Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-10-23
1983-07-26
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 9535
Patent
active
043957307
ABSTRACT:
An automatic color-temperature compensation device for television cameras, comprising three filters adapted to pass color rays of the three primary colors, or red, green and blue rays of light from the surroundings, three sensors respectively adapted to detect the red, green and blue rays and to produce an electric signal in response to the detected red, green and blue rays respectively; three log amplifiers for amplifying respective electrical signals; two ratio circuit devices each adapted to compare two of the three electrical signals and produce a ratio output in response to the ratio difference of the two compared electrical signals; two anti-log amplifiers to respectively amplify the two ratio outputs; two comparators for respectively comparing the two amplified ratio outputs with two reference voltages which are so selected as to be equal to the respective ratio outputs at a predetermined color temperature, say 3200.degree. K.; the comparators each being adapted to produce a control signal in response to the respective, compared two ratio outputs to be applied to respective gain controlling circuits of two of three signal systems of the camera system to make up or to offset the "gains" of two signals decreased or increased because of the change in color temperature from what was pre-determined, so that the camera system operates as if it were at the pre-determined color temperature.
REFERENCES:
patent: 3627911 (1971-12-01), Kubota
patent: 3877068 (1975-04-01), Kosaka
patent: 4123775 (1978-10-01), Bugni
patent: 4218699 (1980-08-01), Dischert
patent: 4308551 (1981-12-01), Ohnuma
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