18 May 2012 Noise estimation of an MTF measurement
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The modulation transfer function (MTF) measurement is critical for understanding the performance of an EOIR system. Unfortunately, due to both spatially correlated and spatially un-correlated noise sources, the performance of the MTF measurement (specifically near the cutoff) can be severely degraded. When using a 2D imaging system, the intrinsic sampling of the 1D edge spread function (ESF) allows for redundant samples to be averaged suppressing the noise contributions. The increase in the signal-to-noise will depend on the angle of the edge with respect to the sampling along with the specified re-sampling rate. In this paper, we demonstrate how the information in the final ESF can be used to identify the contribution of noise. With an estimate of the noise, the noise-limited portion of MTF measurement can be identified. Also, we demonstrate how the noise-limited portion of the MTF measurement can be used in combination with a fitting routine to provide a smoothed measurement.
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David P. Haefner, David P. Haefner, Stephen D. Burks, Stephen D. Burks, } "Noise estimation of an MTF measurement", Proc. SPIE 8355, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXIII, 835506 (18 May 2012); doi: 10.1117/12.917723; https://doi.org/10.1117/12.917723


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