Polyfocal display

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Polyfocal display is an interactive technique that allows to selectively zoom in a section of an image. Scaling is described by a (two–dimensional) magnification function, providing for generating several foci — each having induvidual magnification–parameters and correspondingly adjustable distortion in the regions further away from the focus.
File:Magnificationfunction.jpg
Magnification function

Polyfocal display was proposed by Naftali Kadmon and Eli Shlomi for presentation of statistical data on cartographic maps.