Image processing apparatus

Details Image processing apparatus Image processing apparatus

1990-10-16

1992-07-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, H04N 140

Patent

active

051308193

ABSTRACT:
An image processing apparatus that converts multi-level pixel data to binary pixel data and outputs it includes, in one embodiment, an input device for accepting multi-level pixel data, a binary conversion device for converting multi-level pixel data input from the input device to binary pixel data on the basis of a threshold value, an output device for outputting the binary pixel data which has been binarized by the binary conversion device, a first and a second memory in which errors and binary pixel data are stored, respectively, a correction device for correcting multi-level pixel data, a first and a second average density computation device for computing an average density value, a computation device for computing the average value of the average density values computed by the first and second average density computation devices as a threshold value, a detection device for detecting an error value, and a distribution device for distributing an error value to unbinarized pixel positions.

REFERENCES:
patent: 4876610 (1989-10-01), Ohsawa et al.
patent: 4878125 (1989-10-01), Katayama et al.
patent: 4891710 (1990-01-01), Nakazato et al.
patent: 5008950 (1991-04-01), Katayama et al.
patent: 5050000 (1991-09-01), Ng
patent: 5068746 (1991-11-01), Ohsawa et al.

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