Abstract: The recognition rate of OCR (optical character recognition) is low because of the warped
document images. For those warped document images with header and footer lines, a fast method is
proposed to increase the rate of OCR in this paper. Firstly, the location of the header line is detected
and restored in the document image. Then the distance of the line moving upward or downward is
calculated based on geometric algorithm. After that, the image is scanned using the distance as
parameters and the distance that every target pixel needs to remove is calculated. At the same time, all
pixel are removed in order to restructure the image and then a well corrected image is obtained.
Experiments demonstrated that this correcting method was efficient. The OCR rate of warped
document image with header line could be significantly improved.

Key words: computer application, warped document, header and footer line, geometric distance;
image correct