Apparatus for automatically determining the densities of a graph

Details Apparatus for automatically determining the densities of a graph Apparatus for automatically determining the densities of a graph

1987-12-14

1990-07-17

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

364525, C01N 2100

Patent

active

049417460

ABSTRACT:
An automatic scanning densitometer which is self calibrating and accurately measures highlight density, shadow density and tonal distribution of midtones occurring in the subject matter of the photograph to be reproduced. A reflection densitometer is disclosed which in one or more scans identifies and measures first the highlight and shadow densities and the tonal distribution of the subject matter to be reproduced, as opposed to the background of the photo. The instrument automatically determines the size of the original and, with an input to the device, the size of the window in which the original is to be reproduced to provide enlargement or reduction. Measurement of density values are uniquely stabilized and with the use of a monolithic sensor on a single substrate the entire image is processed and measured, not just target areas which must be manually measured or aligned with an apertured scanning bar. Using plant press data as an input to the system, all values for a near perfect reproduction are rapidly displayed by the device and can be printed or can be used as an input for an exposure computer to automate the graphic arts reproduction process.

REFERENCES:
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patent: 4512662 (1985-04-01), Tobias
patent: 4609291 (1986-09-01), Takahashi
patent: 4666306 (1987-05-01), Matsumoto

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