Image reading apparatus with image data overlap removal

Details Image reading apparatus with image data overlap removal Image reading apparatus with image data overlap removal

1983-07-14

1987-06-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358293, H01J 4014

Patent

active

046755330

ABSTRACT:
An image reading apparatus has a number of image sensors, a shading correction circuit, a linking circuit, and a CPU. The shading correction circuit has a RAM, a multiplication ROM, an address comparator, and a selector for correcting each pixel output. The linking circuit has shift memories for storing one-line image signals from the image sensors. The CPU controls addressing of the shift memories by means of address selectors and read/write counters. An image signal corresponding to a marker for linking output signals from the image sensors is replaced by an immediately preceding image signal. The adverse effect on shading correction of the marker for such linking is eliminated.

REFERENCES:
patent: 4146786 (1979-03-01), Agulnek
patent: 4314281 (1982-02-01), Wiggins
patent: 4358794 (1982-11-01), Kurakami
patent: 4439790 (1984-03-01), Yoshida
patent: 4449151 (1984-05-01), Yokoda
patent: 4465939 (1984-08-01), Tamura

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