//<sumary>
// x, y : point (x,y)
// size : convolution size
//</sumary>
private Color GetAvg(LockBitmap lbm, int x, int y, int size = 3)
{
if (size % 2 == 0)
{
throw new ArgumentException("Convolution size must is odd number");
}
int sumR = 0, sumG = 0, sumB = 0, sumA = 0;
for (int i = x - size / 2; i <= x + size / 2; i++)
{
for (int j = y - size / 2; j <= y + size / 2; j++)
{
if (i >= 0 && j >= 0 && i < lbm.Width && j < lbm.Height)
{
sumA += (int)lbm.GetPixel(i, j).A;
sumR += (int)lbm.GetPixel(i, j).R;
sumG += (int)lbm.GetPixel(i, j).G;
sumB += (int)lbm.GetPixel(i, j).B;
}
}
}
sumA = (int)(Math.Round((double)sumA / (size * size), MidpointRounding.AwayFromZero));
sumR = (int)(Math.Round((double)sumR / (size * size), MidpointRounding.AwayFromZero));
sumG = (int)(Math.Round((double)sumG / (size * size), MidpointRounding.AwayFromZero));
sumB = (int)(Math.Round((double)sumB / (size * size), MidpointRounding.AwayFromZero));
return(lbm.Depth == 32 ? Color.FromArgb(sumA, sumR, sumG, sumB) : Color.FromArgb(sumR, sumG, sumB));
}
private Color GetMax(LockBitmap lbm, int x, int y, int size = 3)
{
Color color = new Color();
int maxVal = 0, tmp;
if (size % 2 == 0)
{
throw new ArgumentException("Convolution size must is odd number");
}
for (int i = x - size / 2; i <= x + size / 2; i++)
{
for (int j = y - size / 2; j <= y + size / 2; j++)
{
if (i >= 0 && j >= 0 && i < lbm.Width && j < lbm.Height)
{
tmp = lbm.GetPixel(i, j).R + lbm.GetPixel(i, j).G + lbm.GetPixel(i, j).B + lbm.GetPixel(i, j).A;
if (tmp > maxVal)
{
maxVal = tmp;
color = lbm.GetPixel(i, j);
}
}
else
{
}
}
}
return(color);
}
private Color GetSharp(LockBitmap lbm, int x, int y, int size = 3)
{
if (size % 2 == 0)
{
throw new ArgumentException("Convolution size must is odd number");
}
// index of CONV_SHARP matrix
int index = 0;
int R = 0, G = 0, B = 0, A = 0;
for (int i = x - size / 2; i <= x + size / 2; i++)
{
for (int j = y - size / 2; j <= y + size / 2; j++)
{
if (i >= 0 && j >= 0 && i < lbm.Width && j < lbm.Height)
{
if (size == 3)
{
A += (int)lbm.GetPixel(i, j).A *CONV_SHARP_3_3[index];
R += (int)lbm.GetPixel(i, j).R *CONV_SHARP_3_3[index];
G += (int)lbm.GetPixel(i, j).G *CONV_SHARP_3_3[index];
B += (int)lbm.GetPixel(i, j).B *CONV_SHARP_3_3[index];
}
else if (size == 5)
{
A += (int)lbm.GetPixel(i, j).A *CONV_SHARP_5_5[index];
R += (int)lbm.GetPixel(i, j).R *CONV_SHARP_5_5[index];
G += (int)lbm.GetPixel(i, j).G *CONV_SHARP_5_5[index];
B += (int)lbm.GetPixel(i, j).B *CONV_SHARP_5_5[index];
}
else
{
throw new System.ArgumentException("size cannot be" + size, "original");
}
}
index++;
}
}
A = (A < 0 ? 0 : (A > 255 ? 255 : A));
R = (R < 0 ? 0 : (R > 255 ? 255 : R));
G = (G < 0 ? 0 : (G > 255 ? 255 : G));
B = (B < 0 ? 0 : (B > 255 ? 255 : B));
return(lbm.Depth == 32 ? Color.FromArgb(A, R, G, B) : Color.FromArgb(R, G, B));
}
private Color GetMedian(LockBitmap lbm, int x, int y, int size = 3)
{
List <byte> rColor = new List <byte>();
List <byte> gColor = new List <byte>();
List <byte> bColor = new List <byte>();
List <byte> aColor = new List <byte>();
if (size % 2 == 0)
{
throw new ArgumentException("Convolution size must is odd number");
}
for (int i = x - size / 2; i <= x + size / 2; i++)
{
for (int j = y - size / 2; j <= y + size / 2; j++)
{
if (i >= 0 && j >= 0 && i < lbm.Width && j < lbm.Height)
{
rColor.Add(lbm.GetPixel(i, j).R);
gColor.Add(lbm.GetPixel(i, j).G);
bColor.Add(lbm.GetPixel(i, j).B);
aColor.Add(lbm.GetPixel(i, j).A);
}
else
{
rColor.Add(0);
gColor.Add(0);
bColor.Add(0);
aColor.Add(0);
}
}
}
int mid = (size * size - 1) / 2;
rColor.Sort(); gColor.Sort(); bColor.Sort(); aColor.Sort();
return(lbm.Depth == 32 ? Color.FromArgb(aColor[mid], rColor[mid], gColor[mid], bColor[mid]) : Color.FromArgb(rColor[mid], gColor[mid], bColor[mid]));
}
private Bitmap GetResult(Bitmap bmp, int type)
{
imageOutput = new Bitmap(imageInput.Width, imageInput.Height, imageInput.PixelFormat);
LockBitmap lockBitmapIn = new LockBitmap(imageInput);
lockBitmapIn.LockBits();
LockBitmap lockBitmapOut = new LockBitmap(imageOutput);
lockBitmapOut.LockBits();
int width = lockBitmapIn.Width;
int height = lockBitmapIn.Height;
switch (type)
{
case 1:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetAvg(lockBitmapIn, i, j, CONV_SIZE_3_3));
}
}
break;
case 2:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetAvg(lockBitmapIn, i, j, CONV_SIZE_5_5));
}
}
break;
case 3:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetMedian(lockBitmapIn, i, j, CONV_SIZE_3_3));
}
}
break;
case 4:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetMedian(lockBitmapIn, i, j, CONV_SIZE_5_5));
}
}
break;
case 5:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetSharp(lockBitmapIn, i, j, CONV_SIZE_3_3));
}
}
break;
case 6:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetSharp(lockBitmapIn, i, j, CONV_SIZE_5_5));
}
}
break;
case 7:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetMax(lockBitmapIn, i, j, CONV_SIZE_3_3));
}
}
break;
case 8:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetMax(lockBitmapIn, i, j, CONV_SIZE_5_5));
}
}
break;
case 9:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetMin(lockBitmapIn, i, j, CONV_SIZE_3_3));
}
}
break;
case 10:
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
lockBitmapOut.SetPixel(i, j, GetMin(lockBitmapIn, i, j, CONV_SIZE_5_5));
}
}
break;
default:
MessageBox.Show("Hãy chọn một bộ lọc!, pls", "Lỗi", MessageBoxButtons.OK, MessageBoxIcon.Error);
lockBitmapIn.UnlockBits();
lockBitmapOut.UnlockBits();
return(null);
}
lockBitmapIn.UnlockBits();
lockBitmapOut.UnlockBits();
return(imageOutput);
}
