Television camera and white balance correcting method
First Claim
1. A television camera which adjusts levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera comprising:
- an iris section for performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm;
a microcomputer for inputting the diaphragm signal from the iris section, and setting level adjusting values of the R, G, and B signals; and
white balance correcting means for adjusting levels of the R, G, and B signals according to the level adjusting values,wherein said white balance correcting means has three analog multipliers for multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected,wherein said microcomputer stores the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens,wherein in a condition in which the diaphragm of the taking lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients to said analog multipliers,wherein in a condition in which the diaphragm of the taking lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, and outputs said individually set multiplying coefficients to said analog multipliers,wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, andwherein said at least one arbitrary signal is the signal G.
1 Assignment
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Accused Products
Abstract
The white balance of a television camera is not lost and kept properly even if the diaphragm is opened to the utmost limit at a dark place. A signal F representing the diaphragm value of the taking lens is inputted from an iris part 2 into a microcomputer 8. The level adjusting values of the R, G, and B signals are set in the microcomputer 8 according to the diaphragm signal F and sent to a white balance correcting circuit 6. The correcting circuit 6 adjusts the levels of the R, G, and B signals to the same value according to the level adjusting values.
17 Citations
10 Claims
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1. A television camera which adjusts levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera comprising:
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an iris section for performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; a microcomputer for inputting the diaphragm signal from the iris section, and setting level adjusting values of the R, G, and B signals; and white balance correcting means for adjusting levels of the R, G, and B signals according to the level adjusting values, wherein said white balance correcting means has three analog multipliers for multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected, wherein said microcomputer stores the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the taking lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients to said analog multipliers, wherein in a condition in which the diaphragm of the taking lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, and outputs said individually set multiplying coefficients to said analog multipliers, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, and wherein said at least one arbitrary signal is the signal G.
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2. A television camera which adjusts levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera comprising:
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an iris section for performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; a microcomputer for inputting the diaphragm signal from the iris section, and setting level adjusting values of the R, G, and B signals; and white balance correcting means for adjusting levels of the R, G, and B signals according to the level adjusting values, wherein said white balance correcting means has three analog multipliers for multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected, wherein said microcomputer stores the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the taking lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients to said analog multipliers, wherein in a condition in which the diaphragm of the taking lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, and outputs said individually set multiplying coefficients to said analog multipliers, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, and wherein said at least one arbitrary signal is the signal R.
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3. A television camera which adjusts levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera comprising:
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an iris section for performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; a microcomputer for inputting the diaphragm signal from the iris section, and setting level adjusting values of the R, G, and B signals; and white balance correcting means for adjusting levels of the R, G, and B signals according to the level adjusting values, wherein said white balance correcting means has three analog multipliers for multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected, wherein said microcomputer stores the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the taking lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients to said analog multipliers, wherein in a condition in which the diaphragm of the taking lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, and outputs said individually set multiplying coefficients to said analog multipliers, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, and wherein said at least one arbitrary signal is the signal B.
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4. A television camera which adjusts levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera comprising:
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an iris section for performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; a microcomputer for inputting the diaphragm signal from the iris section, and setting level adjusting values of the R, G, and B signals; and white balance correcting means for adjusting levels of the R, G, and B signals according to the level adjusting values, wherein said white balance correcting means has three analog multipliers for multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected, wherein said microcomputer stores the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the taking lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients to said analog multipliers, wherein in a condition in which the diaphragm of the taking lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, and outputs said individually set multiplying coefficients to said analog multipliers, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens.
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5. A television camera which adjusts levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera comprising:
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an iris section for performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; a microcomputer for inputting the diaphragm signal from the iris section, and setting level adjusting values of the R, G, and B signals; and white balance correcting means for adjusting levels of the R, G, and B signals according to the level adjusting values, wherein said white balance correcting means has three analog multipliers for multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected, wherein said microcomputer stores the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the taking lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients to said analog multipliers, wherein in a condition in which the diaphragm of the taking lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, and outputs said individually set multiplying coefficients to said analog multipliers.
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6. A television camera white balance correcting method for adjusting levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera white balance correcting method comprising the steps of:
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a) performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; b) inputting the diaphragm signal from the step a) into a microcomputer, said microcomputer operative to set level adjusting values of the R, G, and B signals; c) adjusting the levels of the R, G, and B signals according to the level adjusting values; d) multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected; and e) storing the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients, and wherein in a condition in which the diaphragm of the lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals.
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7. A television camera white balance correcting method for adjusting levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera white balance correcting method comprising the steps of:
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a) performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; b) inputting the diaphragm signal from the step a) into a microcomputer, said microcomputer operative to set level adjusting values of the R, G, and B signals; c) adjusting the levels of the R, G, and B signals according to the level adjusting values; d) multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected; and e) storing the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients, and wherein in a condition in which the diaphragm of the lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, and wherein said at least one arbitrary signal is the signal G.
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8. A television camera white balance correcting method for adjusting levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera white balance correcting method comprising the steps of:
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a) performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; b) inputting the diaphragm signal from the step a) into a microcomputer, said microcomputer operative to set level adjusting values of the R, G, and B signals; c) adjusting the levels of the R, G, and B signals according to the level adjusting values; d) multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected; and e) storing the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients, and wherein in a condition in which the diaphragm of the lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, and wherein said at least one arbitrary signal is the signal R.
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9. A television camera white balance correcting method for adjusting levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera white balance correcting method comprising the steps of:
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a) performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; b) inputting the diaphragm signal from the step a) into a microcomputer, said microcomputer operative to set level adjusting values of the R, G, and B signals; c) adjusting the levels of the R, G, and B signals according to the level adjusting values; d) multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected; and e) storing the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients, and wherein in a condition in which the diaphragm of the lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens, and wherein said at least one arbitrary signal is the signal B.
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10. A television camera white balance correcting method for adjusting levels of R, G, and B signals obtained through a three-color separation optical system to maintain white balance, said television camera white balance correcting method comprising the steps of:
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a) performing an opening/closing operation of a diaphragm of a taking lens, and outputting a diaphragm signal indicating an opening condition of the diaphragm; b) inputting the diaphragm signal from the step a) into a microcomputer, said microcomputer operative to set level adjusting values of the R, G, and B signals; c) adjusting the levels of the R, G, and B signals according to the level adjusting values; d) multiplying individually the R, G, and B signals before being white balance corrected with multiplying coefficients thereto, and outputting individually the individually multiplied values as the R, G, and B signals after being white balance corrected; and e) storing the multiplying coefficients as said level adjusting values by bringing the multiplying coefficients into correspondence with a whole of diaphragm regions of the taking lens, wherein in a condition in which the diaphragm of the lens is not opened near to an opening end, said microcomputer outputs said stored multiplying coefficients, and wherein in a condition in which the diaphragm of the lens is opened near to the opening end, said microcomputer sets individually said multiplying coefficients in such a manner that a level of at least one arbitrary signal of the R, G, and B signals is made substantially even to that of at least one of other R, G, and B signals, wherein setting level adjusting values of the R, G, and B signals and level adjusting according to said setting are performed in response to a change in the diaphragm condition of said taking lens.
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Specification