private void ComputeVelocities(TrajectoryKinematics kinematics, CalibrationHelper calibrationHelper) { if (kinematics.Length <= 2) { PadVelocities(kinematics); return; } for (int i = 1; i < kinematics.Length - 1; i++) { PointF a = kinematics.Coordinates(i - 1); PointF b = kinematics.Coordinates(i + 1); float t = calibrationHelper.GetTime(2); kinematics.Speed[i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Magnitude)); kinematics.HorizontalVelocity[i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Horizontal)); kinematics.VerticalVelocity[i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Vertical)); } PadVelocities(kinematics); double constantVelocitySpan = 40; MovingAverage filter = new MovingAverage(); kinematics.Speed = filter.FilterSamples(kinematics.Speed, calibrationHelper.CaptureFramesPerSecond, constantVelocitySpan, 1); kinematics.HorizontalVelocity = filter.FilterSamples(kinematics.HorizontalVelocity, calibrationHelper.CaptureFramesPerSecond, constantVelocitySpan, 1); kinematics.VerticalVelocity = filter.FilterSamples(kinematics.VerticalVelocity, calibrationHelper.CaptureFramesPerSecond, constantVelocitySpan, 1); }
private void ComputeRawVelocities(TrajectoryKinematics kinematics, CalibrationHelper calibrationHelper) { if (kinematics.Length <= 2) { PadRawVelocities(kinematics); return; } for (int i = 1; i < kinematics.Length - 1; i++) { PointF a = kinematics.RawCoordinates(i - 1); PointF b = kinematics.RawCoordinates(i + 1); float t = calibrationHelper.GetTime(2); kinematics.RawSpeed[i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Magnitude)); kinematics.RawHorizontalVelocity[i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Horizontal)); kinematics.RawVerticalVelocity[i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Vertical)); } PadRawVelocities(kinematics); }
private void ComputeVelocities(TimeSeriesCollection tsc, CalibrationHelper calibrationHelper, Func <int, PointF> getCoord) { if (tsc.Length <= 2) { PadVelocities(tsc); return; } for (int i = 1; i < tsc.Length - 1; i++) { PointF a = getCoord(i - 1); PointF b = getCoord(i + 1); float t = calibrationHelper.GetTime(2); tsc[Kinematics.LinearSpeed][i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Magnitude)); tsc[Kinematics.LinearHorizontalVelocity][i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Horizontal)); tsc[Kinematics.LinearVerticalVelocity][i] = (double)calibrationHelper.ConvertSpeed(GetSpeed(a, b, t, Component.Vertical)); } PadVelocities(tsc); // Second pass: apply extra smoothing to the derivatives. // This is only applied for high speed videos where the digitization is very noisy // due to the combination of increased time resolution and decreased spatial resolution. double constantVelocitySpan = 40; MovingAverage filter = new MovingAverage(); double[] averagedVelocity = filter.FilterSamples(tsc[Kinematics.LinearSpeed], calibrationHelper.CaptureFramesPerSecond, constantVelocitySpan, 1); double[] averagedHorizontalVelocity = filter.FilterSamples(tsc[Kinematics.LinearHorizontalVelocity], calibrationHelper.CaptureFramesPerSecond, constantVelocitySpan, 1); double[] averagedVerticalVelocity = filter.FilterSamples(tsc[Kinematics.LinearVerticalVelocity], calibrationHelper.CaptureFramesPerSecond, constantVelocitySpan, 1); for (int i = 0; i < tsc.Length; i++) { tsc[Kinematics.LinearSpeed][i] = averagedVelocity[i]; tsc[Kinematics.LinearHorizontalVelocity][i] = averagedHorizontalVelocity[i]; tsc[Kinematics.LinearVerticalVelocity][i] = averagedVerticalVelocity[i]; } }
private void ComputeAngularVelocities(TrajectoryKinematics kinematics, CalibrationHelper calibrationHelper) { if (kinematics.Length <= 2) { PadAngularVelocities(kinematics); return; } for (int i = 1; i < kinematics.Length - 1; i++) { double d1 = GetDisplacementAngle(kinematics, i, i - 1); double d2 = GetDisplacementAngle(kinematics, i + 1, i); float time = calibrationHelper.GetTime(2); float inRadPerSecond = (float)((d1 + d2) / time); kinematics.AngularVelocity[i] = calibrationHelper.ConvertAngularVelocity(inRadPerSecond); kinematics.TangentialVelocity[i] = calibrationHelper.ConvertSpeed((float)(inRadPerSecond * kinematics.RotationRadius)); kinematics.CentripetalAcceleration[i] = calibrationHelper.ConvertAcceleration((float)(inRadPerSecond * inRadPerSecond * kinematics.RotationRadius)); } PadAngularVelocities(kinematics); }
private void ComputeVelocity(TimeSeriesCollection tsc, CalibrationHelper calibrationHelper) { if (tsc.Length <= 2) { PadVelocities(tsc); return; } for (int i = 1; i < tsc.Length - 1; i++) { float a1 = positions[i - 1]; float a2 = positions[i + 1]; float t = calibrationHelper.GetTime(2); float omega = (a2 - a1) / t; velocities[i] = omega; tsc[Kinematics.AngularVelocity][i] = (double)calibrationHelper.ConvertAngularVelocity(omega); float v = radii[i] * omega; tsc[Kinematics.TangentialVelocity][i] = (double)calibrationHelper.ConvertSpeed(v); } PadVelocities(tsc); }