Modeling and Compensating Temperature-Dependent Non-Uniformity Noise in IR Microbolometer Cameras
AbstractImages rendered by uncooled microbolometer-based infrared (IR) cameras are severely degraded by the spatial non-uniformity (NU) noise. The NU noise imposes a fixed-pattern over the true images, and the intensity of the pattern changes with time due to the temperature instability of such cameras. In this paper, we present a novel model and a compensation algorithm for the spatial NU noise and its temperature-dependent variations. The model separates the NU noise into two components: a constant term, which corresponds to a set of NU parameters determining the spatial structure of the noise, and a dynamic term, which scales linearly with the fluctuations of the temperature surrounding the array of microbolometers. We use a black-body radiator and samples of the temperature surrounding the IR array to offline characterize both the constant and the temperature-dependent NU noise parameters. Next, the temperature-dependent variations are estimated online using both a spatially uniform Hammerstein-Wiener estimator and a pixelwise least mean squares (LMS) estimator. We compensate for the NU noise in IR images from two long-wave IR cameras. Results show an excellent NU correction performance and a root mean square error of less than 0.25
Externally hosted supplementary file 1
Description: The following videos are available as Supplementary Material: Video 1 is the raw output of the camera; Video 2 and Video 3 are the output produced by regular TPC at 29C and 26C, respectively; and Video 4 is the output produced by the method proposed in this article.
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Wolf, A.; Pezoa, J.E.; Figueroa, M. Modeling and Compensating Temperature-Dependent Non-Uniformity Noise in IR Microbolometer Cameras. Sensors 2016, 16, 1121.
Wolf A, Pezoa JE, Figueroa M. Modeling and Compensating Temperature-Dependent Non-Uniformity Noise in IR Microbolometer Cameras. Sensors. 2016; 16(7):1121.Chicago/Turabian Style
Wolf, Alejandro; Pezoa, Jorge E.; Figueroa, Miguel. 2016. "Modeling and Compensating Temperature-Dependent Non-Uniformity Noise in IR Microbolometer Cameras." Sensors 16, no. 7: 1121.
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