public static void GenerateSerialCDExample(string simulatedLocation, string outputFolder)
{
var data = MeasurementData.LoadSimulatedPoints(simulatedLocation);
var cellSize = 1.0 / 3600.0 * Math.PI / 180.0;
var c = new GriddingConstants(data.VisibilitiesCount, 256, 8, 4, 512, (float)cellSize, 1, 0.0);
var metadata = Partitioner.CreatePartition(c, data.UVW, data.Frequencies);
var psfGrid = IDG.GridPSF(c, metadata, data.UVW, data.Flags, data.Frequencies);
var psf = FFT.BackwardFloat(psfGrid, c.VisibilitiesCount);
FFT.Shift(psf);
var corrKernel = PSF.CalcPaddedFourierCorrelation(psf, new Rectangle(0, 0, c.GridSize, c.GridSize));
Directory.CreateDirectory(outputFolder);
var reconstruction = new float[c.GridSize, c.GridSize];
var residualVis = data.Visibilities;
var totalSize = new Rectangle(0, 0, c.GridSize, c.GridSize);
var fastCD = new FastSerialCD(totalSize, psf);
var lambda = 0.50f * fastCD.MaxLipschitz;
var alpha = 0.2f;
for (int cycle = 0; cycle < 100; cycle++)
{
var dirtyGrid = IDG.Grid(c, metadata, residualVis, data.UVW, data.Frequencies);
var dirtyImage = FFT.BackwardFloat(dirtyGrid, c.VisibilitiesCount);
FFT.Shift(dirtyImage);
var gradients = Residuals.CalcGradientMap(dirtyImage, corrKernel, totalSize);
Tools.WriteToMeltCSV(Common.PSF.Cut(reconstruction), Path.Combine(outputFolder, "model_CD_" + cycle + ".csv"));
Tools.WriteToMeltCSV(gradients, Path.Combine(outputFolder, "gradients_CD_" + cycle + ".csv"));
fastCD.Deconvolve(reconstruction, gradients, lambda, alpha, 4);
FFT.Shift(reconstruction);
var xGrid = FFT.Forward(reconstruction);
FFT.Shift(reconstruction);
var modelVis = IDG.DeGrid(c, metadata, xGrid, data.UVW, data.Frequencies);
residualVis = Visibilities.Substract(data.Visibilities, modelVis, data.Flags);
}
}
public static void GeneratePSFs(string simulatedLocation, string outputFolder)
{
var data = MeasurementData.LoadSimulatedPoints(simulatedLocation);
var c = MeasurementData.CreateSimulatedStandardParams(data.VisibilitiesCount);
var metadata = Partitioner.CreatePartition(c, data.UVW, data.Frequencies);
var psfGrid = IDG.GridPSF(c, metadata, data.UVW, data.Flags, data.Frequencies);
var psf = FFT.BackwardFloat(psfGrid, c.VisibilitiesCount);
FFT.Shift(psf);
Directory.CreateDirectory(outputFolder);
var maskedPsf = Copy(psf);
Tools.Mask(maskedPsf, 2);
var reverseMasked = Copy(psf);
Tools.ReverseMask(reverseMasked, 2);
var psf2 = PSF.CalcPSFSquared(psf);
var psf2Cut = PSF.CalcPSFSquared(maskedPsf);
Tools.WriteToMeltCSV(psf, Path.Combine(outputFolder, "psf.csv"));
Tools.WriteToMeltCSV(maskedPsf, Path.Combine(outputFolder, "psfCut.csv"));
Tools.WriteToMeltCSV(reverseMasked, Path.Combine(outputFolder, "psfReverseCut.csv"));
Tools.WriteToMeltCSV(psf2, Path.Combine(outputFolder, "psfSquared.csv"));
Tools.WriteToMeltCSV(psf2Cut, Path.Combine(outputFolder, "psfSquaredCut.csv"));
var x = new float[c.GridSize, c.GridSize];
x[10, 10] = 1.0f;
var convKernel = PSF.CalcPaddedFourierConvolution(psf, new Rectangle(0, 0, c.GridSize, c.GridSize));
var corrKernel = PSF.CalcPaddedFourierCorrelation(psf, new Rectangle(0, 0, c.GridSize, c.GridSize));
using (var convolver = new PaddedConvolver(convKernel, new Rectangle(0, 0, c.GridSize, c.GridSize)))
using (var correlator = new PaddedConvolver(corrKernel, new Rectangle(0, 0, c.GridSize, c.GridSize)))
{
var zeroPadded = convolver.Convolve(x);
var psf2Edge = correlator.Convolve(zeroPadded);
Tools.WriteToMeltCSV(zeroPadded, Path.Combine(outputFolder, "psfZeroPadding.csv"));
Tools.WriteToMeltCSV(psf2Edge, Path.Combine(outputFolder, "psfSquaredEdge.csv"));
}
convKernel = PSF.CalcPaddedFourierConvolution(psf, new Rectangle(0, 0, 0, 0));
using (var convolver = new PaddedConvolver(convKernel, new Rectangle(0, 0, 0, 0)))
Tools.WriteToMeltCSV(convolver.Convolve(x), Path.Combine(outputFolder, "psfCircular.csv"));
//================================================= Reconstruct =============================================================
var totalSize = new Rectangle(0, 0, c.GridSize, c.GridSize);
var reconstruction = new float[c.GridSize, c.GridSize];
var fastCD = new FastSerialCD(totalSize, psf);
var lambda = 0.50f * fastCD.MaxLipschitz;
var alpha = 0.2f;
var residualVis = data.Visibilities;
for (int cycle = 0; cycle < 5; cycle++)
{
Console.WriteLine("in cycle " + cycle);
var dirtyGrid = IDG.Grid(c, metadata, residualVis, data.UVW, data.Frequencies);
var dirtyImage = FFT.BackwardFloat(dirtyGrid, c.VisibilitiesCount);
FFT.Shift(dirtyImage);
var gradients = Residuals.CalcGradientMap(dirtyImage, corrKernel, totalSize);
if (cycle == 0)
{
Tools.WriteToMeltCSV(dirtyImage, Path.Combine(outputFolder, "dirty.csv"));
Tools.WriteToMeltCSV(gradients, Path.Combine(outputFolder, "gradients.csv"));
}
fastCD.Deconvolve(reconstruction, gradients, lambda, alpha, 10000, 1e-5f);
FFT.Shift(reconstruction);
var xGrid = FFT.Forward(reconstruction);
FFT.Shift(reconstruction);
var modelVis = IDG.DeGrid(c, metadata, xGrid, data.UVW, data.Frequencies);
residualVis = Visibilities.Substract(data.Visibilities, modelVis, data.Flags);
}
//FitsIO.Write(reconstruction, Path.Combine(outputFolder,"xImage.fits"));
Tools.WriteToMeltCSV(reconstruction, Path.Combine(outputFolder, "elasticNet.csv"));
}
public static void GenerateCLEANExample(string simulatedLocation, string outputFolder)
{
var data = MeasurementData.LoadSimulatedPoints(simulatedLocation);
var cellSize = 1.0 / 3600.0 * Math.PI / 180.0;
var c = new GriddingConstants(data.VisibilitiesCount, 256, 8, 4, 512, (float)cellSize, 1, 0.0);
var metadata = Partitioner.CreatePartition(c, data.UVW, data.Frequencies);
var psfGrid = IDG.GridPSF(c, metadata, data.UVW, data.Flags, data.Frequencies);
var psf = FFT.BackwardFloat(psfGrid, c.VisibilitiesCount);
FFT.Shift(psf);
Directory.CreateDirectory(outputFolder);
var reconstruction = new float[c.GridSize, c.GridSize];
var residualVis = data.Visibilities;
for (int cycle = 0; cycle < 10; cycle++)
{
Console.WriteLine("in cycle " + cycle);
var dirtyGrid = IDG.Grid(c, metadata, residualVis, data.UVW, data.Frequencies);
var dirtyImage = FFT.BackwardFloat(dirtyGrid, c.VisibilitiesCount);
FFT.Shift(dirtyImage);
//FitsIO.Write(dirtyImage, Path.Combine(outputFolder, "dirty_CLEAN_" + cycle + ".fits"));
Tools.WriteToMeltCSV(dirtyImage, Path.Combine(outputFolder, "dirty_CLEAN_" + cycle + ".csv"));
var maxY = -1;
var maxX = -1;
var max = 0.0f;
for (int y = 0; y < dirtyImage.GetLength(0); y++)
{
for (int x = 0; x < dirtyImage.GetLength(1); x++)
{
if (max < Math.Abs(dirtyImage[y, x]))
{
maxY = y;
maxX = x;
max = Math.Abs(dirtyImage[y, x]);
}
}
}
//FitsIO.Write(reconstruction, Path.Combine(outputFolder, "model_CLEAN_" + cycle + ".fits"));
Tools.WriteToMeltCSV(PSF.Cut(reconstruction), Path.Combine(outputFolder, "model_CLEAN_" + cycle + ".csv"));
reconstruction[maxY, maxX] += 0.5f * dirtyImage[maxY, maxX];
FFT.Shift(reconstruction);
var xGrid = FFT.Forward(reconstruction);
FFT.Shift(reconstruction);
var modelVis = IDG.DeGrid(c, metadata, xGrid, data.UVW, data.Frequencies);
residualVis = Visibilities.Substract(data.Visibilities, modelVis, data.Flags);
}
var cleanbeam = new float[c.GridSize, c.GridSize];
var x0 = c.GridSize / 2;
var y0 = c.GridSize / 2;
for (int y = 0; y < cleanbeam.GetLength(0); y++)
{
for (int x = 0; x < cleanbeam.GetLength(1); x++)
{
cleanbeam[y, x] = (float)(1.0 * Math.Exp(-(Math.Pow(x0 - x, 2) / 16 + Math.Pow(y0 - y, 2) / 16)));
}
}
FitsIO.Write(cleanbeam, Path.Combine(outputFolder, "clbeam.fits"));
FFT.Shift(cleanbeam);
var CL = FFT.Forward(cleanbeam);
var REC = FFT.Forward(reconstruction);
var CONF = Common.Fourier2D.Multiply(REC, CL);
var cleaned = FFT.BackwardFloat(CONF, reconstruction.Length);
//FFT.Shift(cleaned);
//FitsIO.Write(cleaned, Path.Combine(outputFolder, "rec_CLEAN.fits"));
Tools.WriteToMeltCSV(PSF.Cut(cleaned), Path.Combine(outputFolder, "rec_CLEAN.csv"));
}