public void TestMatToFileStorage()
{
//create a matrix m with random values
Mat m = new Mat(120, 240, DepthType.Cv8U, 1);
using (ScalarArray low = new ScalarArray(0))
using (ScalarArray high = new ScalarArray(255))
CvInvoke.Randu(m, low, high);
//Convert the random matrix m to yml format, good for matrix that contains values such as calibration, homography etc.
String mStr;
using (FileStorage fs = new FileStorage(".yml", FileStorage.Mode.Write | FileStorage.Mode.Memory))
{
fs.Write(m, "m");
mStr = fs.ReleaseAndGetString();
}
//Treat the Mat as image data and convert it to png format.
using (VectorOfByte bytes = new VectorOfByte())
{
CvInvoke.Imencode(".png", m, bytes);
byte[] rawData = bytes.ToArray();
}
}
/// <summary>
/// Stores algorithm parameters in a file storage
/// </summary>
/// <param name="algorithm">The algorithm.</param>
/// <param name="storage">The storage.</param>
public static void Write(this IAlgorithm algorithm, FileStorage storage)
{
CvInvoke.cveAlgorithmWrite(algorithm.AlgorithmPtr, storage);
}
public void TestKNearest()
{
int K = 10;
int trainSampleCount = 100;
#region Generate the training data and classes
Matrix<float> trainData = new Matrix<float>(trainSampleCount, 2);
Matrix<float> trainClasses = new Matrix<float>(trainSampleCount, 1);
Image<Bgr, Byte> img = new Image<Bgr, byte>(500, 500);
Matrix<float> sample = new Matrix<float>(1, 2);
Matrix<float> trainData1 = trainData.GetRows(0, trainSampleCount >> 1, 1);
trainData1.SetRandNormal(new MCvScalar(200), new MCvScalar(50));
Matrix<float> trainData2 = trainData.GetRows(trainSampleCount >> 1, trainSampleCount, 1);
trainData2.SetRandNormal(new MCvScalar(300), new MCvScalar(50));
Matrix<float> trainClasses1 = trainClasses.GetRows(0, trainSampleCount >> 1, 1);
trainClasses1.SetValue(1);
Matrix<float> trainClasses2 = trainClasses.GetRows(trainSampleCount >> 1, trainSampleCount, 1);
trainClasses2.SetValue(2);
#endregion
Matrix<float> results, neighborResponses;
results = new Matrix<float>(sample.Rows, 1);
neighborResponses = new Matrix<float>(sample.Rows, K);
//dist = new Matrix<float>(sample.Rows, K);
using (KNearest knn = new KNearest())
{
knn.DefaultK = K;
knn.IsClassifier = true;
knn.Train(trainData, MlEnum.DataLayoutType.RowSample, trainClasses);
//ParamDef[] defs = knn.GetParams();
//TODO: find out when knn.save will be implemented
//knn.Save("knn.xml");
for (int i = 0; i < img.Height; i++)
{
for (int j = 0; j < img.Width; j++)
{
sample.Data[0, 0] = j;
sample.Data[0, 1] = i;
// estimates the response and get the neighbors' labels
float response = knn.Predict(sample); //knn.FindNearest(sample, K, results, null, neighborResponses, null);
int accuracy = 0;
// compute the number of neighbors representing the majority
for (int k = 0; k < K; k++)
{
if (neighborResponses.Data[0, k] == response)
accuracy++;
}
// highlight the pixel depending on the accuracy (or confidence)
img[i, j] =
response == 1 ?
(accuracy > 5 ? new Bgr(90, 0, 0) : new Bgr(90, 40, 0)) :
(accuracy > 5 ? new Bgr(0, 90, 0) : new Bgr(40, 90, 0));
}
}
String knnModelStr;
//save stat model to string
using (FileStorage fs = new FileStorage(".yml", FileStorage.Mode.Write | FileStorage.Mode.Memory))
{
knn.Write(fs);
knnModelStr = fs.ReleaseAndGetString();
}
//load stat model from string
using (FileStorage fs = new FileStorage(knnModelStr, FileStorage.Mode.Read | FileStorage.Mode.Memory))
{
KNearest knn2 = new KNearest();
knn2.Read(fs.GetRoot());
}
}
// display the original training samples
for (int i = 0; i < (trainSampleCount >> 1); i++)
{
PointF p1 = new PointF(trainData1[i, 0], trainData1[i, 1]);
img.Draw(new CircleF(p1, 2.0f), new Bgr(255, 100, 100), -1);
PointF p2 = new PointF(trainData2[i, 0], trainData2[i, 1]);
img.Draw(new CircleF(p2, 2.0f), new Bgr(100, 255, 100), -1);
}
//Emgu.CV.UI.ImageViewer.Show(img);
}
public void TestSVM()
{
int trainSampleCount = 150;
int sigma = 60;
#region Generate the training data and classes
Matrix<float> trainData = new Matrix<float>(trainSampleCount, 2);
Matrix<float> trainClasses = new Matrix<float>(trainSampleCount, 1);
Image<Bgr, Byte> img = new Image<Bgr, byte>(500, 500);
Matrix<float> sample = new Matrix<float>(1, 2);
Matrix<float> trainData1 = trainData.GetRows(0, trainSampleCount / 3, 1);
trainData1.GetCols(0, 1).SetRandNormal(new MCvScalar(100), new MCvScalar(sigma));
trainData1.GetCols(1, 2).SetRandNormal(new MCvScalar(300), new MCvScalar(sigma));
Matrix<float> trainData2 = trainData.GetRows(trainSampleCount / 3, 2 * trainSampleCount / 3, 1);
trainData2.SetRandNormal(new MCvScalar(400), new MCvScalar(sigma));
Matrix<float> trainData3 = trainData.GetRows(2 * trainSampleCount / 3, trainSampleCount, 1);
trainData3.GetCols(0, 1).SetRandNormal(new MCvScalar(300), new MCvScalar(sigma));
trainData3.GetCols(1, 2).SetRandNormal(new MCvScalar(100), new MCvScalar(sigma));
Matrix<float> trainClasses1 = trainClasses.GetRows(0, trainSampleCount / 3, 1);
trainClasses1.SetValue(1);
Matrix<float> trainClasses2 = trainClasses.GetRows(trainSampleCount / 3, 2 * trainSampleCount / 3, 1);
trainClasses2.SetValue(2);
Matrix<float> trainClasses3 = trainClasses.GetRows(2 * trainSampleCount / 3, trainSampleCount, 1);
trainClasses3.SetValue(3);
#endregion
//using (SVM.Params p = new SVM.Params(MlEnum.SvmType.CSvc, MlEnum.SvmKernelType.Linear, 0, 1, 0, 1, 0, 0, null, new MCvTermCriteria(100, 1.0e-6)))
using (SVM model = new SVM())
using (Matrix<int> trainClassesInt = trainClasses.Convert<int>())
using (TrainData td = new TrainData(trainData, MlEnum.DataLayoutType.RowSample, trainClassesInt))
{
model.Type = SVM.SvmType.CSvc;
model.SetKernel(SVM.SvmKernelType.Inter);
model.Degree = 0;
model.Gamma = 1;
model.Coef0 = 0;
model.C = 1;
model.Nu = 0;
model.P = 0;
model.TermCriteria = new MCvTermCriteria(100, 1.0e-6);
//bool trained = model.TrainAuto(td, 5);
model.Train(td);
#if !NETFX_CORE
String fileName = "svmModel.xml";
//String fileName = Path.Combine(Path.GetTempPath(), "svmModel.xml");
model.Save(fileName);
SVM model2 = new SVM();
FileStorage fs = new FileStorage(fileName, FileStorage.Mode.Read);
model2.Read(fs.GetFirstTopLevelNode());
if (File.Exists(fileName))
File.Delete(fileName);
#endif
for (int i = 0; i < img.Height; i++)
{
for (int j = 0; j < img.Width; j++)
{
sample.Data[0, 0] = j;
sample.Data[0, 1] = i;
float response = model.Predict(sample);
img[i, j] =
response == 1 ? new Bgr(90, 0, 0) :
response == 2 ? new Bgr(0, 90, 0) :
new Bgr(0, 0, 90);
}
}
Mat supportVectors = model.GetSupportVectors();
//TODO: find out how to draw the support vectors
Image<Gray, float> pts = supportVectors.ToImage<Gray, float>();
PointF[] vectors = new PointF[supportVectors.Rows];
GCHandle handler = GCHandle.Alloc(vectors, GCHandleType.Pinned);
using (
Mat vMat = new Mat(supportVectors.Rows, supportVectors.Cols, DepthType.Cv32F, 1,
handler.AddrOfPinnedObject(), supportVectors.Cols*4))
{
supportVectors.CopyTo(vMat);
}
handler.Free();
/*
int c = model.GetSupportVectorCount();
for (int i = 0; i < c; i++)
{
float[] v = model.GetSupportVector(i);
PointF p1 = new PointF(v[0], v[1]);
img.Draw(new CircleF(p1, 4), new Bgr(128, 128, 128), 2);
}*/
}
// display the original training samples
for (int i = 0; i < (trainSampleCount / 3); i++)
{
PointF p1 = new PointF(trainData1[i, 0], trainData1[i, 1]);
img.Draw(new CircleF(p1, 2.0f), new Bgr(255, 100, 100), -1);
PointF p2 = new PointF(trainData2[i, 0], trainData2[i, 1]);
img.Draw(new CircleF(p2, 2.0f), new Bgr(100, 255, 100), -1);
PointF p3 = new PointF(trainData3[i, 0], trainData3[i, 1]);
img.Draw(new CircleF(p3, 2.0f), new Bgr(100, 100, 255), -1);
}
//Emgu.CV.UI.ImageViewer.Show(img);
}
static internal extern IntPtr cveFileStorageCreate(IntPtr source, FileStorage.Mode flags, IntPtr encoding);
public void TestFileStorage2()
{
Mat m = new Mat(40, 30, DepthType.Cv8U, 3);
using (ScalarArray lower = new ScalarArray(new MCvScalar(0, 0, 0)))
using (ScalarArray higher = new ScalarArray(new MCvScalar(255, 255, 255)))
CvInvoke.Randu(m, lower, higher );
int intValue = 10;
float floatValue = 213.993f;
double doubleValue = 32.314;
using (FileStorage fs = new FileStorage(".xml", FileStorage.Mode.Write | FileStorage.Mode.Memory))
{
fs.Write(m, "m");
fs.Write(intValue, "int");
fs.Write(floatValue, "float");
fs.Write(doubleValue, "double");
string s = fs.ReleaseAndGetString();
using (FileStorage fs2 = new FileStorage(s, FileStorage.Mode.Read | FileStorage.Mode.Memory))
{
using (FileNode node = fs2.GetFirstTopLevelNode())
{
Mat m2 = new Mat();
node.ReadMat(m2);
EmguAssert.IsTrue(m.Equals(m2));
}
using (FileNode node = fs2.GetNode("m"))
{
Mat m2 = new Mat();
node.ReadMat(m2);
EmguAssert.IsTrue(m.Equals(m2));
}
using (FileNode node = fs2.GetNode("int"))
{
EmguAssert.IsTrue(intValue.Equals(node.ReadInt()));
}
using (FileNode node = fs2.GetNode("float"))
{
EmguAssert.IsTrue(floatValue.Equals(node.ReadFloat()));
}
using (FileNode node = fs2.GetNode("double"))
{
EmguAssert.IsTrue(doubleValue.Equals(node.ReadDouble()));
}
}
}
}
public void TestFileStorage1()
{
FileStorage fs = new FileStorage("haarcascade_eye.xml", FileStorage.Mode.Read);
}
/// <summary>
/// Create a Cuda cascade classifier using the specific file storage
/// </summary>
/// <param name="fs">The file storage to create the classifier from</param>
public CudaCascadeClassifier(FileStorage fs)
{
_ptr = CudaInvoke.cudaCascadeClassifierCreateFromFileStorage(fs);
}
/// <summary>
/// Stores algorithm parameters in a file storage
/// </summary>
/// <param name="algorithm">The algorithm.</param>
/// <param name="storage">The storage.</param>
/// <param name="name">The name of the node</param>
public static void Write(this IAlgorithm algorithm, FileStorage storage, String name)
{
using (CvString csName = new CvString(name))
CvInvoke.cveAlgorithmWrite2(algorithm.AlgorithmPtr, storage, csName);
}
/// <summary>
/// Stores algorithm parameters in a file storage
/// </summary>
/// <param name="algorithm">The algorithm.</param>
/// <param name="storage">The storage.</param>
public static void Write(this IAlgorithm algorithm, FileStorage storage)
{
CvInvoke.cveAlgorithmWrite(algorithm.AlgorithmPtr, storage);
}
