Measuring strip

Details Measuring strip Measuring strip

1990-12-17

1991-10-29

Haroian, Harry N.

Geometrical instruments

Miscellaneous

Light direction

33 1B, G01B 300

Patent

active

050603884

ABSTRACT:
A measuring strip for evaluating the quality of photographic half tone images which contains on a transparent base a test field (F) divided into at least two sub-fields, wherein (1) a first sub-field (F.sub.1) contains a plurality of individual areas each containing a group of opaque dots, wherein each individual area has dots of substantially equal size uniformly distributed in a transparent background area, and wherein (2) a second sub-field (F.sub.2) contains a plurality of individual areas each containing a group of transparent dots of substantially equal size uniformly distributed in an opaque background area, and wherein in each individual area containing (opaque or transparent) dots having substantially the same dot size the dots are at substantially equal distance from each other measured center-to-center and the dots are graduated in size in the areas of each said sub-field so that an area containing dots of smaller size contains more dots than an area containing dots of larger size, and wherein the light transmission of said first and second sub-field expressed as a percentage is different by at least 10%.

REFERENCES:
patent: 3109239 (1963-11-01), Wicker et al.
patent: 4527333 (1985-07-01), Warner

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