Titlebook: Introduction to Image Processing; André Marion Book 1991 Springer Science+Business Media Dordrecht 1991 filtering.function.image processin

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Extension of the aperture notion,int viewed through a centred optical lens system will itself be a perfect point. We lay down a set of conditions such as Gauss’s approximation, whereby light beams have little slope relative to the axis and are very close to it, so that we can then ignore effects such as aberration.