LSF Evaluation
The line spread function (LSF) can be found using two different methods. It can be found directly from an ideal line approximation provided by a slit test target or it can be derived from the ESF. Using the latter method, the LSF is defined as the first derivative of the ESF, which is differentiated using numerical methods.
Since the ESF can not be differentiated analytically, it is numerically approximated using the finite difference:
where
- = the index
- = position of the pixel
- = ESF of the pixel
Read more about this topic: Modulation Transfer Function (infrared Imaging)
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