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Suppose that an object which reflects or emits light is captured by a sensor. The image data are distorted in various ways. The aim is to restore the object. For this purpose, a new restoration method is devised. It uses the Fisher-information based principle of extreme physical information (EPI). This solves a variational problem I−J=extremum, expressing a flow of information J→I from source to output...
It is shown on the basis of Fisher information that the ultimate root-mean square uncertainty in the position of a single photon of wavelength λ is 0.112λ in vacuum. This is as well an “effective size” for the photon.
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