Develop Reference

How to replace the Pixel Data of DICOM file using fo-DICOM?

I want to replace the pixel data of a DICOM file with another one. I used this code:
public bool ImportImage(string imageFile, string newFilePah, string oldDicomFile)
{
try
{
Bitmap bitmap = new Bitmap(imageFile);
bitmap = GetValidImage(bitmap);
int rows, columns;
byte[] pixels = GetPixels(bitmap, out rows, out columns);
MemoryByteBuffer buffer = new MemoryByteBuffer(pixels);
DicomDataset dataset = new DicomDataset();
var df = DicomFile.Open(oldDicomFile);
FillDataset(ref dataset, df);
DicomTransferSyntax dicomTransfer = df.Dataset.Get<DicomTransferSyntax>(DicomTag.TransferSyntaxUID, DicomTransferSyntax.JPEGProcess14);
dataset.AddOrUpdate(DicomTag.PhotometricInterpretation, PhotometricInterpretation.Rgb.Value);
dataset.AddOrUpdate(DicomTag.Rows, (ushort)rows);
dataset.AddOrUpdate(DicomTag.Columns, (ushort)columns);
dataset.AddOrUpdate(DicomTag.BitsAllocated, (ushort)8);
DicomPixelData pixelData = DicomPixelData.Create(dataset, true);
pixelData.BitsStored = 8;
pixelData.SamplesPerPixel = 3;
pixelData.HighBit = 7;
pixelData.PixelRepresentation = 0;
pixelData.PlanarConfiguration = 0;
pixelData.AddFrame(buffer);
DicomFile dicomfile = new DicomFile(dataset.Clone(dicomTransfer));
dicomfile.Save(newFilePah);
return true;
}
catch(Exception ddd) { return false; }
}
private void FillDataset(ref DicomDataset dataset, DicomFile df)
{
foreach(var item in df.Dataset)
{
if(!item.Tag.Group.ToString().Equals("7FE0") && !item.Tag.Group.ToString().Equals("40"))
dataset.Add(item);
}
}
The output DICOM file loses many tags which affect image display.
I referred to this answer. But the AddOrUpdatePixelData method used in that answer is deprecated in version v4.0.0-rc1 that I am using. So that answer does not help me.
Is there any other way to change the pixel data of a DICOM file using fo-DICOM?

Following code does replace the pixel data correctly.
public static bool ImportImage(string imageFile, string newFilePah, string oldDicomFile)
{
Bitmap bitmap = new Bitmap(imageFile);
int rows, columns;
byte[] pixels = GetPixels(bitmap, out rows, out columns);
MemoryByteBuffer buffer = new MemoryByteBuffer(pixels);
DicomDataset dataset = new DicomDataset();
var dicomfile = DicomFile.Open(oldDicomFile);
dataset = dicomfile.Dataset.Clone();
dataset.AddOrUpdate(DicomTag.PhotometricInterpretation, PhotometricInterpretation.Rgb.Value);
dataset.AddOrUpdate(DicomTag.Rows, (ushort)rows);
dataset.AddOrUpdate(DicomTag.Columns, (ushort)columns);
dataset.AddOrUpdate(DicomTag.BitsAllocated, (ushort)8);
DicomPixelData pixelData = DicomPixelData.Create(dataset, true);
pixelData.BitsStored = 8;
pixelData.SamplesPerPixel = 3;
pixelData.HighBit = 7;
pixelData.PhotometricInterpretation = PhotometricInterpretation.Rgb;
pixelData.PixelRepresentation = 0;
pixelData.PlanarConfiguration = 0;
pixelData.Height = (ushort)rows;
pixelData.Width = (ushort)columns;
pixelData.AddFrame(buffer);
dicomfile = new DicomFile(dataset);
dicomfile.Save(newFilePah);
return true;
}
private static byte[] GetPixels(Bitmap bitmap, out int rows, out int columns)
{
using(var stream = new MemoryStream())
{
bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
rows = bitmap.Height;
columns = bitmap.Width;
return stream.ToArray();
}
}
You can see I have cleaned up your code much.
But the major change is using System.Drawing.Imaging.ImageFormat.Bmp instead of other formats. This depends on actual input image format. Use the format as that of input image.
For detailed insight, please refer to this source code on github.

Matching two imageBox controls (EmguCV)

Currently I'm working with a fingerletter recognition using visual studio 2013 C# along with emguCV. i already have a database using ms access and a program which allow me to add images(in graysacle already) to it.
I've got 2 imageBox (imageBox0, imageBox1, imageBox2).., imageBox0 displays the live streaming of my camera., imageBox1 displays the processed image of imageBox0 (contour of my hand, grayscale, rectangle) and imageBox2 displays a selected image from the ms access database.
What I needed is a way to recognize an image from imageBox1 that is similar to imageBox2 or (in the whole images inside the database)
Here are snapshots of what I am doing:
I am using EmguCV version 2.
private Image GetImgFromDB()
{
if (rowNumber >= 0)
{
byte[] FetchedImgBytes = (byte[])LocalDataTable.Rows[rowNumber]["alphaImage"];
MemoryStream stream = new MemoryStream(FetchedImgBytes);
FetchedImg = Image.FromStream(stream);
txtAlphaName.Text = (string)LocalDataTable.Rows[rowNumber]["AlphaName"];
Bitmap FetchedImgCV = (Bitmap)FetchedImg;
normalizedMasterImage = new Image<Gray, Byte>(FetchedImgCV);
return FetchedImg;
}
else
{
MessageBox.Show("There are no images in the dataase yet. add some Please");
//return null;
}
return null;
} `

I've been though this with quiet a good degree of success. Mine compares two images and you set the percentage differences between to two to raise an alert.
The key is to compare hashes, not raw data...
class bitmapCompare
{
public enum CompareResult
{
ciCompareOk,
ciPixelMismatch,
ciSizeMismatch
};
public static CompareResult Compare(bool useHash, Bitmap bmp1, Bitmap bmp2, out double err, out Bitmap diff)
{
CompareResult cr = CompareResult.ciCompareOk;
int er = 0;
err = 0;
diff = new Bitmap(bmp1.Width, bmp1.Height);
//Test to see if we have the same size of image
if (bmp1.Size != bmp2.Size)
{
cr = CompareResult.ciSizeMismatch;
err = 100;
}
else
{
//Convert each image to a byte array
System.Drawing.ImageConverter ic =
new System.Drawing.ImageConverter();
byte[] btImage1 = new byte[1];
btImage1 = (byte[])ic.ConvertTo(bmp1, btImage1.GetType());
byte[] btImage2 = new byte[1];
btImage2 = (byte[])ic.ConvertTo(bmp2, btImage2.GetType());
//Compute a hash for each image
SHA256Managed shaM = new SHA256Managed();
byte[] hash1 = shaM.ComputeHash(btImage1);
byte[] hash2 = shaM.ComputeHash(btImage2);
//Compare the hash values
if (useHash)
{
for (int i = 0; i < hash1.Length && i < hash2.Length; i++)
{
if (hash1[i] != hash2[i])
{
er++;
cr = CompareResult.ciPixelMismatch;
}
}
}
else
{
int totalPixels = 0;
er = 0;
for (int x = 0; x < bmp1.Width; x++)
{
for (int y = 0; y < bmp1.Height; y++)
{
totalPixels++;
if (bmp1.GetPixel(x, y) != bmp2.GetPixel(x, y))
{
diff.SetPixel(x, y, Color.Black);
er++;
cr = CompareResult.ciPixelMismatch;
}
else
diff.SetPixel(x, y, Color.White);
}
}
System.Diagnostics.Debug.WriteLine("Total pixels:{0}", totalPixels);
System.Diagnostics.Debug.WriteLine("Diff pixels:{0}", er);
if (er > 0)
err = (double)er / ((double)bmp1.Height * (double)bmp1.Width);
else
err = 0;
if (err > 0) err = Math.Round(err*100, 1);
if (err > 100) err = 100;
}
}
return cr;
}
Feel free to change, this was only a POC, nothing production.

Saving raw detph-data

I am trying to save my kinect raw depth-data and i dont want to use the Kinect Studio, because i need the raw-data for further calculations. I am using the kinectv2 and kinect sdk!
My problem is that i just get low FPS for the saved data. Its about 15-17FPS.
Here my Framereader ( in further steps i want to save colorstream also):
frameReader = kinectSensor.OpenMultiSourceFrameReader(FrameSourceTypes.Depth);
frameReader.MultiSourceFrameArrived += Reader_MultiSourceFrameArrived;
Here the Event:
void Reader_MultiSourceFrameArrived(object sender, MultiSourceFrameArrivedEventArgs e)
{
var reference = e.FrameReference.AcquireFrame();
saveFrameTest(reference);
frame_num++;
}
Here the saving-function:
private unsafe void saveFrameTest(Object reference)
{
MultiSourceFrame mSF = (MultiSourceFrame)reference;
using (var frame = mSF.DepthFrameReference.AcquireFrame())
{
if (frame != null)
{
using (Microsoft.Kinect.KinectBuffer depthBuffer = frame.LockImageBuffer())
{
if ((frame.FrameDescription.Width * frame.FrameDescription.Height) == (depthBuffer.Size / frame.FrameDescription.BytesPerPixel))
{
ushort* frameData = (ushort*)depthBuffer.UnderlyingBuffer;
byte[] rawDataConverted = new byte[(int)(depthBuffer.Size / 2)];
for (int i = 0; i < (int)(depthBuffer.Size / 2); ++i)
{
ushort depth = frameData[i];
rawDataConverted[i] = (byte)(depth >= frame.DepthMinReliableDistance && depth <= frame.DepthMaxReliableDistance ? (depth) : 0);
}
String date = string.Format("{0:hh-mm-ss}", DateTime.Now);
String filePath = System.IO.Directory.GetCurrentDirectory() + "/test/" +date+".raw";
File.WriteAllBytes(filePath, rawDataConverted);
rawDataConverted = null;
}
}
}
}
}
Further Infomration:
I included my code in a simple Console-Application on a Intel® Xeon® Processor E5-1620 3,7GHz with 16 GB RAM.
i think the for-loop is taking to much time:
for (int i = 0; i < (int)(depthBuffer.Size / 2); ++i)
{
ushort depth = frameData[i];
rawDataConverted[i] = (byte)(depth >= frame.DepthMinReliableDistance && depth <= frame.DepthMaxReliableDistance ? (depth) : 0);
}
I could improved my framerate. Now, i am accessing the kinectbuffer directly and resign the for-loop.
Microsoft.Kinect.KinectBuffer depthBuffer = frame.LockImageBuffer();
Marshal.Copy(depthBuffer.UnderlyingBuffer, rawData_depth, 0, (depthImageSize));
depthBuffer.Dispose();
frame.Dispose();
However i couldnt get the 30FPS-rate. Now it is about 25 FPS.

You could try something like this to get your array.
It's what I normally use.
var frame = frameReference.AcquireFrame();
var frameDescription = frame.FrameDescription;
ushort[] frameData = new ushort[frameDescription.Width * frameDescription.Height];
frame.CopyFrameDataToArray(frameData);

C# task async await smart card - UI thread blocked

I'm new to C#, and I'm trying to use task async await for a WinsForm GUI. I've read so many tutorials about it, but all of them implement tasks differently. Some tasks use functions, and others just put the code in to execute. Some use Task.Run() or just await. Furthermore, all the examples I've seen are of functions that are included in the UI class. I'm trying to run functions that are in classes that are within my UI. I'm just really confused now, and don't know what's right/wrong.
What I'm trying to do is write a file to an EEPROM, using the SpringCard API/ PC/SC library. I parse the file into packets and write it to the smart card. I also want to update a status label and progress bar. A lot of things can go wrong. I have flags set in the smart card, and right now I just a while loop running until it reads a certain flag, which will obviously stall the program if it's forever waiting for a flag.
I guess I'm just confused about how to set it up. Help. I've tried using Tasks. Here is my code so far.
/* Initialize open file dialog */
OpenFileDialog ofd = new OpenFileDialog();
ofd.Multiselect = false;
ofd.Filter = "BIN Files (.bin)|*.bin|HEX Files (.hex)|*.hex";
ofd.InitialDirectory = "C:";
ofd.Title = "Select File";
//Check open file dialog result
if (ofd.ShowDialog() != DialogResult.OK)
{
if (shade != null)
{
shade.Dispose();
shade = null;
}
return;
}
//progform.Show();
Progress<string> progress = new Progress<string>();
file = new ATAC_File(ofd.FileName);
try
{
cardchannel.DisconnectReset();
Task upgrade = upgradeASYNC();
if(cardchannel.Connect())
{
await upgrade;
}
else
{
add_log_text("Connection to the card failed");
MessageBox.Show("Failed to connect to the card in the reader : please check that you don't have another application running in background that tries to work with the smartcards in the same time");
if (shade != null)
{
shade.Dispose();
shade = null;
}
cardchannel = null;
}
}
private async Task upgradeASYNC()
{
int i = 0;
int totalpackets = 0;
add_log_text("Parsing file into packets.");
totalpackets = file.parseFile();
/*progress.Report(new MyTaskProgressReport
{
CurrentProgressAmount = i,
TotalProgressAmount = totalpackets,
CurrentProgressMessage = "Sending upgrade file..."
});*/
ST_EEPROMM24LR64ER chip = new ST_EEPROMM24LR64ER(this, cardchannel, file, EEPROM.DONOTHING);
bool writefile = chip.WriteFileASYNC();
if(writefile)
{
add_log_text("WRITE FILE OK.");
}
else
{
add_log_text("WRITE FILE BAD.");
}
}
In the file class:
public int parseFile()
{
FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
FileInfo finfo = new FileInfo(filename);
int readbytecount = 0;
int packetcount = 0;
int numofbytesleft = 0;
byte[] hash = new byte[4];
byte[] packetinfo = new byte[4];
byte[] filechunk = null;
/* Read file until all file bytes read */
while (size_int > readbytecount)
{
//Initialize packet array
filechunk = new byte[MAXDATASIZE];
//read into byte array of max write size
if (packetcount < numoffullpackets)
{
//Initialize packet info array
packetinfo[0] = (byte)((size_int + 1) % 0x0100); //packetcountlo
packetinfo[1] = (byte)((size_int + 1) / 0x0100); //packetcounthi
packetinfo[2] = (byte)((packetcount + 1) / 0x0100); //packetcounthi
packetinfo[3] = (byte)((packetcount + 1) % 0x0100); //packetcountlo
//read bytes from file into packet array
bytesread = br.Read(filechunk, 0, MAXDATASIZE);
//add number of bytes read to readbytecount
readbytecount += bytesread;
}
//read EOF into byte array of size smaller than max write size
else if (packetcount == numoffullpackets)
{
//find out how many bytes left to read
numofbytesleft = size_int - (MAXDATASIZE * numoffullpackets);
//Initialize packet info array
packetinfo[0] = (byte)((size_int + 1) / 0x0100); //packetcounthi
packetinfo[1] = (byte)((size_int + 1) % 0x0100); //packetcountlo
packetinfo[2] = (byte)((packetcount + 1) / 0x0100); //packetcounthi
packetinfo[3] = (byte)((packetcount + 1) % 0x0100); //packetcountlo
//Initialize array and add byte padding, MAXWRITESIZE-4 because the other 4 bytes will be added when we append the CRC
//filechunk = new byte[numofbytesleft];
for (int j = 0; j < numofbytesleft; j++)
{
//read byte from file
filechunk[j] = br.ReadByte();
//add number of bytes read to readbytecount
readbytecount++;
}
for (int j = numofbytesleft; j < MAXDATASIZE; j++)
{
filechunk[j] = 0xFF;
}
}
else
{
MessageBox.Show("ERROR");
}
//calculate crc32 on byte array
int i = 0;
foreach (byte b in crc32.ComputeHash(filechunk))
{
hash[i++] = b;
}
//Append hash to filechunk to create new byte array named chunk
byte[] chunk = new byte[MAXWRITESIZE];
Buffer.BlockCopy(packetinfo, 0, chunk, 0, packetinfo.Length);
Buffer.BlockCopy(filechunk, 0, chunk, packetinfo.Length, filechunk.Length);
Buffer.BlockCopy(hash, 0, chunk, (packetinfo.Length + filechunk.Length), hash.Length);
//Add chunk to byte array list
packetcount++;
PacketBYTE.Add(chunk);
}
parseCMD();
return PacketBYTE.Count;
}
In the EEPROM class:
public bool WriteFileASYNC()
{
int blocknum = ATAC_CONSTANTS.RFBN_RFstartwrite;
byte[] response = null;
CAPDU[] EEPROMcmd = null;
int packetCount = 0;
log("ATTEMPT: Read response funct flag.");
do
{
StopRF();
Thread.SpinWait(100);
StartRF();
log("ATTEMPT: Write function flag.");
while (!WriteFlag(ATAC_CONSTANTS.RFBN_functflag, EEPROM.UPLOADAPP)) ;
} while (ReadFunctFlag(ATAC_CONSTANTS.RFBN_responseflag, 0) != EEPROM.UPLOADAPP);
for (int EEPROMcount = 0; EEPROMcount < file.CmdBYTE.Count; EEPROMcount++)
{
string temp = "ATTEMPT: Write EEPROM #" + EEPROMcount.ToString();
log(temp);
EEPROMcmd = file.CmdBYTE[EEPROMcount];
while (EEPROMcmd[blocknum] != null)
{
if (blocknum % 32 == 0)
{
string tempp = "ATTEMPT: Write packet #" + packetCount.ToString();
log("ATTEMPT: Write packet #");
packetCount++;
}
do
{
response = WriteBinaryASYNC(EEPROMcmd[blocknum]);
} while (response == null);
blocknum++;
}
log("ATTEMPT: Write packet flag.");
while (!WriteFlag(ATAC_CONSTANTS.RFBN_packetflag, ATAC_CONSTANTS.RFflag)) ;
log("ATTEMPT: Write packet flag.");
do
{
StopRF();
Thread.SpinWait(300);
StartRF();
} while (!ReadFlag(ATAC_CONSTANTS.RFBN_packetresponseflag, ((blocknum/32) - 1)*(EEPROMcount+1)));
blocknum = ATAC_CONSTANTS.RFBN_RFstartwrite;
}
return true;
}

Tasks are threads.
When you write this:
Task upgrade = upgradeASYNC();
you are simply executing upgradeASYNC in a new thread.
When you write this:
await upgrade;
You are only waiting for the new thread to finish (before going to the next instruction).
And this method
private async Task upgradeASYNC()
returns a Task object only because you add the async keyword. But in the body of this method there is no await. So it just runs synchronously, like any thread job.
I don't have time to rewrite your code, i let that to another stackoverflow user. You should learn and work harder ;)

Convert Pdf file pages to Images with itextsharp

I want to convert Pdf pages in Images using ItextSharp lib.
Have any idea how to convert each page in image file

iText/iTextSharp can generate and/or modify existing PDFs but they do not perform any rendering which is what you are looking for. I would recommend checking out Ghostscript or some other library that knows how to actually render a PDF.

you can use ImageMagick convert pdf to image
convert -density 300 "d:\1.pdf" -scale #1500000 "d:\a.jpg"
and split pdf can use itextsharp
here is the code from others.
void SplitePDF(string filepath)
{
iTextSharp.text.pdf.PdfReader reader = null;
int currentPage = 1;
int pageCount = 0;
//string filepath_New = filepath + "\\PDFDestination\\";
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
//byte[] arrayofPassword = encoding.GetBytes(ExistingFilePassword);
reader = new iTextSharp.text.pdf.PdfReader(filepath);
reader.RemoveUnusedObjects();
pageCount = reader.NumberOfPages;
string ext = System.IO.Path.GetExtension(filepath);
for (int i = 1; i <= pageCount; i++)
{
iTextSharp.text.pdf.PdfReader reader1 = new iTextSharp.text.pdf.PdfReader(filepath);
string outfile = filepath.Replace((System.IO.Path.GetFileName(filepath)), (System.IO.Path.GetFileName(filepath).Replace(".pdf", "") + "_" + i.ToString()) + ext);
reader1.RemoveUnusedObjects();
iTextSharp.text.Document doc = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(currentPage));
iTextSharp.text.pdf.PdfCopy pdfCpy = new iTextSharp.text.pdf.PdfCopy(doc, new System.IO.FileStream(outfile, System.IO.FileMode.Create));
doc.Open();
for (int j = 1; j <= 1; j++)
{
iTextSharp.text.pdf.PdfImportedPage page = pdfCpy.GetImportedPage(reader1, currentPage);
pdfCpy.SetFullCompression();
pdfCpy.AddPage(page);
currentPage += 1;
}
doc.Close();
pdfCpy.Close();
reader1.Close();
reader.Close();
}
}

You can use Ghostscript
to convert the PDF files into Images, I used the following parameters to convert the needed PDF into tiff image with multiple frames :
gswin32c.exe -sDEVICE=tiff12nc -dBATCH -r200 -dNOPAUSE -sOutputFile=[Output].tiff [PDF FileName]
Also you can use the -q parameter for silent mode
You can get more information about its output devices from here
After that I can easily load the tiff frames like the following
using (FileStream stream = new FileStream(#"C:\tEMP\image_$i.tiff", FileMode.Open, FileAccess.Read, FileShare.Read))
{
BitmapDecoder dec = BitmapDecoder.Create(stream, BitmapCreateOptions.IgnoreImageCache, BitmapCacheOption.None);
BitmapEncoder enc = BitmapEncoder.Create(dec.CodecInfo.ContainerFormat);
enc.Frames.Add(dec.Frames[frameIndex]);
}

I did it with MuPDFCore NuGet. Here is the link to guide I used : https://giorgiobianchini.com/MuPDFCore/MuPDFCore.pdf
using System;
using System.Threading.Tasks;
using MuPDFCore;
using VectSharp.Raster;
MuPDFContext context = new MuPDFContext();
MuPDFDocument document = new MuPDFDocument(context, #"C:\install\test.pdf");
//Renderers: one per page
MuPDFMultiThreadedPageRenderer[] renderers = new MuPDFMultiThreadedPageRenderer[document.Pages.Count];
//Page size: one per page
RoundedSize[] renderedPageSizes = new RoundedSize[document.Pages.Count];
//Boundaries of the tiles that make up each page: one array per page, with one element per thread
RoundedRectangle[][] tileBounds = new RoundedRectangle[document.Pages.Count][];
//Addresses of the memory areas where the image data of the tiles will be stored: one array per page, with one element per thread
IntPtr[][] destinations = new IntPtr[document.Pages.Count][];
//Cycle through the pages in the document to initialise everything
for (int i = 0; i < document.Pages.Count; i++)
{
//Initialise the renderer for the current page, using two threads (total number of threads: number of pages x 2
renderers[i] = document.GetMultiThreadedRenderer(i, 2);
//Determine the boundaries of the page when it is rendered with a 1.5x zoom factor
RoundedRectangle roundedBounds = document.Pages[i].Bounds.Round(2);//quality ..can use 0.5 ,1 etc.
renderedPageSizes[i] = new RoundedSize(roundedBounds.Width, roundedBounds.Height);
//Determine the boundaries of each tile by splitting the total size of the page by the number of threads.
tileBounds[i] = renderedPageSizes[i].Split(renderers[i].ThreadCount);
destinations[i] = new IntPtr[renderers[i].ThreadCount];
for (int j = 0; j < renderers[i].ThreadCount; j++)
{
//Allocate the required memory for the j-th tile of the i-th page.
//Since we will be rendering with a 24-bit-per-pixel format, the required memory in bytes is height x width x 3.
destinations[i][j] = System.Runtime.InteropServices.Marshal.AllocHGlobal(tileBounds[i][j].Height * tileBounds[i][j].Width * 3);
}
}
//Start the actual rendering operations in parallel.
Parallel.For(0, document.Pages.Count, i =>
{
renderers[i].Render(renderedPageSizes[i], document.Pages[i].Bounds, destinations[i], PixelFormats.RGB);
});
//The code in this for-loop is not really part of MuPDFCore - it just shows an example of using VectSharp to "stitch" the tiles up and produce the full image.
for (int i = 0; i < document.Pages.Count; i++)
{
//Create a new (empty) image to hold the whole page.
VectSharp.Page renderedPage = new VectSharp.Page(renderedPageSizes[i].Width,
renderedPageSizes[i].Height);
//Draw each tile onto the image.
for (int j = 0; j < renderers[i].ThreadCount; j++)
{
//Create a raster image object containing the pixel data. Yay, we do not need to copy/marshal anything!
VectSharp.RasterImage tile = new VectSharp.RasterImage(destinations[i][j], tileBounds[i][j].Width,
tileBounds[i][j].Height, false, false);
//Draw the tile on the main image page.
renderedPage.Graphics.DrawRasterImage(tileBounds[i][j].X0, tileBounds[i][j].Y0, tile);
}
//Save the full page as a PNG image.
renderedPage.SaveAsPNG(#"C:\install\page"+ i.ToString() + ".png");
}
//Clean-up code.
for (int i = 0; i < document.Pages.Count; i++)
{
//Release the allocated memory.
for (int j = 0; j < renderers[i].ThreadCount; j++)
{
System.Runtime.InteropServices.Marshal.FreeHGlobal(destinations[i][j]);
}
//Release the renderer (if you skip this, the quiescent renderer’s threads will not be stopped, and your application will never exit!
renderers[i].Dispose();
}
document.Dispose();
context.Dispose();
}

you can extract Image from PDF
and save as JPG
here is the sample code
you need Itext Sharp
public IEnumerable<System.Drawing.Image> ExtractImagesFromPDF(string sourcePdf)
{
// NOTE: This will only get the first image it finds per page.
var pdf = new PdfReader(sourcePdf);
var raf = new RandomAccessFileOrArray(sourcePdf);
try
{
for (int pageNum = 1; pageNum <= pdf.NumberOfPages; pageNum++)
{
PdfDictionary pg = pdf.GetPageN(pageNum);
// recursively search pages, forms and groups for images.
PdfObject obj = ExtractImagesFromPDF_FindImageInPDFDictionary(pg);
if (obj != null)
{
int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(CultureInfo.InvariantCulture));
PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);
PdfStream pdfStrem = (PdfStream)pdfObj;
PdfImageObject pdfImage = new PdfImageObject((PRStream)pdfStrem);
System.Drawing.Image img = pdfImage.GetDrawingImage();
yield return img;
}
}
}
finally
{
pdf.Close();
raf.Close();
}
}