Tone correction for multi-level halftoned images

Details Tone correction for multi-level halftoned images Tone correction for multi-level halftoned images

1995-06-06

1998-05-19

Vu, Kim

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358429, 358298, 358455, 358460, 358534, 358532, 358536, 345199, 345201, H04N 140, H04N 141, H04N 121, H04N 146

Patent

active

057543097

ABSTRACT:
A multi-level image output device performs correction of pixel values which have undergone halftone processing to compensate for non-linearities. This correction is carried out by means of a tonal reproduction transfer function, which linearizes the output values from a halftone processor before they are applied to an image generator, such as a laser modulator. By rectifying non-linear intensity of individual pixels, images can be generated with a smoother grayscale gradient. The function of the post-halftone correction can be combined with a modulator, to achieve an economy of components which make up the output device. As a further feature, a plurality of post-halftoning correction devices can be provided. One of these devices is selected to correct the data values produced by halftone processing, in dependence upon the values of neighboring pixels in an image.

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patent: 5321523 (1994-06-01), Hashimoto
patent: 5337167 (1994-08-01), Hiratsuka et al.
patent: 5339171 (1994-08-01), Fujisawa et al.
Adobe Systems Incorporated, "Postscript Language Reference Manual", 2nd Edition, 1990, pp. 307-309, 293-294.

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