private void SpectraWorker_DoWork(object sender, DoWorkEventArgs e)
{
if (input.Width != input.Height)
{
throw new System.ApplicationException(
"The image height and width must be the same.");
}
SpectraWorker.ReportProgress(0, "Computing spectra");
// The AForge FFT requires an 8 bits per pixel input format.
Bitmap gray_8bpp
= AForge.Imaging.Filters.Grayscale.CommonAlgorithms.Y.Apply(input);
AForge.Imaging.ComplexImage fft
= ComplexImage.FromBitmap(gray_8bpp);
fft.ForwardFourierTransform();
SpectraWorker.ReportProgress(100, "Fourier Spectra Calculated.");
fourier = fft.ToBitmap();
}
private static Bitmap GetSalMap(Bitmap sr, double[,] phase)
{
AForge.Imaging.ComplexImage totalSpec = AForge.Imaging.ComplexImage.FromBitmap(sr);
// exp(SR + 1i * Phase)
for (int x = 0; x < IMAGE_SIZE_X; x++)
{
for (int y = 0; y < IMAGE_SIZE_Y; y++)
{
totalSpec.Data[x, y].Im = phase[x, y];
totalSpec.Data[x, y] = Complex.Exp(totalSpec.Data[x, y]);
}
}
totalSpec.ForwardFourierTransform();
// .^2
for (int x = 0; x < IMAGE_SIZE_X; x++)
{
for (int y = 0; y < IMAGE_SIZE_Y; y++)
{
totalSpec.Data[x, y] =
Complex.Multiply(totalSpec.Data[x, y], totalSpec.Data[x, y]);
}
}
// shift
Complex[,] shifted = Shift(totalSpec.Data, IMAGE_SIZE_X, IMAGE_SIZE_Y);
for (int x = 0; x < IMAGE_SIZE_X; x++)
{
for (int y = 0; y < IMAGE_SIZE_Y; y++)
{
totalSpec.Data[x, y] = shifted[x, y];
}
}
return(totalSpec.ToBitmap());
}
public Bitmap ImagenCompleja()
{
cimage = ComplexImage.FromBitmap(imagen);
cimage.ForwardFourierTransform();
imagen = cimage.ToBitmap();
return imagen;
}
