实例介绍
【实例简介】数字图像几何变换
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace geometry_operations
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void open_Click(object sender, EventArgs e)
{
OpenFileDialog opnDlg = new OpenFileDialog();
opnDlg.Filter = "所有图像文件 | *.bmp; *.pcx; *.png; *.jpg; *.gif;"
"*.tif; *.ico; *.dxf; *.cgm; *.cdr; *.wmf; *.eps; *.emf|"
"位图( *.bmp; *.jpg; *.png;...) | *.bmp; *.pcx; *.png; *.jpg; *.gif; *.tif; *.ico|"
"矢量图( *.wmf; *.eps; *.emf;...) | *.dxf; *.cgm; *.cdr; *.wmf; *.eps; *.emf";
opnDlg.Title = "打开图像文件";
opnDlg.ShowHelp = true;
if (opnDlg.ShowDialog() == DialogResult.OK)
{
curFileName = opnDlg.FileName;
try
{
curBitmap = (Bitmap)Image.FromFile(curFileName);
}
catch (Exception exp)
{
MessageBox.Show(exp.Message);
}
}
Invalidate();
}
private void close_Click(object sender, EventArgs e)
{
this.Close();
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
if (curBitmap != null)
{
g.DrawImage(curBitmap, 160, 20, curBitmap.Width, curBitmap.Height);
}
}
private void translation_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
translation traForm = new translation();
if (traForm.ShowDialog() == DialogResult.OK)
{
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width * curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
int x = Convert.ToInt32(traForm.GetXOffset);
int y = Convert.ToInt32(traForm.GetYOffset);
byte[] tempArray = new byte[bytes];
//Array.Clear(tempArray, 0, bytes);
for (int i = 0; i < bytes; i )
{
tempArray[i] = 255;
}
for (int i = 0; i < curBitmap.Height; i )
{
if ((i y) < curBitmap.Height && (i y) > 0)
{
for (int j = 0; j < curBitmap.Width; j )
{
if ((j x) < curBitmap.Width && (j x) > 0)
{
tempArray[(j x) (i y) * curBitmap.Width] = grayValues[j i * curBitmap.Width];
}
}
}
}
grayValues = (byte[])tempArray.Clone();
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
curBitmap.UnlockBits(bmpData);
}
Invalidate();
}
}
private void mirror_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
mirror mirForm = new mirror();
if (mirForm.ShowDialog() == DialogResult.OK)
{
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width * curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
int halfWidth = curBitmap.Width / 2;
int halfHeight = curBitmap.Height / 2;
byte temp;
if (mirForm.GetMirror)
{
for (int i = 0; i < curBitmap.Height; i )
{
for (int j = 0; j < halfWidth; j )
{
temp = grayValues[i * curBitmap.Width j];
grayValues[i * curBitmap.Width j] = grayValues[(i 1) * curBitmap.Width - 1 - j];
grayValues[(i 1) * curBitmap.Width - 1 - j] = temp;
}
}
}
else
{
for (int i = 0; i < curBitmap.Width; i )
{
for (int j = 0; j < halfHeight; j )
{
temp = grayValues[j * curBitmap.Width i];
grayValues[j * curBitmap.Height i] = grayValues[(curBitmap.Height - j - 1) * curBitmap.Width i];
grayValues[(curBitmap.Height - j - 1) * curBitmap.Width i] = temp;
}
}
}
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
curBitmap.UnlockBits(bmpData);
}
Invalidate();
}
}
private void zoom_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
zoom zoomForm = new zoom();
if (zoomForm.ShowDialog() == DialogResult.OK)
{
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width * curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
double x = Convert.ToDouble(zoomForm.GetXZoom);
double y = Convert.ToDouble(zoomForm.GetYZoom);
int halfWidth = (int)(curBitmap.Width / 2);
int halfHeight = (int)(curBitmap.Height / 2);
int xz = 0;
int yz = 0;
int tempWidth = 0;
int tempHeight = 0;
byte[] tempArray = new byte[bytes];
if (zoomForm.GetNearOrBil == true)
{
for (int i = 0; i < curBitmap.Height; i )
{
for (int j = 0; j < curBitmap.Width; j )
{
tempHeight = i - halfHeight;
tempWidth = j - halfWidth;
if (tempWidth > 0)
{
xz = (int)(tempWidth / x 0.5);
}
else
{
xz = (int)(tempWidth / x - 0.5);
}
if (tempHeight > 0)
{
yz = (int)(tempHeight / y 0.5);
}
else
{
yz = (int)(tempHeight / y - 0.5);
}
tempWidth = xz halfWidth;
tempHeight = yz halfHeight;
if (tempWidth < 0 || tempWidth >= curBitmap.Width || tempHeight < 0 || tempHeight >= curBitmap.Height)
{
tempArray[i * curBitmap.Width j] = 255;
}
else
{
tempArray[i * curBitmap.Width j] = grayValues[tempHeight * curBitmap.Width tempWidth];
}
}
}
}
else
{
double tempX, tempY, p, q;
for (int i = 0; i < curBitmap.Height; i )
{
for (int j = 0; j < curBitmap.Width; j )
{
tempHeight = i - halfHeight;
tempWidth = j - halfWidth;
tempX = tempWidth / x;
tempY = tempHeight / y;
if (tempWidth > 0)
{
xz = (int)tempX;
}
else
{
xz = (int)(tempX - 1);
}
if (tempHeight > 0)
{
yz = (int)tempY;
}
else
{
yz = (int)(tempY - 1);
}
p = tempX - xz;
q = tempY - yz;
tempWidth = xz halfWidth;
tempHeight = yz halfHeight;
if (tempWidth < 0 || (tempWidth 1) >= curBitmap.Width || tempHeight < 0 || (tempHeight 1) >= curBitmap.Height)
{
tempArray[i * curBitmap.Width j] = 255;
}
else
{
tempArray[i * curBitmap.Width j] = (byte)((1.0 - q) * ((1.0 - p) * grayValues[tempHeight * curBitmap.Width tempWidth] p * grayValues[tempHeight * curBitmap.Width tempWidth 1])
q * ((1.0 - p) * grayValues[(tempHeight 1) * curBitmap.Width tempWidth] p * grayValues[(tempHeight 1) * curBitmap.Width 1 tempWidth]));
}
}
}
}
grayValues = (byte[])tempArray.Clone();
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
curBitmap.UnlockBits(bmpData);
}
Invalidate();
}
}
private void rotation_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
rotation rotForm = new rotation();
if (rotForm.ShowDialog() == DialogResult.OK)
{
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width * curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
int degree = Convert.ToInt32(rotForm.GetDegree);
double radian = degree * Math.PI / 180.0;
double mySin = Math.Sin(radian);
double myCos = Math.Cos(radian);
int halfWidth = (int)(curBitmap.Width / 2);
int halfHeight = (int)(curBitmap.Height / 2);
int xr = 0;
int yr = 0;
int tempWidth = 0;
int tempHeight = 0;
byte[] tempArray = new byte[bytes];
double tempX, tempY, p, q;
for (int i = 0; i < curBitmap.Height; i )
{
for (int j = 0; j < curBitmap.Width; j )
{
tempHeight = i - halfHeight;
tempWidth = j - halfWidth;
tempX = tempWidth * myCos - tempHeight * mySin;
tempY = tempHeight * myCos tempWidth * mySin;
if (tempWidth > 0)
{
xr = (int)tempX;
}
else
{
xr = (int)(tempX - 1);
}
if (tempHeight > 0)
{
yr = (int)tempY;
}
else
{
yr = (int)(tempY - 1);
}
p = tempX - xr;
q = tempY - yr;
tempWidth = xr halfWidth;
tempHeight = yr halfHeight;
if (tempWidth < 0 || (tempWidth 1) >= curBitmap.Width || tempHeight < 0 || (tempHeight 1) >= curBitmap.Height)
{
tempArray[i * curBitmap.Width j] = 255;
}
else
{
tempArray[i * curBitmap.Width j] = (byte)((1.0 - q) * ((1.0 - p) * grayValues[tempHeight * curBitmap.Width tempWidth] p * grayValues[tempHeight * curBitmap.Width tempWidth 1])
q * ((1.0 - p) * grayValues[(tempHeight 1) * curBitmap.Width tempWidth] p * grayValues[(tempHeight 1) * curBitmap.Width 1 tempWidth]));
}
}
}
grayValues = (byte[])tempArray.Clone();
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
curBitmap.UnlockBits(bmpData);
}
Invalidate();
}
}
}
}
标签： C#
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