Back to results
US 4,308,551 AGranted
Color television camera with test pattern
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Ohnuma, Shiomi Kanie, Toshio Araki
Life of this patent
Estimating the term…
Abstract
This specification discloses a color television camera having a test pattern projecting device. This test pattern projecting device projects a test pattern image of a desired color temperature onto an image pickup device. The color temperature of the test pattern image is adjustable.
Claims2
A television camera having a test pattern projector, comprising:
- an objective lens;
- a color resolving optical system disposed on the optic axis of said objective lens;
- an image pickup device for photographing a monochromatic image formed by said objective lens and said color resolving optical system;
- a test pattern chart projecting device including a test pattern chart for forming a monochromatic test pattern image on said image pickup device;
- and
- a variable color temperature illuminating device for illuminating said test pattern chart, said illuminating device comprising at least two light sources having different wavelength widths, a plurality of circuits having different set values for setting the quantity of light of said light sources, and a switching circuit for selectively applying the signal from said setting circuit to said light sources.
3 more elements
Dependencies are inferred from the claim text.