Image reading apparatus

Details Image reading apparatus Image reading apparatus

1992-02-21

1994-12-06

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358282, 358455, 358464, G06K 900, H04N 140

Patent

active

053716132

ABSTRACT:
An image reader comprises a platen on which an original is to be placed, a read unit for reading an image of the original placed on the platen, a first standard member having even density, a second standard member having even density and provided at a position different from the first standard member, a correction unit for correcting unevenness of a video signal resulted from reading the image of the original by the read unit on the basis of a first standard signal resulted from reading the first standard member by the read unit, and a compensation unit for compensating correction operation made by the correction unit on the basis of a second standard signal resulted from reading the second standard member by the read unit. The reader may also comprise an authorization unit for authorizing the compensation operation by the compensation unit. With the reader, unevenness of the video signal is always automatically corrected with satisfactory results.

REFERENCES:
patent: 4807045 (1989-02-01), Shimano
patent: 4888492 (1989-12-01), Arimoto
patent: 4985760 (1991-01-01), Maeshima et al.
patent: 5001768 (1991-03-01), Mita et al.
patent: 5062144 (1991-10-01), Murakami
patent: 5245383 (1993-04-01), Matsushita et al.
patent: 5253083 (1993-10-01), Hirota

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