Image reader

Details Image reader Image reader

1988-03-29

1991-05-07

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 53, 358446, 358466, G06K 938

Patent

active

050143328

ABSTRACT:
An image reader comprises a line image sensor for reading images of an original for every line, a CPU for extracting the density level of the background based on the read image data for comparing the extracted density level with a reference level to find the difference, light adjusting circuit for adjusting the intensity of a lamp for exposing the original so as to make the difference obtained by the operation equal to 0 and a compare circuit for converting the read image data to binary data, wherein the adjustment of the intensity of the lamp by the light adjusting circuit is carried out in parallel to the conversion of the image data by the compare circuit.

REFERENCES:
patent: 4384272 (1983-05-01), Tanaka et al.
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4562486 (1985-12-01), Suzuki et al.
patent: 4760609 (1988-07-01), Tamagaki
patent: 4763200 (1988-08-01), Nakatani et al.

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