public static void Gauss(BMPImage image)
{
float[,] kernel = new float[, ] {
{ 1f / 16f, 1f / 8f, 1f / 16f }, { 1f / 8f, 1f / 4f, 1f / 8f }, { 1f / 16f, 1f / 8f, 1f / 16f }
};
UseMatrix(image, kernel);
}
public static void SobelX(BMPImage image)
{
GrayFilter.Gray(image);
float[,] kernel = new float[, ] {
{ -1f, 0f, 1f }, { -2f, 0f, 2f }, { -1f, 0f, 1 }
};
UseMatrix(image, kernel);
}
public static void Gray(BMPImage image)
{
for (int x = 0; x < image.Width; x++)
{
for (int y = 0; y < image.Height; y++)
{
Pixel pixel = image.GetPixel(x, y);
int sum = pixel.Red + pixel.Green + pixel.Blue;
pixel.Red = pixel.Green = pixel.Blue = (byte)(sum / 3);
image.SetPixel(pixel, x, y);
}
}
}
public static void Main(string[] args)
{
Console.WriteLine("This program applies one of the filters to the image.");
Console.WriteLine("List of available filters: Gray, Median, Gauss, SobelX, SobelY.\n");
if (args.Length != 3)
{
Console.WriteLine("Incorrect number of arguments.");
return;
}
BMPImage image = new BMPImage(args[0]);
switch (args[1].ToLower())
{
case "gray":
GrayFilter.Gray(image);
break;
case "median":
MedianFilter.Median(image);
break;
case "gauss":
KernelFilters.Gauss(image);
break;
case "sobelx":
KernelFilters.SobelX(image);
break;
case "sobely":
KernelFilters.SobelY(image);
break;
default:
Console.WriteLine("Unknown filter selected. Available names: Gray, Median, Gauss, SobelX, SobelY.");
return;
}
image.WriteToFile(args[2]);
Console.WriteLine("The filter has been appled.");
}
public static void UseMatrix(BMPImage image, float[,] kernel)
{
float red;
float green;
float blue;
Pixel[,] copy = new Pixel[image.Width, image.Height];
for (int x = 1; x < image.Width - 1; x++)
{
for (int y = 1; y < image.Height - 1; y++)
{
red = 0;
green = 0;
blue = 0;
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
red += image.GetPixel(x + i - 1, y + j - 1).Red *kernel[i, j];
green += image.GetPixel(x + i - 1, y + j - 1).Green *kernel[i, j];
blue += image.GetPixel(x + i - 1, y + j - 1).Blue *kernel[i, j];
}
}
red = Math.Abs(red);
green = Math.Abs(green);
blue = Math.Abs(blue);
copy[x, y] = new Pixel((byte)red, (byte)green, (byte)blue);
}
}
for (int x = 1; x < image.Width - 1; x++)
{
for (int y = 1; y < image.Height - 1; y++)
{
image.SetPixel(copy[x, y], x, y);
}
}
}
public static void Median(BMPImage image)
{
byte[] red = new byte[9];
byte[] green = new byte[9];
byte[] blue = new byte[9];
Pixel[,] copy = new Pixel[image.Width, image.Height];
for (int x = 1; x < image.Width - 1; x++)
{
for (int y = 1; y < image.Height - 1; y++)
{
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
red[3 * i + j] = image.GetPixel(x + i - 1, y + j - 1).Red;
green[3 * i + j] = image.GetPixel(x + i - 1, y + j - 1).Green;
blue[3 * i + j] = image.GetPixel(x + i - 1, y + j - 1).Blue;
}
}
Array.Sort(red);
Array.Sort(green);
Array.Sort(blue);
copy[x, y] = new Pixel(red[4], green[4], blue[4]);
}
}
for (int x = 1; x < image.Width - 1; x++)
{
for (int y = 1; y < image.Height - 1; y++)
{
image.SetPixel(copy[x, y], x, y);
}
}
}