More Advanced Details
OTF may be broken down into the magnitude transfer function and phase transfer function components as follows:
where
where the function returns the complex argument, and is the spatial frequency in the x- and y-plane, respectively.
Phase is critically important to adaptive optics and holographic systems.
The OTF is the Fourier transform of the incoherent Point Spread Function.
The modulation transfer function represents the Bode plot of an imaging system (such as a microscope or the human eye), and thus depicts the filtering characteristic of the imaging system. The human eye, for instance, acts as a low-pass filter, in that very high-frequency components (sharp edges) cannot be perfectly perceived.
In the case of the Scanning Electron Microscope (SEM), the electron detectors do not capture the phase of the electrons, and, therefore, the PTF can be disregarded, leaving the MTF equivalent to the OTF.
Read more about this topic: Optical Transfer Function
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