Test pattern projector for a color television camera

Details Test pattern projector for a color television camera Test pattern projector for a color television camera

1986-06-12

1987-07-21

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 10, 362324, 353108, 353102, 353 85, H04N 904

Patent

active

046822143

ABSTRACT:
A test pattern projector built into a color television camera, for adjusting the camera to desired conditions in order to attain a favorable quality of image immediately before use. A test pattern chart is illuminated with an illuminating light of an adjusted color temperature, forming an image of the test pattern chart on an image pickup apparatus. The color temperature adjustment of illuminating light emitted from a light source is effected by using a color temperature conversion filter and a color compensating filter both disposed in front of the light source. An interference filter or an absorbing filter with a wedge shape in cross section can be employed as the color compensating filter. The color correction depends, in the former, on the inclination thereof relative to the optical axis and, in the latter, on the thickness thereof intersecting the optical path.

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