9. The method of claim 1 , further comprising: setting said current line of text to a new line of text; generating a per text line difference value for said current line of text; and updating the cumulative difference value based on the per text line difference value for the current line of text.
10. The method of claim 9 , further comprising: inverting said page when said page is determined to be inverted; and storing, in memory, said inverted page in place of said page.