Function point Wide Web, a concept that in physics, medicine, and science of video application have a great and PSF can be shown.

each system, a reaction and reply in front of a function blow true (i.e. the source point) and with the combination (convolution) with it, an output or resulting image) that determines the characteristics of the system. In other words, the system responds to the function point wide (PSF) the result of the impact of a system on a function, tap or source, the point is that a signal or image fading (no sharpness or edge) in the day the place or time to happen.