Sensor apparatus and method for low-frequency scene suppression and fixed pattern noise suppression
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-027/14
H04N-005/232
G01J-005/20
출원번호
UP-0292253
(2008-11-14)
등록번호
US-7671318
(2010-04-21)
발명자
/ 주소
Tener, Gene D.
Goodnough, Mark A.
출원인 / 주소
Lockheed Martin Corporation
대리인 / 주소
Birch, Stewart, Kolasch & Birch, LLP
인용정보
피인용 횟수 :
2인용 특허 :
5
초록▼
An imaging circuit comprises an image detector, accumulator coupled to the image detector, a focus/defocus mechanism focusing and defocusing an optical image onto the image detector; and a controller operatively connected to the focus/defocus mechanism, wherein the controller controls the focus/defo
An imaging circuit comprises an image detector, accumulator coupled to the image detector, a focus/defocus mechanism focusing and defocusing an optical image onto the image detector; and a controller operatively connected to the focus/defocus mechanism, wherein the controller controls the focus/defocus mechanism to focus and defocus the optical image onto the image detector to provide focused and defocused images; where the controller controls the focus/defocus mechanism to focus the optical image onto the image detector to provide charge carriers of the focused image onto the accumulator, where the accumulator accumulates the charge carriers of the focused image, the controller controls the focus/defocus mechanism to defocus the optical image onto the image detector to provide charge carriers of the defocused image onto the accumulator, where the accumulator subtracts the charge carriers of the defocused image, and the imaging circuit reads out the charge carriers from the accumulator representative of a low pass filtered version of the focused image.
대표청구항▼
What is claimed is: 1. An imaging circuit, comprising: an image detector; accumulator coupled to the image detector; a focus/defocus mechanism focusing and defocusing an optical image onto the image detector; and a controller operatively connected to the focus/defocus mechanism, wherein the control
What is claimed is: 1. An imaging circuit, comprising: an image detector; accumulator coupled to the image detector; a focus/defocus mechanism focusing and defocusing an optical image onto the image detector; and a controller operatively connected to the focus/defocus mechanism, wherein the controller controls the focus/defocus mechanism to focus and defocus the optical image onto the image detector to provide focused and defocused images; wherein the controller controls the focus/defocus mechanism to focus the optical image onto the image detector to provide charge carriers of the focused image onto the accumulator, where the accumulator accumulates the charge carriers of the focused image, the controller controls the focus/defocus mechanism to defocus the optical image onto the image detector to provide charge carriers of the defocused image onto the accumulator, where the accumulator subtracts the charge carriers of the defocused image, and the imaging circuit reads out the charge carriers from the accumulator representative of a low pass filtered version of the focused image. 2. The imaging circuit according to claim 1, further comprises: an input optics optically coupled to the focus/defocus mechanism, wherein the input optics gathers the optical image and relays the optical image to the focus/defocus mechanism. 3. The imaging circuit according to claim 1, further comprising: a switch is coupled between the image detector and the accumulator, wherein the controller controls the switch to accumulate the charge carriers of the focused image on the accumulator by using a fill port of the accumulator, and the controller controls the switch to subtract the charge carriers of the defocused image from the accumulator by using a drain port of the accumulator. 4. The imaging circuit according to claim 1, wherein the controller controls the focus/defocus mechanism to successively focus and defocus the optical image onto the image detector to provide focused and defocused images. 5. The imaging circuit according to claim 1, wherein the accumulator is an integration capacitor located within a sensor readout integrated circuit. 6. The imaging circuit according to claim 5, further comprising: a switch is coupled between the image detector and the integration capacitor, wherein the controller controls the switch to accumulate the charge carriers of the focused image on the integration capacitor by using a fill port of the integration capacitor, and the controller controls the switch to subtract the charge carriers of the defocused image from the integration capacitor by using a drain port of the integration capacitor. 7. The imaging circuit according to claim 1, wherein the focus/defocus mechanism comprises: a lens; and an aperture stop device that restricts the amount of light entering the lens; wherein the controller controls the aperture stop device by restricting and unrestricting an aperture of the aperture stop device to restrict/unrestrict the diameter of the light that can enter the lens. 8. The imaging circuit according to claim 7, wherein the aperture stop device is an LCD device and the LCD device provides an outer annular shape preventing light from passing though the LCD device to restrict light entering the lens. 9. The imaging circuit according to claim 8, wherein the LCD device provides an inner annular shape located inward of the outer annular shape that allows light to pass through to the lens. 10. The imaging circuit according to claim 8, wherein the LCD device adjusts the aperture by adjusting the diameter of the outer annular shape to adjust an amount of light that is restricted to enter through the lens. 11. The imaging circuit according to claim 1, wherein the focus/defocus mechanism comprises: a lens; and an electro mechanical actuator coupled to said lens; wherein the controller controls the lens position along an axis of incident light by applying an electrical signal to the electro mechanical actuator thereby moving the lens. 12. The imaging circuit according to claim 11, wherein the electro mechanical actuator is a piezoelectric actuator. 13. The imaging circuit according to claim 11, wherein the electro mechanical actuator is a stepper motor. 14. The imaging circuit according to claim 1, wherein the image detector is connected to an electro mechanical actuator, and the controller controls the image detector position along an axis of incident light by applying an electrical signal to the electro mechanical actuator thereby moving the image detector. 15. The imaging circuit according to claim 14, wherein the electro mechanical actuator is a piezoelectric actuator. 16. The imaging circuit according to claim 14, wherein the electro mechanical actuator is a stepper motor. 17. The imaging circuit according to claim 1, wherein the image detector is connected to a first electro mechanical actuator, the controller controls the image detector position along an axis of incident light by applying an electrical signal to the first electro mechanical actuator thereby moving the image detector, and wherein the focus/defocus mechanism comprises: a lens; and a second electro mechanical actuator coupled to said lens; wherein the controller controls the lens position along the axis of incident light by applying an electrical signal to the second electro mechanical actuator thereby moving the lens. 18. An imaging method, comprising the steps of: controlling a focus/defocus mechanism to provide a focused image on a image sensor; accumulating charge carriers on an accumulator of a readout circuit, the accumulated charge carriers being representative of the focused image; controlling the focus/defocus mechanism to provide a defocused image on a image sensor; subtracting charge carriers from the accumulator, the subtracted charge carriers being representative of the defocused image; and reading out the charge carriers from the accumulator representative of a low pass filtered version of the focused image. 19. The imaging method according to claim 18, wherein the steps of: controlling a focus/defocus mechanism to provide a focused image on a image sensor; accumulating charge carriers on an accumulator of a readout circuit, the accumulated charge carriers being representative of the focused image; controlling the focus/defocus mechanism to provide a defocused image on a image sensor; subtracting charge carriers from the accumulator, the subtracted charge carriers being representative of the defocused image; and reading out the charge carriers from the accumulator representative of a low pass filtered version of the focused image; are repeated a predetermined number of times. 20. An imaging circuit, comprising: a capacitor; a first detector coupled to a first side of the capacitor; a second detector coupled to a second side of the capacitor; and a beam splitter splitting a light beam into a first light beam and a second light beam, where the first light beam is relayed to the first detector and the second light beam is relayed to the second detector, wherein the effective path length from the beam splitter to the first detector is different than the effective path length from the beam splitter to the second detector, the first detector provides charge carriers of a focused image onto the first side of the capacitor and the second detector provides charge carriers of a defocused image onto the second side of the capacitor, and the imaging circuit reads out the charge carriers from the capacitor representative of a low pass filtered version of the focused image. 21. The imaging circuit according to claim 20, further comprising: an input optics optically coupled to the beam splitter, wherein the input optics gathers the optical image and relays the optical image to the beam splitter. 22. The imaging circuit according to claim 20, further comprising: a mirror which relays the second light beam from the beam splitter to the second detector. 23. The imaging circuit according to claim 1, wherein the image detector is either a quantum or thermal detector.
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