Image processing apparatus with conversion and reconversion of t

Details Image processing apparatus with conversion and reconversion of t Image processing apparatus with conversion and reconversion of t

1994-01-21

1998-06-02

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 358455, 358456, 382252, 382272, H04N 140

Patent

active

057609187

ABSTRACT:
In an image processing apparatus in which digital data of a certain number (m) of levels are converted into digital data of a larger number (n) of levels, then subjected to certain desired editing processing, and again digitized to data of the original number (m) of levels. The redigitization to m levels is conducted by determining the average density of a predetermined area, utilizing data of pixels already redigitized to m levels, and redigitizing the data of n levels into m levels, utilizing the average value. This process significantly reduces the amount of data processing required without formation of an unpleasant texture on the image resulting from errors in digitization.

REFERENCES:
patent: 4876610 (1989-10-01), Ohsawa et al.
patent: 4931881 (1990-06-01), Matsui et al.
patent: 5027221 (1991-06-01), Hisatake et al.
patent: 5121446 (1992-06-01), Yamada et al.
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5153925 (1992-10-01), Tanioka et al.

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