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Reference.org
Two-dimensional window design
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<p>Windowing is a process where an index-limited sequence has its maximum energy concentrated in a finite frequency interval. This can be extended to an <i>N</i>-dimension where the <i>N</i>-D window has the limited support and maximum concentration of energy in a separable or non-separable <i>N</i>-D passband. The design of an <i>N</i>-dimensional window particularly a 2-D window finds applications in various fields such as <a href="/facts/Spectral_estimation_of_multidimensional_signals/9qNa18Wu">spectral estimation of multidimensional signals</a>, design of circularly symmetric and quadrantally symmetric non-recursive <a href="/facts/2D_Filters/2tBAC62m">2D filters</a>, design of optimal <a href="/facts/Convolution/PVPrdz9J">convolution</a> functions, image enhancement so as to reduce the effects of data-dependent processing artifacts, optical <a href="/facts/Apodization/Tc0rMnuV">apodization</a> and <a href="/facts/Antenna_array/HYRcdJsm">antenna array</a> design. </p>