Method and system for target detection using an infra-red sensor

• US 6,897,446 B2
• Filed: 03/25/2003
• Issued: 05/24/2005
• Est. Priority Date: 03/26/2002
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Frey, Steven R. Jr., Chen, Hai-Wen, Olson, Teresa L.
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): TANINGCO, MARCUS H
• Application Number:
  US10/395,264
• Publication Number:
  US 20030183765A1
• Time in Patent Office: 791 Days
• Field of Search: 244/3.16, 702/191, 250/330, 342/52, 342/53, 342/54, 342/90, 342/195, 342/25, 342/161, 342/162
• US Class Current: 250/330
• CPC Class Codes: G06F 18/25 Fusion techniques
• CPC Class Codes: G06F 18/251 of input or preprocessed data
• CPC Class Codes: G06F 18/256 of results relating to different input data, e.g. multimodal recognition
• CPC Class Codes: G06T 2207/10048 Infrared image
• CPC Class Codes: G06T 5/40 using histogram techniques
• CPC Class Codes: G06T 5/92 based on global image properties

Abstract

A target detection and tracking system provides dynamic changing of the integration time (IT) for the system IR sensor within a discrete set of values to maintain a high sensor sensitivity. The system changes the integration time to the same or a different sensor integration time within the discrete set based on the image data output from the sensor satisfying pre-determined system parameter thresholds. The system includes an IT-related saturation prediction function allowing the system to avoid unnecessary system saturation when determining whether an IT change should be made. The tracking portion of the system provides tracking feedback allowing target objects with a low sensor signature to be detected without being obscured by nearby uninterested objects that produce system saturation.

Claims

1. A method for dynamically changing a target detection system parameter, comprising:

receiving image data, output from a sensor in a receiving system and generated using one of a discrete set of sensor integration times wherein each integration time being associated with a corresponding temperature range;

determining whether said image data satisfies at least one predetermined threshold; and

selecting the same one or a different sensor integration time for a succeeding frame of image data to produce a predetermined sensor sensitivity based on said image data satisfying said at least one predetermined threshold.

2. The method of claim 1, wherein said selecting includes selecting the same one or a different sensor integration time based on said image data not producing saturation in the system.

3. The method of claim 2, wherein said selecting includes selecting the same one sensor integration time based on predicting saturation being produced in the receiving system from the succeeding frame of said image data.

4. The method of claim 2, wherein said selecting includes selecting a different sensor integration time based on predicting saturation not being produced in the receiving system from a succeeding frame of said image data.

5. The method of claim 1, wherein said selecting includes selecting the same one sensor integration time based on said image data producing saturation and target tracking in the system.

6. The method of claim 1, wherein said selecting includes selecting the same one sensor integration time based on said image data including non-target data producing saturation and no target tracking in the system.

7. The method of claim 1, wherein said selecting includes selecting a different sensor integration time based on said image data including non-target data producing saturation and no target tracking in the system.

8. The method of claim 1, wherein said receiving includes receiving image data, output from a sensor in a receiving system and generated using one of a discrete set of less than five sensor integration times wherein each integration time being associated with a corresponding temperature range.

9. The method of claim 1, wherein said selecting includes selecting the same one or a different sensor integration time to produce a pre-determined sensor sensitivity and sensor target detection range based on said image data satisfying said at least one pre-determined threshold.

10. A system for dynamically changing a target detection system parameter, comprising:

a sensor for receiving image data in a receiving system and outputting image data using one of a discrete set of sensor integration times wherein each integration time being associated with a corresponding temperature range; and

a controller, interconnected to said sensor, for determining whether said image data satisfies at least one predetermined threshold and selecting the same one or a different sensor integration time for a succeeding frame of image data to produce a predetermined sensor sensitivity based on said image data satisfying said at least one predetermined threshold.

11. The system of claim 10, wherein said controller to select the same one or a different sensor integration time based on said image data not producing saturation in the system.

12. The system of claim 11, wherein said controller to select the same one sensor integration time based on predicting saturation being produced in the receiving system from a succeeding frame of said image data.

13. The system of claim 11, wherein said controller to select a different sensor integration time based on predicting saturation not being produced in the receiving system from a succeeding frame of said image data.

14. The system of claim 10, wherein said controller to select the same one sensor integration time based on said image data producing saturation and target tracking in the system.

15. The system of claim 10, wherein said controller to select the same one sensor integration time based on said image data including non-target data producing saturation and no target tracking in the system.

16. The system of claim 10, wherein said controller to select a different sensor integration time based on said image data including non-target data producing saturation and no target tracking in the system.

17. The system of claim 10, wherein said sensor to output image data using one of a discrete set of less than five sensor integration times wherein each integration time being associated with a corresponding temperature range.

18. The system of claim 10, wherein said controller to select the same one or a different sensor integration time to produce a predetermined sensor sensitivity and sensor target detection range based on said image data satisfying said at least one predetermined threshold.

19. A machine-readable medium having stored thereon a plurality of executable instructions, the plurality of instructions comprising instructions to:

determine whether received image data, generated and output from a sensor using one of a discrete set of sensor integration times wherein each integration time being associated with a corresponding temperature range, satisfies at least one predetermined threshold; and

select the same one or a different sensor integration time for a succeeding frame of image data to produce a predetermined sensor sensitivity based on said image data satisfying said at least one predetermined threshold.

20. The medium of claim 19, wherein said plurality of executable instructions include further instructions to select the same one or a different sensor integration time based on said image data not producing saturation in the system.

21. The system of claim 20, wherein said plurality of executable instructions include further instructions to select the same one sensor integration time based on predicting saturation being produced in the receiving system from a succeeding frame of said image data.

22. The system of claim 20, wherein said plurality of executable instructions include further instructions to select a different sensor integration time based on predicting saturation not being produced in the receiving system from a succeeding frame of said image data.

23. The system of claim 19, wherein said plurality of executable instructions include further instructions to select the same one sensor integration time based on said image data producing saturation and target tracking in the system.

24. The system of claim 19, wherein said plurality of executable instructions include further instructions to select the same one sensor integration time based on said image data including non-target data producing saturation and no target tracking in the system.

25. The system of claim 19, wherein said plurality of executable instructions include further instructions to output image data using one of a discrete set of less than five sensor integration times wherein each integration time being associated with a corresponding temperature range.

26. The system of claim 19, wherein said plurality of executable instructions include further instructions to select the same one or a different sensor integration time to produce a predetermined sensor sensitivity and sensor target detection range based on said image data satisfying said at least one predetermined threshold.