernel density
Kernel = new Accord.Statistics.Distributions.DensityKernels.GaussianKernel(2),
Bandwidth = 2
};
meanShift.UseParallelProcessing = false;
var clustering = meanShift.Learn(points);
int[] labels = clustering.Decide(points);
// Test results
// we should get 4 clusters
Assert.True(clustering.Count == 4);
// proportions of clusters should match, and point labels should assign them to modes
// that make sense
for (int i = 0; i < clustering.Count; ++i)
{
if (clustering.Modes[i][0] < 0 && clustering.Modes[i][1] < 0)
{
Assert.Equal(clustering.Proportions[i], minusMinusPointCount / points.Length, 5);
for (int j = 0; j < points.Length; ++j)
{
if (labels[j] == i)
{
Assert.True(points[j][0] < 0 && points[j][1] < 0);
}
}
}
if (clustering.Modes[i][0] < 0 && clustering.Modes[i][1] > 0)
{
Assert.Equal(clustering.Proportions[i], minusPlusPointCount / points.Length, 5);
for (int j = 0; j < points.Length; ++j)
{
if (labels[j] == i)
{
Assert.True(points[j][0] < 0 && points[j][1] > 0);
}
}
}
if (clustering.Modes[i][0] > 0 && clustering.Modes[i][1] < 0)
{
Assert.Equal(clustering.Proportions[i], plusMinusPointCount / points.Length, 5);
for (int j = 0; j < points.Length; ++j)
{
if (labels[j] == i)
{
Assert.True(points[j][0] > 0 && points[j][1] < 0);
}
}
}
if (clustering.Modes[i][0] > 0 && clustering.Modes[i][1] > 0)
{
Assert.Equal(clustering.Proportions[i], plusPlusPointCount / points.Length, 5);
for (int j = 0; j < points.Length; ++j)
{
if (labels[j] == i)
{
Assert.True(points[j][0] > 0 && points[j][1] > 0);
}
}
}
}
}
public void WeightedMeanShiftConstructorTest()
{
MeanShift ms1, ms2, ms3;
Accord.Math.Tools.SetupGenerator(0);
double[][] samples1 =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 1 },
new double[] { 1, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
new double[] { 5, 1 }
};
int[] weights1 = Vector.Ones <int>(samples1.Length);
ms1 = new MeanShift(2, new GaussianKernel(dimension: 2), 2.0);
ms1.Compute(samples1);
Accord.Math.Tools.SetupGenerator(0);
double[][] samples2 =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
};
int[] weights = { 1, 1, 2, 1, 1, 1, 2, 1 };
ms2 = new MeanShift(2, new GaussianKernel(dimension: 2), 2.0);
ms2.Compute(samples2, weights);
ms3 = new MeanShift(2, new GaussianKernel(dimension: 2), 2.0);
ms3.Compute(samples2);
int[] labels1 = ms1.Clusters.Decide(samples1);
int[] labels2 = ms2.Clusters.Decide(samples1);
int[] labels3 = ms3.Clusters.Decide(samples1);
Assert.IsTrue(Matrix.IsEqual(labels1, labels2));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Modes, ms2.Clusters.Modes, 1e-3));
Assert.IsFalse(Matrix.IsEqual(ms1.Clusters.Modes, ms3.Clusters.Modes, 1e-2));
Assert.IsFalse(Matrix.IsEqual(ms2.Clusters.Modes, ms3.Clusters.Modes, 1e-2));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms2.Clusters.Proportions));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms3.Clusters.Proportions));
Assert.AreEqual(0.5, ms1.Clusters.Proportions[0]);
Assert.AreEqual(0.5, ms1.Clusters.Proportions[1]);
}
/// <summary>
/// Runs the Mean-Shift algorithm.
/// </summary>
///
private void runMeanShift()
{
int pixelSize = 3;
// Retrieve the kernel bandwidth
double sigma = (double)numBandwidth.Value;
// Load original image
Bitmap image = Properties.Resources.leaf;
// Create converters
ImageToArray imageToArray = new ImageToArray(min: -1, max: +1);
ArrayToImage arrayToImage = new ArrayToImage(image.Width, image.Height, min: -1, max: +1);
// Transform the image into an array of pixel values
double[][] pixels; imageToArray.Convert(image, out pixels);
// Create a MeanShift algorithm using the given bandwidth
// and a Gaussian density kernel as the kernel function:
IRadiallySymmetricKernel kernel = new GaussianKernel(pixelSize);
var meanShift = new MeanShift(pixelSize, kernel, sigma)
{
Tolerance = 0.05,
MaxIterations = 10
};
// Compute the mean-shift algorithm until the difference
// in shift vectors between two iterations is below 0.05
int[] idx = meanShift.Compute(pixels);
// Replace every pixel with its corresponding centroid
pixels.ApplyInPlace((x, i) => meanShift.Clusters.Modes[idx[i]]);
// Show resulting image in the picture box
Bitmap result; arrayToImage.Convert(pixels, out result);
pictureBox.Image = result;
}
public void WeightedMeanShiftConstructorTest()
{
MeanShift ms1, ms2, ms3;
Accord.Math.Tools.SetupGenerator(0);
double[][] samples1 =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 1 },
new double[] { 1, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
new double[] { 5, 1 }
};
int[] weights1 = Vector.Ones<int>(samples1.Length);
ms1 = new MeanShift(2, new GaussianKernel(dimension: 2), 2.0);
ms1.Compute(samples1);
Accord.Math.Tools.SetupGenerator(0);
double[][] samples2 =
{
new double[] { 0, 1 },
new double[] { 1, 2 },
new double[] { 1, 1 },
new double[] { 0, 1 },
new double[] { 6, 2 },
new double[] { 6, 5 },
new double[] { 5, 1 },
new double[] { 7, 1 },
};
int[] weights = { 1, 1, 2, 1, 1, 1, 2, 1 };
ms2 = new MeanShift(2, new GaussianKernel(dimension: 2), 2.0);
ms2.Compute(samples2, weights);
ms3 = new MeanShift(2, new GaussianKernel(dimension: 2), 2.0);
ms3.Compute(samples2);
int[] labels1 = ms1.Clusters.Nearest(samples1);
int[] labels2 = ms2.Clusters.Nearest(samples1);
int[] labels3 = ms3.Clusters.Nearest(samples1);
Assert.IsTrue(Matrix.IsEqual(labels1, labels2));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Modes, ms2.Clusters.Modes, 1e-3));
Assert.IsFalse(Matrix.IsEqual(ms1.Clusters.Modes, ms3.Clusters.Modes, 1e-2));
Assert.IsFalse(Matrix.IsEqual(ms2.Clusters.Modes, ms3.Clusters.Modes, 1e-2));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms2.Clusters.Proportions));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms3.Clusters.Proportions));
Assert.AreEqual(0.5, ms1.Clusters.Proportions[0]);
Assert.AreEqual(0.5, ms1.Clusters.Proportions[1]);
}
public void MeanShiftConstructorTest2()
{
Accord.Math.Tools.SetupGenerator(1);
// Declare some observations
double[][] observations =
{
new double[] { -5, -2, -1 },
new double[] { -5, -5, -6 },
new double[] { 2, 1, 1 },
new double[] { 1, 1, 2 },
new double[] { 1, 2, 2 },
new double[] { 3, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
double[][] orig = observations.MemberwiseClone();
// Create a uniform kernel density function
UniformKernel kernel = new UniformKernel();
// Create a new Mean-Shift algorithm for 3 dimensional samples
MeanShift meanShift = new MeanShift(dimension: 3, kernel: kernel, bandwidth: 1.5 );
// Compute the algorithm, retrieving an integer array
// containing the labels for each of the observations
int[] labels = meanShift.Compute(observations);
// As a result, the first two observations should belong to the
// same cluster (thus having the same label). The same should
// happen to the next four observations and to the last three.
Assert.AreEqual(labels[0], labels[1]);
Assert.AreEqual(labels[2], labels[3]);
Assert.AreEqual(labels[2], labels[4]);
Assert.AreEqual(labels[2], labels[5]);
Assert.AreEqual(labels[6], labels[7]);
Assert.AreEqual(labels[6], labels[8]);
Assert.AreNotEqual(labels[0], labels[2]);
Assert.AreNotEqual(labels[2], labels[6]);
Assert.AreNotEqual(labels[0], labels[6]);
int[] labels2 = meanShift.Clusters.Nearest(observations);
Assert.IsTrue(labels.IsEqual(labels2));
// the data must not have changed!
Assert.IsTrue(orig.IsEqual(observations));
}
public void RunProcess(double[][] inputDataMS, bool displayResult = false)
{
Stopwatch sw = new Stopwatch();
sw.Start();
MeanShift clusterMS = new MeanShift(dataDimension, new UniformKernel(), msSearchRadius);
clusterMS.Distance = new myDistanceClass();
MeanShiftClusterCollection clustering = clusterMS.Learn(inputDataMS);
pointLabels = clustering.Decide(inputDataMS);
clusteringPlaneRec = new List <pointPlaneClass>();
for (int i = 0; i < clustering.Count; i++)
{
clusteringPlaneRec.Add(new pointPlaneClass(i, 0));
}
for (int i = 0; i < h * w; i++)
{
MyVector3 vector3T = new MyVector3(inputDataMS[i][6], inputDataMS[i][7], inputDataMS[i][8]);
if (vector3T.x == 0 && vector3T.y == 0 && vector3T.z == 0)
{
continue;
}
int idx = pointLabels[i];
clusteringPlaneRec[idx].Points.Add(vector3T);
clusteringPlaneRec[idx].PointsIdx.Add(i);
clusteringPlaneRec[idx].Value++;
}
clusteringPlaneRec.Sort((x, y) => y.Value.CompareTo(x.Value));
#region visualization
if (displayResult)
{
int loop = 0;
Image <Bgr, byte> image2 = new Image <Bgr, byte>(w, h);
image2.SetZero();
for (int i = 0; i < h; i++)
{
for (int j = 0; j < w; j++)
{
if (pointLabels[loop] >= 0)
{
byte r = (byte)(Utils.ColorMall[pointLabels[loop] % 30].R);
byte g = (byte)(Utils.ColorMall[pointLabels[loop] % 30].G);
byte b = (byte)(Utils.ColorMall[pointLabels[loop] % 30].B);
image2[i, j] = new Bgr(b, g, r);
}
loop++;
}
}
new ImageViewer(image2, "2 - MeanShiftClustering").Show();
}
#endregion
sw.Stop();
Console.WriteLine(clusteringPlaneRec.Count + " labels\tin" + sw.ElapsedMilliseconds / 1000 + "s");
sw.Restart();
// extract planes from clustered data
SceondPlaneExtraction();
#region visualization
if (displayResult)
{
int loop = 0;
Image <Bgr, byte> image3 = new Image <Bgr, byte>(w, h);
image3.SetZero();
for (int i = 0; i < h; i++)
{
for (int j = 0; j < w; j++)
{
if (pointLabels[loop] >= 0)
{
byte r = (byte)(Utils.ColorMall[pointLabels[loop] % 30].R);
byte g = (byte)(Utils.ColorMall[pointLabels[loop] % 30].G);
byte b = (byte)(Utils.ColorMall[pointLabels[loop] % 30].B);
image3[i, j] = new Bgr(b, g, r);
}
loop++;
}
}
new ImageViewer(image3, "3 - PlaneExtraction").Show();
}
#endregion
sw.Stop();
Console.WriteLine(extractionPlaneRec.Count + " labels\tin" + sw.ElapsedMilliseconds / 1000 + "s");
sw.Restart();
// merge planes if necessary
MergePlanes();
#region visualization
if (displayResult)
{
int loop = 0;
Image <Bgr, byte> image4 = new Image <Bgr, byte>(w, h);
image4.SetZero();
for (int i = 0; i < h; i++)
{
for (int j = 0; j < w; j++)
{
if (pointLabels[loop] >= 0)
{
byte r = (byte)(Utils.ColorMall[pointLabels[loop] % 30].R);
byte g = (byte)(Utils.ColorMall[pointLabels[loop] % 30].G);
byte b = (byte)(Utils.ColorMall[pointLabels[loop] % 30].B);
image4[i, j] = new Bgr(b, g, r);
}
loop++;
}
}
new ImageViewer(image4, "4 - MergedPlanes").Show();
}
#endregion
sw.Stop();
Console.WriteLine(mergedPlaneRec.Count + " labels\tin" + sw.ElapsedMilliseconds / 1000 + "s");
}
public void WeightedMeanShiftConstructorTest2()
{
Accord.Math.Tools.SetupGenerator(1);
// Declare some observations
double[][] observations1 =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 1, 1, 2 },
new double[] { 1, 1, 2 },
new double[] { 1, 1, 2 },
new double[] { 1, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
int[] weights1 = { 1, 1, 1, 1, 1, 1, 1, 1, 1 };
// Declare some observations
double[][] observations2 =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 1, 1, 2 },
// new double[] { 1, 1, 2 },
// new double[] { 1, 1, 2 },
// new double[] { 1, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
int[] weights2 = { 1, 1, 4, 1, 1, 1 };
Accord.Math.Random.Generator.Seed = 1;
var ms1 = new MeanShift(dimension: 3, kernel: new UniformKernel(), bandwidth: 2);
ms1.UseParallelProcessing = false;
ms1.Compute(observations1);
Accord.Math.Random.Generator.Seed = 1;
var ms2 = new MeanShift(dimension: 3, kernel: new UniformKernel(), bandwidth: 2);
ms2.UseParallelProcessing = false;
ms2.Compute(observations1, weights1);
Accord.Math.Random.Generator.Seed = 1;
var ms3 = new MeanShift(dimension: 3, kernel: new UniformKernel(), bandwidth: 2);
ms3.UseParallelProcessing = false;
ms3.Compute(observations2, weights2);
int[] labels1 = ms1.Clusters.Decide(observations1);
int[] labels2 = ms2.Clusters.Decide(observations1);
int[] labels3 = ms3.Clusters.Decide(observations1);
Assert.IsTrue(Matrix.IsEqual(labels1, labels2));
Assert.IsTrue(Matrix.IsEqual(labels1, labels3));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Modes, ms2.Clusters.Modes, 1e-3));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Modes, ms3.Clusters.Modes, 1e-3));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms2.Clusters.Proportions));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms3.Clusters.Proportions));
Assert.AreEqual(3 / 9.0, ms3.Clusters.Proportions[labels1[6]], 1e-6);
Assert.AreEqual(2 / 9.0, ms3.Clusters.Proportions[labels1[0]], 1e-6);
Assert.AreEqual(4 / 9.0, ms3.Clusters.Proportions[labels1[2]], 1e-6);
}
public void YinYangMeanShiftTest()
{
Accord.Math.Random.Generator.Seed = 1;
double[][] inputs = yinyang.Submatrix(null, 0, 1).ToJagged();
int[] outputs = yinyang.GetColumn(2).ToInt32();
MeanShift ms = new MeanShift(2, new GaussianKernel(dimension: 2), 0.55);
int[] labels = ms.Compute(inputs);
}
public void WeightedMeanShiftConstructorTest2()
{
Accord.Math.Tools.SetupGenerator(1);
// Declare some observations
double[][] observations1 =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 1, 1, 2 },
new double[] { 1, 1, 2 },
new double[] { 1, 1, 2 },
new double[] { 1, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
int[] weights1 = { 1, 1, 1, 1, 1, 1, 1, 1, 1 };
// Declare some observations
double[][] observations2 =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 1, 1, 2 },
// new double[] { 1, 1, 2 },
// new double[] { 1, 1, 2 },
// new double[] { 1, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
int[] weights2 = { 1, 1, 4, 1, 1, 1 };
Accord.Math.Random.Generator.Seed = 1;
var ms1 = new MeanShift(dimension: 3, kernel: new UniformKernel(), bandwidth: 2);
ms1.UseParallelProcessing = false;
ms1.Compute(observations1);
Accord.Math.Random.Generator.Seed = 1;
var ms2 = new MeanShift(dimension: 3, kernel: new UniformKernel(), bandwidth: 2);
ms2.UseParallelProcessing = false;
ms2.Compute(observations1, weights1);
Accord.Math.Random.Generator.Seed = 1;
var ms3 = new MeanShift(dimension: 3, kernel: new UniformKernel(), bandwidth: 2);
ms3.UseParallelProcessing = false;
ms3.Compute(observations2, weights2);
int[] labels1 = ms1.Clusters.Nearest(observations1);
int[] labels2 = ms2.Clusters.Nearest(observations1);
int[] labels3 = ms3.Clusters.Nearest(observations1);
Assert.IsTrue(Matrix.IsEqual(labels1, labels2));
Assert.IsTrue(Matrix.IsEqual(labels1, labels3));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Modes, ms2.Clusters.Modes, 1e-3));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Modes, ms3.Clusters.Modes, 1e-3));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms2.Clusters.Proportions));
Assert.IsTrue(Matrix.IsEqual(ms1.Clusters.Proportions, ms3.Clusters.Proportions));
Assert.AreEqual(3 / 9.0, ms3.Clusters.Proportions[labels1[6]], 1e-6);
Assert.AreEqual(2 / 9.0, ms3.Clusters.Proportions[labels1[0]], 1e-6);
Assert.AreEqual(4 / 9.0, ms3.Clusters.Proportions[labels1[2]], 1e-6);
}
public void Main()
{
List<string> abstracts = PullAbstracts(@"ExampleData\references.txt");
Stopwords sw = new Stopwords(@"ExampleData\Stopwords.txt");
StandardAnalyzer analyzer = new StandardAnalyzer(Net.Util.Version.LUCENE_30);
using (IndexWriter writer = new IndexWriter(FSDirectory.Open(@"ExampleData\Index"),
analyzer, IndexWriter.MaxFieldLength.LIMITED))
{
foreach (string ab in abstracts)
{
string trimmedAb = sw.TrimStopwords(ab);
if (trimmedAb.Contains("here "))
return;
Document document = new Document();
Field field = new Field("content", trimmedAb, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS);
document.Add(field);
writer.AddDocument(document);
}
writer.Optimize();
}
List<Dictionary<string, int>> vectors = new List<Dictionary<string, int>>();
using (IndexReader reader = IndexReader.Open(FSDirectory.Open(@"ExampleData\Index"), true))
{
// get all terms.
TermEnum termsEnum = reader.Terms();
List<string> termStrings = new List<string>();
while (termsEnum.Next())
{
string term = termsEnum.Term.Text;
string processed = null;
if (!sw.IsStopWord(term, out processed))
{
termStrings.Add(processed);
}
}
// create vectors
for (int c = 0; c < reader.NumDocs(); c++)
{
Dictionary<string, int> vector = new Dictionary<string, int>();
foreach (string term in termStrings)
{
vector.Add(term, 0);
}
ITermFreqVector freqVector = reader.GetTermFreqVector(c, "content");
string[] terms = freqVector.GetTerms();
foreach (string term in terms)
{
int count = vector[term];
vector[term] = count + 1;
}
vectors.Add(vector);
}
}
double summation = 0.0;
string[] keys = vectors[0].Keys.ToArray();
for (int c = 0; c < keys.Length; c++)
{
double val = (vectors[10][keys[c]] - vectors[11][keys[c]]);
summation += val * val;
}
double distance = Math.Sqrt(summation);
double[][] arr = new double[vectors.Count][];
for(int c=0;c<vectors.Count;c++)
{
arr[c] = vectors[c].Values.Select(m=>(double)m).ToArray();
}
int dimension = vectors[0].Values.Count;
double sigma = 14.0;
MeanShift meanShiftClustering = new MeanShift(dimension, new GaussianKernel(dimension), sigma);
int[] indices = meanShiftClustering.Compute(arr, .05, 100);
MeanShiftClusterCollection clusters = meanShiftClustering.Clusters;
return;
}
private object calcMeanShift(IPixelBlock3 vPb,IPixelBlock3 pb3)
{
double[][] jaArr = pixelBlockToJaggedArray(vPb);
int bands = vPb.Planes;
UniformKernel kernel = new UniformKernel();
//GaussianKernel kernel = new GaussianKernel(bands);
MeanShift ms = new MeanShift(bands, kernel, radius);
int[] vls = ms.Compute(jaArr, 0.05, 10);
NumClusters = ms.Clusters.Count;
Console.WriteLine(NumClusters);
return splitArray(vls, pb3);
}
public int ComputeClustering(Vertex[] points)
{
int pixelSize = 3;
// Retrieve the kernel bandwidth
// double sigma = (double)numBandwidth.Value;
// Create a MeanShift algorithm using the given bandwidth
// and a Gaussian density kernel as the kernel function:
Accord.Compat.ParallelOptions opt = new Accord.Compat.ParallelOptions();
opt.MaxDegreeOfParallelism = 1;
var meanShift = new MeanShift()
{
Kernel = new GaussianKernel((int)PARAM_2),
Bandwidth = PARAM_1,
ComputeLabels = true,
// Please set ParallelOptions.MaxDegreeOfParallelism to 1 instead.
ParallelOptions = opt
//Tolerance = 0.05,
// MaxIterations = (int)ITERATION
};
double[][] input = new double[points.Length][];
for (int i = 0; i < points.Length; ++i)
{
input[i] = points[i].Coords;
}
// Compute the mean-shift algorithm until the difference
// in shift vectors between two iterations is below 0.05
int[] classification = meanShift.Learn(input).Decide(input);
Hashtable ret = new Hashtable();
Hashtable wut = new Hashtable();
for (int i = 0; i < input.Length; ++i)
{
int idCluster = classification[i];
if (ret[idCluster] == null)
{
Facility newFac = new Facility();
newFac.VertexIndex = i;
newFac.Coords = meanShift.Clusters.Modes[idCluster];
ret.Add(idCluster, newFac);
points[i].IsFacility = true;
points[i].Facility = newFac;
}
else
{
((Facility)ret[idCluster]).AddVertex(i, 0);
}
}
facilities.Clear();
Console.WriteLine("===============================");
// WTF
foreach (Facility f in ret.Values)
{
//f.Coords = new double[points[0].Dimension];
//foreach (int v in f.VertexIndices)
//{
// for (int i = 0; i < f.Coords.Length; ++i)
// {
// f.Coords[i] += points[v][i];
// }
// for (int i = 0; i < f.Coords.Length; ++i)
// {
// f.Coords[i] /= f.VertexIndices.Count;
// }
//}
facilities.Add(f);
Console.WriteLine("Clients: {0}", f.VertexIndices.Count);
}
return(0);
}
private List <Line2> Skeletonize(out bool iscurve)
{
Image <Gray, byte> img2 = body_img.Copy();
Image <Gray, byte> eroded = new Image <Gray, byte>(img2.Size);
Image <Gray, byte> temp = new Image <Gray, byte>(img2.Size);
Image <Gray, byte> skel = new Image <Gray, byte>(img2.Size);
body_img.Save("test.png");
#region with matlab
string argument1 = "\"" + "test.png" + "\"";
System.Diagnostics.Process process = new System.Diagnostics.Process();
process.StartInfo.FileName = System.Environment.CurrentDirectory + "\\Assets\\frommatlab\\skeleton.exe";
process.StartInfo.Arguments = argument1;
process.StartInfo.UseShellExecute = false;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.RedirectStandardOutput = true;
//启动
process.Start();
process.WaitForExit();
#endregion
skel = new Image <Gray, byte>("prune.png");
ori_thin_img = new Image <Gray, byte>("thin.png");
ori_prune_img = skel;
#region thining - comment
//skel.SetValue(0);
//CvInvoke.Threshold(img2, temp, 127, 256, 0);
//var element = CvInvoke.GetStructuringElement(ElementShape.Cross, new Size(3, 3), new Point(-1, -1));
//bool done = false;
////skeleton
//int itr = 0;
//while (!done)
//{
// CvInvoke.Erode(img2, eroded, element, new Point(-1, -1), 1, BorderType.Reflect, default(MCvScalar));
// CvInvoke.Dilate(eroded, temp, element, new Point(-1, -1), 1, BorderType.Reflect, default(MCvScalar));
// CvInvoke.Subtract(img2, temp, temp);
// CvInvoke.BitwiseOr(skel, temp, skel);
// eroded.CopyTo(img2);
// itr++;
// if (CvInvoke.CountNonZero(img2) == 0) done = true;
//}
//Image<Gray, Byte> cannyimg = body_img.Canny(60, 100);
//CvInvoke.Dilate(cannyimg, cannyimg, element, new Point(-1, -1), 3, BorderType.Reflect, default(MCvScalar));
//CvInvoke.Subtract(skel, cannyimg, skel);
//ori_skel_img = skel.Copy();
////thinning
//if (!noface)
//{
// #region thinning
// List<Mat> cs = new List<Mat>();
// List<Mat> ds = new List<Mat>();
// for (int i = 0; i < 8; i++)
// {
// cs.Add(CvInvoke.GetStructuringElement(ElementShape.Cross, new Size(3, 3), new Point(-1, -1)));
// ds.Add(CvInvoke.GetStructuringElement(ElementShape.Cross, new Size(3, 3), new Point(-1, -1)));
// }
// cs[0].SetTo(new int[] { 0, 0, 0, 0, 1, 0, 1, 1, 1 });
// cs[1].SetTo(new int[] { 1, 0, 0, 1, 1, 0, 1, 0, 0 });
// cs[2].SetTo(new int[] { 1, 1, 1, 0, 1, 0, 0, 0, 0 });
// cs[3].SetTo(new int[] { 0, 0, 1, 0, 1, 1, 0, 0, 1 });
// ds[0].SetTo(new int[] { 1, 1, 1, 0, 0, 0, 0, 0, 0 });
// ds[1].SetTo(new int[] { 0, 0, 1, 0, 0, 1, 0, 0, 1 });
// ds[2].SetTo(new int[] { 0, 0, 0, 0, 0, 0, 1, 1, 1 });
// ds[3].SetTo(new int[] { 1, 0, 0, 1, 0, 0, 1, 0, 0 });
// cs[4].SetTo(new int[] { 0, 0, 0, 1, 1, 0, 1, 1, 0 });
// cs[5].SetTo(new int[] { 1, 1, 0, 1, 1, 0, 0, 0, 0 });
// cs[6].SetTo(new int[] { 0, 1, 1, 0, 1, 1, 0, 0, 0 });
// cs[7].SetTo(new int[] { 0, 0, 0, 0, 1, 1, 0, 1, 1 });
// ds[4].SetTo(new int[] { 0, 1, 1, 0, 0, 1, 0, 0, 0 });
// ds[5].SetTo(new int[] { 0, 0, 0, 0, 0, 1, 0, 1, 1 });
// ds[6].SetTo(new int[] { 0, 0, 0, 1, 0, 0, 1, 1, 0 });
// ds[7].SetTo(new int[] { 1, 1, 0, 1, 0, 0, 0, 0, 0 });
// Image<Gray, byte> img3 = skel.Copy();
// Image<Gray, byte> temp2 = skel.CopyBlank();
// Image<Gray, byte> lastimg3 = skel.Copy();
// done = false;
// while (!done)
// {
// for (int i = 0; i < 8; i++)
// {
// temp = this.HitOrMiss(img3, cs[i], ds[i]);
// CvInvoke.Subtract(img3, temp, img3);
// }
// CvInvoke.Subtract(lastimg3, img3, temp2);
// lastimg3 = img3.Copy();
// if (CvInvoke.CountNonZero(temp2) == 0) done = true;
// }
// //img3.Save("thining.png");
// #endregion
// skel = img3.Copy();
// ori_thinning_img = img3.Copy();
//}
////// remove noise
////for (int i = 0; i < img3.Height; i++)
////{
//// for (int j = 0; j < img3.Width; j++)
//// {
//// if (img3[i, j].Equals(new Gray(255)))
//// {
//// bool change = false;
//// for (int pad = 1; pad < 3; pad++)
//// {
//// if (i >= pad && i < img3.Height - pad && j >= pad && j < img3.Width - pad)
//// {
//// if (img3[i - pad, j].Equals(new Gray(0)) &&
//// img3[i - pad, j - pad].Equals(new Gray(0)) &&
//// img3[i - pad, j + pad].Equals(new Gray(0)) &&
//// img3[i + pad, j].Equals(new Gray(0)) &&
//// img3[i + pad, j - pad].Equals(new Gray(0)) &&
//// img3[i + pad, j + pad].Equals(new Gray(0)) &&
//// img3[i, j - pad].Equals(new Gray(0)) &&
//// img3[i, j + pad].Equals(new Gray(0)))
//// change = true;
//// }
//// }
//// if (change)
//// img3[i, j] = new Gray(0);
//// }
//// }
////}
////img3.Save("thiningdenoise.png");
#endregion
// get line
// consider both straight line and curve
LineSegment2D[] lines = skel.HoughLinesBinary(
1, //Distance resolution in pixel-related units
Math.PI / 180.0, //Angle resolution measured in radians.
3, //threshold
4, //min Line width
1 //gap between lines
)[0]; //Get the lines from the first channel
Image <Gray, byte> lineimg = skel.CopyBlank();
List <Line2> skel_lines = new List <Line2>();
foreach (LineSegment2D line in lines)
{
//remove image boundaries
//if (line.P1.X > 10 && line.P1.Y > 10 && line.P1.X < body_img.Height - 10 && line.P1.Y < body_img.Width &&
// line.P2.X > 10 && line.P2.Y > 10 && line.P2.X < body_img.Height - 10 && line.P2.Y < body_img.Width - 10)
//{
skel_lines.Add(new Line2(new Vector2(line.P1.X, line.P1.Y), new Vector2(line.P2.X, line.P2.Y)));
lineimg.Draw(line, new Gray(255), 2);
//}
}
if (debug)
{
lineimg.Save("skel-line.png");
}
// cluster according to direction and relative distance
// too many cluster means curve axis
IMGSIZE = Math.Min(body_img.Width, body_img.Height);
if (skel_lines.Count > 0)
{
double[][] xy = new double[skel_lines.Count][];
for (int i = 0; i < skel_lines.Count; i++)
{
xy[i] = new double[] { skel_lines[i].start.x, skel_lines[i].start.y,
skel_lines[i].end.x, skel_lines[i].end.y };
}
MeanShift clusterMS = new MeanShift(4, new UniformKernel(), 0.02);
clusterMS.Distance = new myDistanceClass();
MeanShiftClusterCollection clustering = clusterMS.Learn(xy);
var lineLabels = clustering.Decide(xy);
int clustercount = lineLabels.DistinctCount();
//Debug.Log("cluster count: " + clustercount);
if (debug)
{
Image <Rgb, byte> lineimg_rgb = lineimg.Convert <Rgb, byte>();
System.Random rnd = new System.Random();
Rgb[] colortable = new Rgb[clustering.Count];
for (int i = 0; i < clustering.Count; i++)
{
colortable[i] = new Rgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));
}
for (int i = 0; i < skel_lines.Count; i++)
{
int label = lineLabels[i];
lineimg_rgb.Draw(skel_lines[i].ToLineSegment2D(), colortable[label], 2);
}
lineimg_rgb.Save("skel-line-cluster.png");
}
if (noface)
{
thred = 2; // 2
}
if (clustercount > thred)
{
iscurve = true;
}
else
{
iscurve = false;
}
}
else
{
iscurve = false;
NumericalRecipes.RansacLine2d rcl = new NumericalRecipes.RansacLine2d();
List <Vector2> linepoints = new List <Vector2>();
linepoints = IExtension.GetMaskPoints(skel);
Line2 bestline = rcl.Estimate(linepoints);
skel_lines.Add(bestline);
}
return(skel_lines);
}
public void meanshift_new_method()
{
#region doc_sample1
// Use a fixed seed for reproducibility
Accord.Math.Random.Generator.Seed = 0;
// Declare some data to be clustered
double[][] input =
{
new double[] { -5, -2, -4 },
new double[] { -5, -5, -6 },
new double[] { 2, 1, 1 },
new double[] { 1, 1, 2 },
new double[] { 1, 2, 2 },
new double[] { 3, 1, 2 },
new double[] { 11, 5, 4 },
new double[] { 15, 5, 6 },
new double[] { 10, 5, 6 },
};
// Create a uniform kernel density function
UniformKernel kernel = new UniformKernel();
// Create a new Mean-Shift algorithm for 3 dimensional samples
MeanShift meanShift = new MeanShift(dimension: 3, kernel: kernel, bandwidth: 2);
// Learn a data partitioning using the Mean Shift algorithm
MeanShiftClusterCollection clustering = meanShift.Learn(input);
// Predict group labels for each point
int[] labels = clustering.Decide(input);
// As a result, the first two observations should belong to the
// same cluster (thus having the same label). The same should
// happen to the next four observations and to the last three.
#endregion
Assert.AreEqual(labels[0], labels[1]);
Assert.AreEqual(labels[2], labels[3]);
Assert.AreEqual(labels[2], labels[4]);
Assert.AreEqual(labels[2], labels[5]);
Assert.AreEqual(labels[6], labels[7]);
Assert.AreEqual(labels[6], labels[8]);
Assert.AreNotEqual(labels[0], labels[2]);
Assert.AreNotEqual(labels[2], labels[6]);
Assert.AreNotEqual(labels[0], labels[6]);
int[] labels2 = meanShift.Clusters.Nearest(input);
Assert.IsTrue(labels.IsEqual(labels2));
Assert.AreEqual(3 / 9.0, meanShift.Clusters.Proportions[labels[6]], 1e-6);
Assert.AreEqual(2 / 9.0, meanShift.Clusters.Proportions[labels[0]], 1e-6);
Assert.AreEqual(4 / 9.0, meanShift.Clusters.Proportions[labels[2]], 1e-6);
}
