/// <summary>
/// Evaluates the spatial frequency and temporal frequency resolved reflectance
/// calculating the Fourier transform of the NURBS curve R(t) at the
/// required spatial frequency for the specified optical properties.
/// The computed FT is analitycal or discrete according to the boolean value 'analyticIntegration'.
/// </summary>
/// <param name="ops">optical properties</param>
/// <param name="fxs">spatial frequency</param>
/// <param name="fts">temporal frequancy</param>
/// <returns>spatial frequency and temporal frequancy resolved reflectance</returns>
public override IEnumerable <Complex> ROfFxAndFt(IEnumerable <OpticalProperties> ops, IEnumerable <double> fxs, IEnumerable <double> fts)
{
bool analyticIntegration = false;
double fx_ref;
Complex transformedValue;
foreach (var op in ops)
{
if (analyticIntegration)
{
foreach (var fx in fxs)
{
fx_ref = fx * _opReference.Musp / op.Musp;
double exponentialterm = op.Mua * v * _opReference.Musp / op.Musp;
if (fx_ref <= _sfdGenerator.SpaceValues.MaxValue)
{
foreach (var ft in fts)
{
transformedValue = _sfdGenerator.EvaluateNurbsCurveFourierTransform(fx_ref, exponentialterm, ft * _opReference.Musp / op.Musp);
yield return(Math.PI * transformedValue);
}
}
else
{
foreach (var ft in fts)
{
yield return(new Complex(0.0, 0.0));
}
}
}
}
else
{
var time = _sfdGenerator.TimeKnotSpanPolynomialCoefficients.Select(span => span.GetKnotSpanMidTime());
var deltaT = _sfdGenerator.TimeKnotSpanPolynomialCoefficients.Select(span => span.GetKnotSpanDeltaT());
foreach (var fx in fxs)
{
fx_ref = fx * op.Musp / _opReference.Musp;
if (fx_ref <= _sfdGenerator.SpaceValues.MaxValue)
{
var ROfT = ROfFxAndTime(op.AsEnumerable(), fx_ref.AsEnumerable(), time);
foreach (var ft in fts)
{
yield return(LinearDiscreteFourierTransform.GetFourierTransform(time.ToArray(), ROfT.ToArray(), deltaT.ToArray(), ft * _opReference.Musp / op.Musp));
}
}
else
{
foreach (var ft in fts)
{
yield return(new Complex(0.0, 0.0));
}
}
}
}
}
}
/// <summary>
/// Evaluates the temporal frequency and space resolved reflectance at a source
/// detector separation rho for a modulation frequency ft,for the specified
/// optical properties. It calculates the Fourier transform of the NURBS
/// curve R(t) at the required source detector separation.
/// The used FT is analitycal or discrete according to the boolean value 'analyticIntegration'.
/// </summary>
/// <param name="ops">optical properties</param>
/// <param name="rhos">source detector separation</param>
/// <param name="fts">modulation frequency</param>
/// <returns>reflectance intensity</returns>
public override IEnumerable <Complex> ROfRhoAndFt(IEnumerable <OpticalProperties> ops, IEnumerable <double> rhos, IEnumerable <double> fts)
{
bool analyticIntegration = false;
double rho_ref;
foreach (var op in ops)
{
if (analyticIntegration)
{
foreach (var rho in rhos)
{
double exponentialTerm = op.Mua * v * _opReference.Musp / op.Musp;
rho_ref = rho * op.Musp / _opReference.Musp;
if (rho_ref <= _rdGenerator.SpaceValues.MaxValue)
{
foreach (var ft in fts)
{
yield return(GetScalingFactor(op, 2) * _rdGenerator.EvaluateNurbsCurveFourierTransform(rho_ref, exponentialTerm, ft * _opReference.Musp / op.Musp));
}
}
else
{
foreach (var ft in fts)
{
yield return(new Complex(0.0, 0.0));
}
}
}
}
else
{
//var time = _rdGenerator.NativeTimes;
var time = _rdGenerator.NativeTimes.ToArray();
for (int i = 0; i < time.Length; i++)
{
time[i] = time[i] * _opReference.Musp / op.Musp;
}
var deltaT = GetDeltaT(time);
foreach (var rho in rhos)
{
if (rho * _opReference.Musp / op.Musp <= _rdGenerator.SpaceValues.MaxValue)
{
var ROfT = ROfRhoAndTime(op.AsEnumerable(), rho.AsEnumerable(), time);
foreach (var ft in fts)
{
yield return(LinearDiscreteFourierTransform.GetFourierTransform(time.ToArray(), ROfT.ToArray(), deltaT.ToArray(), ft));
}
}
else
{
foreach (var ft in fts)
{
yield return(new Complex(0.0, 0.0));
}
}
}
}
}
}