Patent Number: 6,307,972

Title: Method and apparatus for generating a bitmap

Abstract: A method of generating a bitmap representative of an original image. The method comprises (1) scanning the original image to generate a greyscale pixel map; (2) interpolating and rotating the greyscale pixel map to generate a higher resolution greyscale pixel map; and (3) converting the higher resolution greyscale pixel map into the bitmap. The greyscale pixel map is converted into the bitmap by (I) ranking each greyscale pixel value against the greyscale pixel values of a neighborhood of adjacent pixel locations; (ii) determining a desired number of black binary pixels (B_Pc) in the neighborhood; (iii) comparing the rank of the greyscale pixel with the desired number of black binary pixels; and (iv) assigning a black binary pixel value to the pixel location when the comparison carried out in step (iii) satisfies a predetermined condition.

Inventors: Riley; Andrew James (Bedfordshire, GB), Gouch; Martin Philip (Herts, GB)

Assignee: Fujifilm Electronic Imaging Ltd

International Classification: G06T 3/40 (20060101); G06K 009/36 (); G06K 009/46 ()

Expiration Date: 10/23/2018