public CPostScanConvertImage ScanConvert(CPreScanConvertImage preSCImage, UInt32 image_depth, Double xz_sector, Double yz_sector, Double r, bool enable_log_compression, UInt32 LC, Double referenceMaxVoxel)
{
UInt32 GSmax = 255; // Max greyscale value
// LC: Dynamic range to be visualized[dB]
Double gain = 0; // Brightness gain[dB]
// referenceMaxVoxel: if 0.0 use the brightest voxel of the image, else this value
Double image_upper_limit_N = 1; // Shallow trimming unsupported for now
Double image_lower_limit_N = Math.Round(r * 2 / probe.c * probe.fs);
// The pre-scan convert image has a different axis system (TODO change this nonsense):
// X = radius, Y = azimuth, Z = elevation
UInt32 original_depth = preSCImage.GetSizeX();
UInt32 original_width = preSCImage.GetSizeY();
UInt32 original_height = preSCImage.GetSizeZ();
// We need the width and height to be an odd number, to be symmetric around the central line of sight.
UInt32 half_image_width = Convert.ToUInt32(Math.Ceiling(image_depth * Math.Sin(xz_sector / 2)));
UInt32 image_width = 2 * half_image_width + 1; // new X axis
UInt32 half_image_height = Convert.ToUInt32(Math.Ceiling(image_depth * Math.Sin(yz_sector / 2)));
UInt32 image_height = 2 * half_image_height + 1; // new Y axis
CPostScanConvertImage image = new CPostScanConvertImage(image_width, image_height, image_depth);
// Since the image's axial resolution may not be based on the full
// available axial information, scale appropriately
double samples_per_depth = (image_lower_limit_N - image_upper_limit_N) / original_depth;
image_upper_limit_N = Math.Round(image_upper_limit_N / samples_per_depth) + 1;
image_lower_limit_N = Math.Round(image_lower_limit_N / samples_per_depth);
// Unless log compression is necessary, the scan conversion will operate on the input image.
CPreScanConvertImage inputImage = preSCImage;
// Adjust image brightness
if (enable_log_compression)
{
// Here, however, we must introduce a new temporary image.
inputImage = new CPreScanConvertImage(preSCImage.GetSizeX(), preSCImage.GetSizeY(), preSCImage.GetSizeZ());
Double im_max; // Max image amplitude for auto - gain
if (referenceMaxVoxel == 0.0)
{
im_max = preSCImage.GetMaxValue();
}
else
{
im_max = referenceMaxVoxel;
}
Double im_adj = im_max * Math.Pow(10, (-gain / 20));
for (UInt32 k = 0; k < original_depth; k++)
{
for (UInt32 j = 0; j < original_width; j++)
{
for (UInt32 i = 0; i < original_height; i++)
{
// log compress the demodulated image with top value at im_adj
inputImage.SetPixel(k, j, i, Math.Min(Math.Max(0, GSmax * (1.0 + (20.0 / LC * Math.Log10(Math.Max(1e-12, preSCImage.GetPixel(k, j, i) / im_adj))))), GSmax));
}
}
}
}
// Low - pass imaging filter cutoff frequency
// Double fs = probe.fs / samples_per_depth;
// TODO this comes straight from Matlab
// Double[] b_lp = { };
// Double[] a_lp = { };
//for (UInt32 j = 0; j < original_width; j++) // Azimuth lines
//{
// for (UInt32 i = 0; i < original_height; i++) // Elevation lines
// {
// Double[] image_line = new Double[original_depth];
// for (UInt32 k = 0; k < original_depth; k++)
// image_line[k] = preSCImage.GetPixel(k, j, i);
// Double[] filtered_image_line = new Double[original_depth];
// // DemodulateRFImageSimple(probe.f0, fs, image_line, b_lp, a_lp, ref filtered_image_line);
// for (UInt32 k = 0; k < original_depth; k++)
// preSCImage.SetPixel(k, j, i, filtered_image_line[k]);
// }
//}
// Color of the region outside the imaging cone. 127 (middle gray) is
// a good color as the image will be ranging from black to white.
UInt32 background_level = 127;
UInt32 old_x = inputImage.GetSizeX();
UInt32 old_y = inputImage.GetSizeY();
UInt32 old_z = inputImage.GetSizeZ();
var watch = System.Diagnostics.Stopwatch.StartNew();
Debug.WriteLine(string.Format("Scan converting {0} lines", image_depth));
Double xScaling = ((original_depth + image_upper_limit_N) / image_depth);
Double yScaling = ((original_width + 1) / xz_sector);
// If 2D imaging, yz_sector == 0, and zScaling is unused
Double zScaling = (yz_sector > 0 ? ((original_height + 1) / yz_sector) : 1);
for (Int32 new_z_index = 0; new_z_index < image_depth; new_z_index++)
{
for (Int32 new_y_index = 0; new_y_index < image_height; new_y_index++)
{
for (Int32 new_x_index = 0; new_x_index < image_width; new_x_index++)
{
Double xIndex = new_x_index - half_image_width;
Double yIndex = new_y_index - half_image_height;
Double zIndex = new_z_index;
Double old_x_location = Math.Sqrt(xIndex * xIndex + yIndex * yIndex + new_z_index * new_z_index) * xScaling;
Double old_y_location = ((xz_sector / 2) + Math.Atan(xIndex / Math.Sqrt(yIndex * yIndex + new_z_index * new_z_index))) * yScaling;
Double old_z_location = ((yz_sector / 2) + Math.Atan(yIndex / new_z_index)) * zScaling;
if (old_x_location >= old_x || old_y_location >= old_y || old_z_location >= old_z || old_x_location < 1 || old_y_location < 1 || old_z_location < 0)
{
image.SetPixel(Convert.ToUInt32(new_x_index), Convert.ToUInt32(new_y_index), Convert.ToUInt32(new_z_index), background_level);
}
else
{
UInt32 old_x_index = Convert.ToUInt32(Math.Floor(old_x_location));
UInt32 old_y_index = Convert.ToUInt32(Math.Floor(old_y_location));
UInt32 old_z_index = Convert.ToUInt32(Math.Floor(old_z_location));
// Get the eight nearest points to(x, y, z) with wrap-around
// Normally old_z_index >= 1, but since in the 2D case old_z_index == 0,
// adjust the code to tolerate this event (becomes bilinear interpolation)
Double c000 = inputImage.GetPixel(old_x_index - 1, old_y_index - 1, (uint)Math.Max(0, (int)old_z_index - 1));
Double c100 = inputImage.GetPixel(old_x_index, old_y_index - 1, (uint)Math.Max(0, (int)old_z_index - 1));
Double c010 = inputImage.GetPixel(old_x_index - 1, old_y_index, (uint)Math.Max(0, (int)old_z_index - 1));
Double c110 = inputImage.GetPixel(old_x_index, old_y_index, (uint)Math.Max(0, (int)old_z_index - 1));
Double c001 = inputImage.GetPixel(old_x_index - 1, old_y_index - 1, old_z_index);
Double c101 = inputImage.GetPixel(old_x_index, old_y_index - 1, old_z_index);
Double c011 = inputImage.GetPixel(old_x_index - 1, old_y_index, old_z_index);
Double c111 = inputImage.GetPixel(old_x_index, old_y_index, old_z_index);
// Interpolate over them
Double InterpVal = trilinearInterpolation(c000, c100, c010, c110, c001, c101, c011, c111, old_x_location - old_x_index, old_y_location - old_y_index, old_z_location - old_z_index);
image.SetPixel(Convert.ToUInt32(new_x_index), Convert.ToUInt32(new_y_index), Convert.ToUInt32(new_z_index), InterpVal);
}
}
}
}
watch.Stop();
Debug.WriteLine(string.Format("Scan conversion took {0} ms", watch.ElapsedMilliseconds));
return(image);
}
public Bitmap ScanConvertBitmap(CPreScanConvertImage preSCImage, UInt32 image_depth, Double xz_sector, Double yz_sector, Double r, bool enable_log_compression, Int32 x_cut, Int32 y_cut, Int32 z_cut, UInt32 LC, Double referenceMaxVoxel)
{
if ((x_cut < 0 && y_cut < 0 && z_cut < 0) || (x_cut >= 0 && y_cut >= 0) || (x_cut >= 0 && z_cut >= 0) || (y_cut >= 0 && z_cut >= 0))
{
throw new System.ArgumentException("Please define one and only one axis on which to provide a cut");
}
UInt32 GSmax = 255; // Max greyscale value
// LC: Dynamic range to be visualized[dB]
Double gain = 0; // Brightness gain[dB]
// referenceMaxVoxel: if 0.0 use the brightest voxel of the image, else this value
Double image_upper_limit_N = 1; // Shallow trimming unsupported for now
Double image_lower_limit_N = Math.Round(r * 2 / probe.c * probe.fs);
// The pre-scan convert image has a different axis system (TODO change this nonsense):
// X = radius, Y = azimuth, Z = elevation
UInt32 original_depth = preSCImage.GetSizeX();
UInt32 original_width = preSCImage.GetSizeY();
UInt32 original_height = preSCImage.GetSizeZ();
// We need the width and height to be an odd number, to be symmetric around the central line of sight.
UInt32 half_image_width = Convert.ToUInt32(Math.Ceiling(image_depth * Math.Sin(xz_sector / 2)));
UInt32 image_width = 2 * half_image_width + 1; // X axis
UInt32 half_image_height = Convert.ToUInt32(Math.Ceiling(image_depth * Math.Sin(yz_sector / 2)));
UInt32 image_height = 2 * half_image_height + 1; // Y axis
// Since the image's axial resolution may not be based on the full
// available axial information, scale appropriately
double samples_per_depth = (image_lower_limit_N - image_upper_limit_N) / original_depth;
image_upper_limit_N = Math.Round(image_upper_limit_N / samples_per_depth) + 1;
image_lower_limit_N = Math.Round(image_lower_limit_N / samples_per_depth);
// Unless log compression is necessary, the scan conversion will operate on the input image.
CPreScanConvertImage inputImage = preSCImage;
// Adjust image brightness
if (enable_log_compression)
{
// Here, however, we must introduce a new temporary image.
inputImage = new CPreScanConvertImage(preSCImage.GetSizeX(), preSCImage.GetSizeY(), preSCImage.GetSizeZ());
Double im_max; // Max image amplitude for auto - gain
if (referenceMaxVoxel == 0.0)
{
im_max = preSCImage.GetMaxValue();
}
else
{
im_max = referenceMaxVoxel;
}
double im_adj = im_max * Math.Pow(10, (-gain / 20));
// Safety clause just in case the returned image is all black
if (im_adj == 0)
{
im_adj = 1;
}
for (UInt32 k = 0; k < original_depth; k++)
{
for (UInt32 j = 0; j < original_width; j++)
{
for (UInt32 i = 0; i < original_height; i++)
{
// log compress the demodulated image with top value at im_adj
inputImage.SetPixel(k, j, i, Math.Min(Math.Max(0, GSmax * (1.0 + (20.0 / LC * Math.Log10(Math.Max(1e-12, preSCImage.GetPixel(k, j, i) / im_adj))))), GSmax));
}
}
}
}
// Color of the region outside the imaging cone. 127 (middle gray) is
// a good color as the image will be ranging from black to white.
UInt32 background_level = 127;
UInt32 old_x = inputImage.GetSizeX();
UInt32 old_y = inputImage.GetSizeY();
UInt32 old_z = inputImage.GetSizeZ();
Double xScaling = ((original_depth + image_upper_limit_N) / image_depth);
Double yScaling = ((original_width + 1) / xz_sector);
// If 2D imaging, yz_sector == 0, and zScaling is unused
Double zScaling = (yz_sector > 0 ? ((original_height + 1) / yz_sector) : 1);
Int32 size1 = 0, size2 = 0;
Int32 min_x, max_x, min_y, max_y, min_z, max_z;
if (x_cut >= 0)
{
if (yz_sector > 0)
{
size1 = Convert.ToInt32(image_height);
}
// If 2D imaging, forcefully widen the image canvas into a square (it will just stay black)
else
{
size1 = Convert.ToInt32(image_width);
}
size2 = Convert.ToInt32(image_depth);
min_x = x_cut;
max_x = x_cut + 1;
min_y = 0;
max_y = Convert.ToInt32(image_height);
min_z = 0;
max_z = Convert.ToInt32(image_depth);
}
else if (y_cut >= 0)
{
size1 = Convert.ToInt32(image_width);
size2 = Convert.ToInt32(image_depth);
min_x = 0;
max_x = Convert.ToInt32(image_width);
min_y = y_cut;
max_y = y_cut + 1;
min_z = 0;
max_z = Convert.ToInt32(image_depth);
}
else // z_cut >= 0
{
size1 = Convert.ToInt32(image_width);
if (yz_sector > 0)
{
size2 = Convert.ToInt32(image_height);
}
// If 2D imaging, forcefully widen the image canvas into a square (it will just stay black)
else
{
size2 = Convert.ToInt32(image_width);
}
min_x = 0;
max_x = Convert.ToInt32(image_width);
min_y = 0;
max_y = Convert.ToInt32(image_height);
min_z = z_cut;
max_z = z_cut + 1;
}
Double [,] scImage = new Double[size1, size2];
System.Drawing.Bitmap bmp = new Bitmap(size1, size2, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
for (Int32 new_z_index = min_z; new_z_index < max_z; new_z_index++)
{
for (Int32 new_y_index = min_y; new_y_index < max_y; new_y_index++)
{
for (Int32 new_x_index = min_x; new_x_index < max_x; new_x_index++)
{
Double xIndex = new_x_index - half_image_width;
Double yIndex = new_y_index - half_image_height;
Double zIndex = new_z_index;
Double old_x_location = Math.Sqrt(xIndex * xIndex + yIndex * yIndex + new_z_index * new_z_index) * xScaling;
Double old_y_location = ((xz_sector / 2) + Math.Atan(xIndex / Math.Sqrt(yIndex * yIndex + new_z_index * new_z_index))) * yScaling;
Double old_z_location = ((yz_sector / 2) + Math.Atan(yIndex / new_z_index)) * zScaling;
if (old_x_location >= old_x || old_y_location >= old_y || old_z_location >= old_z || old_x_location < 1 || old_y_location < 1 || old_z_location < 0)
{
if (x_cut >= 0)
{
scImage[new_y_index, new_z_index] = background_level;
}
else if (y_cut >= 0)
{
scImage[new_x_index, new_z_index] = background_level;
}
else // z_cut >= 0
{
scImage[new_x_index, new_y_index] = background_level;
}
}
else
{
UInt32 old_x_index = Convert.ToUInt32(Math.Floor(old_x_location));
UInt32 old_y_index = Convert.ToUInt32(Math.Floor(old_y_location));
UInt32 old_z_index = Convert.ToUInt32(Math.Floor(old_z_location));
// Get the eight nearest points to(x, y, z) with wrap-around
// Normally old_z_index >= 1, but since in the 2D case old_z_index == 0,
// adjust the code to tolerate this event (becomes bilinear interpolation)
Double c000 = inputImage.GetPixel(old_x_index - 1, old_y_index - 1, (uint)Math.Max(0, (int)old_z_index - 1));
Double c100 = inputImage.GetPixel(old_x_index, old_y_index - 1, (uint)Math.Max(0, (int)old_z_index - 1));
Double c010 = inputImage.GetPixel(old_x_index - 1, old_y_index, (uint)Math.Max(0, (int)old_z_index - 1));
Double c110 = inputImage.GetPixel(old_x_index, old_y_index, (uint)Math.Max(0, (int)old_z_index - 1));
Double c001 = inputImage.GetPixel(old_x_index - 1, old_y_index - 1, old_z_index);
Double c101 = inputImage.GetPixel(old_x_index, old_y_index - 1, old_z_index);
Double c011 = inputImage.GetPixel(old_x_index - 1, old_y_index, old_z_index);
Double c111 = inputImage.GetPixel(old_x_index, old_y_index, old_z_index);
// Interpolate over them
Double InterpVal = trilinearInterpolation(c000, c100, c010, c110, c001, c101, c011, c111, old_x_location - old_x_index, old_y_location - old_y_index, old_z_location - old_z_index);
if (x_cut >= 0)
{
scImage[new_y_index, new_z_index] = InterpVal;
}
else if (y_cut >= 0)
{
scImage[new_x_index, new_z_index] = InterpVal;
}
else // z_cut >= 0
{
scImage[new_x_index, new_y_index] = InterpVal;
}
}
}
}
}
return(imageSliceToBitmap(scImage));
}
