IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0753431
(2001-01-02)
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발명자
/ 주소 |
- Young, Jr., Robert S.
- Ball, Richard D.
- Bishop, Mark S.
- Digby, Marc C.
- Hansen, Christopher P.
- Hinkle, II, Clyde W.
- Cannata, Philip E.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
8 인용 특허 :
120 |
초록
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One aspect of the present invention is a system for estimating sensor and illumination non-uniformities. The system comprises a first light source, and a first sensor operable to capture light reflected from a first side of film illuminated by the light source while the film has a developer chemical
One aspect of the present invention is a system for estimating sensor and illumination non-uniformities. The system comprises a first light source, and a first sensor operable to capture light reflected from a first side of film illuminated by the light source while the film has a developer chemical applied thereto and processing circuitry coupled to the first sensor. The processing circuitry is operable to capture a first plurality of readings from the sensor responsive to light reflected from an unexposed region of film to determine a first set of non-uniformity data and adjust image data obtained from the film in response to the first set of non-uniformity data. In a further embodiment, the processing circuitry is further operable to dim the first light source for at least a portion of the time that the sensor is being used to sense the unexposed region of the film. The processing circuitry may also capture a second plurality of readings from the sensor while the first light source is dimmed to determine a second set of non-uniformity data and adjust image data obtained from the film in response to the second set of non-uniformity data.
대표청구항
▼
One aspect of the present invention is a system for estimating sensor and illumination non-uniformities. The system comprises a first light source, and a first sensor operable to capture light reflected from a first side of film illuminated by the light source while the film has a developer chemical
One aspect of the present invention is a system for estimating sensor and illumination non-uniformities. The system comprises a first light source, and a first sensor operable to capture light reflected from a first side of film illuminated by the light source while the film has a developer chemical applied thereto and processing circuitry coupled to the first sensor. The processing circuitry is operable to capture a first plurality of readings from the sensor responsive to light reflected from an unexposed region of film to determine a first set of non-uniformity data and adjust image data obtained from the film in response to the first set of non-uniformity data. In a further embodiment, the processing circuitry is further operable to dim the first light source for at least a portion of the time that the sensor is being used to sense the unexposed region of the film. The processing circuitry may also capture a second plurality of readings from the sensor while the first light source is dimmed to determine a second set of non-uniformity data and adjust image data obtained from the film in response to the second set of non-uniformity data. todetector while preventing spectral bands in the plurality of spectral bands other than the second spectral band from reaching the photodetector, and generating, with the wavelength-monitoring circuit, a second signal representing the quality characteristic of the modulated or unmodulated pattern of light in the second spectral band. 2. The method of claim 1, where the first and second signals represent, for the first and second spectral bands, one or more of signal-to-noise ratio, bit error rate, optical power level, and optical wavelength center frequency. 3. The method of claim 1, wherein: the modulation pattern implements SONET STS-1 frames; and the first and second signals represent specific bytes in the SONET frames. 4. A method of monitoring input light having a plurality of spectral bands, the method comprising: during each of a plurality of successive time intervals corresponding to the plurality of spectral bands, separating a different corresponding spectral band of the plurality of spectral bands from the plurality of spectral bands, directing the separated spectral band to the photodetector while preventing the spectral bands other than the separated spectral band from reaching the photodetector, and generating, with the wavelength-monitoring circuit, a signal representing a quality characteristic of a modulated or unmodulated pattern of light in the separated spectral band, the quality characteristic being one or more of signal-to-noise ratio, bit error rate, specific bytes in SONET frames, and optical wavelength center frequency. 5. Apparatus for monitoring input light having a plurality of spectral bands, the apparatus comprising: an optical train that intercepts the input light and provides optical paths for routing the spectral bands; a photodetector; a routing mechanism that operates to direct selected spectral bands to said photodetector; an electrical circuit coupled to said photodetector to provide a signal representing a quality characteristic of a modulated or unmodulated pattern of light impinging on said photodetector, the quality characteristic being one or more of signal-to-noise ratio, bit error rate, specific bytes in SONET frames, and optical wavelength center frequency; and a control circuit coupled to said routing mechanism to cause only a first selected spectral band to be directed to said photodetector during a first time interval and to cause only a second selected spectral band to be directed to said photodetector during a second time interval, whereby said electrical circuit provides, during said first and second intervals, respective first and second signals representing quality characteristic for the first and second selected spectral bands. 6. The apparatus of claim 5, and further comprising: an additional photodetector; and an additional electrical circuit that provides a signal representing optical power of those spectral bands other than the selected band. 7. The apparatus of claim 5, wherein said control circuit sequentially causes said routing mechanism to select each of the plurality of spectral bands so that the plurality of spectral bands are sequentially communicated to said photodetector in a round-robin fashion. 8. The apparatus of claim 5, wherein said optical train includes a dispersive element. 9. Apparatus for monitoring input light having a plurality of spectral bands, the apparatus comprising: an optical train that intercepts input light and provides optical paths for routing the spectral bands, wherein said input light is subject to a modulation pattern that implements SONET STS-1 frames; a photodetector; a routing mechanism that operates to direct selected spectral bands to said photodetector; an electrical circuit, coupled to said photodetector, that provides a signal representing specific bytes in the SONET frames of said modulated pattern of light impinging on said photodetector; and a control circuit coupled to said
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