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Unsharp Mask C#.NET

This is a discussion on Unsharp Mask C#.NET within the C# Programming forums, part of the Software Development category; private unsafe Bitmap UnsharpMask(Bitmap img, double amount, int radius, int threshold) { if (amount > 500) amount = 500; amount = amount * ...


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  #1 (permalink)  
Old 01-25-2008, 03:28 AM
kingmaker kingmaker is offline
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Default Unsharp Mask C#.NET
private unsafe Bitmap UnsharpMask(Bitmap img, double amount, int radius, int threshold)
{

if (amount > 500) amount = 500;
amount = amount * 2;
if (radius > 50) radius = 50;
radius = radius * 2;
if (threshold > 255) threshold = 255;

if (radius == 0)
{
img.Dispose();
return img;
}
int w = img.Width; int h = img.Height;
Bitmap imgCanvas = new Bitmap(w, h);
Bitmap imgBlur = new Bitmap(w, h);

for (int i = 0; i < radius; i++)
{

ConvMatrix con = new ConvMatrix();
imgBlur = (Bitmap)img.Clone();
BitmapFilter.Conv3x3(imgBlur, con);
}

BitmapData imgdata1 = img.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
BitmapData imgdata2 = imgBlur.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

byte* p1 = (byte*)(void*)imgdata1.Scan0;

byte* p2 = (byte*)(void*)imgdata2.Scan0;

if (threshold > 0)
{


for (int x = 0; x < w - 1; x++)
{
for (int y = 0; y < h; y++)
{

int imgRValue = p1[2];
int imgGValue = p1[1];
int imgBValue = p1[0];

int imgBlurRValue = p2[2];
int imgBlurGValue = p2[1];
int imgBlurBValue = p2[0];


int rNew = (Math.Abs(imgRValue - imgBlurRValue) >= (int)threshold)
? Math.Max(0, Math.Min(255, ((int)amount * (imgRValue - imgBlurRValue)) + imgRValue)) : imgRValue;
int gNew = (Math.Abs(imgGValue - imgBlurGValue) >= (int)threshold)
? Math.Max(0, Math.Min(255, ((int)amount * (imgGValue - imgBlurGValue)) + imgGValue)) : imgGValue;
int bNew = (Math.Abs(imgBValue - imgBlurBValue) >= (int)threshold)
? Math.Max(0, Math.Min(255, ((int)amount * (imgBValue - imgBlurBValue)) + imgBValue)) : imgBValue;

if ((imgRValue != rNew) || (imgGValue != gNew) || (imgBValue != bNew))
{
p1[0] = (byte)bNew;
p1[1] = (byte)gNew;
p1[2] = (byte)rNew;

}
p1 = p1 + 3;
p2 = p2 + 3;


}

}

}
else
{
for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
System.Drawing.Color rgb = img.GetPixel(x, y);
int imgRValue = Convert.ToInt32(rgb.R);
int imgGValue = Convert.ToInt32(rgb.G);
int imgBValue = Convert.ToInt32(rgb.B);

System.Drawing.Color imgBlurRGB = imgBlur.GetPixel(x, y);
int imgBlurRValue = Convert.ToInt32(imgBlurRGB.R);
int imgBlurGValue = Convert.ToInt32(imgBlurRGB.G);
int imgBlurBValue = Convert.ToInt32(imgBlurRGB.B);

int rNew = ((int)amount * (imgRValue - imgBlurRValue)) + imgRValue;

if (rNew > 255)
rNew = 255;
else if (rNew < 0)
rNew = 0;

int gNew = ((int)amount * (imgGValue - imgBlurGValue)) + imgGValue;

if (gNew > 255)
gNew = 255;
else if (gNew < 0)
gNew = 0;

int bNew = ((int)amount * (imgBValue - imgBlurBValue)) + imgBValue;
if (bNew > 255)
bNew = 255;
else if (bNew < 0)
bNew = 0;

img.SetPixel(x, y, System.Drawing.Color.FromArgb(rNew, gNew, bNew));

}
}

}

img.UnlockBits(imgdata1);
imgBlur.UnlockBits(imgdata2);

return img;
}



this one is not perfect...radius..but its working fine
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  #2 (permalink)  
Old 01-25-2008, 03:54 AM
$enthil $enthil is offline
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Smile Re: Unsharp Mask C#.NET
Can you give me the code for ConvMatrix class and Conv3x3() function?
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  #3 (permalink)  
Old 01-25-2008, 04:15 AM
kingmaker kingmaker is offline
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Default Re: Unsharp Mask C#.NET
I forgot this method...

Quote:
public class ConvMatrix
{
public int TopLeft = 1, TopMid = 2, TopRight = 1;
public int MidLeft = 2, Pixel = 4, MidRight = 2;
public int BottomLeft = 1, BottomMid = 2, BottomRight = 1;
public int Factor = 1;
public int Offset = 0;
public void SetAll(int nVal)
{
TopLeft = TopMid = TopRight = MidLeft = Pixel = MidRight = BottomLeft = BottomMid = BottomRight = nVal;

}

}


Quote:
Quote:
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;
}
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Last edited by kingmaker : 01-25-2008 at 05:05 AM.
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  #4 (permalink)  
Old 01-25-2008, 04:23 AM
it.wily it.wily is offline
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Smile Re: Unsharp Mask C#.NET
Hi kingmaker...

what does the Conv3x3 function do?

and also the class ConvMatrix?
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Old 01-25-2008, 04:31 AM
kingmaker kingmaker is offline
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Default Re: Unsharp Mask C#.NET
Convolution is a mathematical way of combining two signals to form a third signal

Check the attached images...
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