Towards Expressive Optics: A Design System for Scene-Specific External Lens Filters

Abstract

This study proposes an external lens filter system that enables users to design and realize optical effects based on their expressive intent. Through this system, users can freely configure both visual effects and geometric design elements, enabling them to fabricate custom lens filters tailored to their desired aesthetics. The filters are fabricated using a low-cost SLA 3D printer, and optical quality suitable for practical use is achieved through post-processing with spin coating. Furthermore, we demonstrate that the proposed method supports various visual expressions, including the control of optical effect regions through clear openings, the integration of multiple optical functions within a single filter, and the fabrication of fine typographic patterns whose visibility dynamically changes depending on the aperture setting.