public static Image Generate(Image image)
{
Image skeleton = new Image(image.GetPixels(), image.Size);
DoubleStructure2D L1 = new DoubleStructure2D(
new Structure2D(0, 0, 0,
0, 1, 0,
1, 1, 1),
new Structure2D(1, 1, 1,
0, 0, 0,
0, 0, 0));
DoubleStructure2D L2 = new DoubleStructure2D(
new Structure2D(0, 0, 0,
1, 1, 0,
1, 1, 0),
new Structure2D(0, 1, 0,
0, 0, 1,
0, 0, 0));
DoubleStructure2D L3 = new DoubleStructure2D(
new Structure2D(1, 0, 0,
1, 1, 0,
1, 0, 0),
new Structure2D(0, 0, 1,
0, 0, 1,
0, 0, 1));
DoubleStructure2D L4 = new DoubleStructure2D(
new Structure2D(1, 1, 0,
1, 1, 0,
0, 0, 0),
new Structure2D(0, 0, 0,
0, 0, 1,
0, 1, 0));
DoubleStructure2D L5 = new DoubleStructure2D(
new Structure2D(1, 1, 1,
0, 1, 0,
0, 0, 0),
new Structure2D(0, 0, 0,
0, 0, 0,
1, 1, 1));
DoubleStructure2D L6 = new DoubleStructure2D(
new Structure2D(0, 1, 1,
0, 1, 1,
0, 0, 0),
new Structure2D(0, 0, 0,
1, 0, 0,
0, 1, 0));
DoubleStructure2D L7 = new DoubleStructure2D(
new Structure2D(0, 0, 1,
0, 1, 1,
0, 0, 1),
new Structure2D(1, 0, 0,
1, 0, 0,
1, 0, 0));
DoubleStructure2D L8 = new DoubleStructure2D(
new Structure2D(0, 0, 0,
0, 1, 1,
0, 1, 1),
new Structure2D(0, 1, 0,
1, 0, 0,
0, 0, 0));
int[,] currentImage;
while (true)
{
currentImage = (int[,])skeleton.GetPixels().Clone();
ApplyDoubleStructure(skeleton, L1);
ApplyDoubleStructure(skeleton, L2);
ApplyDoubleStructure(skeleton, L3);
ApplyDoubleStructure(skeleton, L4);
ApplyDoubleStructure(skeleton, L5);
ApplyDoubleStructure(skeleton, L6);
ApplyDoubleStructure(skeleton, L7);
ApplyDoubleStructure(skeleton, L8);
if (Toolbox.EqualPixels(currentImage, skeleton.GetPixels(), skeleton.Size)) break;
}
return skeleton;
}
/// <summary>
/// Apply the double structure. (Thinning)
/// </summary>
/// <param name="image"></param>
/// <param name="structure"></param>
private static void ApplyDoubleStructure(Image image, DoubleStructure2D structure)
{
int[,] currentPixels = image.GetPixels();
int[,] newPixels = new int[image.Size.Width, image.Size.Height];
//structure information
int structureWidth = structure.StructureSize.Width;
int structureHeight = structure.StructureSize.Height;
int middelPixelIndexWidth = structureWidth / 2;
int middelPixelIndexHeight = structureHeight / 2;
//Loop through the image
for (int x = 0; x < image.Size.Width; x++)
{
for (int y = 0; y < image.Size.Height; y++)
{
//Determin structure's position, based on current pixel
int structureStartPositionX = x - middelPixelIndexWidth;
int structureStartPositionY = y - middelPixelIndexHeight;
//variable to store the new values that are being calculated
bool pixelEnabled = true;
//checks if the structure isn't out of bounce
if ((structureStartPositionX < 0 || structureStartPositionY < 0) ||
(structureStartPositionX + structureWidth > image.Size.Width || structureStartPositionY + structureHeight > image.Size.Height))
{
newPixels[x, y] = Image.White;
continue;
}
//Loop through the structure
for (int k = 0; k < structureWidth; k++)
{
for (int l = 0; l < structureHeight; l++)
{
int pixelColor = image.GetPixelColor(structureStartPositionX + k, structureStartPositionY + l);
bool ForeGroundValue = structure.Foreground.GetValue(k, l);
bool BackGroundValue = structure.Background.GetValue(k, l);
if (ForeGroundValue && pixelColor == Image.Black) continue;
if (BackGroundValue && pixelColor == Image.White) continue;
if (!ForeGroundValue && !BackGroundValue) continue;
pixelEnabled = false;
break;
}
}
if(pixelEnabled)
{
pixelEnabled = true;
}
newPixels[x, y] = (pixelEnabled) ? Image.Black : Image.White; //sets new value
}
}
Image newImage = Subtraction.ApplyBlackWhite(image, new Image(newPixels, image.Size));
image.SetPixels(newImage.GetPixels());
}
