Image processing apparatus for converting a multilevel image sig

Details Image processing apparatus for converting a multilevel image sig Image processing apparatus for converting a multilevel image sig

1992-09-18

1996-08-27

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358534, 358429, H04N 146

Patent

active

055506470

ABSTRACT:
An image processing apparatus includes a bit conversion part for converting an input multilevel image signal obtained via raster scanning into an output multilevel image signal through an MTF correction processes; a bi-level rendition part for performing a bi-level rendition processes with respect to the output multilevel image signal so that a first bi-level image signal is produced, and for performing a pseudo halftone rendition process with respect to the input multilevel image signal to generate a second bi-level image signal; a discrimination part for detecting whether a picture element indicated by the input multilevel image signal is located in a halftone region of an original image or in a bi-level region thereof, and an image synthesizing part for outputting the first bi-level image signal to an output device when the picture element is detected as being located in the bi-level region of the original image and for outputting the second bi-level image signal to the output device when the picture element is detected as being located in the halftone region of the original image.

REFERENCES:
patent: 4953013 (1990-08-01), Tsuji et al.
patent: 4965744 (1990-10-01), Wagatsuma et al.
patent: 5131059 (1992-07-01), Kobayashi et al.
patent: 5250948 (1993-10-01), Berstein et al.
patent: 5267330 (1993-11-01), Masuda

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