Difference between Flood Fill and Boundary Fill Algorithm
Flood Fill Algorithm:
Algorithms used for filling interior-defined regions are generally known as Flood Fill Algorithm. Such an algorithm starts with a seed pixel by replacing its existing colour with the fill colour. Then using the 4-connected or 8-connected chain the algorithm sets fill colour to the other interior pixels. Assuming that all the pixels in an interior-defined region have the same colour, the flood fill algorithm terminates when no more connected pixel has the old colour.
Steps of Flood Fill Algorithm:
[c]Algorithm FloodFill4(x, y, original_Color, fill_Color)
{
Color=get_Color(x,y);
if(Color<>original_Color)
then
SetPixel(x, y, fill_Color);
FloodFill4(x, y, boundary_Color, fill_Color);
FloodFill4(x, y+1, boundary_Color, fill_Color);
FloodFill4(x-1, y, boundary_Color, fill_Color);
FloodFill4(x+1, y, boundary_Color, fill_Color);
Endif
}
[/c]
Boundary Fill Algorithm:
To fill a boundary-defined area is to start at a point (pixel) inside the area and paint the area progressively towards the boundary. This method is called Boundary Fill Algorithm. The Boundary Fill is a recursive procedure with a fill colour. It is specified by the parameter ‘fill‘ and boundary colour specified by parameter ‘boundary‘.
Steps of Boundary Fill Algorithm:
[c]Algorithm BoundaryFill4(x, y, boundary_Color, fill_Color)
{
Color=get_Color(x,y);
if(Color<>boundary_Color and Color<>fill_Color)
then
SetPixel(x, y, fill_Color);
BoundaryFill4(x, y+1, boundary_Color, fill_Color);
BoundaryFill4(x-1, y, boundary_Color, fill_Color);
BoundaryFill4(x, y-1, boundary_Color, fill_Color);
BoundaryFill4(x+1, y, boundary_Color, fill_Color);
Endif
}[/c]
Flood Fill vs Boundary Fill Algorithm:
| 1. It defines the area containing several colors | 1. It defines the area with a single color |
| 2. It is slower than the Boundary-fill algorithm | 2. It is faster than the Flood-fill algorithm |
| 3. In Flood-fill algorithm, a random colour can be used to paint the interior portion then the old one is replaced with a new one. | 3. In Boundary-fill algorithm, the Interior points are painted by continuously searching for the boundary color. |
| 4. It requires high amount of memory consumption | 4. It requires low amount of memory consumption |
| 5. The complexity of Flood-fill algorithm is simple | 5. The complexity of Boundary-fill algorithm is high |