Thermal image frame capture using de-aligned sensor array
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04N-005/33
H04N-005/365
출원번호
US-0893809
(2013-05-14)
등록번호
US-9843742
(2017-12-12)
발명자
/ 주소
Garrow, Stanley H.
Högasten, Nicholas
Hoelter, Theodore R.
Strandemar, Katrin
Boulanger, Pierre
Sharp, Barbara
Kurth, Eric A.
Ingerhed, Malin
출원인 / 주소
FLIR Systems, Inc.
대리인 / 주소
Haynes and Boone, LLP
인용정보
피인용 횟수 :
0인용 특허 :
77
초록▼
Various techniques are provided to capture one or more thermal image frames using an infrared sensor array that is fixably positioned to substantially de-align rows and columns of infrared sensors. In one example, an infrared imaging system includes an infrared sensor array comprising a plurality of
Various techniques are provided to capture one or more thermal image frames using an infrared sensor array that is fixably positioned to substantially de-align rows and columns of infrared sensors. In one example, an infrared imaging system includes an infrared sensor array comprising a plurality of infrared sensors arranged in rows and columns and adapted to capture a thermal image frame of a scene exhibiting at least one substantially horizontal or substantially vertical feature. The infrared imaging system also includes a housing. The infrared sensor array is fixably positioned within the housing to substantially de-align the rows and columns from the feature while the thermal image frame is captured.
대표청구항▼
1. An infrared imaging system comprising: an infrared sensor array comprising a plurality of infrared sensors arranged in rows and columns and adapted to capture a thermal image frame of a scene exhibiting at least one horizontal or vertical feature;a housing;wherein the infrared sensor array is per
1. An infrared imaging system comprising: an infrared sensor array comprising a plurality of infrared sensors arranged in rows and columns and adapted to capture a thermal image frame of a scene exhibiting at least one horizontal or vertical feature;a housing;wherein the infrared sensor array is permanently positioned within the housing during manufacture to intentionally de-align the rows and columns from the at least one horizontal or vertical feature while the thermal image frame is captured to distribute the at least one feature across a plurality of the de-aligned rows and columns;a processing device adapted to perform a row and column noise reduction process on the captured thermal image frame to determine and apply row and column fixed pattern noise offset terms to provide a processed thermal image frame, wherein the distribution of the feature across the de-aligned rows and columns causes the processed thermal image frame to exhibit reduced row and column noise artifacts resulting from the row and column noise reduction process; andwherein the permanent position of the infrared sensor array relative to and within the housing is configured to passively de-align the rows and columns while the infrared imaging system is capturing the thermal image frame, andwherein the infrared imaging system is adapted to be operated to capture the thermal image frame without rotating the infrared sensor array from the permanent position. 2. The infrared imaging system of claim 1, wherein: the housing comprises a surface parallel to the at least one feature; andthe infrared sensor array is permanently positioned within the housing to intentionally de-align the rows and columns from the surface while the thermal image frame is captured. 3. The infrared imaging system of claim 2, wherein the surface is a planar external surface of the housing. 4. The infrared imaging system of claim 1, wherein the infrared sensor array is rotationally offset relative to the housing. 5. The infrared imaging system of claim 1, wherein the infrared sensor array is rotationally offset about an optical axis of the infrared imaging system. 6. The infrared imaging system of claim 1, wherein: the captured thermal image frame comprises rows and columns of pixels intentionally de-aligned from the at least one feature; andthe processing device, for the row and column noise reduction process, is adapted to: calculate, for each pixel, a difference between a center pixel and a plurality of neighboring pixels to determine column neighbor differences,generate, for each column of pixels, a histogram of the column neighbor differences,use the column neighbor differences to determine column noise offset terms for corresponding columns of pixels, andapply column noise filter correction to the captured image based on the column noise offset terms, wherein the column noise offset term is applied to at least a majority of the pixels in each corresponding column. 7. The infrared imaging system of claim 1, wherein the thermal image frame is an unblurred thermal image frame, wherein the processing device, for the row and column noise reduction process, is adapted to: receive an intentionally blurred thermal image frame;process the blurred thermal image frame to determine a plurality of non-uniformity correction (NUC) terms; andapply the NUC terms to the unblurred thermal image frame. 8. A method of operating the infrared imaging system of claim 1, the method comprising: capturing the thermal image frame while the rows and columns are intentionally de-aligned from the at least one feature. 9. An infrared imaging system comprising: an infrared sensor array comprising a plurality of infrared sensors arranged in rows and columns and adapted to capture a thermal image frame of a scene exhibiting at least one horizontal or vertical feature;a housing comprising a surface parallel to the at least one feature;wherein the infrared sensor array is permanently positioned within the housing during manufacture to intentionally de-align the rows and columns from the surface while the thermal image frame is captured to distribute the at least one feature across a plurality of the de-aligned rows and columns;a processing device adapted to perform a row and column noise reduction process on the captured thimble image frame to determine and apply row and column fixed pattern noise offset terms to provide a processed thermal image frame, wherein the distribution of the feature across the de-aligned rows and columns causes the processed thermal image frame to exhibit reduced row and column noise artifacts resulting from the row and column noise reduction process; andwherein the permanent position of the infrared sensor array relative to and within the housing is configured to passively de-align the rows and columns while the infrared imaging system is capturing the thermal image frame, andwherein the infrared imaging system is adapted to be operated to capture the thermal image frame without rotating the infrared sensor array from the permanent position. 10. The infrared imaging system of claim 9, wherein the surface is a planar external surface of the housing. 11. The infrared imaging system of claim 9, wherein the infrared sensor array is permanently positioned within the housing to intentionally de-align the rows and columns from the at least one feature while the thermal image frame is captured. 12. The infrared imaging system of claim 9, wherein the infrared sensor array is rotationally offset relative to the housing. 13. The infrared imaging system of claim 9, wherein the infrared sensor array is rotationally offset about an optical axis of the infrared imaging system. 14. The infrared imaging system of claim 9, wherein: the captured thermal image frame comprises rows and columns of pixels intentionally de-aligned from the at least one feature; andthe processing device, for the row and column noise reduction process, is adapted to: calculate, for each pixel, a difference between a center pixel and a plurality of neighboring pixels to determine column neighbor differences,generate, for each column of pixels, a histogram of the column neighbor differences,use the column neighbor differences to determine column noise offset terms for corresponding columns of pixels, andapply column noise filter correction to the captured image based on the column noise offset terms, wherein the column noise offset term is applied to at least a majority of the pixels in each corresponding column. 15. The infrared imaging system of claim 9, wherein the thermal image frame is an unblurred thermal image frame, the processing device, for the row and column noise reduction process, is adapted to: receive an intentionally blurred thermal image frame;process the blurred thermal image frame to determine a plurality of non-uniformity correction (NUC) terms; andapply the NUC terms to the unblurred thermal image frame. 16. A method of operating the infrared imaging system of claim 9, the method comprising: capturing the thermal image frame while the rows and columns are intentionally de-aligned from the at least one feature. 17. A method comprising: capturing a thermal image frame of a scene exhibiting at least one substantially horizontal or vertical feature;wherein the capturing is performed by an infrared sensor array comprising a plurality of infrared sensors arranged in rows and columns;wherein the infrared sensor array is permanently positioned within a housing of an infrared imaging system, the infrared sensory array being permanently positioned within the housing during manufacture to intentionally de-align the rows and columns from the at least one substantially horizontal or vertical feature while the thermal image frame is captured;performing row and column noise reduction process on the captured thermal image frame to determine and apply row and column fixed pattern noise offset terms to provide a processed thermal image frame;wherein a distribution of the feature across the de-aligned rows and columns causes the processed thermal image frame to exhibit reduced row and column noise artifacts resulting from the row and column noise reduction process; andwherein the permanent position of the infrared sensor array relative to and within the housing is configured to passively de-align the rows and columns while the infrared imaging system is capturing the thermal image frame, andwherein the infrared imaging system is adapted to be operated to capture the thermal image frame without rotating the infrared sensor array from the permanent position. 18. The method of claim 17, further comprising: providing the infrared sensor array;providing the housing; andpermanently positioning the infrared sensor array within the housing to intentionally de-align the rows and columns. 19. The method of claim 17, wherein: the housing comprises a surface parallel to the at least one feature; andthe infrared sensor array is fixably and securely positioned within the housing to intentionally de-align the rows and columns from the surface while the thermal image frame is captured. 20. The method of claim 19, wherein the surface is a planar external surface of the housing. 21. The method of claim 17, wherein the infrared sensor array is rotationally offset relative to the housing. 22. The method of claim 17, wherein the infrared sensor array is rotationally offset about an optical axis of the infrared imaging system. 23. The method of claim 17, wherein: the captured thermal image frame comprises rows and columns of pixels intentionally de-aligned from the at least one feature; andthe method further comprises: calculating, for each pixel, a difference between a center pixel and a plurality of neighboring pixels to determine column neighbor differences,generating, for each column of pixels, a histogram of the column neighbor differences,using the column neighbor differences to determine column noise offset terms for corresponding columns of pixels, andapplying column noise filter correction to the captured image based on the column noise offset terms, wherein the column noise offset term is applied to at least a majority of the pixels in each corresponding column. 24. The method of claim 17, wherein: the thermal image frame is an unblurred thermal image frame; andthe method further comprises: receiving an intentionally blurred thermal image frame,processing the blurred thermal image frame to determine a plurality of non-uniformity correction (NUC) terms, andapplying the NUC terms to the unblurred thermal image frame. 25. An infrared imaging system adapted to be operated in accordance with the method of claim 17.
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