Methods and system for producing a temperature map of a scene

• US 9,531,964 B2
• Filed: 03/12/2014
• Issued: 12/27/2016
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: DRS Network & Imaging Systems, LLC (Leonardo S.p.A.)
• Original Assignee: DRS Network & Imaging Systems, LLC (Leonardo S.p.A.)
• Inventors: Southerland, Richard L., Blettner, Douglas A., Hutchison, David C., Neal, Henry W.
• Primary Examiner(s): Do, Anh
• Application Number:
  US14/206,297
• Publication Number:
  US 20150281598A1
• Time in Patent Office: 1,021 Days
• Field of Search: 382/254, 382/274, 382/199, 382/103, 250/316.1, 250/330, 348/164, 348/219.1, 348/241, 348/E5.081, 701/31.4, 701/33.2
• US Class Current: 1/1
• CPC Class Codes: G01J 2005/0077 Imaging
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01J 5/10 using electric radiation detectors
• CPC Class Codes: G01J 5/48 Thermography; Techniques using wholly visual means
• CPC Class Codes: G06T 3/40 Scaling of whole images or parts thereof, e.g. expanding or contracting
• CPC Class Codes: G06T 5/00 Image enhancement or restoration
• CPC Class Codes: G06T 5/90 Dynamic range modification of images or parts thereof
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 21/23439 for generating different versions
• CPC Class Codes: H04N 21/23605 Creation or processing of packetized elementary streams [PES]
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 5/33 Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20

Abstract

A method includes receiving thermal data of a scene. The thermal data includes a plurality of frames of thermal infrared data. The method also includes generating a temperature map based on at least the thermal data. The temperature map is generated prior to a contrast enhancement process of the thermal data. The method further includes transmitting the temperature map and the thermal data concurrently in a data channel as a data stream.

Claims

1. A method of generating a temperature map of a scene, the method comprising:

receiving, at a detector, thermal data of the scene, wherein the thermal data includes a plurality of frames of thermal infrared data;

generating the temperature map based on at least the thermal data, wherein the temperature map is generated prior to a contrast enhancement process of the thermal data; and

transmitting, using a data channel interface, the temperature map and the thermal data concurrently in a data channel as a data stream.

2. The method of claim 1, further comprising creating a mapping for each frame of the plurality of frames based on the thermal data, wherein the temperature map is generated based on the mapping.

3. The method of claim 1, further comprising:

correcting the non-uniformity in the plurality of frames of the thermal infrared data, wherein each frame of the plurality of frames includes an array of pixels; and

replacing bad pixels detected in the array of pixels for each frame of the plurality of frames of thermal infrared data.

4. The method of claim 3, wherein the contrast enhancement process comprises AGC.

5. The method of claim 4 further comprising throttling a data rate of the thermal data, wherein the data rate is dynamically adjusted.

6. The method of claim 5, further comprising adjusting a resolution of the thermal data.

7. The method of claim 1 wherein a portion of the temperature map is transmitted concurrently with one frame in the plurality of frames of the thermal infrared data.

8. The method of claim 7 wherein the thermal data of the scene comprises thermal video.

9. The method of claim 1 wherein transmitting the temperature map and the thermal data in a data channel comprises separately transmitting the temperature map and the thermal data in the data channel.

10. The method of claim 1 wherein generating the temperature map comprises using a lookup table.

11. The method of claim 1, further comprising:

encoding the temperature map in a data stream; and

communicating with a wireless communication network to receive and transmit the data stream to one or more external devices.

12. The method of claim 1, further comprising receiving and transmitting the data stream to one or more external devices using one or more communication interfaces, including USB, FireWire, mini USB, and/or other high-speed data interfaces.

13. The method of claim 1 wherein the thermal infrared data comprises digital thermal infrared data.

14. An apparatus for generating a temperature map of a scene, the apparatus comprising:

a detector configured to receive thermal data of the scene, wherein the thermal data includes a plurality of frames of thermal infrared data;

a calibrated mapper configured to create a mapping for each frame of the plurality of frames based on the thermal infrared data;

a temperature map generator configured to generate the temperature map using the mapping; and

a data channel interface configured to transmit the temperature map separately from the thermal infrared data.

15. The apparatus of claim 14 wherein the detector comprises a thermal detector operable to detect radiation in LWIR region between 8 and 14 μ

m.

16. The apparatus of claim 14, further comprising a throttle configured to throttle a data rate of the temperature map.

17. The apparatus of claim 16 wherein the throttle is further configured to dynamically adjust the data rate of the temperature map to manage bandwidth.

18. The apparatus of claim 16, further comprising an A/D converter coupled to the detector, a non-uniformity correction and bad pixel replacement block coupled to the A/D converter, and an automatic gain control block coupled to the throttle, and a multiplexer operable to select an output from one of the A/D converter, the non-uniformity correction and bad pixel replacement block, the throttle, or the automatic gain control block for the data channel interface.

19. The apparatus of claim 14 wherein the temperature map generator is further configured to adjust a resolution of the temperature map to manage bandwidth.

20. The apparatus of claim 14 wherein the data channel interface is further configured to:

encode the temperature map in a data stream; and

communicate with a wireless communication network to receive and transmit the data stream to one or more external devices.

21. The apparatus of claim 14 wherein the data channel interface is further configured to receive and transmit the data stream to one or more external devices using one or more communication interfaces, including USB, FireWire, mini USB, and/or other high-speed data interface.

22. The apparatus of claim 14 wherein the thermal infrared data comprises digital thermal infrared data.