Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-19
1993-12-07
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358454, 358459, 358460, 358465, 358298, H04N 140
Patent
active
052687724
ABSTRACT:
Three or more conversion functions are prepared. Only a part of the conversion functions are extracted therefrom to specify provisional conversion functions. A reference solid-pixel number and imaginary solid-pixel numbers for each provisional conversion function are computed through an imaginary exposure for a quarter halftone-dot block on a scanning line. The imaginary solid-pixel numbers are computed in response to new image signals which are obtained by converting an image signal through the respective provisional conversion functions. Then, each of the imaginary solid-pixel numbers is compared with the reference solid-pixel number, thereby a most-approximate conversion function, which gives a solid-pixel number most approximate to the reference solid-pixel number, is selected among the conversion functions. An exposure control signal is generated by comparing an image signal which is obtained by converting the image signal through the most-approximate conversion function with a corresponding screen threshold value.
REFERENCES:
patent: 4673971 (1987-06-01), Ikuta et al.
patent: 4926267 (1990-05-01), Shu et al.
patent: 4942480 (1990-07-01), Shu
patent: 4977464 (1990-12-01), Ikuta
patent: 4984097 (1991-01-01), Shu
patent: 5067025 (1991-11-01), Kitagawa
"Proceedings of the 18th Joint Conference on Image Technology", Dec. 9, 1962.
Coles Sr. Edward L.
Dainippon Screen Mfg. Co,. Ltd.
Williams Kimberly A.
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