Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-10-15
1994-05-31
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358465, 358530, 382 52, 348667, H04N 138, H04N 146, H04N 5213
Patent
active
053174208
ABSTRACT:
Color image data of which background is removed is converted into monochrome data and noise in the monochrome data is roughly discriminated in a first noise discrimination process. At the same time, the color and density of an attentional pixel, information area including a character or a picture, and others are checked, according to which operations the resulting first noise discrimination data is corrected in a second noise discrimination process. Substitute data is created from the image data of which background is removed according to the first noise discrimination data, and the substitute data substitutes for a pixel regarded as noise in the second noise discrimination process to obtain an image from which noise is eliminated. With the above arrangement, noise having a high density and noise having a size greater than the scanning window are eliminated without receiving influence from the surrounding noise.
REFERENCES:
patent: 4506382 (1985-03-01), Hada et al.
patent: 4747156 (1988-05-01), Wahl
Coles Sr. Edward L.
Matsushita Electric - Industrial Co., Ltd.
Rogers Scott A.
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