public Color[,] LinearFilter(Color[,] input, double[,] Mask, int originX, int originY, string Postprocessing)
{
int width = input.GetLength(0);
int height = input.GetLength(1);
int mask_width = Mask.GetLength(0);
int mask_height = Mask.GetLength(1);
Color[,] temp = Padding(input, Mask, originX, originY);
Color[,] result = new Color[width, height];
Data[,] data = new Data[width, height];
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
Data sum;
sum.R_Val = sum.G_Val = sum.B_Val = 0;
for (int k = 0; k < mask_height; k++)
{
for (int m = 0; m < mask_width; m++)
{
sum.R_Val += Mask[m, k] * temp[i + m, j + k].R;
sum.G_Val += Mask[m, k] * temp[i + m, j + k].G;
sum.B_Val += Mask[m, k] * temp[i + m, j + k].B;
}
}
if (Postprocessing == "Cutoff")
{
sum.R_Val = pixel.cutOff(sum.R_Val);
sum.G_Val = pixel.cutOff(sum.G_Val);
sum.B_Val = pixel.cutOff(sum.B_Val);
result[i, j] = Color.FromArgb((int)sum.R_Val, (int)sum.G_Val, (int)sum.B_Val);
}
else if (Postprocessing == "Absolute")
{
sum.R_Val = Math.Abs(sum.R_Val);
sum.G_Val = Math.Abs(sum.G_Val);
sum.B_Val = Math.Abs(sum.B_Val);
data[i, j] = sum;
}
else if (Postprocessing == "None")
{
result[i, j] = Color.FromArgb((int)sum.R_Val, (int)sum.G_Val, (int)sum.B_Val);
}
}
}
if (Postprocessing == "Absolute")
{
result = pixel.Contrast(0, 255, data);
}
return result;
}
private void Min_Max_Value(Data[,] Org_Buffer, out Data Min, out Data Max)
{
int width = Org_Buffer.GetLength(0);
int height = Org_Buffer.GetLength(1);
Min.B_Val = Min.R_Val = Min.G_Val = 255;
Max.B_Val = Max.R_Val = Max.G_Val = 0;
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
if (Org_Buffer[i, j].R_Val < Min.R_Val)
Min.R_Val = Org_Buffer[i, j].R_Val;
if (Org_Buffer[i, j].G_Val < Min.G_Val)
Min.G_Val = Org_Buffer[i, j].G_Val;
if (Org_Buffer[i, j].B_Val < Min.B_Val)
Min.B_Val = Org_Buffer[i, j].B_Val;
// // // // // //
if (Org_Buffer[i, j].R_Val > Max.R_Val)
Max.R_Val = Org_Buffer[i, j].R_Val;
if (Org_Buffer[i, j].G_Val > Max.G_Val)
Max.G_Val = Org_Buffer[i, j].G_Val;
if (Org_Buffer[i, j].B_Val > Max.B_Val)
Max.B_Val = Org_Buffer[i, j].B_Val;
}
}
}
private Data[] Hist_Normalize(Data[] Hist_Data)
{
Data maxRGB = get_max_value(Hist_Data);
Data[] Norm_Hist_Data = new Data[256];
for (int i = 0; i < 256; ++i)
{
Norm_Hist_Data[i].R_Val = ((Hist_Data[i].R_Val / maxRGB.R_Val) * 256);
Norm_Hist_Data[i].G_Val = ((Hist_Data[i].G_Val / maxRGB.G_Val) * 256);
Norm_Hist_Data[i].B_Val = ((Hist_Data[i].B_Val / maxRGB.B_Val) * 256);
}
return Norm_Hist_Data;
}
private Data[] Histogram_data(int width, int height, Color[,] Org_Buffer)
{
Data[] Hist_Data = new Data[256];
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
++Hist_Data[Org_Buffer[i, j].R].R_Val;
++Hist_Data[Org_Buffer[i, j].G].B_Val;
++Hist_Data[Org_Buffer[i, j].B].G_Val;
}
}
Data[] Norm_Hist_Data = Hist_Normalize(Hist_Data);
return Norm_Hist_Data;
}
private Data get_max_value(Data[] Hist_Data)
{
Data maxRGB = new Data();
for (int i = 0; i < 256; ++i)
{
if (Hist_Data[i].R_Val > maxRGB.R_Val)
maxRGB.R_Val = Hist_Data[i].R_Val;
if (Hist_Data[i].G_Val > maxRGB.G_Val)
maxRGB.G_Val = Hist_Data[i].G_Val;
if (Hist_Data[i].B_Val > maxRGB.B_Val)
maxRGB.B_Val = Hist_Data[i].B_Val;
}
return maxRGB;
}
public Color[,] Gamma(Color[,] Org_Buffer, double Gamma_value)
{
int width = Org_Buffer.GetLength(0);
int height = Org_Buffer.GetLength(1);
Color[,] Org_Buffer_temp = new Color[width, height];
Data[,] RGB = new Data[width, height];
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
RGB[i, j].R_Val = Math.Pow(Org_Buffer[i, j].R, Gamma_value);
RGB[i, j].G_Val = Math.Pow(Org_Buffer[i, j].G, Gamma_value);
RGB[i, j].B_Val = Math.Pow(Org_Buffer[i, j].B, Gamma_value);
}
}
Org_Buffer_temp = Contrast(0, 255, RGB);
return Org_Buffer_temp;
}
//Normalization int Data type [overloaded Function]
public Color[,] Contrast(int NewMin, int NewMax, Data[,] Org_Buffer)
{
//NewVal = [(OldVal – OldMin)/(OldMax – OldMin)] × (NewMax – NewMin) + NewMin
Data OldMin, OldMax;
Min_Max_Value(Org_Buffer, out OldMin, out OldMax);
int width = Org_Buffer.GetLength(0);
int height = Org_Buffer.GetLength(1);
Color[,] Org_Buffer_temp = new Color[width, height];
Data data;
//IMPORTANT ==> we Suppose that NewMax & NewMin is one for R & G & B .. the user Enter one value fo 3 colors
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
data.R_Val = (((Org_Buffer[i, j].R_Val - OldMin.R_Val) / (OldMax.R_Val - OldMin.R_Val)) * (NewMax - NewMin) + NewMin);
data.R_Val = cutOff(data.R_Val);
data.G_Val = (((Org_Buffer[i, j].G_Val - OldMin.G_Val) / (OldMax.G_Val - OldMin.G_Val)) * (NewMax - NewMin) + NewMin);
data.G_Val = cutOff(data.G_Val);
data.B_Val = (((Org_Buffer[i, j].B_Val - OldMin.B_Val) / (OldMax.B_Val - OldMin.B_Val)) * (NewMax - NewMin) + NewMin);
data.B_Val = cutOff(data.B_Val);
Org_Buffer_temp[i, j] = Color.FromArgb((int)data.R_Val, (int)data.G_Val, (int)data.B_Val);
}
}
return Org_Buffer_temp;
}
