private string GetReductionMethodDisplayName(TangraConfig.PhotometryReductionMethod method)
{
switch (method)
{
case TangraConfig.PhotometryReductionMethod.AperturePhotometry:
return("Aperture Photometry");
case TangraConfig.PhotometryReductionMethod.OptimalExtraction:
return("Optimal Extraction");
case TangraConfig.PhotometryReductionMethod.PsfPhotometry:
return("Numerical Psf Photometry");
}
return("N/A");
}
private PhotometryReductionMethod ConvertSignalMethod(TangraConfig.PhotometryReductionMethod method)
{
switch (method)
{
case TangraConfig.PhotometryReductionMethod.AperturePhotometry:
return(PhotometryReductionMethod.AperturePhotometry);
case TangraConfig.PhotometryReductionMethod.PsfPhotometry:
return(PhotometryReductionMethod.PsfPhotometry);
case TangraConfig.PhotometryReductionMethod.OptimalExtraction:
return(PhotometryReductionMethod.OptimalExtraction);
default:
return(PhotometryReductionMethod.Unknown);
}
}
public void SetComboboxIndexFromPhotometryReductionMethod(TangraConfig.PhotometryReductionMethod method)
{
switch (method)
{
case TangraConfig.PhotometryReductionMethod.AperturePhotometry:
cbxReductionType.SelectedIndex = 0;
break;
case TangraConfig.PhotometryReductionMethod.PsfPhotometry:
cbxReductionType.SelectedIndex = 1;
break;
case TangraConfig.PhotometryReductionMethod.OptimalExtraction:
cbxReductionType.SelectedIndex = 2;
break;
}
}
private void SetMeasurementMethods()
{
if (cbMeaMethod.SelectedIndex == 0)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMedian;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.AperturePhotometry;
}
else if (cbMeaMethod.SelectedIndex == 1)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.AverageBackground;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.AperturePhotometry;
}
else if (cbMeaMethod.SelectedIndex == 2)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMode;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.AperturePhotometry;
}
else if (cbMeaMethod.SelectedIndex == 3)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.PSFBackground;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
else if (cbMeaMethod.SelectedIndex == 4)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMedian;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
else if (cbMeaMethod.SelectedIndex == 5)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.AverageBackground;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
else if (cbMeaMethod.SelectedIndex == 6)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMode;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
}
private NotMeasuredReasons MeasureObject(
IImagePixel center,
uint[,] data,
uint[,] backgroundPixels,
int bpp,
MeasurementsHelper measurer,
TangraConfig.PreProcessingFilter filter,
TangraConfig.PhotometryReductionMethod reductionMethod,
TangraConfig.PsfQuadrature psfQuadrature,
TangraConfig.PsfFittingMethod psfFittngMethod,
float aperture,
double refinedFWHM,
float refinedAverageFWHM,
IMeasurableObject measurableObject,
IImagePixel[] groupCenters,
float[] aperturesInGroup,
bool fullDisappearance
)
{
return(measurer.MeasureObject(
center, data, backgroundPixels, bpp, filter, reductionMethod, psfQuadrature, psfFittngMethod,
aperture, refinedFWHM, refinedAverageFWHM, measurableObject, groupCenters, aperturesInGroup, fullDisappearance));
}
public StarMagnitudeFit(
AstroImage astroImage,
int bitPix,
List<double> intencities,
List<double> magnitudes,
List<double> colours,
List<IStar> starNumbers,
List<PSFFit> psfGaussians,
List<double> profileFittedAmplitudes,
List<bool> saturatedFlags,
double a, double b, double c, float encodingGamma, TangraConfig.KnownCameraResponse reverseCameraResponse, int excludedStars,
TangraConfig.PreProcessingFilter filter, double empericalFWHM,
TangraConfig.PhotometryReductionMethod photometryReductionMethod,
TangraConfig.BackgroundMethod photometryBackgroundMethod,
TangraConfig.PsfQuadrature psfQuadrature,
TangraConfig.PsfFittingMethod psfFittingMethod,
MeasurementsHelper measurer,
float? aperture)
{
m_CurrentAstroImage = astroImage;
m_BitPix = bitPix;
m_Intencities = intencities;
m_Magnitudes = magnitudes;
m_Colours = colours;
m_Residuals = new List<double>();
m_StarNumbers = starNumbers;
m_PSFGaussians = psfGaussians;
m_EncodingGamma = encodingGamma;
m_ReverseCameraResponse = reverseCameraResponse;
m_ExcludedStars = excludedStars;
m_SaturatedFlags = saturatedFlags;
m_ProfileFittedAmplitudes = profileFittedAmplitudes;
m_Sigma = 0;
for (int i = 0; i < intencities.Count; i++)
{
double computed = a * -2.5 * Math.Log10(intencities[i]) + b * colours[i] + c;
double diff = Math.Abs(computed - magnitudes[i]);
m_Residuals.Add(diff);
m_Sigma += diff*diff;
}
m_Sigma = Math.Sqrt(m_Sigma / (m_Residuals.Count - 1));
m_Filter = filter;
m_EmpericalFWHM = empericalFWHM;
m_PhotometryReductionMethod = photometryReductionMethod;
m_PhotometryBackgroundMethod = photometryBackgroundMethod;
m_PsfQuadrature = psfQuadrature;
m_PsfFittingMethod = psfFittingMethod;
m_A = a;
m_B = b;
m_C = c;
m_Measurer = measurer.Clone();
m_MeasurementAperture = aperture;
m_Sigma = 0;
m_MinRes = double.MaxValue;
m_MaxRes = double.MinValue;
m_MinMag = double.MaxValue;
m_MaxMag = double.MinValue;
for (int i = 0; i < m_Residuals.Count; i++)
{
double res = m_Residuals[i];
m_Sigma += res * res;
if (m_MinRes > res) m_MinRes = res;
if (m_MaxRes < res) m_MaxRes = res;
double mag = m_Magnitudes[i];
if (m_MinMag > mag) m_MinMag = mag;
if (m_MaxMag < mag) m_MaxMag = mag;
}
m_Sigma = Math.Sqrt(m_Sigma / m_Residuals.Count);
}
public Bitmap ResolveObjects(
TangraConfig.PhotometryReductionMethod photometryReductionMethod,
TangraConfig.PsfQuadrature psfQuadrature,
TangraConfig.PsfFittingMethod psfFittingMethod,
TangraConfig.BackgroundMethod backgroundMethod,
TangraConfig.PreProcessingFilter filter,
Guid magnitudeBandId,
Rectangle osdRectangleToExclude,
Rectangle rectToInclude,
bool limitByInclusion,
IAstrometrySettings astrometrySettings,
ObjectResolverSettings objectResolverSettings)
{
m_AstrometrySettings = astrometrySettings;
StarMap starMap = new StarMap(
astrometrySettings.PyramidRemoveNonStellarObject,
astrometrySettings.MinReferenceStarFWHM,
astrometrySettings.MaxReferenceStarFWHM,
astrometrySettings.MaximumPSFElongation,
astrometrySettings.LimitReferenceStarDetection);
starMap.FindBestMap(StarMapInternalConfig.Default, m_Image, osdRectangleToExclude, rectToInclude, limitByInclusion);
float r0 = 0;
m_MagnitudeFit = StarMagnitudeFit.PerformFit(
m_AstrometryController,
m_VideoController,
m_Image.Pixelmap.BitPixCamera,
m_Image.Pixelmap.MaxSignalValue,
m_Astrometry.FitInfo,
photometryReductionMethod,
psfQuadrature,
psfFittingMethod,
backgroundMethod,
filter,
m_Stars,
magnitudeBandId,
1.0f,
TangraConfig.KnownCameraResponse.Undefined,
null, null, null,
ref r0);
m_BackgroundFlux = m_MagnitudeFit.GetBackgroundIntencity();
m_BackgroundMag = m_MagnitudeFit.GetMagnitudeForIntencity(m_BackgroundFlux);
if (TangraConfig.Settings.TraceLevels.PlateSolving.TraceVerbose())
{
Trace.WriteLine(string.Format("Plate FWHM: {0}", 2 * Math.Sqrt(Math.Log(2)) * r0));
}
PeakPixelResolver resolver = new PeakPixelResolver(m_Image);
resolver.ResolvePeakPixels(osdRectangleToExclude, rectToInclude, limitByInclusion, objectResolverSettings.ExcludeEdgeAreaPixels, objectResolverSettings.MinDistanceBetweenPeakPixels);
List <double> identifiedMagnitudes = new List <double>();
List <double> identifiedR0s = new List <double>();
m_IdentifiedObjects.Clear();
m_UidentifiedObjects.Clear();
foreach (KeyValuePair <int, int> peakPixel in resolver.PeakPixels.Keys)
{
int x = peakPixel.Key;
int y = peakPixel.Value;
bool isSaturated;
double intencity = m_MagnitudeFit.GetIntencity(new ImagePixel(255, x, y), out isSaturated);
double magnitude = m_MagnitudeFit.GetMagnitudeForIntencity(intencity);
if (magnitude < m_MaxMagForAstrometry)
{
double RADeg, DEDeg;
PSFFit fit;
starMap.GetPSFFit(x, y, PSFFittingMethod.NonLinearFit, out fit);
if (fit.IMax < 0)
{
continue;
}
if (fit.IMax < fit.I0)
{
continue;
}
if (fit.Certainty < objectResolverSettings.MinCertainty)
{
continue;
}
if (fit.FWHM < objectResolverSettings.MinFWHM)
{
continue;
}
if (fit.IMax - fit.I0 < objectResolverSettings.MinAmplitude)
{
continue;
}
m_Astrometry.GetRADEFromImageCoords(fit.XCenter, fit.YCenter, out RADeg, out DEDeg);
// All stars closer than 2 arcsec to this position
List <IStar> matchingStars = m_Stars.Where(s => Math.Abs(AngleUtility.Elongation(s.RADeg, s.DEDeg, RADeg, DEDeg) * 3600.0) < objectResolverSettings.MaxStarMatchMagDif).ToList();
bool identified = false;
if (matchingStars.Count >= 1)
{
foreach (IStar star in matchingStars)
{
if (objectResolverSettings.MaxStarMatchMagDif >= Math.Abs(magnitude - star.Mag))
{
// The star is identified. Do we care more?
if (TangraConfig.Settings.TraceLevels.PlateSolving.TraceVerbose())
{
Trace.WriteLine(string.Format("STAR ({0}, {1}) No -> {2}; Mag -> {3} (Expected: {4}); R0 = {5}",
x, y, star.StarNo, magnitude.ToString("0.00"), star.Mag.ToString("0.00"), fit.R0.ToString("0.0")));
}
identifiedMagnitudes.Add(magnitude);
identifiedR0s.Add(fit.R0);
m_IdentifiedObjects.Add(fit, star);
identified = true;
break;
}
}
}
if (matchingStars.Count == 0 ||
!identified)
{
// The object is not in the star database
// TODO: Test for hot pixel. Match to hot pixel profile from the brightest pixel in the area
m_UidentifiedObjects.Add(fit, magnitude);
}
}
else
{
// Don't bother with too faint objects
}
}
if (m_IdentifiedObjects.Count > 0)
{
double mean = identifiedR0s.Average();
double variance = 0;
foreach (double rr0 in identifiedR0s)
{
variance += (rr0 - mean) * (rr0 - mean);
}
variance = Math.Sqrt(variance / (m_IdentifiedObjects.Count - 1));
double minR0 = mean - variance;
double maxR0 = mean + variance;
identifiedMagnitudes.Sort();
double maxStarMag = identifiedMagnitudes[Math.Max(0, (int)Math.Truncate(0.9 * identifiedMagnitudes.Count))];
if (TangraConfig.Settings.TraceLevels.PlateSolving.TraceVerbose())
{
Trace.WriteLine(string.Format("Max Star Mag: {0}; R0 ({1}, {2})", maxStarMag.ToString("0.00"), minR0.ToString("0.0"), maxR0.ToString("0.0")));
}
// NOTE: The R0 exclusion may ignore bright comets !
m_UnknownObjects = m_UidentifiedObjects
.Where(p => p.Value < maxStarMag && p.Key.R0 >= minR0 && p.Key.R0 <= maxR0)
.ToDictionary(p => p.Key, p => p.Value);
if (TangraConfig.Settings.TraceLevels.PlateSolving.TraceVerbose())
{
foreach (PSFFit obj in m_UnknownObjects.Keys)
{
Trace.WriteLine(string.Format("UNK: ({0}, {1}) Mag -> {2}; R0 = {3}", obj.XCenter.ToString("0.0"), obj.YCenter.ToString("0.0"), m_UnknownObjects[obj].ToString("0.00"), obj.R0.ToString("0.0")));
}
}
}
Bitmap bitmap = m_Image.Pixelmap.CreateDisplayBitmapDoNotDispose();
using (Graphics g = Graphics.FromImage(bitmap))
{
foreach (PSFFit star in m_IdentifiedObjects.Keys)
{
float x = (float)star.XCenter;
float y = (float)star.YCenter;
g.DrawEllipse(Pens.GreenYellow, x - 5, y - 5, 10, 10);
}
foreach (PSFFit star in m_UnknownObjects.Keys)
{
float x = (float)star.XCenter;
float y = (float)star.YCenter;
g.DrawEllipse(Pens.Tomato, x - 8, y - 8, 16, 16);
}
g.Save();
}
return(bitmap);
}
public StarMagnitudeFit(
AstroImage astroImage,
int bitPix,
List <double> intencities,
List <double> magnitudes,
List <double> colours,
List <IStar> starNumbers,
List <PSFFit> psfGaussians,
List <double> profileFittedAmplitudes,
List <bool> saturatedFlags,
double a, double b, double c, float encodingGamma, TangraConfig.KnownCameraResponse reverseCameraResponse, int excludedStars,
TangraConfig.PreProcessingFilter filter, double empericalFWHM,
TangraConfig.PhotometryReductionMethod photometryReductionMethod,
TangraConfig.BackgroundMethod photometryBackgroundMethod,
TangraConfig.PsfQuadrature psfQuadrature,
TangraConfig.PsfFittingMethod psfFittingMethod,
MeasurementsHelper measurer,
float?aperture)
{
m_CurrentAstroImage = astroImage;
m_BitPix = bitPix;
m_Intencities = intencities;
m_Magnitudes = magnitudes;
m_Colours = colours;
m_Residuals = new List <double>();
m_StarNumbers = starNumbers;
m_PSFGaussians = psfGaussians;
m_EncodingGamma = encodingGamma;
m_ReverseCameraResponse = reverseCameraResponse;
m_ExcludedStars = excludedStars;
m_SaturatedFlags = saturatedFlags;
m_ProfileFittedAmplitudes = profileFittedAmplitudes;
m_Sigma = 0;
for (int i = 0; i < intencities.Count; i++)
{
double computed = a * -2.5 * Math.Log10(intencities[i]) + b * colours[i] + c;
double diff = Math.Abs(computed - magnitudes[i]);
m_Residuals.Add(diff);
m_Sigma += diff * diff;
}
m_Sigma = Math.Sqrt(m_Sigma / (m_Residuals.Count - 1));
m_Filter = filter;
m_EmpericalFWHM = empericalFWHM;
m_PhotometryReductionMethod = photometryReductionMethod;
m_PhotometryBackgroundMethod = photometryBackgroundMethod;
m_PsfQuadrature = psfQuadrature;
m_PsfFittingMethod = psfFittingMethod;
m_A = a;
m_B = b;
m_C = c;
m_Measurer = measurer.Clone();
m_MeasurementAperture = aperture;
m_Sigma = 0;
m_MinRes = double.MaxValue;
m_MaxRes = double.MinValue;
m_MinMag = double.MaxValue;
m_MaxMag = double.MinValue;
for (int i = 0; i < m_Residuals.Count; i++)
{
double res = m_Residuals[i];
m_Sigma += res * res;
if (m_MinRes > res)
{
m_MinRes = res;
}
if (m_MaxRes < res)
{
m_MaxRes = res;
}
double mag = m_Magnitudes[i];
if (m_MinMag > mag)
{
m_MinMag = mag;
}
if (m_MaxMag < mag)
{
m_MaxMag = mag;
}
}
m_Sigma = Math.Sqrt(m_Sigma / m_Residuals.Count);
}
public static StarMagnitudeFit PerformFit(
IAstrometryController astrometryController,
IVideoController videoController,
int bitPix,
uint maxSignalValue,
FitInfo astrometricFit,
TangraConfig.PhotometryReductionMethod photometryReductionMethod,
TangraConfig.PsfQuadrature psfQuadrature,
TangraConfig.PsfFittingMethod psfFittingMethod,
TangraConfig.BackgroundMethod photometryBackgroundMethod,
TangraConfig.PreProcessingFilter filter,
List <IStar> catalogueStars,
Guid magnitudeBandId,
float encodingGamma,
TangraConfig.KnownCameraResponse reverseCameraResponse,
float?aperture,
float?annulusInnerRadius,
int?annulusMinPixels,
ref float empericalPSFR0)
{
uint saturatedValue = TangraConfig.Settings.Photometry.Saturation.GetSaturationForBpp(bitPix, maxSignalValue);
MeasurementsHelper measurer = new MeasurementsHelper(
bitPix,
photometryBackgroundMethod,
TangraConfig.Settings.Photometry.SubPixelSquareSize,
saturatedValue);
measurer.SetCoreProperties(
annulusInnerRadius ?? TangraConfig.Settings.Photometry.AnnulusInnerRadius,
annulusMinPixels ?? TangraConfig.Settings.Photometry.AnnulusMinPixels,
CorePhotometrySettings.Default.RejectionBackgroundPixelsStdDev,
2 /* TODO: This must be configurable */);
var bgProvider = new BackgroundProvider(videoController);
measurer.GetImagePixelsCallback += new MeasurementsHelper.GetImagePixelsDelegate(bgProvider.measurer_GetImagePixelsCallback);
List <double> intencities = new List <double>();
List <double> magnitudes = new List <double>();
List <double> colours = new List <double>();
List <double> residuals = new List <double>();
List <bool> saturatedFlags = new List <bool>();
List <IStar> stars = new List <IStar>();
List <PSFFit> gaussians = new List <PSFFit>();
List <MagFitRecord> fitRecords = new List <MagFitRecord>();
AstroImage currentAstroImage = videoController.GetCurrentAstroImage(false);
Rectangle osdRectToExclude = astrometryController.OSDRectToExclude;
Rectangle rectToInclude = astrometryController.RectToInclude;
bool limitByInclusion = astrometryController.LimitByInclusion;
int matSize = CorePhotometrySettings.Default.MatrixSizeForCalibratedPhotometry;
double a = double.NaN;
double b = double.NaN;
double c = double.NaN;
int excludedStars = 0;
double empericalFWHM = double.NaN;
try
{
foreach (PlateConstStarPair pair in astrometricFit.AllStarPairs)
{
if (limitByInclusion && !rectToInclude.Contains((int)pair.x, (int)pair.y))
{
continue;
}
if (!limitByInclusion && osdRectToExclude.Contains((int)pair.x, (int)pair.y))
{
continue;
}
IStar star = catalogueStars.Find(s => s.StarNo == pair.StarNo);
if (star == null || double.IsNaN(star.Mag) || star.Mag == 0)
{
continue;
}
uint[,] data = currentAstroImage.GetMeasurableAreaPixels((int)pair.x, (int)pair.y, matSize);
PSFFit fit = new PSFFit((int)pair.x, (int)pair.y);
fit.Fit(data, PSF_FIT_AREA_SIZE);
if (!fit.IsSolved)
{
continue;
}
MagFitRecord record = new MagFitRecord();
record.Star = star;
record.Pair = pair;
record.PsfFit = fit;
record.Saturation = IsSaturated(data, matSize, saturatedValue);
if (!EXCLUDE_SATURATED_STARS || !record.Saturation)
{
fitRecords.Add(record);
}
}
// We need the average R0 if it hasn't been determined yet
if (float.IsNaN(empericalPSFR0))
{
empericalPSFR0 = 0;
foreach (MagFitRecord rec in fitRecords)
{
empericalPSFR0 += (float)rec.PsfFit.R0;
}
empericalPSFR0 /= fitRecords.Count;
}
empericalFWHM = 2 * Math.Sqrt(Math.Log(2)) * empericalPSFR0;
foreach (MagFitRecord record in fitRecords)
{
ImagePixel center = new ImagePixel(255, record.Pair.x, record.Pair.y);
int areaSize = filter == TangraConfig.PreProcessingFilter.NoFilter ? 17 : 19;
int centerX = (int)Math.Round(center.XDouble);
int centerY = (int)Math.Round(center.YDouble);
uint[,] data = currentAstroImage.GetMeasurableAreaPixels(centerX, centerY, areaSize);
uint[,] backgroundPixels = currentAstroImage.GetMeasurableAreaPixels(centerX, centerY, 35);
measurer.MeasureObject(
center,
data,
backgroundPixels,
currentAstroImage.Pixelmap.BitPixCamera,
filter,
photometryReductionMethod,
psfQuadrature,
psfFittingMethod,
aperture != null ? aperture.Value : (float)Aperture(record.PsfFit.FWHM),
record.PsfFit.FWHM,
(float)empericalFWHM,
new FakeIMeasuredObject(record.PsfFit),
null,
null,
false);
double intensity = measurer.TotalReading - measurer.TotalBackground;
if (intensity > 0)
{
var mag = record.Star.GetMagnitudeForBand(magnitudeBandId);
var clr = record.Star.MagJ - record.Star.MagK;
if (!double.IsNaN(mag) && !double.IsNaN(clr) && !double.IsInfinity(mag) && !double.IsInfinity(clr))
{
intencities.Add(intensity);
magnitudes.Add(record.Star.GetMagnitudeForBand(magnitudeBandId));
colours.Add(record.Star.MagJ - record.Star.MagK);
gaussians.Add(record.PsfFit);
stars.Add(record.Star);
saturatedFlags.Add(measurer.HasSaturatedPixels || record.PsfFit.IMax >= measurer.SaturationValue);
}
}
}
// Remove stars with unusual PSF fit radii (once only)
double sum = 0;
for (int i = 0; i < gaussians.Count; i++)
{
sum += gaussians[i].R0;
}
double averageR = sum / gaussians.Count;
residuals.Clear();
sum = 0;
for (int i = 0; i < gaussians.Count; i++)
{
residuals.Add(averageR - gaussians[i].R0);
sum += (averageR - gaussians[i].R0) * (averageR - gaussians[i].R0);
}
double stdDev = Math.Sqrt(sum) / gaussians.Count;
if (EXCLUDE_BAD_RESIDUALS)
{
for (int i = residuals.Count - 1; i >= 0; i--)
{
if (Math.Abs(residuals[i]) > 6 * stdDev)
{
intencities.RemoveAt(i);
magnitudes.RemoveAt(i);
colours.RemoveAt(i);
stars.RemoveAt(i);
gaussians.RemoveAt(i);
saturatedFlags.RemoveAt(i);
}
}
}
double maxResidual = Math.Max(0.1, TangraConfig.Settings.Photometry.MaxResidualStellarMags);
for (int itter = 1; itter <= MAX_ITERR; itter++)
{
residuals.Clear();
SafeMatrix A = new SafeMatrix(intencities.Count, 3);
SafeMatrix X = new SafeMatrix(intencities.Count, 1);
int idx = 0;
for (int i = 0; i < intencities.Count; i++)
{
A[idx, 0] = magnitudes[i];
A[idx, 1] = colours[i];
A[idx, 2] = 1;
X[idx, 0] = -2.5 * Math.Log10(intencities[i]);
idx++;
}
SafeMatrix a_T = A.Transpose();
SafeMatrix aa = a_T * A;
SafeMatrix aa_inv = aa.Inverse();
SafeMatrix bx = (aa_inv * a_T) * X;
double Ka = bx[0, 0];
double Kb = bx[1, 0];
double Kc = bx[2, 0];
// -2.5 * a * Log(Median-Intensity) = A * Mv + B * Mjk + C - b
// -2.5 * Log(Median-Intensity) = Ka * Mv + Kb * Mjk + Kc
// Mv = -2.5 * a * Log(Median-Intensity) - b * Mjk - c
a = 1 / Ka;
b = -Kb / Ka;
c = -Kc / Ka;
int starsExcludedThisTime = 0;
if (EXCLUDE_BAD_RESIDUALS)
{
List <int> indexesToRemove = new List <int>();
for (int i = 0; i < intencities.Count; i++)
{
double computed = a * -2.5 * Math.Log10(intencities[i]) + b * colours[i] + c;
double diff = Math.Abs(computed - magnitudes[i]);
if (itter < MAX_ITERR)
{
if (Math.Abs(diff) > maxResidual)
{
indexesToRemove.Add(i);
}
}
else
{
residuals.Add(diff);
}
}
for (int i = indexesToRemove.Count - 1; i >= 0; i--)
{
int idxToRemove = indexesToRemove[i];
intencities.RemoveAt(idxToRemove);
magnitudes.RemoveAt(idxToRemove);
colours.RemoveAt(idxToRemove);
stars.RemoveAt(idxToRemove);
gaussians.RemoveAt(idxToRemove);
saturatedFlags.RemoveAt(idxToRemove);
excludedStars++;
starsExcludedThisTime++;
}
}
if (starsExcludedThisTime == 0)
{
break;
}
}
}
catch (Exception ex)
{
Trace.WriteLine(ex.ToString());
}
return(new StarMagnitudeFit(
currentAstroImage,
bitPix,
intencities, magnitudes, colours, stars, gaussians, new List <double>(),
saturatedFlags, a, b, c, encodingGamma, reverseCameraResponse, excludedStars, filter, empericalFWHM,
photometryReductionMethod, photometryBackgroundMethod, psfQuadrature, psfFittingMethod, measurer, aperture));
}
private void SetMeasurementMethods()
{
if (cbMeaMethod.SelectedIndex == 0)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMedian;
m_SignalMethod = TangraConfig.PhotometryReductionMethod. AperturePhotometry;
}
else if (cbMeaMethod.SelectedIndex == 1)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.AverageBackground;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.AperturePhotometry;
}
else if (cbMeaMethod.SelectedIndex == 2)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMode;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.AperturePhotometry;
}
else if (cbMeaMethod.SelectedIndex == 3)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.PSFBackground;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
else if (cbMeaMethod.SelectedIndex == 4)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMedian;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
else if (cbMeaMethod.SelectedIndex == 5)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.AverageBackground;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
else if (cbMeaMethod.SelectedIndex == 6)
{
m_BackgroundMethod = TangraConfig.BackgroundMethod.BackgroundMode;
m_SignalMethod = TangraConfig.PhotometryReductionMethod.PsfPhotometry;
}
}
public NotMeasuredReasons MeasureObject(
IImagePixel center,
uint[,] data,
uint[,] backgroundPixels,
int bpp,
TangraConfig.PreProcessingFilter filter,
TangraConfig.PhotometryReductionMethod reductionMethod,
TangraConfig.PsfQuadrature psfQuadrature,
TangraConfig.PsfFittingMethod psfFittingMethod,
float aperture,
double refinedFWHM,
float refinedAverageFWHM,
IMeasurableObject measurableObject,
IImagePixel[] objectsInGroup,
float[] aperturesInGroup,
bool fullDisappearance)
{
// NOTE: This is how the center of the pixel area passed in data and background arrays is determined
// TODO: Pass the center as an argument
int centerX = (int)Math.Round(center.XDouble);
int centerY = (int)Math.Round(center.YDouble);
float msrX0 = (float)center.XDouble;
float msrY0 = (float)center.YDouble;
float bgAnnulusFactor = 1;
switch (filter)
{
case TangraConfig.PreProcessingFilter.LowPassFilter:
data = ImageFilters.LowPassFilter(data, bpp, true);
backgroundPixels = ImageFilters.LowPassFilter(backgroundPixels, bpp, true);
break;
case TangraConfig.PreProcessingFilter.LowPassDifferenceFilter:
data = ImageFilters.LowPassDifferenceFilter(data, bpp, true);
backgroundPixels = ImageFilters.LowPassDifferenceFilter(backgroundPixels, bpp, true);
break;
default:
break;
}
float modelFWHM = float.NaN;
if (psfFittingMethod == TangraConfig.PsfFittingMethod.LinearFitOfAveragedModel)
{
if (TangraConfig.Settings.Photometry.UseUserSpecifiedFWHM)
{
modelFWHM = TangraConfig.Settings.Photometry.UserSpecifiedFWHM;
}
else
{
modelFWHM = refinedAverageFWHM;
}
}
DoublePSFFit doublefit = null;
PSFFit fit = null;
IBackgroundModelProvider backgroundModel = null;
// 1 - Fit a PSF to the current obejct
if (objectsInGroup != null && objectsInGroup.Length == 2)
{
// 1A - When this is a star group
int x1 = (int)Math.Round((data.GetLength(0) / 2) + objectsInGroup[0].XDouble - center.XDouble);
int y1 = (int)Math.Round((data.GetLength(0) / 2) + objectsInGroup[0].YDouble - center.YDouble);
int x2 = (int)Math.Round((data.GetLength(0) / 2) + objectsInGroup[1].XDouble - center.XDouble);
int y2 = (int)Math.Round((data.GetLength(0) / 2) + objectsInGroup[1].YDouble - center.YDouble);
doublefit = new DoublePSFFit(centerX, centerY);
if (psfFittingMethod == TangraConfig.PsfFittingMethod.LinearFitOfAveragedModel &&
!float.IsNaN(modelFWHM))
{
doublefit.FittingMethod = PSFFittingMethod.LinearFitOfAveragedModel;
doublefit.SetAveragedModelFWHM(modelFWHM);
}
doublefit.Fit(data, x1, y1, x2, y2);
PSFFit star1 = doublefit.GetGaussian1();
PSFFit star2 = doublefit.GetGaussian2();
if (m_BackgroundMethod == TangraConfig.BackgroundMethod.Background3DPolynomial)
{
var bg3dFit = new Background3DPolynomialFit();
bg3dFit.Fit(data, star1, star2);
doublefit.Fit(data, bg3dFit, x1, y1, x2, y2);
star1 = doublefit.GetGaussian1();
star2 = doublefit.GetGaussian2();
backgroundModel = bg3dFit;
}
double d1 = ImagePixel.ComputeDistance(measurableObject.Center.XDouble, doublefit.X1Center, measurableObject.Center.YDouble, doublefit.Y1Center);
double d2 = ImagePixel.ComputeDistance(measurableObject.Center.XDouble, doublefit.X2Center, measurableObject.Center.YDouble, doublefit.Y2Center);
fit = (d1 < d2) ? star1 : star2;
if (reductionMethod == TangraConfig.PhotometryReductionMethod.AperturePhotometry)
{
// NOTE: If aperture photometry is used, we measure the double object in a single larger aperture centered at the middle
double alpha = Math.Atan((star2.YCenter - star1.YCenter) / (star2.XCenter - star1.XCenter));
float dx = (float)((star1.FWHM - star2.FWHM) * Math.Cos(alpha));
float dy = (float)((star1.FWHM - star2.FWHM) * Math.Sin(alpha));
msrX0 = (float)(star1.XCenter - star1.FWHM + star2.XCenter + star2.FWHM) / 2.0f - dx;
msrY0 = (float)(star1.YCenter - star1.FWHM + star2.YCenter + star2.FWHM) / 2.0f - dy;
aperture = aperturesInGroup.Sum();
bgAnnulusFactor = 0.67f;
}
}
else if (reductionMethod != TangraConfig.PhotometryReductionMethod.AperturePhotometry)
{
// 1B - When this is a single star
fit = new PSFFit(centerX, centerY);
if (psfFittingMethod == TangraConfig.PsfFittingMethod.LinearFitOfAveragedModel &&
!float.IsNaN(modelFWHM))
{
fit.FittingMethod = PSFFittingMethod.LinearFitOfAveragedModel;
fit.SetAveragedModelFWHM(modelFWHM);
}
fit.Fit(data, measurableObject.PsfFittingMatrixSize);
if (m_BackgroundMethod == TangraConfig.BackgroundMethod.Background3DPolynomial)
{
// If 3D Poly Background is used then fit the background, and supply it to the PSF Fitting
var bg3dFit = new Background3DPolynomialFit();
bg3dFit.Fit(backgroundPixels, fit, null);
backgroundModel = bg3dFit;
if (psfFittingMethod != TangraConfig.PsfFittingMethod.LinearFitOfAveragedModel)
{
/* 3D Poly modelling works in a direct fit only with non-linear fitting */
fit.Fit(backgroundPixels, bg3dFit, measurableObject.PsfFittingMatrixSize);
}
}
}
else if (
reductionMethod == TangraConfig.PhotometryReductionMethod.AperturePhotometry &&
m_BackgroundMethod == TangraConfig.BackgroundMethod.Background3DPolynomial)
{
// 1C - Single star with aperture photometry and 3D Poly Background
var bg3dFit = new Background3DPolynomialFit();
bg3dFit.Fit(backgroundPixels, (float)(centerX - msrX0 + 17), (float)(centerY - msrY0 + 17), 2 * aperture);
backgroundModel = bg3dFit;
}
// 2 - Do the actual photometric measurements (signal and background) based on the selected methods
if (reductionMethod == TangraConfig.PhotometryReductionMethod.PsfPhotometry)
{
// 2A - PSF Photometry
if (TangraConfig.Settings.Photometry.PsfFittingMethod == TangraConfig.PsfFittingMethod.DirectNonLinearFit)
{
return(DoNonLinearProfileFittingPhotometry(
fit,
data, centerX, centerY, msrX0, msrY0,
aperture,
measurableObject.PsfFittingMatrixSize,
psfQuadrature == TangraConfig.PsfQuadrature.NumericalInAperture,
measurableObject.IsOccultedStar && fullDisappearance,
backgroundPixels,
measurableObject.MayHaveDisappeared,
refinedFWHM,
bgAnnulusFactor));
}
else if (psfFittingMethod == TangraConfig.PsfFittingMethod.LinearFitOfAveragedModel)
{
return(DoLinearProfileFittingOfAveragedMoodelPhotometry(
fit,
data, centerX, centerY, msrX0, msrY0, modelFWHM,
aperture,
measurableObject.PsfFittingMatrixSize,
psfQuadrature == TangraConfig.PsfQuadrature.NumericalInAperture,
measurableObject.IsOccultedStar && fullDisappearance,
backgroundPixels,
measurableObject.MayHaveDisappeared,
bgAnnulusFactor, backgroundModel));
}
else
{
throw new NotImplementedException();
}
}
else if (reductionMethod == TangraConfig.PhotometryReductionMethod.AperturePhotometry)
{
return(DoAperturePhotometry(
data, centerX, centerY, msrX0, msrY0,
aperture,
measurableObject.PsfFittingMatrixSize,
backgroundPixels, bgAnnulusFactor, backgroundModel,
measurableObject.Center.X, measurableObject.Center.Y));
}
else if (reductionMethod == TangraConfig.PhotometryReductionMethod.OptimalExtraction)
{
return(DoOptimalExtractionPhotometry(
fit,
data, centerX, centerY, msrX0, msrY0,
aperture,
measurableObject.PsfFittingMatrixSize,
measurableObject.IsOccultedStar && fullDisappearance,
backgroundPixels,
measurableObject.MayHaveDisappeared,
refinedFWHM, bgAnnulusFactor));
}
else
{
throw new ArgumentOutOfRangeException("reductionMethod");
}
}
