Research shows that applying Bartlett filters improves image quality by reducing edge ringing in optical systems, indicating effective solutions for coherent imaging systems.
The formation of straight-edge images by an optical system with a circular aperture apodized using Bartlett filters has been studied. One of the most common problems in coherent imaging systems is edge ringing. As the apodization parameter increases from 0 to 1, the severity of edge ringing reduces, and the edge gradient becomes smoother, but this comes at the cost of increased edge shift. Notably, when the Bartlett amplitude filter is applied with an apodization value of β = 1, and the system is affected by primary spherical aberration and defocus, edge ringing is almost completely eliminated.
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Shailaja et al. (2025) studied this question.
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