public void GreyFilter()
{
int counter = 0;
Pixels = Pixels
.Select(x => x
.GroupBy(y => counter++ / SizesOfImage[2])
.Select(y => y
.Select(z => (byte)(0.3 * y.First() + 0.59 * y.Skip(1).First() + 0.11 * y.Skip(2).First())))
.SelectMany(y => y)
.ToArray())
.ToArray();
}
public void SobelAxisFilter(int flag) // 1 - xAxis, 0 - yAxis
{
GreyFilter();
const int limit = 73;
byte[][] bufferPixels = new byte[SizesOfImage[1]][]
.Select(x => new byte[SizesOfImage[0]])
.ToArray();
int[] sobelFilter = { -1, 2 * (flag - 1), -1 + 2 * flag, -2 * flag, 0, 2 * flag, 1 - 2 * flag, 2 - 2 * flag, 1 }; // {-1, 0, 1, -2, 0, 2, -1, 0, 1} for flag == 1, {-1, -2, -1, 0, 0, 0, 1, 2, 1} for == 0
for (int i = 1; i < SizesOfImage[1] - 1; i++)
{
for (int j = SizesOfImage[2]; j < SizesOfImage[0] - SizesOfImage[2]; j++)
{
int counter = 0;
byte[] buffer = Pixels
.Skip(i - 1)
.Take(3)
.Select(x => x
.Skip(j - SizesOfImage[2])
.Take(3 * SizesOfImage[2]))
.SelectMany(x => x)
.ToArray()
.Where((x, y) => y % 3 == 0)
.ToArray();
bufferPixels[i][j / SizesOfImage[2]] = (byte)(255 * Convert.ToInt32(Math.Abs(buffer.Select(x => x * sobelFilter[counter++ % 9]).Sum()) > limit)); // 255 for > limit and 0 for <=
}
}
int k = 0;
int l = 0;
Pixels = Pixels
.Select(x => x
.Select(y => bufferPixels[k++ / SizesOfImage[0]][(l++ % SizesOfImage[0]) / SizesOfImage[2]])
.ToArray())
.ToArray();
}
