Sampling

Sampling

By sampling of a continuous function f(x,y) is understood the finding out of the values of samples in regular intervals. We can understand it also as being a transition from a continuous to a discrete case. In this way, we obtain a new function: V(x,y). Concurrently, we will use the fact that 'pixel' is not a point, but an area of the non-zero value. This area is represented by a certain value. We call this 'point sampling' such sampling as where we obtain values at one point. In the case of 'area sampling' we assign to the area a single value, in most cases a variable value of the area. But this method is demanding on calculation, and therefore, we try to approximate area sampling by several point samples, and then to average them.


$$$APPLET

Sampling of the continuous function (left) into the discrete one (right).

$$$APPLET

Sampling applet. Author Štulrajterová Paulína

Source code

Copyright (c) 1999-2017 Juraj Štugel. www.netgraphics.sk