The de la Vallée Poussin Standard Orientation Density Function

The de la Vallée Poussin standard orientation density functionν κ ( ω ) = C ( κ )cos ⁡ 2 κ( ω / 2 )is discussed with emphasis on the finiteness of its harmonic series expansion which, advantageouslydistinguishes it from other known standard functions. Given its halfwidth, the de la Vallée Poussin standard orientation density function allows, for example, to tabulate the degree of series expansion into harmonics required for its exact representation.