Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-12-16
1991-05-14
Oberley, Alvin E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358457, 358443, H04N 140
Patent
active
050161172
ABSTRACT:
An optical reading including a device for effecting discrimination between a dither-matrix reading area and a non-dither-matrix reading area on a subject copy, an irradiating device for irradiating local segments of the subject copy with light beams having different intensities, a reading device for obtaining image data representative of the presence or absence of an achromatic tone in each local segment based on an amount of the light beam reflected by each local segment, a control device for operating the irradiating and reading devices to irradiate the local segments in a predetermined discriminating zone of the subject copy with the light beams having different intensities at different times, to obtain first and second image data, a device for comparing the first and second image data of each local segment in the discrimination zone, to determine whether the first and second image data agree with each other or not for each local segment, and a device for determining that the discrimination zone is the dither-matrix reading area, if a degree of disagreement of the first and second image data exceeds a predetermined reference value, and determining that the discrimination zone is the non-dither-matrix reading area, if the degree of disagreement does not exceed the reference value.
REFERENCES:
patent: 4495522 (1985-01-01), Matsunawa et al.
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patent: 4660082 (1987-04-01), Tomohisa et al.
patent: 4663662 (1987-05-01), Sekizawa et al.
patent: 4686579 (1987-08-01), Sakamoto
patent: 4689692 (1987-08-01), Harano et al.
patent: 4709274 (1987-11-01), Tanioka
patent: 4740843 (1988-04-01), De Vogel et al.
Harano Tetsuo
Hattori Chikamasa
Kuwabara Kazuhiro
Matsumoto Takayuki
Matsumura Koji
Brother Kogyo Kabushiki Kaisha
Lee Thomas D.
Oberley Alvin E.
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