Digital halftoning apparatus and method

Details Digital halftoning apparatus and method Digital halftoning apparatus and method

1996-03-18

1999-02-02

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382254, 358456, 358457, 358459, 358465, G06K 938, H04N 140

Patent

active

058676074

ABSTRACT:
A raster device such as a digital printer or the like which sequentially compares input image data with each element in a threshold matrix to convert the input image data into binary or multi-level pixel data. For providing both a higher resolution and a larger number of halftone levels for an output image at a low cost, an input image is decomposed into four color planes as CMYK data, and data on each color plane is compared with a dither matrix in a binarization circuit to be converted to binary data. The dither matrix generates a dither pattern composed of eight clusters having substantially the same shape as a kernel cluster capable of expressing 15 or more halftone levels. In this way, a smooth gradation having 120 or more halftone levels is realized by repetitively applying a small pattern having approximately 15 halftone levels.

REFERENCES:
patent: 5315669 (1994-05-01), Kumagai
patent: 5438634 (1995-08-01), Kumagai
patent: 5526445 (1996-06-01), Smutek et al.

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