Image processing device performing the conversion of gradation v

Details Image processing device performing the conversion of gradation v Image processing device performing the conversion of gradation v

1997-11-20

2000-10-17

Lee, Thomas D.

Image analysis

Image compression or coding

Quantization

382253, H04N 140

Patent

active

06134351&

ABSTRACT:
When gradation values of an original image are converted, a pixel data read unit reads out a piece of pixel data, and a pixel data conversion unit converts the gradation value of the piece of pixel data. A condition judging unit decides whether a pixel corresponding to the piece of pixel data satisfies a predetermined condition, and a data conversion correction unit corrects by a stochastic process the conversion performed by the pixel data conversion unit when the condition judging unit decides that the piece of pixel data satisfies the predetermined condition.

REFERENCES:
patent: 4734770 (1988-03-01), Matsuba
patent: 4955065 (1990-09-01), Ulichney
patent: 5745660 (1998-04-01), Kolpatzik et al.
patent: 5781176 (1998-07-01), Rey et al.
patent: 5838462 (1998-11-01), Ebner et al.
patent: 5859955 (1999-01-01), Wang

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