public void Init(Stream fileStream)
{
InitializeDicom();
file = new BinaryReader(fileStream);
location = 0; // Reset the location
dicomInfo.Clear();
try
{
bool readResult = ReadFileInfo();
if (readResult && widthTagFound && heightTagFound && pixelDataTagFound)
{
ReadPixels();
if (dicmFound == true)
{
typeofDicomFile = TypeOfDicomFile.Dicom3File;
}
else
{
typeofDicomFile = TypeOfDicomFile.DicomOldTypeFile;
}
}
}
catch
{
// Nothing here
}
finally
{
file.Close();
}
}
public DicomDecoder(DicomDecoder dicomDecoder, List <byte> pixels24)
{
CopyFromClone(dicomDecoder);
_pixels24 = pixels24;
_typeofDicomFile = dicomDecoder._typeofDicomFile;
_PixelsHaveBeenRead = true;
}
public DicomDecoder(DicomDecoder dicomDecoder, List <List <ushort> > newPixels)
{
CopyFromClone(dicomDecoder);
_pixels16 = newPixels;
_typeofDicomFile = dicomDecoder._typeofDicomFile;
_PixelsHaveBeenRead = true;
}
private BitmapSource ReadDicomFile(string fileName, int minWin, int maxWin)
{
dd.DicomFileName = fileName;
List <ushort> pixels16 = new List <ushort>();
int imageWidth;
int imageHeight;
int bitDepth;
int samplesPerPixel;
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
if (typeOfDicomFile == TypeOfDicomFile.Dicom3File || typeOfDicomFile == TypeOfDicomFile.DicomOldTypeFile)
{
imageWidth = dd.width;
imageHeight = dd.height;
bitDepth = dd.bitsAllocated;
samplesPerPixel = dd.samplesPerPixel;
if (samplesPerPixel == 1 && bitDepth == 16)
{
pixels16.Clear();
dd.GetPixels16(ref pixels16);
return(BitmapHelper.ToBitmapImage(pixels16.ToArray(), imageWidth, imageHeight, minWin, maxWin));
}
else
{
MessageBox.Show("Unsupported bits per pixel number (only 16bpp supported)");
}
}
else
{
if (typeOfDicomFile == TypeOfDicomFile.DicomUnknownTransferSyntax)
{
MessageBox.Show("Invalid dicom file");
}
else
{
MessageBox.Show("Invalid file");
}
return(null);
}
return(null);
}
public void LoadDicomFromStream(byte[] fileContents)
{
try
{
if (DicomFileName == "")
{
DicomFileName = "NOTSET";
}
InitializeDicom();
MemoryStream stream = new MemoryStream(fileContents);
file = new BinaryReader(stream);
//file = new BinaryReader(File.Open(DicomFileName, FileMode.Open, FileAccess.Read));
location = 0; // Reset the location
_dicomInfo.Clear();
bool readResult = ReadFileInfo();
if (readResult && _widthTagFound && _heightTagFound && _pixelDataTagFound)
{
if (_dicmFound == true)
{
_typeofDicomFile = TypeOfDicomFile.Dicom3File;
}
else
{
_typeofDicomFile = TypeOfDicomFile.DicomOldTypeFile;
}
ReadPixels();
}
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.ToString());
}
finally
{
if (file != null)
{
file.Close();
}
}
}
public void SetDicomFileName(String filename, bool lazyLoad = false)
{
try
{
DicomFileName = filename;
InitializeDicom();
// Thanks to CodeProject member Alphons van der Heijden for
// suggesting to add this - FileAccess.Read (July 2010)
file = new BinaryReader(File.Open(DicomFileName, FileMode.Open, FileAccess.Read));
location = 0; // Reset the location
_dicomInfo.Clear();
bool readResult = ReadFileInfo();
if (readResult && _widthTagFound && _heightTagFound && _pixelDataTagFound)
{
if (_dicmFound == true)
{
_typeofDicomFile = TypeOfDicomFile.Dicom3File;
}
else
{
_typeofDicomFile = TypeOfDicomFile.DicomOldTypeFile;
}
if (!lazyLoad)
{
ReadPixels();
}
}
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.ToString());
}
finally
{
if (file != null)
{
file.Close();
}
}
}
void InitializeDicom()
{
bitsAllocated = 0;
width = 1;
height = 1;
offset = 1;
nImages = 1;
samplesPerPixel = 1;
photoInterpretation = "";
unit = "mm";
windowCentre = 0;
windowWidth = 0;
signedImage = false;
widthTagFound = false;
heightTagFound = false;
pixelDataTagFound = false;
rescaleIntercept = 0.0; // Default value
rescaleSlope = 1.0; // Default value
typeofDicomFile = TypeOfDicomFile.NotDicom;
}
void InitializeDicom()
{
_bitsAllocated = 0;
_imageWidth = 1;
_imageHeight = 1;
_offset = 1;
_nImages = 1;
_samplesPerPixel = 1;
_photoInterpretation = "";
_unit = "mm";
_windowCentre = 0;
_windowWidth = 0;
_signedImage = false;
_widthTagFound = false;
_heightTagFound = false;
_pixelDataTagFound = false;
_rescaleIntercept = 0.0; // Default value
_rescaleSlope = 1.0; // Default value
_pixels16 = new List <List <ushort> >();
_typeofDicomFile = TypeOfDicomFile.NotDicom;
_PixelsHaveBeenRead = false;
}
public bool ReadFileInfo()
{
long skipCount = Convert.ToInt32(ID_OFFSET);
bitsAllocated = 16;
file.BaseStream.Seek(skipCount, SeekOrigin.Begin);
location += ID_OFFSET;
if (GetString(4) != DICM)
{
// This is for reading older DICOM files (Before 3.0)
// Seek from the beginning of the file
file.BaseStream.Seek(0, SeekOrigin.Begin);
location = 0;
// Older DICOM files do not have the preamble and prefix
dicmFound = false;
// Continue reading further.
// See whether the width, height and pixel data tags
// are present. If these tags are present, then it we conclude that this is a
// DICOM file, because all DICOM files should have at least these three tags.
// Otherwise, it is not a DICOM file.
}
else
{
// We have a DICOM 3.0 file
dicmFound = true;
}
bool decodingTags = true;
samplesPerPixel = 1;
int planarConfiguration = 0;
photoInterpretation = "";
string modality;
while (decodingTags)
{
int tag = GetNextTag();
if ((location & 1) != 0)
oddLocations = true;
if (inSequence)
{
AddInfo(tag, null);
continue;
}
string s;
switch (tag)
{
case (int)(TRANSFER_SYNTAX_UID):
s = GetString(elementLength);
AddInfo(tag, s);
if (s.IndexOf("1.2.4") > -1 || s.IndexOf("1.2.5") > -1)
{
file.Close();
typeofDicomFile = TypeOfDicomFile.DicomUnknownTransferSyntax;
// Return gracefully indicating that this type of
// Transfer Syntax cannot be handled
return false;
}
if (s.IndexOf("1.2.840.10008.1.2.2") >= 0)
bigEndianTransferSyntax = true;
break;
case (int)MODALITY:
modality = GetString(elementLength);
AddInfo(tag, modality);
break;
case (int)(NUMBER_OF_FRAMES):
s = GetString(elementLength);
AddInfo(tag, s);
double frames = Convert.ToDouble(s, new CultureInfo("en-US"));
if (frames > 1.0)
nImages = (int)frames;
break;
case (int)(SAMPLES_PER_PIXEL):
samplesPerPixel = GetShort();
AddInfo(tag, samplesPerPixel);
break;
case (int)(PHOTOMETRIC_INTERPRETATION):
photoInterpretation = GetString(elementLength);
photoInterpretation = photoInterpretation.Trim();
AddInfo(tag, photoInterpretation);
break;
case (int)(PLANAR_CONFIGURATION):
planarConfiguration = GetShort();
AddInfo(tag, planarConfiguration);
break;
case (int)(ROWS):
height = GetShort();
AddInfo(tag, height);
heightTagFound = true;
break;
case (int)(COLUMNS):
width = GetShort();
AddInfo(tag, width);
widthTagFound = true;
break;
case (int)(PIXEL_SPACING):
String scale = GetString(elementLength);
GetSpatialScale(scale);
AddInfo(tag, scale);
break;
case (int)(SLICE_THICKNESS):
case (int)(SLICE_SPACING):
String spacing = GetString(elementLength);
pixelDepth = Convert.ToDouble(spacing, new CultureInfo("en-US"));
AddInfo(tag, spacing);
break;
case (int)(BITS_ALLOCATED):
bitsAllocated = GetShort();
AddInfo(tag, bitsAllocated);
break;
case (int)(PIXEL_REPRESENTATION):
pixelRepresentation = GetShort();
AddInfo(tag, pixelRepresentation);
break;
case (int)(WINDOW_CENTER):
String center = GetString(elementLength);
int index = center.IndexOf('\\');
if (index != -1) center = center.Substring(index + 1);
windowCentre = Convert.ToDouble(center, new CultureInfo("en-US"));
AddInfo(tag, center);
break;
case (int)(WINDOW_WIDTH):
String widthS = GetString(elementLength);
index = widthS.IndexOf('\\');
if (index != -1) widthS = widthS.Substring(index + 1);
windowWidth = Convert.ToDouble(widthS, new CultureInfo("en-US"));
AddInfo(tag, widthS);
break;
case (int)(RESCALE_INTERCEPT):
String intercept = GetString(elementLength);
rescaleIntercept = Convert.ToDouble(intercept, new CultureInfo("en-US"));
AddInfo(tag, intercept);
break;
case (int)(RESCALE_SLOPE):
String slop = GetString(elementLength);
rescaleSlope = Convert.ToDouble(slop, new CultureInfo("en-US"));
AddInfo(tag, slop);
break;
case (int)(RED_PALETTE):
reds = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(GREEN_PALETTE):
greens = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(BLUE_PALETTE):
blues = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(PIXEL_DATA):
// Start of image data...
if (elementLength != 0)
{
offset = location;
AddInfo(tag, location);
decodingTags = false;
}
else
AddInfo(tag, null);
pixelDataTagFound = true;
break;
default:
AddInfo(tag, null);
break;
}
}
return true;
}
private BitmapSource ReadDicomFile(string fileName, out int minWin, out int maxWin)
{
dd.DicomFileName = fileName;
List <ushort> pixels16 = new List <ushort>();
int imageWidth;
int imageHeight;
int bitDepth;
int samplesPerPixel;
double winCentre;
double winWidth;
maxWin = 0;
minWin = 0;
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
if (typeOfDicomFile == TypeOfDicomFile.Dicom3File || typeOfDicomFile == TypeOfDicomFile.DicomOldTypeFile)
{
imageWidth = dd.width;
imageHeight = dd.height;
bitDepth = dd.bitsAllocated;
winCentre = dd.windowCentre;
winWidth = dd.windowWidth;
samplesPerPixel = dd.samplesPerPixel;
if (samplesPerPixel == 1 && bitDepth == 16)
{
pixels16.Clear();
dd.GetPixels16(ref pixels16);
int minPixelValue = pixels16.Min();
int maxPixelValue = pixels16.Max();
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
maxWin = Convert.ToInt32(winCentre + 0.5 * winWidth);
minWin = maxWin - Convert.ToInt32(winWidth);
return(BitmapHelper.ToBitmapImage(pixels16.ToArray(), imageWidth, imageHeight, minWin, maxWin));
}
else
{
MessageBox.Show("Unsupported bits per pixel number (only 16bpp supported)");
}
}
else
{
if (typeOfDicomFile == TypeOfDicomFile.DicomUnknownTransferSyntax)
{
MessageBox.Show("Invalid dicom file");
}
else
{
MessageBox.Show("Invalid file");
}
return(null);
}
return(null);
}
public bool ReadFileInfo()
{
long skipCount = Convert.ToInt32(ID_OFFSET);
bitsAllocated = 16;
file.BaseStream.Seek(skipCount, SeekOrigin.Begin);
location += ID_OFFSET;
if (GetString(4) != DICM)
{
file.BaseStream.Seek(0, SeekOrigin.Begin);
location = 0;
dicmFound = false;
}
else
{
dicmFound = true;
}
bool decodingTags = true;
samplesPerPixel = 1;
int planarConfiguration = 0;
photoInterpretation = "";
string modality;
while (decodingTags)
{
int tag = GetNextTag();
if ((location & 1) != 0)
{
oddLocations = true;
}
if (inSequence)
{
AddInfo(tag, null);
continue;
}
string s;
switch (tag)
{
case (int)(TRANSFER_SYNTAX_UID):
s = GetString(elementLength);
AddInfo(tag, s);
if (s.IndexOf("1.2.4") > -1 || s.IndexOf("1.2.5") > -1)
{
file.Close();
typeofDicomFile = TypeOfDicomFile.DicomUnknownTransferSyntax;
return(false);
}
if (s.IndexOf("1.2.840.10008.1.2.2") >= 0)
{
bigEndianTransferSyntax = true;
}
break;
case (int)MODALITY:
modality = GetString(elementLength);
AddInfo(tag, modality);
break;
case (int)(NUMBER_OF_FRAMES):
s = GetString(elementLength);
AddInfo(tag, s);
double frames = Convert.ToDouble(s, new CultureInfo("en-US"));
if (frames > 1.0)
{
nImages = (int)frames;
}
break;
case (int)(SAMPLES_PER_PIXEL):
samplesPerPixel = GetShort();
AddInfo(tag, samplesPerPixel);
break;
case (int)(PHOTOMETRIC_INTERPRETATION):
photoInterpretation = GetString(elementLength);
photoInterpretation = photoInterpretation.Trim();
AddInfo(tag, photoInterpretation);
break;
case (int)(PLANAR_CONFIGURATION):
planarConfiguration = GetShort();
AddInfo(tag, planarConfiguration);
break;
case (int)(ROWS):
height = GetShort();
AddInfo(tag, height);
heightTagFound = true;
break;
case (int)(COLUMNS):
width = GetShort();
AddInfo(tag, width);
widthTagFound = true;
break;
case (int)(PIXEL_SPACING):
String scale = GetString(elementLength);
GetSpatialScale(scale);
AddInfo(tag, scale);
break;
case (int)(SLICE_THICKNESS):
case (int)(SLICE_SPACING):
String spacing = GetString(elementLength);
pixelDepth = Convert.ToDouble(spacing, new CultureInfo("en-US"));
AddInfo(tag, spacing);
break;
case (int)(BITS_ALLOCATED):
bitsAllocated = GetShort();
AddInfo(tag, bitsAllocated);
break;
case (int)(PIXEL_REPRESENTATION):
pixelRepresentation = GetShort();
AddInfo(tag, pixelRepresentation);
break;
case (int)(WINDOW_CENTER):
String center = GetString(elementLength);
int index = center.IndexOf('\\');
if (index != -1)
{
center = center.Substring(index + 1);
}
windowCentre = Convert.ToDouble(center, new CultureInfo("en-US"));
AddInfo(tag, center);
break;
case (int)(WINDOW_WIDTH):
String widthS = GetString(elementLength);
index = widthS.IndexOf('\\');
if (index != -1)
{
widthS = widthS.Substring(index + 1);
}
windowWidth = Convert.ToDouble(widthS, new CultureInfo("en-US"));
AddInfo(tag, widthS);
break;
case (int)(RESCALE_INTERCEPT):
String intercept = GetString(elementLength);
rescaleIntercept = Convert.ToDouble(intercept, new CultureInfo("en-US"));
AddInfo(tag, intercept);
break;
case (int)(RESCALE_SLOPE):
String slop = GetString(elementLength);
rescaleSlope = Convert.ToDouble(slop, new CultureInfo("en-US"));
AddInfo(tag, slop);
break;
case (int)(RED_PALETTE):
reds = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(GREEN_PALETTE):
greens = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(BLUE_PALETTE):
blues = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(PIXEL_DATA):
if (elementLength != 0)
{
offset = location;
AddInfo(tag, location);
decodingTags = false;
}
else
{
AddInfo(tag, null);
}
pixelDataTagFound = true;
break;
default:
AddInfo(tag, null);
break;
}
}
return(true);
}
/// <summary>
/// 更换显示图片
/// </summary>
/// <param name="filefullnamimage"></param>
/// <returns></returns>
public Bitmap fB_ChangeImage(string filefullnamimage)
{
dd.DicomFileName = filefullnamimage;
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
if (typeOfDicomFile == TypeOfDicomFile.Dicom3File ||
typeOfDicomFile == TypeOfDicomFile.DicomOldTypeFile)
{
imageWidth = dd.width;
imageHeight = dd.height;
bitDepth = dd.bitsAllocated;
if (winCD == DBLNULL)
{
winCD = dd.windowCentre;
}
if (winWD == DBLNULL)
{
winWD = dd.windowWidth;
}
//if (winCentreD == DBLNULL) winCentreD = dd.windowCentre;
//if (winWidthD == DBLNULL) winWidthD = dd.windowWidth;
winCentreD = winCD;
winWidthD = winWD;
samplesPerPixel = dd.samplesPerPixel;
signedImage = dd.signedImage;
this.NewImage = true;
if (samplesPerPixel == 1 && bitDepth == 8)
{
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
dd.GetPixels8(ref pixels8);
minPixelValue = pixels8.Min();
maxPixelValue = pixels8.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentreD -= char.MinValue;
}
if (Math.Abs(winWidthD) < 0.001)
{
winWidthD = maxPixelValue - minPixelValue;
}
if ((winCentreD == 0) ||
(minPixelValue > winCentreD) || (maxPixelValue < winCentreD))
{
winCentreD = (maxPixelValue + minPixelValue) / 2;
}
SetParameters(ref pixels8, imageWidth, imageHeight,
winWidthD, winCentreD, samplesPerPixel, true);
}
if (samplesPerPixel == 1 && bitDepth == 16)
{
pixels16.Clear();
pixels8.Clear();
pixels24.Clear();
dd.GetPixels16(ref pixels16);
minPixelValue = pixels16.Min();
maxPixelValue = pixels16.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentreD -= short.MinValue;
}
if (Math.Abs(winWidthD) < 0.001)
{
winWidthD = maxPixelValue - minPixelValue;
}
if ((winCentreD == 0) ||
(minPixelValue > winCentreD) || (maxPixelValue < winCentreD))
{
winCentreD = (maxPixelValue + minPixelValue) / 2;
}
Signed16Image = dd.signedImage;
SetParameters(ref pixels16, imageWidth, imageHeight,
winWidthD, winCentreD, true);
}
if (samplesPerPixel == 3 && bitDepth == 8)
{
// This is an RGB colour image
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
dd.GetPixels24(ref pixels24);
SetParameters(ref pixels24, imageWidth, imageHeight,
winWidthD, winCentreD, samplesPerPixel, true);
}
}
else
{
if (typeOfDicomFile == TypeOfDicomFile.DicomUnknownTransferSyntax)
{
//MessageBox.Show("Sorry, I can't read a DICOM file with this Transfer Syntax.",
// "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
//MessageBox.Show("Sorry, I can't open this file. " +
// "This file does not appear to contain a DICOM image.",
// "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
//Text = "DICOM Image Viewer: ";
// Show a plain grayscale image instead
try
{
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
samplesPerPixel = 1;
imageWidth = this.Width - 25; // 25 is a magic number
imageHeight = this.Height - 25; // Same magic number
int iNoPix = imageWidth * imageHeight;
for (int i = 0; i < iNoPix; ++i)
{
pixels8.Add(240);// 240 is the grayvalue corresponding to the Control colour
}
winWidthD = 256;
winCentreD = 127;
this.SetParameters(ref pixels8, imageWidth, imageHeight,
winWidthD, winCentreD, samplesPerPixel, true);
}
catch (Exception)
{ }
//this.Invalidate();
}
//fv_BitMapCopy(ref btmtmp, bmp); //复制图片
//fv_ImageWriter(ref btmtmp,ddlist.Count-1); //添加文字
fv_ImageWriter(ref bmp);
ComputeScrollBarParameters();//显示位置
return(bmp);
}
private void readDicom(string fileName, string fileNameOnly)
{
dd.DicomFileName = fileName;
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
if (typeOfDicomFile == TypeOfDicomFile.Dicom3File ||
typeOfDicomFile == TypeOfDicomFile.DicomOldTypeFile)
{
imageWidth = dd.width;
imageHeight = dd.height;
bitDepth = dd.bitsAllocated;
winCentre = dd.windowCentre;
winWidth = dd.windowWidth;
samplesPerPixel = dd.samplesPerPixel;
signedImage = dd.signedImage;
label1.Visible = true;
label2.Visible = true;
label3.Visible = true;
label4.Visible = true;
bnSave.Enabled = true;
bnTags.Enabled = true;
bnResetWL.Enabled = true;
label2.Text = imageWidth.ToString() + " X " + imageHeight.ToString();
if (samplesPerPixel == 1)
{
label4.Text = bitDepth.ToString() + " bit";
}
else
{
label4.Text = bitDepth.ToString() + " bit, " + samplesPerPixel +
" samples per pixel";
}
imagePanelControl.NewImage = true;
Text = "DICOM Image Viewer: " + fileNameOnly;
pixels16.Clear();
pixels8.Clear();
pixels24.Clear();
dd.GetPixels16(ref pixels16);
// This is primarily for debugging purposes,
// to view the pixel values as ascii data.
//if (true)
//{
// System.IO.StreamWriter file = new System.IO.StreamWriter(
// "C:\\imageSigned.txt");
// for (int ik = 0; ik < pixels16.Count; ++ik)
// file.Write(pixels16[ik] + " ");
// file.Close();
//}
minPixelValue = pixels16.Min();
maxPixelValue = pixels16.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentre -= short.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
imagePanelControl.Signed16Image = dd.signedImage;
imagePanelControl.SetParameters(ref pixels16, imageWidth, imageHeight,
winWidth, winCentre, true, this);
}
}
public int SaveImage(string Path, string path)
{
DirectoryInfo d = new DirectoryInfo(Path);
FileInfo[] files = d.GetFiles();
int i = 1;
foreach (FileInfo f in files)
{
string PathSave = HttpContext.Current.Server.MapPath("~/DicomImage/" + path);
if (!Directory.Exists(PathSave))
{
Directory.CreateDirectory(PathSave);
}
Class.File file = new Class.File();
file.NameFile = f.Name;
file.TypeFile = f.Extension;
DicomDecoder dd = new DicomDecoder();
dd.DicomFileName = f.FullName;
double winCentre = dd.windowCentre;
double winWidth = dd.windowWidth;
int samplesPerPixel = dd.samplesPerPixel;
bool signedImage = dd.signedImage;
int minPixelValue = 1;
int maxPixelValue = 0;
PathSave += i + ".png";
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
int imageWidth = dd.width;
int imageHeight = dd.height;
bmp = new Bitmap(imageWidth, imageHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
dd.GetPixels8(ref pixels8);
dd.GetPixels16(ref pixels16);
dd.GetPixels24(ref pixels24);
if (pixels8 != null)
{
minPixelValue = pixels8.Min();
maxPixelValue = pixels8.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentre -= char.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
ResetValues(winWidth, winCentre);
pix8 = pixels8;
ComputeLookUpTable8();
CreateImage8(imageWidth, imageHeight);
}
else if (pixels16 != null)
{
minPixelValue = pixels16.Min();
maxPixelValue = pixels16.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentre -= short.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
ResetValues(winWidth, winCentre);
pix16 = pixels16;
ComputeLookUpTable16();
CreateImage16(imageWidth, imageHeight);
}
else if (pixels24 != null)
{
minPixelValue = pixels8.Min();
maxPixelValue = pixels8.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentre -= char.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
ResetValues(winWidth, winCentre);
pix24 = pixels24;
ComputeLookUpTable8();
CreateImage24(imageWidth, imageHeight);
}
i++;
if (bmp != null)
{
bmp.Save(PathSave, ImageFormat.Png);
}
}
return(i);
}
void InitializeDicom()
{
bitsAllocated = 0;
width = 1;
height = 1;
offset = 1;
nImages = 1;
samplesPerPixel = 1;
photoInterpretation = "";
unit = "mm";
windowCentre = 0;
windowWidth = 0;
signedImage = false;
widthTagFound = false;
heightTagFound = false;
pixelDataTagFound = false;
rescaleIntercept = 0.0; // Default value
rescaleSlope = 1.0; // Default value
typeofDicomFile = TypeOfDicomFile.NotDicom;
}
private void ReadAndDisplayDicomFile(string fileName, string fileNameOnly)
{
dd.DicomFileName = fileName;
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
if (typeOfDicomFile == TypeOfDicomFile.Dicom3File ||
typeOfDicomFile == TypeOfDicomFile.DicomOldTypeFile)
{
imageWidth = dd.width;
imageHeight = dd.height;
bitDepth = dd.bitsAllocated;
winCentre = dd.windowCentre;
winWidth = dd.windowWidth;
samplesPerPixel = dd.samplesPerPixel;
signedImage = dd.signedImage;
label1.Visible = true;
label2.Visible = true;
label3.Visible = true;
label4.Visible = true;
bnSave.Enabled = true;
bnTags.Enabled = true;
bnResetWL.Enabled = true;
label2.Text = imageWidth.ToString() + " X " + imageHeight.ToString();
if (samplesPerPixel == 1)
{
label4.Text = bitDepth.ToString() + " bit";
}
else
{
label4.Text = bitDepth.ToString() + " bit, " + samplesPerPixel +
" samples per pixel";
}
imagePanelControl.NewImage = true;
Text = "DICOM Image Viewer: " + fileNameOnly;
if (samplesPerPixel == 1 && bitDepth == 8)
{
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
dd.GetPixels8(ref pixels8);
// This is primarily for debugging purposes,
// to view the pixel values as ascii data.
//if (true)
//{
// System.IO.StreamWriter file = new System.IO.StreamWriter(
// "C:\\imageSigned.txt");
// for (int ik = 0; ik < pixels8.Count; ++ik)
// file.Write(pixels8[ik] + " ");
// file.Close();
//}
minPixelValue = pixels8.Min();
maxPixelValue = pixels8.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentre -= char.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
imagePanelControl.SetParameters(ref pixels8, imageWidth, imageHeight,
winWidth, winCentre, samplesPerPixel, true, this);
}
if (samplesPerPixel == 1 && bitDepth == 16)
{
pixels16.Clear();
pixels8.Clear();
pixels24.Clear();
dd.GetPixels16(ref pixels16);
// This is primarily for debugging purposes,
// to view the pixel values as ascii data.
//if (true)
//{
// System.IO.StreamWriter file = new System.IO.StreamWriter(
// "C:\\imageSigned.txt");
// for (int ik = 0; ik < pixels16.Count; ++ik)
// file.Write(pixels16[ik] + " ");
// file.Close();
//}
minPixelValue = pixels16.Min();
maxPixelValue = pixels16.Max();
// Bug fix dated 24 Aug 2013 - for proper window/level of signed images
// Thanks to Matias Montroull from Argentina for pointing this out.
if (dd.signedImage)
{
winCentre -= short.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
imagePanelControl.Signed16Image = dd.signedImage;
imagePanelControl.SetParameters(ref pixels16, imageWidth, imageHeight,
winWidth, winCentre, true, this);
}
if (samplesPerPixel == 3 && bitDepth == 8)
{
// This is an RGB colour image
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
dd.GetPixels24(ref pixels24);
// This code segment is primarily for debugging purposes,
// to view the pixel values as ascii data.
//if (true)
//{
// System.IO.StreamWriter file = new System.IO.StreamWriter(
// "C:\\image24.txt");
// for (int ik = 0; ik < pixels24.Count; ++ik)
// file.Write(pixels24[ik] + " ");
// file.Close();
//}
imagePanelControl.SetParameters(ref pixels24, imageWidth, imageHeight,
winWidth, winCentre, samplesPerPixel, true, this);
}
}
else
{
if (typeOfDicomFile == TypeOfDicomFile.DicomUnknownTransferSyntax)
{
MessageBox.Show("Sorry, I can't read a DICOM file with this Transfer Syntax.",
"Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
MessageBox.Show("Sorry, I can't open this file. " +
"This file does not appear to contain a DICOM image.",
"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
Text = "DICOM Image Viewer: ";
// Show a plain grayscale image instead
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
samplesPerPixel = 1;
imageWidth = imagePanelControl.Width - 25; // 25 is a magic number
imageHeight = imagePanelControl.Height - 25; // Same magic number
int iNoPix = imageWidth * imageHeight;
for (int i = 0; i < iNoPix; ++i)
{
pixels8.Add(240);// 240 is the grayvalue corresponding to the Control colour
}
winWidth = 256;
winCentre = 127;
imagePanelControl.SetParameters(ref pixels8, imageWidth, imageHeight,
winWidth, winCentre, samplesPerPixel, true, this);
imagePanelControl.Invalidate();
label1.Visible = false;
label2.Visible = false;
label3.Visible = false;
label4.Visible = false;
bnSave.Enabled = false;
bnTags.Enabled = false;
bnResetWL.Enabled = false;
}
}
private void ReadAndDisplayDicomFile(string fileName, string fileNameOnly)
{
dd.DicomFileName = fileName;
TypeOfDicomFile typeOfDicomFile = dd.typeofDicomFile;
if (typeOfDicomFile == TypeOfDicomFile.Dicom3File ||
typeOfDicomFile == TypeOfDicomFile.DicomOldTypeFile)
{
imageWidth = dd.width;
imageHeight = dd.height;
bitDepth = dd.bitsAllocated;
winCentre = dd.windowCentre;
winWidth = dd.windowWidth;
samplesPerPixel = dd.samplesPerPixel;
signedImage = dd.signedImage;
bnTags.Enabled = true;
imagePanelControl.NewImage = true;
Text = "DICOM Image Viewer: " + fileNameOnly;
if (samplesPerPixel == 1 && bitDepth == 8)
{
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
dd.GetPixels8(ref pixels8);
minPixelValue = pixels8.Min();
maxPixelValue = pixels8.Max();
if (dd.signedImage)
{
winCentre -= char.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
imagePanelControl.SetParameters(ref pixels8, imageWidth, imageHeight,
winWidth, winCentre, samplesPerPixel, true, this);
}
if (samplesPerPixel == 1 && bitDepth == 16)
{
pixels16.Clear();
pixels8.Clear();
pixels24.Clear();
dd.GetPixels16(ref pixels16);
minPixelValue = pixels16.Min();
maxPixelValue = pixels16.Max();
if (dd.signedImage)
{
winCentre -= short.MinValue;
}
if (Math.Abs(winWidth) < 0.001)
{
winWidth = maxPixelValue - minPixelValue;
}
if ((winCentre == 0) ||
(minPixelValue > winCentre) || (maxPixelValue < winCentre))
{
winCentre = (maxPixelValue + minPixelValue) / 2;
}
imagePanelControl.Signed16Image = dd.signedImage;
imagePanelControl.SetParameters(ref pixels16, imageWidth, imageHeight,
winWidth, winCentre, true, this);
}
if (samplesPerPixel == 3 && bitDepth == 8)
{
// This is an RGB colour image
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
dd.GetPixels24(ref pixels24);
imagePanelControl.SetParameters(ref pixels24, imageWidth, imageHeight,
winWidth, winCentre, samplesPerPixel, true, this);
}
}
else
{
if (typeOfDicomFile == TypeOfDicomFile.DicomUnknownTransferSyntax)
{
MessageBox.Show("Xin lỗi, File DiCOM này không thể mở!",
"Chú Ý !!!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
MessageBox.Show("Xin lỗi, File này không tồn tại ảnh",
"Chú Ý !!!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
Text = "DICOM Image Viewer: ";
// Show a plain grayscale image instead
pixels8.Clear();
pixels16.Clear();
pixels24.Clear();
samplesPerPixel = 1;
imageWidth = imagePanelControl.Width - 25; // 25 is a magic number
imageHeight = imagePanelControl.Height - 25; // Same magic number
int iNoPix = imageWidth * imageHeight;
for (int i = 0; i < iNoPix; ++i)
{
pixels8.Add(240);// 240 is the grayvalue corresponding to the Control colour
}
winWidth = 256;
winCentre = 127;
imagePanelControl.SetParameters(ref pixels8, imageWidth, imageHeight,
winWidth, winCentre, samplesPerPixel, true, this);
imagePanelControl.Invalidate();
//bnSave.Enabled = false;
bnTags.Enabled = false;
}
List <string> lstString = dd.dicomInfo;
SetString(ref lstString);
}
public bool ReadFileInfo()
{
long skipCount = Convert.ToInt32(ID_OFFSET);
bitsAllocated = 16;
file.BaseStream.Seek(skipCount, SeekOrigin.Begin);
location += ID_OFFSET;
if (GetString(4) != DICM)
{
// This is for reading older DICOM files (Before 3.0)
// Seek from the beginning of the file
file.BaseStream.Seek(0, SeekOrigin.Begin);
location = 0;
// Older DICOM files do not have the preamble and prefix
dicmFound = false;
// Continue reading further.
// See whether the width, height and pixel data tags
// are present. If these tags are present, then it we conclude that this is a
// DICOM file, because all DICOM files should have at least these three tags.
// Otherwise, it is not a DICOM file.
}
else
{
// We have a DICOM 3.0 file
dicmFound = true;
}
bool decodingTags = true;
samplesPerPixel = 1;
photoInterpretation = "";
string modality;
while (decodingTags)
{
int tag = GetNextTag();
if ((location & 1) != 0)
{
oddLocations = true;
}
if (inSequence)
{
AddInfo(tag, null);
continue;
}
string s;
switch (tag)
{
case (int)(TRANSFER_SYNTAX_UID):
s = GetString(elementLength);
AddInfo(tag, s);
if (s.IndexOf("1.2.4", StringComparison.Ordinal) > -1 ||
s.IndexOf("1.2.5", StringComparison.Ordinal) > -1)
{
file.Close();
typeofDicomFile = TypeOfDicomFile.DicomUnknownTransferSyntax;
// Return gracefully indicating that this type of
// Transfer Syntax cannot be handled
return(false);
}
if (s.IndexOf("1.2.840.10008.1.2.2", StringComparison.Ordinal) >= 0)
{
bigEndianTransferSyntax = true;
}
break;
case (int)(SERIES_NUMBER):
s = GetString(elementLength);
SeriesNumber = Convert.ToInt32(s);
AddInfo(tag, s);
break;
case (int)(INSTANCE_NUMBER):
s = GetString(elementLength);
InstanceNumber = Convert.ToInt32(s);
;
AddInfo(tag, s);
break;
case (int)MODALITY:
modality = GetString(elementLength);
AddInfo(tag, modality);
break;
case (int)(NUMBER_OF_FRAMES):
s = GetString(elementLength);
AddInfo(tag, s);
double frames = Convert.ToDouble(s, new CultureInfo("en-US"));
if (frames > 1.0)
{
nImages = (int)frames;
}
break;
case (int)(SAMPLES_PER_PIXEL):
samplesPerPixel = GetShort();
AddInfo(tag, samplesPerPixel);
break;
case (int)(PHOTOMETRIC_INTERPRETATION):
photoInterpretation = GetString(elementLength);
photoInterpretation = photoInterpretation.Trim();
AddInfo(tag, photoInterpretation);
break;
case (int)(PLANAR_CONFIGURATION):
int planarConfiguration = GetShort();
AddInfo(tag, planarConfiguration);
break;
case (int)(ROWS):
height = GetShort();
AddInfo(tag, height);
heightTagFound = true;
break;
case (int)(COLUMNS):
width = GetShort();
AddInfo(tag, width);
widthTagFound = true;
break;
case (int)(PIXEL_SPACING):
String scale = GetString(elementLength);
PixelSpacingValue = scale.Split(new char[] { '\\' }, 2);
GetSpatialScale(scale);
AddInfo(tag, scale);
break;
case (int)(SLICE_SPACING):
String space = GetString(elementLength);
pixeSpace = Convert.ToDouble(space, new CultureInfo("en-US"));
AddInfo(tag, space);
break;
case (int)(SLICE_THICKNESS):
String spacing = GetString(elementLength);
pixelDepth = Convert.ToDouble(spacing, new CultureInfo("en-US"));
AddInfo(tag, spacing);
break;
case (int)(BITS_ALLOCATED):
bitsAllocated = GetShort();
AddInfo(tag, bitsAllocated);
break;
case (int)(PIXEL_REPRESENTATION):
pixelRepresentation = GetShort();
AddInfo(tag, pixelRepresentation);
break;
case (int)(WINDOW_CENTER):
String center = GetString(elementLength);
int index = center.IndexOf('\\');
if (index != -1)
{
center = center.Substring(index + 1);
}
windowCentre = Convert.ToDouble(center, new CultureInfo("en-US"));
AddInfo(tag, center);
break;
case (int)(WINDOW_WIDTH):
String widthS = GetString(elementLength);
index = widthS.IndexOf('\\');
if (index != -1)
{
widthS = widthS.Substring(index + 1);
}
windowWidth = Convert.ToDouble(widthS, new CultureInfo("en-US"));
AddInfo(tag, widthS);
break;
case (int)(RESCALE_INTERCEPT):
String intercept = GetString(elementLength);
rescaleIntercept = Convert.ToDouble(intercept, new CultureInfo("en-US"));
AddInfo(tag, intercept);
break;
case (int)(RESCALE_SLOPE):
String slop = GetString(elementLength);
rescaleSlope = Convert.ToDouble(slop, new CultureInfo("en-US"));
AddInfo(tag, slop);
break;
case (int)(RED_PALETTE):
reds = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(GREEN_PALETTE):
greens = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(BLUE_PALETTE):
blues = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(PIXEL_DATA):
if (elementLength != 0)
{
offset = location;
AddInfo(tag, location);
decodingTags = false;
}
else
{
AddInfo(tag, null);
}
pixelDataTagFound = true;
break;
default:
AddInfo(tag, null);
break;
}
}
return(true);
}
public bool ReadFileInfo() /////读取各个DataElement中的VF，并将其保存起来
{
long skipCount = Convert.ToInt32(ID_OFFSET); //数据元素起始地址128
bitsAllocated = 16;
file.BaseStream.Seek(skipCount, SeekOrigin.Begin);//访问skipCount二进制
location += ID_OFFSET;
if (GetString(4) != DICM)//128字节后的四个字节存放“DICM”
//GetString()是自定义方法：从当前位置起，读取指定字节数，并返回为字符串类型
{
//用于读取3.0之前的DICOM文件
// 找文件开始处
file.BaseStream.Seek(0, SeekOrigin.Begin);
location = 0;
// 3.0之前的DICOM文件没有序言和前缀( preamble and prefix）
dicmFound = false;
// 继续读取信息.
//查看宽、高、像素标签是否存在。
//如果这些标记存在，那么我们就会得出结论，这是一个DICOM文件，
//因为所有的DICOM文件都应该至少有这三个标记。
//否则，它不是DICOM文件。
}
else
{
// true表示文件是3.0的版本
dicmFound = true;
}
/////接下来读取DICOM文件信息
bool decodingTags = true;
samplesPerPixel = 1;///通道数为1
int planarConfiguration = 0;
photoInterpretation = "";
string modality;
while (decodingTags)
{
int tag = GetNextTag();///读取下一个Tag
if ((location & 1) != 0)
{
oddLocations = true;
}
if (inSequence)/////未定义标签？？？？？？
{
AddInfo(tag, null);
continue;
}
string s;
switch (tag)
{
case (int)(TRANSFER_SYNTAX_UID): ///00020010决定普通Tag的读取方式Little-Endlian还是Big-Endlian,以及VR的显式隐式
s = GetString(elementLength); //读取elementLength长度的数据
AddInfo(tag, s);
////Tag为00020010时可以通过VF值判断Little/Big，VR显式/隐式
if (s.IndexOf("1.2.4") > -1 || s.IndexOf("1.2.5") > -1) ///字符串匹配返回第一次出现的位置
{
file.Close();
typeofDicomFile = TypeOfDicomFile.DicomUnknownTransferSyntax;
// 表示无法处理
return(false);
}
if (s.IndexOf("1.2.840.10008.1.2.2") >= 0)
{
bigEndianTransferSyntax = true;
}
break;
case (int)MODALITY: ///检查模态(MRI/CT/CR/DR)
modality = GetString(elementLength);
AddInfo(tag, modality);
break;
case (int)(NUMBER_OF_FRAMES):
s = GetString(elementLength);
AddInfo(tag, s);
double frames = Convert.ToDouble(s, new CultureInfo("en-US"));
if (frames > 1.0)
{
nImages = (int)frames;
}
break;
case (int)(SAMPLES_PER_PIXEL): ///图像上的采样率.
samplesPerPixel = GetShort(); ////采样率
AddInfo(tag, samplesPerPixel);
break;
case (int)(PHOTOMETRIC_INTERPRETATION): ///光度计的解释,对于CT图像，用两个枚举值MONOCHROME1，MONOCHROME
//2.用来判断图像是否是彩色的，MONOCHROME1/2是灰度图， RGB则是真彩色图，还有其他.
photoInterpretation = GetString(elementLength);
photoInterpretation = photoInterpretation.Trim();
AddInfo(tag, photoInterpretation);
break;
case (int)(PLANAR_CONFIGURATION):
planarConfiguration = GetShort();
AddInfo(tag, planarConfiguration);
break;
case (int)(ROWS): //图像的总行数，行分辨率.
height = GetShort();
AddInfo(tag, height);
heightTagFound = true;
break;
case (int)(COLUMNS): //图像的总列数，列分辨率.
width = GetShort();
AddInfo(tag, width);
widthTagFound = true;
break;
case (int)(PIXEL_SPACING): //像素间距.像素中心之间的物理间距.
String scale = GetString(elementLength);
GetSpatialScale(scale); ///赋值像素行距，列距
AddInfo(tag, scale);
break;
case (int)(SLICE_THICKNESS): //层厚
case (int)(SLICE_SPACING): //层与层之间的间距,单位为mm
String spacing = GetString(elementLength);
pixelDepth = Convert.ToDouble(spacing, new CultureInfo("en-US"));
AddInfo(tag, spacing);
break;
case (int)(BITS_ALLOCATED): //分配的位数:存储每一个像素值时分配的位数，每一个样本应该拥有相同的这个值.
bitsAllocated = GetShort();
AddInfo(tag, bitsAllocated);
break;
case (int)(PIXEL_REPRESENTATION): //像素数据的表现类型:这是一个枚举值，分别为十六进制数0000和0001.0000H = 无符号整数，0001H = 2的补码.
pixelRepresentation = GetShort();
AddInfo(tag, pixelRepresentation);
break;
case (int)(WINDOW_CENTER): //窗位*******
String center = GetString(elementLength);
int index = center.IndexOf('\\');
if (index != -1)
{
center = center.Substring(index + 1);
}
windowCentre = Convert.ToDouble(center, new CultureInfo("en-US")); ///**********
AddInfo(tag, center);
break;
case (int)(WINDOW_WIDTH): //窗宽*******
String widthS = GetString(elementLength);
index = widthS.IndexOf('\\');
if (index != -1)
{
widthS = widthS.Substring(index + 1);
}
windowWidth = Convert.ToDouble(widthS, new CultureInfo("en-US")); ////**********
AddInfo(tag, widthS);
break;
case (int)(RESCALE_INTERCEPT): ///截距:如果表明不同模态的LUT颜色对应表不存在时,则使用方程Units = m*SV + b,计算真实的像素值到呈现像素值。其中这个值为表达式中的b。
String intercept = GetString(elementLength);
rescaleIntercept = Convert.ToDouble(intercept, new CultureInfo("en-US"));
AddInfo(tag, intercept);
break;
case (int)(RESCALE_SLOPE): ///斜率.这个值为表达式中的m
String slop = GetString(elementLength);
rescaleSlope = Convert.ToDouble(slop, new CultureInfo("en-US"));
AddInfo(tag, slop);
break;
case (int)(RED_PALETTE):
reds = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(GREEN_PALETTE):
greens = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(BLUE_PALETTE):
blues = GetLut(elementLength);
AddInfo(tag, elementLength / 2);
break;
case (int)(PIXEL_DATA):
// 图像数据开始处
if (elementLength != 0)
{
offset = location;
AddInfo(tag, location);
decodingTags = false;
}
else
{
AddInfo(tag, null);
}
pixelDataTagFound = true;
break;
default:
AddInfo(tag, null); /////不用的Tag暂时赋值为空
break;
}
}
return(true);
}