Lens for infrared camera

• US 20020079450A1
• Filed: 12/26/2000
• Published: 06/27/2002
• Est. Priority Date: 12/26/2000
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Wood, Roland Andrew
• Application Number:
  US09/748,756
• Publication Number:
  US 20020079450A1
• Time in Patent Office: Days
• US Class Current: 250/332
• CPC Class Codes: G02B 13/14 for use with infrared or ultraviolet radiation G02B13/008, G02B13/16 take precedence
• CPC Class Codes: H01L 27/14625 Optical elements or arrangements associated with the device
• CPC Class Codes: H01L 27/14649 Infrared imagers
• CPC Class Codes: H04N 25/61 the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4"

Abstract

A lightweight camera is provided that includes a lightweight lens system that has a reduced number of lenses. Reducing the number of lenses produces a lighter camera, but produces a distorted local image. The distorted local image is captured by the lightweight camera, and is preferably transmitted to a remote station. The remote station then performs image processing on the distorted image to remove at least some of the distortion in the image. Preferably, a Massively Parallel Richardson-Lucy (MPRL) algorithm is used to identify and remove distortion from the image.

Claims

1. A system for electronically capturing an image, comprising:

a lens system for producing a distorted image;

an array of detectors for capturing the distorted image produced by the lens system;

a transmitter for transmitting said distorted image; and

a ground station for receiving the distorted image transmitted by said transmitter, said ground station capable of at least partially correcting said distorted image using image processing techniques.

2. A system as in claim 1, wherein said lens system has a single optical element.

3. A system as in claim 1, wherein said lens system includes one or more optical elements that are formed of a substantially infra-red transmissive material.

4. A system as in claim 3, wherein said lens system includes one or more optical elements that are formed primarily of Germanium.

5. A system as in claim 1, wherein said detectors are infrared detectors.

6. A system as in claim 1, wherein said detectors are micro-bolometers.

8. A system as in claim 1, wherein said ground station at least partially corrects said distorted image using a maximum likelihood estimation algorithm.

9. A system as in claim 1, wherein said ground station at least partially corrects said distorted image using a Richardson-Lucy algorithm.

7. A system as in claim 7, wherein said transmitter and said ground station are physically separate from each other, wherein said transmitter is a radio frequency transmitting unit and said ground station is a radio frequency receiving unit.

10. A radiation detector device, comprising:

an array of radiation detector elements having outputs that vary as a function of the amount of radiation striking said detector elements;

a lens disposed over said detector array to form a distorted image on said detector array;

a selector for selecting each of said detector elements and outputting a detector output that corresponding to said selected detector element; and

a transmitter for transmitting signals that corresponds to each of said detector outputs.

11. A radiation detector device as in claim 10, wherein said lens has a single optical element.

12. A radiation detector device as in claim 10, wherein said radiation detector device has no shutter.

13. A radiation detector device as in claim 10, wherein each of the detector outputs is uncompensated for temperature.

14. A radiation detector device as in claim 11, wherein said optical element is formed of Germanium and is supported over said array of radiation detectors by one or more legs.

15. A radiation detector device as in claim 11, further comprising a temperature sensor having an output wherein said temperature sensor output is operably coupled to said transmitter and said transmitter transmits at least one signal corresponding to said temperature sensor output.

17. A system for sending and receiving radiation detector output values as in claim 16, wherein said lens comprises a single optical element.

18. A system for sending and receiving radiation detector output values as in claim 16, wherein said image processor executes a Richardson-Lucy algorithm.

19. A system for sending and receiving radiation detector output values as in claim 16, wherein said remote camera system has no shutter or temperature stabilizer.

20. A system for sending and receiving radiation detector values as in claim 19, wherein said remote camera system includes at least one temperature sensor having an output wherein said temperature sensor output is operably coupled to said transmitter and said transmitter transmits at least one signal corresponding to said temperature sensor output, said receiving system receives said transmitted temperature sensor signal, and compensates said distorted image at least in part as a function of said received temperature sensor signal.

16. A system for sending a plurality of radiation detector output values and receiving said sent radiation detector output values, comprising:

a remote camera system, the remote camera system having an array of radiation detector elements, each radiation detector element producing an output that is related to the amount of radiation that strikes the corresponding detector element, said remote camera system further including a lens system disposed over said detector array to form a distorted image on said detector array, said remote camera system further having a selector for selecting said detector elements and outputting a detector element output, said remote camera system further including a transmitter for transmitting signals that correspond to said detector element outputs; and

a receiving system having a receiver for receiving said transmitted signals, and an image processor for at least partially correcting said distorted image.

21. A method for capturing and processing an image, comprising:

receiving an image using a lens system, the lens system producing a distorted image;

capturing the distorted image using an array of detectors;

transmitting the captured distorted image;

receiving the distorted image at a remote station; and

processing the distorted image at the remote station to remove at least some distortion in the distorted image.