Method and apparatus for tone adjustment correction on rendering

Details Method and apparatus for tone adjustment correction on rendering Method and apparatus for tone adjustment correction on rendering

1994-12-08

1997-12-02

Vu, Kim

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358465, H04N 1407

Patent

active

056942249

ABSTRACT:
A method and apparatus for reproducing an original image includes a scanner or other image source for generating a digitized raw image data for each pixel area of an image. For each pixel the raw image data is transformed into a gray level rendering value pixel by comparing the raw image data value with threshold values from threshold mask sets. Tone adjustment means is provided for generating a tone corrected rendering gray level pixel value for each pixel. A printer or display is controlled to print the digitized image signal by rendering the dot regions in accordance with the tone corrected gray level rendering pixel value. Thus after a print is made a tone correction adjustment maybe made and in response to this tone adjustment a new print can be made using rendering image data in buffer memory without the need for rescanning of the image.

REFERENCES:
patent: 5200831 (1993-04-01), Tai
patent: 5204753 (1993-04-01), Tai
patent: 5258850 (1993-11-01), Tai
patent: 5300960 (1994-04-01), Pham et al.
patent: 5581295 (1996-12-01), Prowak

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