Modulation Transfer Function (infrared Imaging)
The modulation transfer function (MTF) is used to approximate the position of best focus of an infrared imaging system. In an imaging system, best focus is typically achieved when the MTF is between 0.4 and 0.6; most often at 0.5 (50% cutoff frequency of the MTF) MTF is inversely related to the minimum resolvable temperature difference (MRTD), which is a measure of an infrared sensor's ability to resolve temperature difference. MTF is defined as the discrete fourier transform of the line spread function (LSF). The LSF can be calculated by two different methods. One includes measuring the LSF directly from an idealized line approximation provided by an image of a slit target. The other involves differentiating the edge spread function (ESF).
Read more about Modulation Transfer Function (infrared Imaging): ESF Evaluation, LSF Evaluation, MTF Evaluation, See Also
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