Image reading apparatus

Details Image reading apparatus Image reading apparatus

1990-07-30

1991-03-19

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 54, 358163, 358455, 358461, 356404, 364722, G06K 900

Patent

active

050017683

ABSTRACT:
An image reading apparatus has a CCD sensor, a white standard plate of a uniform density, a shading data memory, an analog/log converter or a digital/log converter, and a shading correction circuit. Shading correction can be performed with a simple circuit and requiring only a small-capacity memory.

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patent: 4549220 (1985-10-01), Suzuki

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