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linear image stitching using emgu.cv in c#

I have a device that rotates an object and takes a picture of a portion of the object at regular intervals. Currently, I have 30 pictures. To stitch the images into a flat image, I am taking a slice right out of the center of each picture of a fixed width (between 50 and 75 pixels). I am trying to stitch these slices together into a flat image of the original picture using the EMGU CV Stitching library with the sample stitching code that comes with EMGU. I am testing with between 5 and 10 slices at a time. Sometimes, I am getting an error that says "Error, need more images". When I do get a result, it looks terrible with weird curvatures. I don't need any spatial adjustments. I just want to stitch them in a linear fashion from left to right. Any ideas, either using EMGU or other?
Here are a few slices and the result:
Why is the resulting image not the same height as the 4 slices? What must be done just to stitch these together in a linear fashion so that the text is continuous?
Here is the code I am using:
private void selectImagesButton_Click(object sender, EventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.CheckFileExists = true;
dlg.Multiselect = true;
if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
sourceImageDataGridView.Rows.Clear();
Image<Bgr, byte>[] sourceImages = new Image<Bgr, byte>[dlg.FileNames.Length];
for (int i = 0; i < sourceImages.Length; i++)
{
sourceImages[i] = new Image<Bgr, byte>(dlg.FileNames[i]);
using (Image<Bgr, byte> thumbnail = sourceImages[i].Resize(200, 200, Emgu.CV.CvEnum.Inter.Cubic, true))
{
DataGridViewRow row = sourceImageDataGridView.Rows[sourceImageDataGridView.Rows.Add()];
row.Cells["FileNameColumn"].Value = dlg.FileNames[i];
row.Cells["ThumbnailColumn"].Value = thumbnail.ToBitmap();
row.Height = 200;
}
}
try
{
//only use GPU if you have build the native binary from code and enabled "NON_FREE"
using (Stitcher stitcher = new Stitcher(false))
{
using (AKAZEFeaturesFinder finder = new AKAZEFeaturesFinder())
{
stitcher.SetFeaturesFinder(finder);
using (VectorOfMat vm = new VectorOfMat())
{
Mat result = new Mat();
vm.Push(sourceImages);
Stopwatch watch = Stopwatch.StartNew();
this.Text = "Stitching";
Stitcher.Status stitchStatus = stitcher.Stitch(vm, result);
watch.Stop();
if (stitchStatus == Stitcher.Status.Ok)
{
resultImageBox.Image = result;
this.Text = String.Format("Stitched in {0} milliseconds.", watch.ElapsedMilliseconds);
}
else
{
MessageBox.Show(this, String.Format("Stiching Error: {0}", stitchStatus));
resultImageBox.Image = null;
}
}
}
}
}
finally
{
foreach (Image<Bgr, Byte> img in sourceImages)
{
img.Dispose();
}
}
}
}

how to set capture source of AudioVideoCaptureDevice on Windows Phone

I'm trying to capture video on Windows Phone using the AudioVideoCaptureDevice but when I try to set the captureSource I get a error message saying " Operation not valid due to the state of the object". Can you tell me what to do right in the following code?
Code snippet:
// Viewfinder for capturing video.
private VideoBrush videoRecorderBrush;
// Source and device for capturing video.
private CaptureSource _cs;
private VideoCaptureDevice _cd;
private AudioVideoCaptureDevice vcDevice;
double w, h;
// File details for storing the recording.
private IsolatedStorageFileStream isoVideoFile;
private FileSink fileSink;
private string isoVideoFileName = "iClips_Video.mp4";
private StorageFile sfVideoFile;
// For managing button and application state.
private enum ButtonState { Initialized, Stopped, Ready, Recording, Playback, Paused, NoChange, CameraNotSupported };
private ButtonState currentAppState;
// Constructor
public MainPage()
{
try
{
InitializeComponent();
//setup recording
// Prepare ApplicationBar and buttons.
PhoneAppBar = (ApplicationBar)ApplicationBar;
PhoneAppBar.IsVisible = true;
StartRecording = ((ApplicationBarIconButton)ApplicationBar.Buttons[0]);
StopPlaybackRecording = ((ApplicationBarIconButton)ApplicationBar.Buttons[1]);
StartPlayback = ((ApplicationBarIconButton)ApplicationBar.Buttons[2]);
PausePlayback = ((ApplicationBarIconButton)ApplicationBar.Buttons[3]);
SetScreenResolution();
//initialize the camera task
cameraCaptureTask = new CameraCaptureTask();
cameraCaptureTask.Completed += new EventHandler<PhotoResult>(cameraCaptureTask_Completed);
if (isFilePresent("username") && isFilePresent("Password"))
{
if (isFilePresent("IsProfilePhotoOnServer"))
{
connectToSocket();
}
else
{
SignUpProfilePhoto();
}
}
else
{
SignIn();
}
}
catch (Exception ex)
{
this.Dispatcher.BeginInvoke(delegate()
{
MessageBox.Show("Constructor Error:\n"+ ex.Message);
});
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
// Initialize the video recorder.
InitializeVideoRecorder();
//prepare shutter hot keys
CameraButtons.ShutterKeyHalfPressed += OnButtonHalfPress;
CameraButtons.ShutterKeyPressed += OnButtonFullPress;
CameraButtons.ShutterKeyReleased += OnButtonRelease;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
// Dispose of camera and media objects.
DisposeVideoPlayer();
DisposeVideoRecorder();
base.OnNavigatedFrom(e);
CameraButtons.ShutterKeyHalfPressed -= OnButtonHalfPress;
CameraButtons.ShutterKeyPressed -= OnButtonFullPress;
CameraButtons.ShutterKeyReleased -= OnButtonRelease;
}
protected override void OnOrientationChanged(OrientationChangedEventArgs e)
{
if (vcDevice != null)
{
if (e.Orientation == PageOrientation.LandscapeLeft)
{
txtDebug.Text = "LandscapeLeft";
videoRecorderBrush.RelativeTransform =
new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 90 };
//rotate logo
if (logo != null)
{
RotateTransform rt = new RotateTransform();
rt.Angle = 90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
logo.RenderTransformOrigin = new Point(0.5, 0.5);
logo.RenderTransform = rt;
}
//rotate sign in link
if (MyGrid != null)
{
RotateTransform rt = new RotateTransform();
rt.Angle = 90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
MyGrid.RenderTransformOrigin = new Point(0.5, 0.5);
MyGrid.RenderTransform = rt;
}
}
if (e.Orientation == PageOrientation.PortraitUp)
{
txtDebug.Text = "PortraitUp";
videoRecorderBrush.RelativeTransform =
new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 90 };
//rotate logo
if (logo != null)
{
RotateTransform rt = new RotateTransform();
rt.Angle = 0;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
logo.RenderTransformOrigin = new Point(0.5, 0.5);
logo.RenderTransform = rt;
}
//rotate sign in link
if (MyGrid != null)
{
RotateTransform rt = new RotateTransform();
rt.Angle = 0;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
MyGrid.RenderTransformOrigin = new Point(0.5, 0.5);
MyGrid.RenderTransform = rt;
}
}
if (e.Orientation == PageOrientation.LandscapeRight)
{
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = "LandscapeRight";
// Rotate for LandscapeRight orientation.
//videoRecorderBrush.RelativeTransform =
//new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 180 };
//rotate logo
if (logo != null)
{
RotateTransform rt = new RotateTransform();
rt.Angle = -90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
logo.RenderTransformOrigin = new Point(0.5, 0.5);
logo.RenderTransform = rt;
}
//rotate MyGrid
if (MyGrid != null)
{
RotateTransform rt = new RotateTransform();
rt.Angle = -90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
MyGrid.RenderTransformOrigin = new Point(0.5, 0.5);
MyGrid.RenderTransform = rt;
}
});
}
if (e.Orientation == PageOrientation.PortraitDown)
{
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = "PortraitDown";
videoRecorderBrush.RelativeTransform =
new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 270 };
});
}
}
}
// Hardware shutter button Hot-Actions.
private void OnButtonHalfPress(object sender, EventArgs e)
{
//toggle between video- play and pause
try
{
this.Dispatcher.BeginInvoke(delegate()
{
if (StartPlayback.IsEnabled)
{
PlayVideo();
}
if (PausePlayback.IsEnabled)
{
PauseVideo();
}
});
}
catch (Exception focusError)
{
// Cannot focus when a capture is in progress.
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = focusError.Message;
});
}
}
private void OnButtonFullPress(object sender, EventArgs e)
{
// Focus when a capture is not in progress.
try
{
this.Dispatcher.BeginInvoke(delegate()
{
if (vcDevice != null)
{
//stopVideoPlayer if it's playing back
if (currentAppState == ButtonState.Playback || currentAppState == ButtonState.Paused)
{
DisposeVideoPlayer();
StartVideoPreview();
}
if (StartRecording.IsEnabled)
{
StartVideoRecording();
}
else
{
StopVideoRecording();
}
}
});
}
catch (Exception focusError)
{
// Cannot focus when a capture is in progress.
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = focusError.Message;
});
}
}
private void OnButtonRelease(object sender, EventArgs e)
{
try
{
this.Dispatcher.BeginInvoke(delegate()
{
});
}
catch (Exception focusError)
{
// Cannot focus when a capture is in progress.
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = focusError.Message;
});
}
}
// Update the buttons and text on the UI thread based on app state.
private void UpdateUI(ButtonState currentButtonState, string statusMessage)
{
// Run code on the UI thread.
Dispatcher.BeginInvoke(delegate
{
switch (currentButtonState)
{
// When the camera is not supported by the phone.
case ButtonState.CameraNotSupported:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = false;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = false;
break;
// First launch of the application, so no video is available.
case ButtonState.Initialized:
StartRecording.IsEnabled = true;
StopPlaybackRecording.IsEnabled = false;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = false;
break;
// Ready to record, so video is available for viewing.
case ButtonState.Ready:
StartRecording.IsEnabled = true;
StopPlaybackRecording.IsEnabled = false;
StartPlayback.IsEnabled = true;
PausePlayback.IsEnabled = false;
break;
// Video recording is in progress.
case ButtonState.Recording:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = true;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = false;
break;
// Video playback is in progress.
case ButtonState.Playback:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = true;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = true;
break;
// Video playback has been paused.
case ButtonState.Paused:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = true;
StartPlayback.IsEnabled = true;
PausePlayback.IsEnabled = false;
break;
default:
break;
}
// Display a message.
txtDebug.Text = statusMessage;
// Note the current application state.
currentAppState = currentButtonState;
});
}
public async void InitializeVideoRecorder()
{
try
{
if (_cs == null)
{
_cs = new CaptureSource();
fileSink = new FileSink();
_cd = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();
CameraSensorLocation location = CameraSensorLocation.Back;
var captureResolutions =
AudioVideoCaptureDevice.GetAvailableCaptureResolutions(location);
vcDevice = await AudioVideoCaptureDevice.OpenAsync(location, captureResolutions[0]);
vcDevice.RecordingFailed += OnCaptureFailed;
vcDevice.VideoEncodingFormat = CameraCaptureVideoFormat.H264;
vcDevice.AudioEncodingFormat = CameraCaptureAudioFormat.Aac;
// Initialize the camera if it exists on the phone.
if (vcDevice != null)
{
//initialize fileSink
await InitializeFileSink();
// Create the VideoBrush for the viewfinder.
videoRecorderBrush = new VideoBrush();
videoRecorderBrush.SetSource(_cs);
// Display the viewfinder image on the rectangle.
viewfinderRectangle.Fill = videoRecorderBrush;
_cs.Start();
// Set the button state and the message.
UpdateUI(ButtonState.Initialized, "Tap record to start recording...");
}
else
{
// Disable buttons when the camera is not supported by the phone.
UpdateUI(ButtonState.CameraNotSupported, "A camera is not supported on this phone.");
}
}
}
catch(Exception ex)
{
MessageBox.Show("InitializeVideoRecorder Error:\n" + ex.Message);
}
}
public async Task InitializeFileSink()
{
StorageFolder isoStore = ApplicationData.Current.LocalFolder;
sfVideoFile = await isoStore.CreateFileAsync(
isoVideoFileName,
CreationCollisionOption.ReplaceExisting);
}
private void OnCaptureFailed(AudioVideoCaptureDevice sender, CaptureFailedEventArgs args)
{
MessageBox.Show(args.ToString());
}
private void OnCaptureSourceFailed(object sender, ExceptionRoutedEventArgs e)
{
MessageBox.Show(e.ErrorException.Message.ToString());
}
// Set the recording state: display the video on the viewfinder.
private void StartVideoPreview()
{
try
{
// Display the video on the viewfinder.
if (_cs.VideoCaptureDevice != null
&& _cs.State == CaptureState.Stopped)
{
// Add captureSource to videoBrush.
videoRecorderBrush.SetSource(_cs);
// Add videoBrush to the visual tree.
viewfinderRectangle.Fill = videoRecorderBrush;
_cs.Start();
// Set the button states and the message.
UpdateUI(ButtonState.Ready, "Ready to record.");
//Create optional Resolutions
}
}
// If preview fails, display an error.
catch (Exception e)
{
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = "ERROR: " + e.Message.ToString();
});
}
}
// Set recording state: start recording.
private void StartVideoRecording()
{
try
{
// Connect fileSink to captureSource.
if (_cs.VideoCaptureDevice != null
&& _cs.State == CaptureState.Started)
{
_cs.Stop();
// Connect the input and output of fileSink.
fileSink.CaptureSource = _cs;
fileSink.IsolatedStorageFileName = isoVideoFileName;
}
// Begin recording.
if (_cs.VideoCaptureDevice != null
&& _cs.State == CaptureState.Stopped)
{
_cs.Start();
}
// Set the button states and the message.
UpdateUI(ButtonState.Recording, "Recording...");
StartTimer();
}
// If recording fails, display an error.
catch (Exception e)
{
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = "ERROR: " + e.Message.ToString();
});
}
}
// Set the recording state: stop recording.
private void StopVideoRecording()
{
try
{
// Stop recording.
if (_cs.VideoCaptureDevice != null
&& _cs.State == CaptureState.Started)
{
_cs.Stop();
// Disconnect fileSink.
fileSink.CaptureSource = null;
fileSink.IsolatedStorageFileName = null;
// Set the button states and the message.
UpdateUI(ButtonState.Stopped, "Preparing viewfinder...");
StopTimer();
StartVideoPreview();
}
}
// If stop fails, display an error.
catch (Exception e)
{
this.Dispatcher.BeginInvoke(delegate()
{
txtDebug.Text = "ERROR: " + e.Message.ToString();
});
}
}
// Start the video recording.
private void StartRecording_Click(object sender, EventArgs e)
{
// Avoid duplicate taps.
StartRecording.IsEnabled = false;
StartVideoRecording();
}
private void DisposeVideoRecorder()
{
if (_cs != null)
{
// Stop captureSource if it is running.
if (_cs.VideoCaptureDevice != null
&& _cs.State == CaptureState.Started)
{
_cs.Stop();
}
// Remove the event handler for captureSource.
_cs.CaptureFailed -= OnCaptureFailed;
// Remove the video recording objects.
_cs = null;
vcDevice = null;
fileSink = null;
videoRecorderBrush = null;
}
}
private void OnCaptureFailed(object sender, ExceptionRoutedEventArgs e)
{
throw new NotImplementedException();
}
//STOP WATCH
private void StartTimer()
{
dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
dispatcherTimer.Start();
startTime = System.DateTime.Now;
}
private void StopTimer()
{
dispatcherTimer.Stop();
}
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
System.DateTime now = System.DateTime.Now;
txtRecTime.Text = now.Subtract(startTime).ToString();
}
the error is thrown inside initializeVideoRecorder().

Seems like you're code is too long to analyze as #john mentioned in the comment. But since you've suggested to post some helpful links here you go: Following these steps here in msdn, would work without any issues as I've tried it once.
If you really need a sample to kick off, there's one from msdn. Hope you'll maximize the utilities.

I figured out I have to pass the capture device to the videobrush to make it work. I'm still not sure where and if I should use CaptureSource when capturing with AudioVideoCaptureDevice. Anyway here is the solution code:
// Create the VideoBrush for the viewfinder.
videoRecorderBrush = new VideoBrush();
videoRecorderBrush.SetSource(vcDevice); //substitute vcDevice with captureSource - vcDevice is the reference of AudioVideoCaptureDevice
// Display the viewfinder image on the rectangle.
viewfinderRectangle.Fill = videoRecorderBrush;

Video feed flickering/flying in C# using EmguCV

I am creating a program that can dump individual frames from a video feed for a drones competition. I am having a problem where by the wireless video stream coming form the drone is flickering and flying all over the place.
I am using this code to capture the video stream:
Capture _capture;
Emgu.CV.Image<Emgu.CV.Structure.Bgr,byte> frame;
void StartCamera()
{
_capture = null;
_capture = new Capture((int)nudCamera.Value);
_capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FPS, FrameRate);
_capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT, FrameHeight);
_capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH, FrameWidth);
webcam_frm_cnt = 0;
cam = 1;
Video_seek = 0;
System.Windows.Forms.Application.Idle += ProcessFrame;
}
private void ProcessFrame(object sender, EventArgs arg)
{
try
{
Framesno = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES);
frame = _capture.QueryFrame();
if (frame != null)
{
pictureBox1.Image = frame.ToBitmap();
if (cam == 0)
{
Video_seek = (int)(Framesno);
double time_index = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_MSEC);
//Time_Label.Text = "Time: " + TimeSpan.FromMilliseconds(time_index).ToString().Substring(0, 8);
double framenumber = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES);
//Frame_lbl.Text = "Frame: " + framenumber.ToString();
Thread.Sleep((int)(1000.0 / FrameRate));
}
if (cam == 1)
{
//Frame_lbl.Text = "Frame: " + (webcam_frm_cnt++).ToString();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
}
Is there a setting somewhere that I am missing?
This video stream flickering seems to happen in other programs too however it fixes itself when you fiddle with the video setting (NTSC/PAL settings)
Edit: So I need to be able to put the video stream into NTSC /M mode, is this possible with EmguCV? If so how do I do it?
Edit 2: All documents that I have read point towards it being completely and utterly impossible to change the video type and that there is no documentation on this topic. I would love to be proved wrong :)
Thanks in advanced

This sourceforge link tells you how to set the video mode.

Generate, display and print simple document in .NET

I want to do very common task in C# but I cannot figure how: My application will generate document with a lot of text and some pictures, let user preview the result and then let him print it.
What is the easiest way to do it? I take the text that I put to the document from database.
Remarks:
I do not care if the GUI will be WPF or Windows Forms.
I prefer some ready-to-use component for displaying preview, I don't want to create my own.
Preview must be exactly the same as the printed result.
Nowbody seems to be able to answer https://stackoverflow.com/questions/4634445/how-to-work-with-fixedpage

Maybe this example will help you. This is actually based on WindowsForms and comes partially from MSDN. Use the below code like:
using (Printer p = new Printer(this.richTextBox.Text, 1)) { }
Here it takes text from the richTextBox, but you can put any string there.
Create a new Form in your application and add the following code:
using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Printing;
namespace PrinterExample
{
public partial class Printer : Form
{
private string textToDisplay;
private Font printFont;
private StreamReader streamToPrint;
private int mode;
//mode 1 - Preview, 2 - Print
public Printer(string textToDisplay,int mode)
{
this.textToDisplay = textToDisplay;
this.mode = mode;
InitializeComponent();
PreviewPage();
}
internal void PreviewPage()
{
try
{
streamToPrint = new StreamReader(new MemoryStream(Encoding.ASCII.GetBytes(textToDisplay)));
printFont = DefaultFont;
PrintDocument pd = new PrintDocument();
pd.PrintPage += new PrintPageEventHandler
(this.pd_PrintPage);
var ppd = new PrintPreviewDialog();
ppd.Document = pd;
if (mode == 1) ppd.Show();
if (mode == 2) pd.Print();
}
catch
{
MessageBox.Show("Exception occured", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void pd_PrintPage(object sender, PrintPageEventArgs ev)
{
float linesPerPage = 0;
float yPos = 0;
int count = 0;
float leftMargin = ev.MarginBounds.Left;
float rightMargin = ev.MarginBounds.Right;
float topMargin = ev.MarginBounds.Top;
string line = null;
// Calculate the number of lines per page.
linesPerPage = ev.MarginBounds.Height /
printFont.GetHeight(ev.Graphics);
float charsPerLine = (rightMargin - leftMargin) / (printFont.GetHeight(ev.Graphics)*0.65f);
// Print each line of the file.
while (count < linesPerPage &&
((line = streamToPrint.ReadLine()) != null))
{
string newLine = null;
int newLineCounter = 0;
for (int i = 0; i < line.Length; i++)
{
if (i % (int)charsPerLine == 0)
{
newLine = line.Substring((int)charsPerLine * newLineCounter, (int)charsPerLine > (line.Length - (int)charsPerLine * newLineCounter) ? (line.Length - (int)charsPerLine * newLineCounter) : (int)charsPerLine);
yPos = topMargin + (count *
printFont.GetHeight(ev.Graphics));
ev.Graphics.DrawString(newLine, printFont, Brushes.Black,
leftMargin, yPos, new StringFormat());
count++;
newLineCounter++;
}
}
newLineCounter = 0;
}
// If more lines exist, print another page.
if (line != null)
ev.HasMorePages = true;
else
ev.HasMorePages = false;
}
private void Printer_FormClosing(object sender, FormClosingEventArgs e)
{
this.streamToPrint.Close();
}
}
Be aware that for proffesional printing most people use external tools like Crystal Reports. I am not sure if you can modify this example to print images.

One option is to use built-in .rdlc reports for you task
http://msdn.microsoft.com/en-us/library/ms252067(v=VS.90).aspx

Drasto,
I created a rather complex custom printing tool that might be useful.
PrintPage PrintPageEventHandler Is Printing Too Many Copies
Feel free to steal as much of that code of mine as you want.

Opencv Emgu c# face extraction

So far I have managed to make my programme to work and detect face and now what i want to do is that extract the area detected and display in new picture box that i have added also after this is done i want to add pics to database and compare detected faces with them.
So please help
private void ProcessFrame(object sender, EventArgs arg)
{
Image<Bgr, Byte> frame = _capture.QueryFrame();
Image<Gray, Byte> gray = frame.Convert<Gray, Byte>(); //Convert it to Grayscale
//normalizes brightness and increases contrast of the image
gray._EqualizeHist();
//Read the HaarCascade objects
HaarCascade face = new HaarCascade("haarcascade_frontalface_alt_tree.xml");
HaarCascade eye = new HaarCascade("haarcascade_eye.xml");
//Detect the faces from the gray scale image and store the locations as rectangle
//The first dimensional is the channel
//The second dimension is the index of the rectangle in the specific channel
MCvAvgComp[][] facesDetected = gray.DetectHaarCascade(
face,
1.1,
10,
Emgu.CV.CvEnum.HAAR_DETECTION_TYPE.DO_ROUGH_SEARCH,
new Size(20, 20));
foreach (MCvAvgComp f in facesDetected[0])
{
//draw the face detected in the 0th (gray) channel with blue color
frame.Draw(f.rect, new Bgr(Color.Blue), 2);
/*
//Set the region of interest on the faces
gray.ROI = f.rect;
MCvAvgComp[][] eyesDetected = gray.DetectHaarCascade(
eye,
1.1,
10,
Emgu.CV.CvEnum.HAAR_DETECTION_TYPE.DO_ROUGH_SEARCH,
new Size(20, 20));
gray.ROI = Rectangle.Empty;
foreach (MCvAvgComp e in eyesDetected[0])
{
Rectangle eyeRect = e.rect;
eyeRect.Offset(f.rect.X, f.rect.Y);
frame.Draw(eyeRect, new Bgr(Color.Red), 2);
}*/
}
pictureBox1.Image = frame.ToBitmap();Application.DoEvents();
}
private void button1_Click(object sender, EventArgs e)
{
#region if capture is not created, create it now
if (_capture == null)
{
try
{
_capture = new Capture();
}
catch (NullReferenceException excpt)
{
MessageBox.Show(excpt.Message);
}
}
#endregion
if (_capture != null)
{
if (_captureInProgress)
{ //stop the capture
button1.Text = "Start Capture";
Application.Idle -= ProcessFrame;
}
else
{
//start the capture
button1.Text = "Stop";
Application.Idle += ProcessFrame;
}
_captureInProgress = !_captureInProgress;
}
}

I have managed to do that but i am placing this answer to help others if they are in same trouble
gray.ROI = f.rect;
and then you can assign gray to any picture box this will show only detected area