/// <summary>
/// Construct reference plane from extrinsic calibration
/// </summary>
/// <param name="ecp">Extrinsic calibration</param>
public ReferencePlane(Emgu.CV.ExtrinsicCameraParameters ecp, Vector[] deviation_points, double[] deviations)
{
_ecp = ecp;
_plane = new Plane(ecp);
_deviation_points = deviation_points;
_deviations = deviations;
}
/// <summary>
/// Construct plane from extrinsic coordinate system
/// </summary>
/// <remarks>Z-vector is used as normal and translation offset is used to calculate D.</remarks>
/// <param name="ecp"></param>
public Plane(Emgu.CV.ExtrinsicCameraParameters ecp)
{
Matrix m = ecp.ExtrinsicMatrix.ToParsley();
_normal = m.GetColumnVector(2).Normalize();
_d = -Vector.ScalarProduct(m.GetColumnVector(3), _normal);
}
/// <summary>
/// Draw a visual indication of the pattern coordinate frame
/// </summary>
/// <param name="img">Image to draw to</param>
/// <param name="ecp">Extrinsic calibration</param>
/// <param name="icp">Intrinsic calibration</param>
public virtual void DrawCoordinateFrame(
Emgu.CV.Image <Bgr, Byte> img,
Emgu.CV.ExtrinsicCameraParameters ecp,
Emgu.CV.IntrinsicCameraParameters icp)
{
Drawing.DrawCoordinateFrame(img, ecp, icp);
}
public override object EditValue(
ITypeDescriptorContext context,
IServiceProvider provider,
object value)
{
if (context == null)
{
return(null);
}
using (OpenFileDialog ofd = new OpenFileDialog()) {
ofd.Filter = "Extrinsic Files|*.ecp";
if (ofd.ShowDialog() == DialogResult.OK)
{
Emgu.CV.ExtrinsicCameraParameters ecp = null;
try {
using (Stream s = File.Open(ofd.FileName, FileMode.Open)) {
if (s != null)
{
IFormatter formatter = new BinaryFormatter();
ecp = formatter.Deserialize(s) as Emgu.CV.ExtrinsicCameraParameters;
s.Close();
}
}
} catch (Exception) { }
return(ecp);
}
else
{
return(value);
}
}
}
public static void CalibrationError(
Emgu.CV.ExtrinsicCameraParameters ecp,
Emgu.CV.IntrinsicCameraParameters icp,
System.Drawing.PointF[] image_points,
Vector[] reference_points,
out double[] deviations,
out Vector[] isect_points)
{
// Shoot rays through image points,
// intersect with plane defined by extrinsic
// and measure distance to reference points
Matrix inv_ecp = Matrix.Identity(4, 4);
inv_ecp.SetMatrix(0, 2, 0, 3, ecp.ExtrinsicMatrix.ToParsley());
inv_ecp = inv_ecp.Inverse();
Ray[] rays = Ray.EyeRays(icp, image_points);
Plane p = new Plane(ecp);
isect_points = new Vector[rays.Length];
deviations = new double[rays.Length];
for (int i = 0; i < rays.Length; ++i)
{
double t;
Intersection.RayPlane(rays[i], p, out t);
Vector isect = rays[i].At(t);
Vector x = new Vector(new double[] { isect[0], isect[1], isect[2], 1 });
x = (inv_ecp * x.ToColumnMatrix()).GetColumnVector(0);
Vector final = new Vector(new double[] { x[0], x[1], x[2] });
isect_points[i] = final;
deviations[i] = (final - reference_points[i]).Norm();
}
}
PointF Backproject(Vector p, Emgu.CV.ExtrinsicCameraParameters ecp)
{
Matrix m = Matrix.Identity(4, 4);
m.SetMatrix(0, 2, 0, 3, ecp.ExtrinsicMatrix.ToParsley());
Matrix i = m.Inverse();
Vector x = new Vector(new double[] { p[0], p[1], p[2], 1 });
Matrix r = i * x.ToColumnMatrix();
PointF[] coords = Emgu.CV.CameraCalibration.ProjectPoints(
new MCvPoint3D32f[] {
new MCvPoint3D32f((float)r[0, 0], (float)r[1, 0], (float)r[2, 0])
},
ecp,
Context.Setup.World.Camera.Intrinsics);
return(coords[0]);
}
override protected void OnFrame(Parsley.Core.BuildingBlocks.FrameGrabber fp, Emgu.CV.Image <Emgu.CV.Structure.Bgr, byte> img)
{
Core.CalibrationPattern pattern = this.Context.CalibrationPattern;
Emgu.CV.Image <Gray, Byte> gray = img.Convert <Gray, Byte>();
gray._EqualizeHist();
pattern.FindPattern(gray);
if (pattern.PatternFound)
{
Emgu.CV.ExtrinsicCameraParameters ecp = _ex.Calibrate(pattern.ImagePoints);
lock (Context.Viewer) {
Matrix m = Matrix.Identity(4, 4);
m.SetMatrix(0, 2, 0, 3, ecp.ExtrinsicMatrix.ToParsley());
_board_transform.Matrix = m.ToInterop();
}
}
pattern.DrawPattern(img, pattern.ImagePoints, pattern.PatternFound);
}
public static void VisualizeError(
Emgu.CV.Image <Bgr, Byte> img,
Emgu.CV.ExtrinsicCameraParameters ecp,
Emgu.CV.IntrinsicCameraParameters icp,
double[] deviations,
Vector[] isect_points)
{
Bgr bgr = new Bgr(System.Drawing.Color.Green);
MCvFont f = new MCvFont(Emgu.CV.CvEnum.FONT.CV_FONT_HERSHEY_PLAIN, 0.8, 0.8);
foreach (Vector p in isect_points)
{
System.Drawing.PointF[] coords = Emgu.CV.CameraCalibration.ProjectPoints(
new MCvPoint3D32f[] { p.ToEmguF() },
ecp, icp
);
img.Draw(new CircleF(coords[0], 1), bgr, 1);
}
}
/// <summary>
/// Draw a visual indication of the pattern coordinate frame
/// </summary>
/// <param name="img">Image to draw to</param>
/// <param name="ecp">Extrinsic calibration</param>
/// <param name="icp">Intrinsic calibration</param>
public static void DrawCoordinateFrame(
Emgu.CV.Image <Bgr, Byte> img,
Emgu.CV.ExtrinsicCameraParameters ecp,
Emgu.CV.IntrinsicCameraParameters icp)
{
float extension = img.Width / 10;
PointF[] coords = Emgu.CV.CameraCalibration.ProjectPoints(
new MCvPoint3D32f[] {
new MCvPoint3D32f(0, 0, 0),
new MCvPoint3D32f(extension, 0, 0),
new MCvPoint3D32f(0, extension, 0),
new MCvPoint3D32f(0, 0, extension),
},
ecp, icp);
img.Draw(new LineSegment2DF(coords[0], coords[1]), new Bgr(System.Drawing.Color.Red), 2);
img.Draw(new LineSegment2DF(coords[0], coords[2]), new Bgr(System.Drawing.Color.Green), 2);
img.Draw(new LineSegment2DF(coords[0], coords[3]), new Bgr(System.Drawing.Color.Blue), 2);
}
public static void TestOpenCVProjection()
{
int numPoints = 1;
Matrix<double> worldPoints = DenseMatrix.CreateRandom(2, numPoints, new ContinuousUniform(100, 300));
worldPoints = worldPoints.InsertRow(2, DenseVector.CreateRandom(numPoints, new ContinuousUniform(500, 2000)));
var posePosition = new DenseVector(new double[] { 1000, 2000, 3000 });
var poseQuat = new DenseVector(new double[] { 0.4823661149, -0.009425591677, 0.8759094477, -0.004083401989 });
//var poseQuat = new DenseVector(new double[] { 1, 0, 0, 0 });
var extParameters = new Emgu.CV.ExtrinsicCameraParameters();
extParameters.RotationVector = new Emgu.CV.RotationVector3D();
extParameters.RotationVector.RotationMatrix = poseQuat.QuaternionToRotation().Inverse().ToEmguMatrix();
extParameters.TranslationVector = (-posePosition).ToColumnMatrix().ToEmguMatrix();
DenseMatrix calibrationMatrix = (DenseMatrix)Pose3D.CreateCalibrationMatrix(525, 320, 240);
var intParameters = new Emgu.CV.IntrinsicCameraParameters();
intParameters.IntrinsicMatrix = calibrationMatrix.ToEmguMatrix();
var openCVProjectedPoints =
Emgu.CV.CameraCalibration.ProjectPoints(
worldPoints.ColumnEnumerator().Select(col => new MCvPoint3D32f((float)col.Item2[0], (float)col.Item2[1], (float)col.Item2[2])).ToArray(),
extParameters,
intParameters);
Console.WriteLine("Open CV Projeted points: \n{0:0.00}", openCVProjectedPoints.ToMatrix(p => new double[] { p.X, p.Y }).Transpose());
var myProjectedPoints = Pose3D.WorldToImagePoints(
worldPoints,
calibrationMatrix,
posePosition,
poseQuat.QuaternionToRotation());
Console.WriteLine("My Projeted points: \n{0:0.00}", myProjectedPoints);
}
/// <summary>
/// Generate a intrinsic/extrinsic calibration from an initial set of four marker points.
/// </summary>
/// <param name="finals">List of ellipses</param>
/// <param name="marker_ids">Ellipse ids of detected marker-ellipses</param>
/// <param name="icp">Resulting intrinsic calibration</param>
/// <param name="ecp">Resulting extrinsic calibration</param>
/// <param name="size">Image size</param>
private void ApproximatePlane(List <DetectedEllipse> finals, int[] marker_ids, out Emgu.CV.IntrinsicCameraParameters icp, out Emgu.CV.ExtrinsicCameraParameters ecp, System.Drawing.Size size)
{
// Currently the marker points correspond to corner points in the rectangular pattern.
Vector[] object_points = new Vector[] {
this.ObjectPoints[0],
this.ObjectPoints[_number_circle_centers.Width - 1],
this.ObjectPoints[_number_circle_centers.Width * (_number_circle_centers.Height - 1)],
this.ObjectPoints[_number_circle_centers.Width * _number_circle_centers.Height - 1]
};
System.Drawing.PointF[] image_points =
marker_ids.Select(id => { return(finals[id].Ellipse.MCvBox2D.center); }).ToArray();
Parsley.Core.IntrinsicCalibration ic = new Parsley.Core.IntrinsicCalibration(object_points, size);
ic.AddView(image_points);
icp = ic.Calibrate();
Parsley.Core.ExtrinsicCalibration ec = new Parsley.Core.ExtrinsicCalibration(object_points, icp);
ecp = ec.Calibrate(image_points);
}
//confirm 3d geometry to infer the pose given many world points and 2d pixels
public static void TestPoseEstimationOpenCV()
{
DenseVector poseQuat = new DenseVector(new double[] { 1, 0, 0, 0 });
DenseVector posePosition = new DenseVector(new double[] { 0, 0, 0 });
DenseMatrix calibrationMatrix = (DenseMatrix)Pose3D.CreateCalibrationMatrix(525, 320, 240);
int numPoints = 7;
Matrix<double> worldPoints = DenseMatrix.CreateRandom(2, numPoints, new ContinuousUniform(100, 300));
worldPoints = worldPoints.InsertRow(2, DenseVector.CreateRandom(numPoints, new ContinuousUniform(500, 2000)));
var extParameters = new Emgu.CV.ExtrinsicCameraParameters();
extParameters.RotationVector = new Emgu.CV.RotationVector3D(new double[] { 4, 5, 6 });
extParameters.TranslationVector = new Emgu.CV.Matrix<double>(new double[] { 1, 2, 3 });
Console.WriteLine("Known extrinsic:\n {0}", RGBLocalization.Utility.MatrixExtensions.ToString(extParameters.ExtrinsicMatrix));
Console.WriteLine("Known extrinsic (translation vector):\n {0}", RGBLocalization.Utility.MatrixExtensions.ToString(extParameters.TranslationVector));
var intParameters = new Emgu.CV.IntrinsicCameraParameters();
intParameters.IntrinsicMatrix = calibrationMatrix.ToEmguMatrix();
var projectedPoints =
Emgu.CV.CameraCalibration.ProjectPoints(
worldPoints.ColumnEnumerator().Select(col => new MCvPoint3D32f((float)col.Item2[0], (float)col.Item2[1], (float)col.Item2[2])).ToArray(),
extParameters,
intParameters);
Console.WriteLine("Known world: \n{0:0.00}", worldPoints);
Console.WriteLine("Projeted points: \n{0:0.00}", projectedPoints.ToMatrix(p => new double[] { p.X, p.Y }).Transpose());
var inferredExtParameters =
Emgu.CV.CameraCalibration.FindExtrinsicCameraParams2(
worldPoints.ColumnEnumerator().Select(col => new MCvPoint3D32f((float)col.Item2[0], (float)col.Item2[1], (float)col.Item2[2])).ToArray(),
projectedPoints,
intParameters
);
Console.WriteLine("Inferred Ext: \n{0:0.00}", RGBLocalization.Utility.MatrixExtensions.ToString(inferredExtParameters.ExtrinsicMatrix));
Console.WriteLine("Inferred Ext (translation vector): \n{0:0.00}", RGBLocalization.Utility.MatrixExtensions.ToString(inferredExtParameters.TranslationVector));
}
/// <summary>
/// Construct reference plane from extrinsic calibration
/// </summary>
/// <param name="ecp">Extrinsic calibration</param>
public ReferencePlane(Emgu.CV.ExtrinsicCameraParameters ecp, Vector[] deviation_points, double[] deviations) {
_ecp = ecp;
_plane = new Plane(ecp);
_deviation_points = deviation_points;
_deviations = deviations;
}
public static void TestImageMapConsistency(string mapFile, string poseFile)
{
Func<System.Drawing.PointF, System.Drawing.PointF, double> distance2D = (p1, p2) =>
Math.Sqrt(Math.Pow(p1.X - p2.X, 2) + Math.Pow(p1.Y - p2.Y, 2));
Func<DenseVector, System.Drawing.PointF> ToPointF = v => new System.Drawing.PointF((float)v[0], (float)v[1]);
//string mapFile = @"C:\Kamal\RSE\WorkingDirs\Visualizaton\espresso-1.bag.dump.map";
//string poseFile = @"C:\Kamal\RSE\RawData\espresso-1-fs-0\espresso-1-fs-0\espresso-1-fs-0\loop_closure\loop-closure.txt";
DenseMatrix camCalibration = (DenseMatrix)Pose3D.CreateCalibrationMatrix(525, 320, 240);
var intParameters = new Emgu.CV.IntrinsicCameraParameters();
intParameters.IntrinsicMatrix = camCalibration.ToEmguMatrix();
var poseData = ImageMap.ParsePoseData(File.ReadLines(poseFile),
(frameID, poseQuaternion, posePosition) =>
new
{
frameID,
poseQuaternion,
posePosition
})
.ToDictionary(p => p.frameID, p => new { p.posePosition, p.poseQuaternion });
Func<DenseVector, DenseVector, DenseVector, System.Drawing.PointF> OpenCVProject =
(point3D, posePosition, poseQuat) =>
{
var extParameters = new Emgu.CV.ExtrinsicCameraParameters();
extParameters.RotationVector = new Emgu.CV.RotationVector3D();
extParameters.RotationVector.RotationMatrix = poseQuat.QuaternionToRotation().Inverse().ToEmguMatrix();
extParameters.TranslationVector = (-posePosition).ToColumnMatrix().ToEmguMatrix();
return
Emgu.CV.CameraCalibration.ProjectPoints(
new MCvPoint3D32f[] { new MCvPoint3D32f((float)point3D[0], (float)point3D[1], (float)point3D[2]) },
extParameters,
intParameters)[0];
};
var imageMap =
ImageMap.LoadImageMap(mapFile, (frameID, imagePoint, depth, point3D, descriptor) =>
new
{
frameID,
projectedPoint = OpenCVProject(point3D, poseData[frameID].posePosition, poseData[frameID].poseQuaternion),
myImpProjectedPoint = (DenseVector)Pose3D.WorldToImagePoints(point3D.ToColumnMatrix(), camCalibration, poseData[frameID].posePosition, poseData[frameID].poseQuaternion.QuaternionToRotation()).Column(0),
imagePoint,
depth,
point3D,
descriptor
}).ToList();
Console.WriteLine("OpevCV vs. myImp Projection error: {0}", imageMap.Average(p => distance2D(ToPointF(p.myImpProjectedPoint), p.projectedPoint)));
Console.WriteLine("OpevCV vs. imagepoints Projection error: {0}", imageMap.Average(p => distance2D(p.imagePoint, p.projectedPoint)));
foreach (var p in imageMap.Where(p => distance2D(ToPointF(p.myImpProjectedPoint), p.projectedPoint) > 1000).Take(10))
{
Console.WriteLine("----------");
Console.WriteLine("OpenCV:\t{0}", p.projectedPoint);
Console.WriteLine("Image:\t{0}", p.imagePoint);
Console.WriteLine("Depth:\t{0}", p.depth);
Console.WriteLine("point3d:\t {0}", p.point3D);
Console.WriteLine("pose:\t {0}", poseData[p.frameID].posePosition);
Console.WriteLine("quat:\t {0}", poseData[p.frameID].poseQuaternion);
Console.WriteLine("my proj impl:\t{0}",
p.point3D.ToColumnMatrix().WorldToImagePoints(camCalibration, poseData[p.frameID].posePosition, poseData[p.frameID].poseQuaternion.QuaternionToRotation()));
Console.WriteLine("Re-inferred 3d point: {0}",
Pose3D.DPixelToWorld(
poseData[p.frameID].poseQuaternion,
poseData[p.frameID].posePosition,
(DenseMatrix)camCalibration.Inverse(),
new DenseMatrix(3, 1, new double[] { p.imagePoint.X, p.imagePoint.Y, 1.0 }),
new DenseMatrix(1, 1, new double[] { p.depth })));
}
}
/// <summary>
/// Tries to find the composite pattern and returns the output parameter image_points.
/// In case of success the boolean value 'true' is returned.
/// Note, that CompositePatterns can only be found, if the cameras' intrinsics are set.
///
/// The algorithm is working as follows:
/// If the main pattern 'patternA' could be found, the algorithm is finished already and the resulting
/// image_points are known and returned.
/// If only 'patternB' could be found, the given object_points of 'patternA' are transformed in the
/// 'patternB' coordinate system, using the predefined transformation matrix.
/// Furthermore, an extrinsic calibration is performed in order to find the extrinsic matrix, which describes
/// the relation between camera coordinate system and the coordinate system of 'patternB'.
/// Finally, the library function 'ProjectPoints' is called in order to project the transformed object_points
/// (currently expressed in 'patternB'-coordinates) into the camera image plane.
/// The projected points correspond to the image_points of 'patternA'.
/// ==> To sum up: the predefined transformation is used to calculate the image_points of 'patternA', even
/// if 'patternA' is invisible.
/// </summary>
/// <param name="img"> Input grayscale image. </param>
/// <param name="image_points"> 2D output image points. </param>
/// <returns> true... if pattern has been found; false... otherwise. </returns>
public override bool FindPattern(Emgu.CV.Image <Emgu.CV.Structure.Gray, byte> img, out System.Drawing.PointF[] image_points)
{
if (this.IntrinsicParameters != null && _patternA != null && _patternB != null)
{
bool foundA = false;
System.Drawing.PointF[] currentImagePointsA;
System.Drawing.PointF[] currentImagePointsB;
//set the object_points of the composite pattern to the object_points of 'patternA'
this.ObjectPoints = _patternA.ObjectPoints;
//try to find 'patternA'
foundA = _patternA.FindPattern(img, out currentImagePointsA);
//if 'patternA' could be found: the image_points have been found.
if (foundA)
{
image_points = currentImagePointsA;
//_logger.Info("Pattern found.");
return(true);
}
else
//else: try to find 'patternB'
if (_patternB.FindPattern(img, out currentImagePointsB))
{
ExtrinsicCalibration ec_B = null;
Emgu.CV.ExtrinsicCameraParameters ecp_B = null;
Matrix extrinsic_matrix = Matrix.Identity(4, 4);
Matrix temp_matrix = null;
Emgu.CV.Structure.MCvPoint3D32f[] transformedCornerPoints = new Emgu.CV.Structure.MCvPoint3D32f[_patternA.ObjectPoints.Length];
try
{
//if 'patternB' has been found: find the extrinsic matrix (relation between coordinate systems of 'patternB' and camera
ec_B = new ExtrinsicCalibration(_patternB.ObjectPoints, this.IntrinsicParameters);
ecp_B = ec_B.Calibrate(currentImagePointsB);
if (ecp_B != null)
{
//form the resulting extrinsic matrix to a homogeneous (4x4) matrix.
temp_matrix = Parsley.Core.Extensions.ConvertToParsley.ToParsley(ecp_B.ExtrinsicMatrix);
extrinsic_matrix.SetMatrix(0, temp_matrix.RowCount - 1, 0, temp_matrix.ColumnCount - 1, temp_matrix);
//transform object points of A into B coordinate system.
transformedCornerPoints = MatrixTransformation.TransformVectorToEmgu(_transformationBToA.Inverse(), 1.0, _patternA.ObjectPoints).ToArray <Emgu.CV.Structure.MCvPoint3D32f>();
//project the points into the 2D camera plane (image_points)
image_points = Emgu.CV.CameraCalibration.ProjectPoints(transformedCornerPoints, ecp_B, this.IntrinsicParameters);
return(true);
}
else
{
_logger.Warn("Error calculating extrinsic parameters.");
image_points = null;
return(false);
}
}
catch (Exception e)
{
_logger.Warn("Caught Exception: {0}.", e);
image_points = null;
return(false);
}
}
else
{
//reset the image_points if the pattern could not be found.
image_points = null;
return(false);
}
}
else
{
_logger.Warn("Error: Intrinsics are needed to find a Composite Pattern but not available.");
image_points = null;
return(false);
}
}