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Image Processing for Dummies with C# and GDI+ Part 2 - Convolution Filters

, 7 Nov 2005 CPOL
The second in a series of articles which will build an image processing library in C# and GDI+.
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace CSharpFilters
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Drawing.Bitmap m_Bitmap;
		private System.Drawing.Bitmap m_Undo;
		private System.Windows.Forms.MainMenu mainMenu1;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem menuItem4;
		private System.Windows.Forms.MenuItem FileLoad;
		private System.Windows.Forms.MenuItem FileSave;
		private System.Windows.Forms.MenuItem FileExit;
		private System.Windows.Forms.MenuItem FilterInvert;
		private System.Windows.Forms.MenuItem FilterGrayScale;
		private System.Windows.Forms.MenuItem FilterBrightness;
		private System.Windows.Forms.MenuItem FilterContrast;
		private System.Windows.Forms.MenuItem FilterGamma;
		private System.Windows.Forms.MenuItem FilterColor;
		private System.Windows.Forms.MenuItem menuItem2;
		private System.Windows.Forms.MenuItem Zoom25;
		private double Zoom = 1.0;
		private System.Windows.Forms.MenuItem Zoom50;
		private System.Windows.Forms.MenuItem Zoom100;
		private System.Windows.Forms.MenuItem Zoom150;
		private System.Windows.Forms.MenuItem Zoom200;
		private System.Windows.Forms.MenuItem Zoom300;
		private System.Windows.Forms.MenuItem Zoom500;
		private System.Windows.Forms.MenuItem menuItem3;
		private System.Windows.Forms.MenuItem FilterSmooth;
		private System.Windows.Forms.MenuItem GaussianBlur;
		private System.Windows.Forms.MenuItem MeanRemoval;
		private System.Windows.Forms.MenuItem Sharpen;
		private System.Windows.Forms.MenuItem EmbossLaplacian;
		private System.Windows.Forms.MenuItem EdgeDetectQuick;
		private System.Windows.Forms.MenuItem menuItem5;
		private System.Windows.Forms.MenuItem Undo;
		private System.Windows.Forms.MenuItem FilterCustom;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			InitializeComponent();

			m_Bitmap= new Bitmap(2, 2);
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.mainMenu1 = new System.Windows.Forms.MainMenu();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.FileLoad = new System.Windows.Forms.MenuItem();
			this.FileSave = new System.Windows.Forms.MenuItem();
			this.FileExit = new System.Windows.Forms.MenuItem();
			this.menuItem5 = new System.Windows.Forms.MenuItem();
			this.Undo = new System.Windows.Forms.MenuItem();
			this.menuItem4 = new System.Windows.Forms.MenuItem();
			this.FilterInvert = new System.Windows.Forms.MenuItem();
			this.FilterGrayScale = new System.Windows.Forms.MenuItem();
			this.FilterBrightness = new System.Windows.Forms.MenuItem();
			this.FilterContrast = new System.Windows.Forms.MenuItem();
			this.FilterGamma = new System.Windows.Forms.MenuItem();
			this.FilterColor = new System.Windows.Forms.MenuItem();
			this.menuItem3 = new System.Windows.Forms.MenuItem();
			this.FilterSmooth = new System.Windows.Forms.MenuItem();
			this.GaussianBlur = new System.Windows.Forms.MenuItem();
			this.MeanRemoval = new System.Windows.Forms.MenuItem();
			this.Sharpen = new System.Windows.Forms.MenuItem();
			this.EmbossLaplacian = new System.Windows.Forms.MenuItem();
			this.EdgeDetectQuick = new System.Windows.Forms.MenuItem();
			this.menuItem2 = new System.Windows.Forms.MenuItem();
			this.Zoom25 = new System.Windows.Forms.MenuItem();
			this.Zoom50 = new System.Windows.Forms.MenuItem();
			this.Zoom100 = new System.Windows.Forms.MenuItem();
			this.Zoom150 = new System.Windows.Forms.MenuItem();
			this.Zoom200 = new System.Windows.Forms.MenuItem();
			this.Zoom300 = new System.Windows.Forms.MenuItem();
			this.Zoom500 = new System.Windows.Forms.MenuItem();
			this.FilterCustom = new System.Windows.Forms.MenuItem();
			// 
			// mainMenu1
			// 
			this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menuItem1,
																					  this.menuItem5,
																					  this.menuItem4,
																					  this.menuItem3,
																					  this.menuItem2});
			// 
			// menuItem1
			// 
			this.menuItem1.Index = 0;
			this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.FileLoad,
																					  this.FileSave,
																					  this.FileExit});
			this.menuItem1.Text = "File";
			// 
			// FileLoad
			// 
			this.FileLoad.Index = 0;
			this.FileLoad.Shortcut = System.Windows.Forms.Shortcut.CtrlL;
			this.FileLoad.Text = "Load";
			this.FileLoad.Click += new System.EventHandler(this.File_Load);
			// 
			// FileSave
			// 
			this.FileSave.Index = 1;
			this.FileSave.Shortcut = System.Windows.Forms.Shortcut.CtrlS;
			this.FileSave.Text = "Save";
			this.FileSave.Click += new System.EventHandler(this.File_Save);
			// 
			// FileExit
			// 
			this.FileExit.Index = 2;
			this.FileExit.Text = "Exit";
			this.FileExit.Click += new System.EventHandler(this.File_Exit);
			// 
			// menuItem5
			// 
			this.menuItem5.Index = 1;
			this.menuItem5.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.Undo});
			this.menuItem5.Text = "Edit";
			// 
			// Undo
			// 
			this.Undo.Index = 0;
			this.Undo.Text = "Undo";
			this.Undo.Click += new System.EventHandler(this.OnUndo);
			// 
			// menuItem4
			// 
			this.menuItem4.Index = 2;
			this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.FilterInvert,
																					  this.FilterGrayScale,
																					  this.FilterBrightness,
																					  this.FilterContrast,
																					  this.FilterGamma,
																					  this.FilterColor});
			this.menuItem4.Text = "Filter";
			// 
			// FilterInvert
			// 
			this.FilterInvert.Index = 0;
			this.FilterInvert.Text = "Invert";
			this.FilterInvert.Click += new System.EventHandler(this.Filter_Invert);
			// 
			// FilterGrayScale
			// 
			this.FilterGrayScale.Index = 1;
			this.FilterGrayScale.Text = "GrayScale";
			this.FilterGrayScale.Click += new System.EventHandler(this.Filter_GrayScale);
			// 
			// FilterBrightness
			// 
			this.FilterBrightness.Index = 2;
			this.FilterBrightness.Text = "Brightness";
			this.FilterBrightness.Click += new System.EventHandler(this.Filter_Brightness);
			// 
			// FilterContrast
			// 
			this.FilterContrast.Index = 3;
			this.FilterContrast.Text = "Contrast";
			this.FilterContrast.Click += new System.EventHandler(this.Filter_Contrast);
			// 
			// FilterGamma
			// 
			this.FilterGamma.Index = 4;
			this.FilterGamma.Text = "Gamma";
			this.FilterGamma.Click += new System.EventHandler(this.Filter_Gamma);
			// 
			// FilterColor
			// 
			this.FilterColor.Index = 5;
			this.FilterColor.Text = "Color";
			this.FilterColor.Click += new System.EventHandler(this.Filter_Color);
			// 
			// menuItem3
			// 
			this.menuItem3.Index = 3;
			this.menuItem3.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.FilterSmooth,
																					  this.GaussianBlur,
																					  this.MeanRemoval,
																					  this.Sharpen,
																					  this.EmbossLaplacian,
																					  this.EdgeDetectQuick,
																					  this.FilterCustom});
			this.menuItem3.Text = "Convolution";
			// 
			// FilterSmooth
			// 
			this.FilterSmooth.Index = 0;
			this.FilterSmooth.Text = "Smooth";
			this.FilterSmooth.Click += new System.EventHandler(this.OnFilterSmooth);
			// 
			// GaussianBlur
			// 
			this.GaussianBlur.Index = 1;
			this.GaussianBlur.Text = "Gaussian Blur";
			this.GaussianBlur.Click += new System.EventHandler(this.OnGaussianBlur);
			// 
			// MeanRemoval
			// 
			this.MeanRemoval.Index = 2;
			this.MeanRemoval.Text = "Mean Removal";
			this.MeanRemoval.Click += new System.EventHandler(this.OnMeanRemoval);
			// 
			// Sharpen
			// 
			this.Sharpen.Index = 3;
			this.Sharpen.Text = "Sharpen";
			this.Sharpen.Click += new System.EventHandler(this.OnSharpen);
			// 
			// EmbossLaplacian
			// 
			this.EmbossLaplacian.Index = 4;
			this.EmbossLaplacian.Text = "EmbossLaplacian";
			this.EmbossLaplacian.Click += new System.EventHandler(this.OnEmbossLaplacian);
			// 
			// EdgeDetectQuick
			// 
			this.EdgeDetectQuick.Index = 5;
			this.EdgeDetectQuick.Text = "EdgeDetectQuick";
			this.EdgeDetectQuick.Click += new System.EventHandler(this.OnEdgeDetectQuick);
			// 
			// menuItem2
			// 
			this.menuItem2.Index = 4;
			this.menuItem2.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.Zoom25,
																					  this.Zoom50,
																					  this.Zoom100,
																					  this.Zoom150,
																					  this.Zoom200,
																					  this.Zoom300,
																					  this.Zoom500});
			this.menuItem2.Text = "Zoom";
			// 
			// Zoom25
			// 
			this.Zoom25.Index = 0;
			this.Zoom25.Text = "25%";
			this.Zoom25.Click += new System.EventHandler(this.OnZoom25);
			// 
			// Zoom50
			// 
			this.Zoom50.Index = 1;
			this.Zoom50.Text = "50%";
			this.Zoom50.Click += new System.EventHandler(this.OnZoom50);
			// 
			// Zoom100
			// 
			this.Zoom100.Index = 2;
			this.Zoom100.Text = "100%";
			this.Zoom100.Click += new System.EventHandler(this.OnZoom100);
			// 
			// Zoom150
			// 
			this.Zoom150.Index = 3;
			this.Zoom150.Text = "150%";
			this.Zoom150.Click += new System.EventHandler(this.OnZoom150);
			// 
			// Zoom200
			// 
			this.Zoom200.Index = 4;
			this.Zoom200.Text = "200%";
			this.Zoom200.Click += new System.EventHandler(this.OnZoom200);
			// 
			// Zoom300
			// 
			this.Zoom300.Index = 5;
			this.Zoom300.Text = "300%";
			this.Zoom300.Click += new System.EventHandler(this.OnZoom300);
			// 
			// Zoom500
			// 
			this.Zoom500.Index = 6;
			this.Zoom500.Text = "500%";
			this.Zoom500.Click += new System.EventHandler(this.OnZoom500);
			// 
			// FilterCustom
			// 
			this.FilterCustom.Index = 6;
			this.FilterCustom.Text = "Custom";
			this.FilterCustom.Click += new System.EventHandler(this.OnFilterCustom);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.BackColor = System.Drawing.SystemColors.ControlLightLight;
			this.ClientSize = new System.Drawing.Size(488, 421);
			this.Menu = this.mainMenu1;
			this.Name = "Form1";
			this.Text = "Graphic Filters For Dummies";
			this.Load += new System.EventHandler(this.Form1_Load);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		protected override void OnPaint (PaintEventArgs e)
		{
			Graphics g = e.Graphics;

			g.DrawImage(m_Bitmap, new Rectangle(this.AutoScrollPosition.X, this.AutoScrollPosition.Y, (int)(m_Bitmap.Width*Zoom), (int)(m_Bitmap.Height * Zoom)));
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
		}

		private void File_Load(object sender, System.EventArgs e)
		{
			OpenFileDialog openFileDialog = new OpenFileDialog();

			openFileDialog.InitialDirectory = "c:\\" ;
			openFileDialog.Filter = "Bitmap files (*.bmp)|*.bmp|Jpeg files (*.jpg)|*.jpg|All valid files (*.bmp/*.jpg)|*.bmp/*.jpg";
			openFileDialog.FilterIndex = 2 ;
			openFileDialog.RestoreDirectory = true ;

			if(DialogResult.OK == openFileDialog.ShowDialog())
			{
				m_Bitmap = (Bitmap)Bitmap.FromFile(openFileDialog.FileName, false);
				this.AutoScroll = true;
				this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
				this.Invalidate();
			}
		}

		private void File_Save(object sender, System.EventArgs e)
		{
			SaveFileDialog saveFileDialog = new SaveFileDialog();

			saveFileDialog.InitialDirectory = "c:\\" ;
			saveFileDialog.Filter = "Bitmap files (*.bmp)|*.bmp|Jpeg files (*.jpg)|*.jpg|All valid files (*.bmp/*.jpg)|*.bmp/*.jpg" ;
			saveFileDialog.FilterIndex = 1 ;
			saveFileDialog.RestoreDirectory = true ;

			if(DialogResult.OK == saveFileDialog.ShowDialog())
			{
				m_Bitmap.Save(saveFileDialog.FileName);
			}
		}

		private void File_Exit(object sender, System.EventArgs e)
		{
			this.Close();
		}

		private void Filter_Invert(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.Invert(m_Bitmap))
				this.Invalidate();
		}

		private void Filter_GrayScale(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.GrayScale(m_Bitmap))
				this.Invalidate();
		}

		private void Filter_Brightness(object sender, System.EventArgs e)
		{
			Parameter dlg = new Parameter();
			dlg.nValue = 0;

			if (DialogResult.OK == dlg.ShowDialog())
			{
				m_Undo = (Bitmap)m_Bitmap.Clone();
				if(BitmapFilter.Brightness(m_Bitmap, dlg.nValue))
					this.Invalidate();
			}
		}

		private void Filter_Contrast(object sender, System.EventArgs e)
		{
			Parameter dlg = new Parameter();
			dlg.nValue = 0;

			if (DialogResult.OK == dlg.ShowDialog())
			{
				m_Undo = (Bitmap)m_Bitmap.Clone();
				if(BitmapFilter.Contrast(m_Bitmap, (sbyte)dlg.nValue))
					this.Invalidate();
			}
		
		}

		private void Filter_Gamma(object sender, System.EventArgs e)
		{
			GammaInput dlg = new GammaInput();
			dlg.red = dlg.green = dlg.blue = 1;

			if (DialogResult.OK == dlg.ShowDialog())
			{
				m_Undo = (Bitmap)m_Bitmap.Clone();
				if(BitmapFilter.Gamma(m_Bitmap, dlg.red, dlg.green, dlg.blue))
					this.Invalidate();
			}
		}

		private void Filter_Color(object sender, System.EventArgs e)
		{
			ColorInput dlg = new ColorInput();
			dlg.red = dlg.green = dlg.blue = 0;

			if (DialogResult.OK == dlg.ShowDialog())
			{
				m_Undo = (Bitmap)m_Bitmap.Clone();
				if(BitmapFilter.Color(m_Bitmap, dlg.red, dlg.green, dlg.blue))
					this.Invalidate();
			}
		
		}

		private void OnZoom25(object sender, System.EventArgs e)
		{
			Zoom = .25;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnZoom50(object sender, System.EventArgs e)
		{
			Zoom = .5;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnZoom100(object sender, System.EventArgs e)
		{
			Zoom = 1.0;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnZoom150(object sender, System.EventArgs e)
		{
			Zoom = 1.5;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnZoom200(object sender, System.EventArgs e)
		{
			Zoom = 2.0;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnZoom300(object sender, System.EventArgs e)
		{
			Zoom = 3.0;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnZoom500(object sender, System.EventArgs e)
		{
			Zoom = 5;
			this.AutoScrollMinSize = new Size ((int)(m_Bitmap.Width * Zoom), (int)(m_Bitmap.Height * Zoom));
			this.Invalidate();
		}

		private void OnFilterSmooth(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.Smooth(m_Bitmap, 1))
				this.Invalidate();
		}

		private void OnGaussianBlur(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.GaussianBlur(m_Bitmap, 4))
				this.Invalidate();
		}

		private void OnMeanRemoval(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.MeanRemoval(m_Bitmap, 9))
				this.Invalidate();
		}

		private void OnSharpen(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.Sharpen(m_Bitmap, 11))
				this.Invalidate();
		}

		private void OnEmbossLaplacian(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.EmbossLaplacian(m_Bitmap))
				this.Invalidate();
		}

		private void OnEdgeDetectQuick(object sender, System.EventArgs e)
		{
			m_Undo = (Bitmap)m_Bitmap.Clone();
			if(BitmapFilter.EdgeDetectQuick(m_Bitmap))
				this.Invalidate();
		}

		private void OnUndo(object sender, System.EventArgs e)
		{
			Bitmap temp = (Bitmap)m_Bitmap.Clone();
			m_Bitmap = (Bitmap)m_Undo.Clone();
			m_Undo = (Bitmap)temp.Clone();
			this.Invalidate();
		}

		private void OnFilterCustom(object sender, System.EventArgs e)
		{
			Convolution dlg = new Convolution();

			if (DialogResult.OK == dlg.ShowDialog())
			{
				m_Undo = (Bitmap)m_Bitmap.Clone();
				if(BitmapFilter.Conv3x3(m_Bitmap, dlg.Matrix))
					this.Invalidate();
			}
		
		}

	}
}

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About the Author

Christian Graus
Software Developer (Senior)
Australia Australia
Programming computers ( self taught ) since about 1984 when I bought my first Apple ][. Was working on a GUI library to interface Win32 to Python, and writing graphics filters in my spare time, and then building n-tiered apps using asp, atl and asp.net in my job at Dytech. After 4 years there, I've started working from home, at first for Code Project and now for a vet telemedicine company. I owned part of a company that sells client education software in the vet market, but we sold that and I worked for the owners for five years before leaving to get away from the travel, and spend more time with my family. I now work for a company here in Hobart, doing all sorts of Microsoft based stuff in C++ and C#, with a lot of T-SQL in the mix.

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