Infrared correction system
First Claim
1. An imaging method comprising:
- sequentially producing a first output indicative of incident infrared radiation and the absence of incident visible light and a second output indicative of incident radiation in both the visible and infrared spectra; and
subtracting said first and second outputs to produce an output corrected for infrared and dark current noise.
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Accused Products
Abstract
An imaging system using a color shutter receives signals indicative of color information in a plurality of planes together with infrared information and a signal indicative of the infrared radiation alone. The infrared radiation signal may be subtracted from the signals associated with the color planes to develop signals free of infrared radiation effects for each of the desired color planes. In addition an infrared signal is available which may have useful applications in some situations. In this way, color information color bands may be obtained without the need an infrared filter and infrared information is retained for use in other applications if desired. In addition infrared and dark current information may be derived that can be used for dark current correction.
101 Citations
24 Claims
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1. An imaging method comprising:
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sequentially producing a first output indicative of incident infrared radiation and the absence of incident visible light and a second output indicative of incident radiation in both the visible and infrared spectra; and
subtracting said first and second outputs to produce an output corrected for infrared and dark current noise. - View Dependent Claims (2, 3, 4)
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5. An imaging system comprising:
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a device sequentially tunable in a first state to transmit infrared radiation and radiation in the visible spectrum and in a second state to substantially block light in the visible spectrum while transmitting infrared radiation; and
a subtracter to subtract signals indicative of the infrared radiation transmitted in said first and second sequential states. - View Dependent Claims (6, 7, 8, 9)
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10. A method comprising:
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sequentially producing a first and second signal, said first signal to indicate the transmission of visible and infrared radiation and said second signal to indicate the transmission of infrared radiation; and
subtracting said second signal from said first signal. - View Dependent Claims (11, 12, 13)
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14. A method comprising:
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sequentially providing a first and a second filter, said first filter transmitting infrared light with visible light and said second filter selectively transmitting infrared light;
detecting the transmittance of light through said first and second filters;
providing a first output indicative of light transmittance through said first filter;
providing a second output indicative of light transmittance through said second filter; and
subtracting said second output from said first output to correct for infrared and dark current interference. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A device comprising:
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a first filter and a second filter, said first filter to selectively block visible radiation while allowing infrared radiation and said second filter to allow infrared radiation with visible radiation;
an image sensor to sense the radiation allowed by said first and second filters; and
a subtracter to subtract the radiation allowed by said first sensor from the radiation allowed by said second sensor. - View Dependent Claims (22, 23, 24)
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Specification