Optics
In optics, modulation transfer function indicates the capability of optical contrast transmission.
For example, when observing a series of black-white-light fringes drawn with a specific spatial frequency, the image quality may decay. White fringes fade while black ones turn brighter.
The modulation transfer function in a specific spatial frequency is defined by:
Where modulation (M) is computed from the following image or light brightness:
Read more about this topic: Transfer Function
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