3. The method according to claim 2 , wherein the changes to the character size comprises at least one of changes to character height and width; the changes to the character position in the page layout comprises at least one of changes to horizontal position, vertical position; the changes to the character font comprises at least one of changes to character stroke length, stroke shape, relative positioning of strokes, stroke width, stroke slope.
2. The method according to claim 1 , wherein each class of the layout transformation comprises at least one of changes to character size, character position in a page layout and character font.