According to a method and apparatus for estimating a halftone image, a unit area is set and shifted by a focusing lens and a photoelectric transducer in a binary image consisting of black and white regions, and the halftone image is estimated on the basis of a ratio of the white regions to the black...http://www.google.fr/patents/US4758897?utm_source=gb-gplus-shareBrevet US4758897 - Method and apparatus for estimating halftone image from binary image
Method and apparatus for estimating halftone image from binary image
