private int DualGradient(int x, int y)
{
Pixel24b yUp = GetPixelY(x, y + 1);
Pixel24b yDown = GetPixelY(x, y - 1);
int yGradient = (yUp.r - yDown.r) * (yUp.r - yDown.r) + (yUp.g - yDown.g) * (yUp.g - yDown.g) + (yUp.b - yDown.b) * (yUp.b - yDown.b);
Pixel24b xLeft = GetPixelX(x - 1, y);
Pixel24b xRight = GetPixelX(x + 1, y);
int xGradient = (xRight.r - xLeft.r) * (xRight.r - xLeft.r) + (xRight.g - xLeft.g) * (xRight.g - xLeft.g) + (xRight.b - xLeft.b) * (xRight.b - xLeft.b);
return(xGradient + yGradient);
}
private void PopulateBitmapMatrix()
{
BitmapData bmData = this.edge.LockBits(new Rectangle(0, 0, this.edge.Width, this.edge.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int size = bmData.Stride * bmData.Height;
int width = this.edge.Width;
int height = this.edge.Height;
byte[] p = new byte[size];
System.Runtime.InteropServices.Marshal.Copy(bmData.Scan0, p, 0, size);
int x = 0;
int y = 0;
for (int i = 0; i < size; i += 3)
{
if (x == width)
{
x = 0;
y++;
if (y == height)
{
break;
}
}
Pixel24b px = new Pixel24b();
px.r = p[i + 2];
px.g = p[i + 1];
px.b = p[i];
this.bitmapMatrix[y, x] = px;
x++;
}
this.edge.UnlockBits(bmData);
}