Image reading apparatus and method

Details Image reading apparatus and method Image reading apparatus and method

1988-07-20

1990-04-03

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358464, 358466, H04N 140

Patent

active

049145240

ABSTRACT:
An image reading apparatus for converting an image on a document having a white/black text area into a display signal. An image reader scans pixels forming the image to produce a read signal having a level corresponding to the brightness density of each of the scanned pixels. The read image is compared with a dither matrix data signal and converted into a dither converted signal. The read image is also compared with a threshold value and converted into a binary signal having a first level representing a white pixel and a second level representing a black pixel. A discrimination circuit receives the binary signal for producing a detection signal when the white/black text area is scanned. Upon occurrence of the detection signal, the dither converted signal is mixed with the binary signal to form the display signal.

REFERENCES:
patent: 4342051 (1980-04-01), Suzuki et al.
patent: 4495522 (1982-07-01), Matsunawa et al.
patent: 4628366 (1986-12-01), Yamada
patent: 4709274 (1987-11-01), Tanioka
patent: 4723173 (1988-02-01), Tanioka
patent: 4729035 (1988-03-01), Tanioka

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