?? filters.cs
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using System;
using System.Drawing;
using System.Drawing.Imaging;
namespace CSharpFilters
{
public class ConvMatrix
{
public int TopLeft = 0, TopMid = 0, TopRight = 0;
public int MidLeft = 0, Pixel = 1, MidRight = 0;
public int BottomLeft = 0, BottomMid = 0, BottomRight = 0;
public int Factor = 1;
public int Offset = 0;
public void SetAll(int nVal)
{
TopLeft = TopMid = TopRight = MidLeft = Pixel = MidRight = BottomLeft = BottomMid = BottomRight = nVal;
}
}
public class BitmapFilter
{
public static bool Invert(Bitmap b)
{
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - b.Width*3;
int nWidth = b.Width * 3;
for(int y=0;y<b.Height;++y)
{
for(int x=0; x < nWidth; ++x )
{
p[0] = (byte)(255-p[0]);
++p;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return true;
}
public static bool GrayScale(Bitmap b)
{
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - b.Width*3;
byte red, green, blue;
for(int y=0;y<b.Height;++y)
{
for(int x=0; x < b.Width; ++x )
{
blue = p[0];
green = p[1];
red = p[2];
p[0] = p[1] = p[2] = (byte)(.299 * red + .587 * green + .114 * blue);
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return true;
}
public static bool Brightness(Bitmap b, int nBrightness)
{
if (nBrightness < -255 || nBrightness > 255)
return false;
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
int nVal = 0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - b.Width*3;
int nWidth = b.Width * 3;
for(int y=0;y<b.Height;++y)
{
for(int x=0; x < nWidth; ++x )
{
nVal = (int) (p[0] + nBrightness);
if (nVal < 0) nVal = 0;
if (nVal > 255) nVal = 255;
p[0] = (byte)nVal;
++p;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return true;
}
public static bool Contrast(Bitmap b, sbyte nContrast)
{
if (nContrast < -100) return false;
if (nContrast > 100) return false;
double pixel = 0, contrast = (100.0+nContrast)/100.0;
contrast *= contrast;
int red, green, blue;
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - b.Width*3;
for(int y=0;y<b.Height;++y)
{
for(int x=0; x < b.Width; ++x )
{
blue = p[0];
green = p[1];
red = p[2];
pixel = red/255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[2] = (byte) pixel;
pixel = green/255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[1] = (byte) pixel;
pixel = blue/255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[0] = (byte) pixel;
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return true;
}
public static bool Gamma(Bitmap b, double red, double green, double blue)
{
if (red < .2 || red > 5) return false;
if (green < .2 || green > 5) return false;
if (blue < .2 || blue > 5) return false;
byte [] redGamma = new byte [256];
byte [] greenGamma = new byte [256];
byte [] blueGamma = new byte [256];
for (int i = 0; i< 256; ++i)
{
redGamma[i] = (byte)Math.Min(255, (int)(( 255.0 * Math.Pow(i/255.0, 1.0/red)) + 0.5));
greenGamma[i] = (byte)Math.Min(255, (int)(( 255.0 * Math.Pow(i/255.0, 1.0/green)) + 0.5));
blueGamma[i] = (byte)Math.Min(255, (int)(( 255.0 * Math.Pow(i/255.0, 1.0/blue)) + 0.5));
}
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - b.Width*3;
for(int y=0;y<b.Height;++y)
{
for(int x=0; x < b.Width; ++x )
{
p[2] = redGamma[ p[2] ];
p[1] = greenGamma[ p[1] ];
p[0] = blueGamma[ p[0] ];
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return true;
}
public static bool Color(Bitmap b, int red, int green, int blue)
{
if (red < -255 || red > 255) return false;
if (green < -255 || green > 255) return false;
if (blue < -255 || blue > 255) return false;
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - b.Width*3;
int nPixel;
for(int y=0;y<b.Height;++y)
{
for(int x=0; x < b.Width; ++x )
{
nPixel = p[2] + red;
nPixel = Math.Max(nPixel, 0);
p[2] = (byte)Math.Min(255, nPixel);
nPixel = p[1] + green;
nPixel = Math.Max(nPixel, 0);
p[1] = (byte)Math.Min(255, nPixel);
nPixel = p[0] + blue;
nPixel = Math.Max(nPixel, 0);
p[0] = (byte)Math.Min(255, nPixel);
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return true;
}
public static bool Conv3x3(Bitmap b, ConvMatrix m)
{
// Avoid divide by zero errors
if (0 == m.Factor) return false;
Bitmap bSrc = (Bitmap)b.Clone();
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
BitmapData bmSrc = bSrc.LockBits(new Rectangle(0, 0, bSrc.Width, bSrc.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
int stride2 = stride * 2;
System.IntPtr Scan0 = bmData.Scan0;
System.IntPtr SrcScan0 = bmSrc.Scan0;
unsafe
{
byte * p = (byte *)(void *)Scan0;
byte * pSrc = (byte *)(void *)SrcScan0;
int nOffset = stride - b.Width*3;
int nWidth = b.Width - 2;
int nHeight = b.Height - 2;
int nPixel;
for(int y=0;y < nHeight;++y)
{
for(int x=0; x < nWidth; ++x )
{
nPixel = ( ( ( (pSrc[2] * m.TopLeft) + (pSrc[5] * m.TopMid) + (pSrc[8] * m.TopRight) +
(pSrc[2 + stride] * m.MidLeft) + (pSrc[5 + stride] * m.Pixel) + (pSrc[8 + stride] * m.MidRight) +
(pSrc[2 + stride2] * m.BottomLeft) + (pSrc[5 + stride2] * m.BottomMid) + (pSrc[8 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);
if (nPixel < 0) nPixel = 0;
if (nPixel > 255) nPixel = 255;
p[5 + stride]= (byte)nPixel;
nPixel = ( ( ( (pSrc[1] * m.TopLeft) + (pSrc[4] * m.TopMid) + (pSrc[7] * m.TopRight) +
(pSrc[1 + stride] * m.MidLeft) + (pSrc[4 + stride] * m.Pixel) + (pSrc[7 + stride] * m.MidRight) +
(pSrc[1 + stride2] * m.BottomLeft) + (pSrc[4 + stride2] * m.BottomMid) + (pSrc[7 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);
if (nPixel < 0) nPixel = 0;
if (nPixel > 255) nPixel = 255;
p[4 + stride] = (byte)nPixel;
nPixel = ( ( ( (pSrc[0] * m.TopLeft) + (pSrc[3] * m.TopMid) + (pSrc[6] * m.TopRight) +
(pSrc[0 + stride] * m.MidLeft) + (pSrc[3 + stride] * m.Pixel) + (pSrc[6 + stride] * m.MidRight) +
(pSrc[0 + stride2] * m.BottomLeft) + (pSrc[3 + stride2] * m.BottomMid) + (pSrc[6 + stride2] * m.BottomRight)) / m.Factor) + m.Offset);
if (nPixel < 0) nPixel = 0;
if (nPixel > 255) nPixel = 255;
p[3 + stride] = (byte)nPixel;
p += 3;
pSrc += 3;
}
p += nOffset;
pSrc += nOffset;
}
}
b.UnlockBits(bmData);
bSrc.UnlockBits(bmSrc);
return true;
}
public static bool Smooth(Bitmap b, int nWeight /* default to 1 */)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(1);
m.Pixel = nWeight;
m.Factor = nWeight + 8;
return BitmapFilter.Conv3x3(b, m);
}
public static bool GaussianBlur(Bitmap b, int nWeight /* default to 4*/)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(1);
m.Pixel = nWeight;
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 2;
m.Factor = nWeight + 12;
return BitmapFilter.Conv3x3(b, m);
}
public static bool MeanRemoval(Bitmap b, int nWeight /* default to 9*/ )
{
ConvMatrix m = new ConvMatrix();
m.SetAll(-1);
m.Pixel = nWeight;
m.Factor = nWeight - 8;
return BitmapFilter.Conv3x3(b, m);
}
public static bool Sharpen(Bitmap b, int nWeight /* default to 11*/ )
{
ConvMatrix m = new ConvMatrix();
m.SetAll(0);
m.Pixel = nWeight;
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = -2;
m.Factor = nWeight - 8;
return BitmapFilter.Conv3x3(b, m);
}
public static bool EmbossLaplacian(Bitmap b)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(-1);
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 0;
m.Pixel = 4;
m.Offset = 127;
return BitmapFilter.Conv3x3(b, m);
}
public static bool EdgeDetectQuick(Bitmap b)
{
ConvMatrix m = new ConvMatrix();
m.TopLeft = m.TopMid = m.TopRight = -1;
m.MidLeft = m.Pixel = m.MidRight = 0;
m.BottomLeft = m.BottomMid = m.BottomRight = 1;
m.Offset = 127;
return BitmapFilter.Conv3x3(b, m);
}
}
}
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