System and method for detecting, tracking and identifying a gas plume

• US 8,269,171 B2
• Filed: 09/21/2009
• Issued: 09/18/2012
• Est. Priority Date: 09/26/2008
• Status: Active Grant

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Original Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Inventors: Gorin, Brian A.
• Primary Examiner(s): Sung, Christine
• Application Number:
  US12/563,628
• Publication Number:
  US 20100078561A1
• Time in Patent Office: 1,093 Days
• Field of Search: 250/338.5
• US Class Current: 250/338.5
• CPC Class Codes: G01N 2021/1795 Atmospheric mapping of gases
• CPC Class Codes: G01N 2021/3531 without instrumental source, i.e. radiometric
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 21/3581 using far infrared light; using Terahertz radiation
• CPC Class Codes: G06T 2207/10036 Multispectral image; Hyperspectral image
• CPC Class Codes: G06T 7/0002 Inspection of images, e.g. flaw detection
• CPC Class Codes: G06T 7/254 involving subtraction of images

Abstract

A system and method for detecting, tracking and identifying a gas plume. The system comprises a processor and a detector in communication with the processor. The detector is effective to detect spectral radiance from a region of interest to detect first and second detected spectral radiance data with a known time difference. A database is in communication with the processor, the database includes a library. The processor is effective to create at least a first image and a second image from the first and second detected spectral radiance data and co-register the first and second images to produce a first co-registered image and a second co-registered image. The processor is further effective to subtract the first co-registered image from the second co-registered image to produce a difference image and generate a cluster region around a difference region in the difference image. The processor is further effective to analyze the spectral radiance from the cluster region to produce a spectral characteristic curve; and correlate the spectral characteristic curve against the library to identify the gas plume.

Claims

1. A method for detecting and identifying a gas plume, the method comprising:

receiving, by a processor, a request regarding a region of interest including a gas plume;

detecting, by a detector in communication with the processor, spectral radiance from the region of interest to detect first and second detected spectral radiance data;

creating, by the processor, at least a first image and a second image from the first and second detected spectral radiance data;

co-registering, by the processor, the first and second images to produce a first co-registered image and a second co-registered image, comprising;

a) selecting a spectral wavelength;

b) performing a pixel level comparison of the first and second images for the selected spectral wavelength to determine if an equivalent spectral wavelength value exists between the first and second images;

c) if an equivalent value exists between the first and second images, using the location of the pixel having the equivalent value to align the first and second images; and

d) if an equivalent value does not exists between the first and second images, selecting another spectral wavelength and returning to step b);

subtracting, by the processor, the first co-registered image from the second co-registered image to produce a difference image;

generating, by the processor, a cluster region around a difference region in the difference image;

analyzing, by the processor, the spectral radiance from the cluster region to produce a spectral characteristic curve; and

correlating, by the processor, the spectral characteristic curve against a library to identify the gas plume.

2. The method as recited in claim 1, wherein the analyzing the spectral radiance from the cluster region includes analyzing the spectral radiance from the cluster region at a particular time.

3. The method as recited in claim 1, wherein the analyzing the spectral radiance from the cluster region includes analyzing the spectral radiance from the cluster region in the particular difference image.

4. The method as recited in claim 1, wherein the detector detects spectral radiance in the LWIR range.

5. The method as recited in claim 1, wherein the method further comprises removing elevation effects from the first and second images.

6. The method as recited in claim 1, wherein the first image and the second image each have two dimensions relating to space and a third dimension relating to wavelength of the spectral radiance.

7. The method as recited in claim 6, wherein the co-registering includes, for at least one wavelength, lining up temporally adjacent images with the same origin.

8. The method as recited in claim 1, wherein the library is a gas plume model library.

19. The method as recited in claim 1, further comprising:

tracking movement of the gas plume based on a location and time of the gas plume.

9. A system for detecting and identifying a gas plume, the system comprising:

a processor;

a detector in communication with the processor, the detector effective to scan a region of interest to detect first and second detected spectral radiance data;

a database in communication with the processor, the database including a library;

wherein the processor is effective to

create at least a first image and a second image from the first and second detected spectral radiance data;

co-register the first and second images to produce a first co-registered image and a second co-registered image, comprising;

a) selecting a spectral wavelength;

b) performing a pixel level comparison of the first and second images for the selected spectral wavelength to determine if an equivalent spectral wavelength value exists between the first and second images;

c) if an equivalent value exists between the first and second images, using the location of the pixel having the equivalent value to align the first and second images; and

d) if an equivalent value does not exists between the first and second images, selecting another spectral wavelength and returning to step b);

subtract the first co-registered image from the second co-registered image to produce a difference image;

generate a cluster region around a difference region in the difference image;

analyze the spectral radiance from the cluster region to produce a spectral characteristic curve; and

correlate the spectral characteristic curve against the library to identify the gas plume.

10. The system as recited in claim 9, wherein the processor is further effective to receive a request regarding the region of interest and control the detector to detect the spectral radiance from the region of interest.

11. The system as recited in claim 9, wherein the analyzing the spectral radiance from the cluster region includes analyzing the spectral radiance from the cluster region at a particular time.

12. The system as recited in claim 9, wherein the analyzing the spectral radiance from the cluster region includes analyzing the spectral radiance from the cluster region in the difference image.

13. The system as recited in claim 9, wherein the detector detects spectral radiance in the LWIR range.

14. The system as recited in claim 9, wherein the method further comprises removing elevation effects from the first and second images.

15. The system as recited in claim 9, wherein the first image and the second image each have two dimensions relating to space and a third dimension relating to wavelength of spectral radiance.

16. The system as recited in claim 15, wherein the co-registering includes, for at least one wavelength, lining up temporally adjacent images with the same origin.

17. The system as recited in claim 9, wherein the library is a gas plume model library.

20. The system as recited in claim 9, wherein the processor is further effective to track a movement of the gas plume based on a location and time of the gas plume.

18. A method for detecting and identifying a gas plume, the method comprising:

receiving, by a processor, a request regarding a region of interest including a gas plume;

detecting, by a detector in communication with the processor, spectral radiance from the region of interest in the LWIR range to detect first and second detected spectral radiance data;

creating, by the processor, at least a first image and a second image from the first and second detected spectral radiance data, first image and the second image each have two dimensions relating to space and a third dimension relating to wavelength of the spectral radiance;

removing, by the processor, elevation effects in the first and second images;

co-registering, by the processor, the first and second images to produce a first co-registered image and a second co-registered image, the co-registering includes, for at least one wavelength, lining up temporally adjacent images with the same origin, comprising;

a) selecting a spectral wavelength;

b) performing a pixel level comparison of the first and second images for the selected spectral wavelength to determine if an equivalent spectral wavelength value exists between the first and second images;

c) if an equivalent value exists between the first and second images, using the location of the pixel having the equivalent value to line up the first and second images; and

d) if an equivalent value does not exists between the first and second images, selecting another spectral wavelength and returning to step b);

subtracting, by the processor, the first co-registered image from the second co-registered image to produce a difference image;

generating, by the processor, a cluster region around a difference region in the difference image;

analyzing, by the processor, the spectral radiance from the cluster region at a particular time to produce a spectral characteristic curve; and

correlating, by the processor, the spectral characteristic curve against a gas plume library to identify the gas plume.