Reproducible gray scale test chart for television cameras

Details Reproducible gray scale test chart for television cameras Reproducible gray scale test chart for television cameras

1984-03-20

1986-03-11

Bell, Paul A.

Printed matter

Calendar

356243, 358139, B42D 1500, G01J 102, H04N 1700

Patent

active

045751242

ABSTRACT:
A gray scale test chart for television cameras, in the form of either a transmittance chart or reflectance chart, includes one or more regions having selected gray values for calibrating or adjusting the output signal of the television camera, each gray value region being formed by an array of uniformly black dots arranged on a uniformly white background in a spatial frequency selected with respect to the resolution capability of the camera to produce an integrated output signal while being within the resolution capability of a photographic or other chart reproduction technique, the size of the dots in each region determining its gray value in combination with the spatial frequency or center-to-center spacing of the dots.

REFERENCES:
patent: 2657611 (1953-11-01), Borth
patent: 2763833 (1956-08-01), Brumbaugh
patent: 3612760 (1971-10-01), McKechnie
patent: 3879749 (1975-04-01), Baum
patent: 4285004 (1981-08-01), Morrison et al.

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