/**
* Apply the edge detection algorithm to a BinaryImage.
* Returns a copy of the image passed as parameter and does not modify the original
**/
public static BinaryImage Apply(BinaryImage image)
{
BinaryImage mask = image.invert();
BinaryImage result;
// initalise result to 0's
bool[] bRes = new bool[image.Pixels.Length];
for (int i = 0; i < image.Pixels.Length; i++)
{
bRes[i] = false;
}
result = new BinaryImage(bRes, image.Width, image.Height);
for (int y = 0; y < image.Height; y++)
{
for (int x = 0; x < image.Width; x++)
{
bool res;
if (y + 1 < image.Height)
{
// shift the image down, AND it with the mask
res = mask.getPixel(x, y) && image.getPixel(x, y + 1);
// OR this result with the result array
result.setPixel(x, y, result.getPixel(x, y) || res);
}
if (y - 1 > 0)
{
// shift the image up, AND it with the mask
res = mask.getPixel(x, y) && image.getPixel(x, y - 1);
// OR this result with the result array
result.setPixel(x, y, result.getPixel(x, y) || res);
}
if (x - 1 > 0)
{
// shift the image left, AND it with the mask
res = mask.getPixel(x, y) && image.getPixel(x - 1, y);
// OR this result with the result array
result.setPixel(x, y, result.getPixel(x, y) || res);
}
if (x + 1 < image.Width)
{
// shift the image right, AND it with the mask
res = mask.getPixel(x, y) && image.getPixel(x + 1, y);
// OR this result with the result array
result.setPixel(x, y, result.getPixel(x, y) || res);
}
}
}
return(result);
}