Method of positioning line scanning rasters in a color televisio

Details Method of positioning line scanning rasters in a color televisio Method of positioning line scanning rasters in a color televisio

1974-12-10

1976-10-19

Safourek, Benedict V.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 10, H04N 909

Patent

active

039874826

ABSTRACT:
When adjusting a color television camera a specific test pattern comprising dark and bright areas is used which is placed in the ambient light of a scene to be taken. By means of measuring locations in line scanning rasters the black level and the peak-white value in the test pattern signals are fixed at reference values. Thus the picture signals are given the nominal values matching the ambient light. Then other measuring locations are moved, by scanning raster displacement and/or scanning raster shaping, to bright-dark transitions in the image of the test pattern at which an intermediate reference value is provided. Absolute scanning raster positioning is carried out without being influenced by non-linearities, in contradistinction to the case when using a reference scanning raster.

REFERENCES:
patent: 2611816 (1952-09-01), Darke, Jr.
patent: 3404220 (1968-10-01), Favreau
patent: 3609219 (1971-09-01), Diehl
patent: 3692918 (1972-09-01), Olson et al.
patent: 3705839 (1972-12-01), Taylor

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