public static PNM ApplyDistanceTransform(this PNM image)
{
PNM binaryImage = image.ApplyCannyDetector();
int pixelCount = 0;
double[][] distanceMap = ToInitialDistanceMap(binaryImage, ref pixelCount);
CalculateDistances(distanceMap, pixelCount);
PNM distancedImage = new PNM(image.Width, image.Height);
for (int i = 0; i < image.Width * image.Height; i++)
{
byte distance = Filter.Coerce(distanceMap[i % image.Width][i / image.Width]);
distancedImage.SetPixel(i, distance, distance, distance);
}
return(distancedImage);
}