Method for screening an image

Details Method for screening an image Method for screening an image

2011-03-22

2011-03-22

Lee, Thomas D (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003060

Reexamination Certificate

active

07911651

ABSTRACT:
To improve the rendering of a printing, a halftone rendering method is applied. This method optimally comprises a step for the adaptive tiling of the image. This tiling is based on a subdivision of the image by self-similar structures. These subdivisions are locally limited by the local intensity of the image. These local limitations make the tiling adaptive. The result of this tiling is a cloud of sampling structures, each of these structures being associated with a pixel of the image and a label produced during the tiling. The intensity of the pixel, and the label, enable the reading, in a table of correction vectors, of a correction vector corresponding to a shift to be applied to the pixel before it is printed. The table of the correction vectors is pre-computed in using a relaxation algorithm.

REFERENCES:
patent: 4894726 (1990-01-01), Steinhardt et al.
patent: 2003/0123093 (2003-07-01), Hattori
patent: 1 111 905 (2001-06-01), None
Glassner, “Penrose Tiling,” IEEE Computer Graphics & Applications, IEEE Inc. New York, USA, 18(4):78-86 (1998).
Ulichney, “Dithering With Blue Noise,” Proceedings of the IEEE, IEEE, New York, USA, 76(1):56-79 (1988).

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