Image processing capable of handling multi-level image data with

Details Image processing capable of handling multi-level image data with Image processing capable of handling multi-level image data with

1992-10-01

1995-02-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358531, 358532, 358534, H04N 140

Patent

active

053942507

ABSTRACT:
An image processing apparatus, which stochastically binary-converts lower-bit data of a pixel of interest to improve image quality in a highlight portion, as well as in a low-density portion, is provided. In an image processing apparatus for quantizing multi-value image data to binary data, multi-value image data of a pixel of interest is divided into upper- and lower-bit data by a calculator (24). The lower-bit data is binary-converted by a comparator (25) using a normalized uniform random number generated by a random number generator (26) as a threshold value. The binary-converted data is added to the upper-bit data of the image signal of the pixel of interest by an adder (22), and the sum data is binary-converted by a comparator (18) using one of a plurality of weighted average values of a plurality of pixels near the pixel of interest, which values are calculated by a calculator (600), on the basis of binary data of pixels, which have already been binary-converted before the pixel of interest. At this time, the density is preserved by distributing a density error generated upon binary conversion to non-binary-converted pixels near the pixel of interest by a circuit including a subtracter (17), an adder (22), and the like.

REFERENCES:
patent: 4764748 (1988-08-01), Geen et al.
patent: 5121446 (1992-06-01), Yamada et al.
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5130819 (1992-07-01), Ohta
patent: 5153925 (1992-10-01), Tanioka et al.

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