Method of determining the proper amount of exposure

Details Method of determining the proper amount of exposure Method of determining the proper amount of exposure

1995-05-02

1998-02-17

Moses, R. L.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 32, 355 38, 355 67, 355 77, G03B 2772

Patent

active

057195404

ABSTRACT:
The improved method of determining the proper amount of exposure comprises the steps of reading the entire portion of an original image, calculating the characteristic quantities of a principal image in the original image, determining a particular density range from the calculated characteristic quantities of the principal image, extracting only the pixels in said particular density range from the entire portion of the original image to determine the characteristic quantities of the original image, and determining the proper amount of exposure from said characteristic quantities of the original image. When applied to various types of optical image forming apparatus such as copiers, printers and pictographic devices, the method can determine the proper amount of exposure by a simple scanning procedure even if the original to be duplicated is a negative film or other medium having density failure and it hence ensures the formation of the proper and high-quality image in a consistent manner.

REFERENCES:
patent: 3677641 (1972-07-01), King et al.
patent: 4120581 (1978-10-01), Takahashi et al.
patent: 5210570 (1993-05-01), Minamisawa et al.
patent: 5278921 (1994-01-01), Nakamura et al.
patent: 5475493 (1995-12-01), Yamana
patent: 5502776 (1996-03-01), Manabe
patent: 5561494 (1996-10-01), Terashita

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