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Cellane/Convolution.cs

Created November 13, 2012 09:40
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Convolution.cs
using System;
using System.Drawing;
namespace Convolution
{
public class Convolution
{
public Image DoMagic(Bitmap input, ConvolutionKernel kernel)
{
var output = new Bitmap(input.Width, input.Height);
var s = kernel.Size / 2;
for (var x = s; x < input.Width - s; x++)
{
for (var y = s; y < input.Height - s; y++)
{
int r = 0, b = 0, g = 0;
for (var i = 0; i < kernel.Size; i++)
{
for (var j = 0; j < kernel.Size; j++)
{
var temp = input.GetPixel(x + i - s, y + j - s);
r += kernel.Matrix[i, j] * temp.R;
g += kernel.Matrix[i, j] * temp.G;
b += kernel.Matrix[i, j] * temp.B;
}
}
r = Math.Min(Math.Max((r / kernel.Factor) + kernel.Offset, 0), 255);
g = Math.Min(Math.Max((g / kernel.Factor) + kernel.Offset, 0), 255);
b = Math.Min(Math.Max((b / kernel.Factor) + kernel.Offset, 0), 255);
output.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
return output;
}
}
}
Raw
ConvolutionKernel.cs
namespace Convolution
{
public class ConvolutionKernel
{
public int Factor { get; set; }
public int Offset { get; set; }
private int[,] _matrix =
{
{-2, -2, -2, -2, -2},
{-1, -1, -1, -1, -1},
{0, 0, 0, 0, 0},
{1, 1, 1, 1, 1},
{2, 2, 2, 2, 2}
};
public int[,] Matrix
{
get
{
return _matrix;
}
set
{
_matrix = value;
Factor = 0;
for (var i = 0; i < Size; i++)
{
for (var j = 0; j < Size; j++)
{
Factor += _matrix[i, j];
}
}
if (Factor == 0)
{
Factor = 1;
}
}
}
private int _size = 5;
public int Size
{
get
{
return _size;
}
set
{
if (value != 1 && value != 3 && value != 5 && value != 7)
{
_size = 5;
}
else
{
_size = value;
}
}
}
public ConvolutionKernel()
{
Offset = 0;
Factor = 1;
}
}
}
Raw
MainForm.cs
using System;
using System.Drawing;
using System.Windows.Forms;
namespace Convolution
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
private void BtnSmallClick(object sender, EventArgs e)
{
var convolution = new Convolution();
var source = new Bitmap(pbSource.Image);
var kernel = new ConvolutionKernel();
int[,] matrix = {{-1, -1, -1}, {0, 0, 0}, {1, 1, 1}};
kernel.Size = 3;
kernel.Matrix = matrix;
var image = convolution.DoMagic(source, kernel);
pbSmall.Image = image;
Refresh();
}
private void BtnBigClick(object sender, EventArgs e)
{
var convolution = new Convolution();
var source = new Bitmap(pbSource.Image);
var kernel = new ConvolutionKernel();
var image = convolution.DoMagic(source, kernel);
pbBig.Image = image;
Refresh();
}
}
}
Raw
MainForm.Designer.cs
namespace Convolution
{
partial class MainForm
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (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.pbSource = new System.Windows.Forms.PictureBox();
this.pbSmall = new System.Windows.Forms.PictureBox();
this.btnSmall = new System.Windows.Forms.Button();
this.pbBig = new System.Windows.Forms.PictureBox();
this.btnBig = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize)(this.pbSource)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pbSmall)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pbBig)).BeginInit();
this.SuspendLayout();
//
// pbSource
//
this.pbSource.Image = global::Convolution.Properties.Resources.Fluttershy;
this.pbSource.Location = new System.Drawing.Point(12, 12);
this.pbSource.Name = "pbSource";
this.pbSource.Size = new System.Drawing.Size(300, 340);
this.pbSource.TabIndex = 0;
this.pbSource.TabStop = false;
//
// pbSmall
//
this.pbSmall.Location = new System.Drawing.Point(318, 12);
this.pbSmall.Name = "pbSmall";
this.pbSmall.Size = new System.Drawing.Size(300, 340);
this.pbSmall.TabIndex = 1;
this.pbSmall.TabStop = false;
//
// btnSmall
//
this.btnSmall.Location = new System.Drawing.Point(318, 12);
this.btnSmall.Name = "btnSmall";
this.btnSmall.Size = new System.Drawing.Size(75, 23);
this.btnSmall.TabIndex = 2;
this.btnSmall.Text = "3*3";
this.btnSmall.UseVisualStyleBackColor = true;
this.btnSmall.Click += new System.EventHandler(this.BtnSmallClick);
//
// pbBig
//
this.pbBig.Location = new System.Drawing.Point(624, 12);
this.pbBig.Name = "pbBig";
this.pbBig.Size = new System.Drawing.Size(300, 340);
this.pbBig.TabIndex = 3;
this.pbBig.TabStop = false;
//
// btnBig
//
this.btnBig.Location = new System.Drawing.Point(624, 12);
this.btnBig.Name = "btnBig";
this.btnBig.Size = new System.Drawing.Size(75, 23);
this.btnBig.TabIndex = 4;
this.btnBig.Text = "5*5";
this.btnBig.UseVisualStyleBackColor = true;
this.btnBig.Click += new System.EventHandler(this.BtnBigClick);
//
// MainForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(936, 364);
this.Controls.Add(this.btnBig);
this.Controls.Add(this.pbBig);
this.Controls.Add(this.btnSmall);
this.Controls.Add(this.pbSmall);
this.Controls.Add(this.pbSource);
this.Name = "MainForm";
this.Text = "MainForm";
((System.ComponentModel.ISupportInitialize)(this.pbSource)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pbSmall)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pbBig)).EndInit();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.PictureBox pbSource;
private System.Windows.Forms.PictureBox pbSmall;
private System.Windows.Forms.Button btnSmall;
private System.Windows.Forms.PictureBox pbBig;
private System.Windows.Forms.Button btnBig;
}
}
Raw
Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
namespace Convolution
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm());
}
}
}
@bolorundurowb
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bolorundurowb commented Jan 28, 2017

Thanks for this, it is quite the help.

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