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Hyuntae Joo, Soonhyeon Kwon, Sangmin Lee, Elmar Eisemann, and Sungkil Lee

Computer Graphics Forum (Proc. EGSR'16), 35(4), 99–105, 2016.
We present an efficient ray-tracing technique to render bokeh effects produced by parametric aspheric lenses. Contrary to conventional spherical lenses, aspheric lenses do generally not permit a simple closed-form solution of ray-surface intersections. We propose a numerical root-finding approach, which uses tight proxy surfaces to ensure a good initialization and convergence behavior. Additionally, we simulate mechanical imperfections resulting from the lens fabrication via a texture-based approach. Fractional Fourier transform and spectral dispersion add additional realism to the synthesized bokeh effect. Our approach is well-suited for execution on graphics processing units (GPUs) and we demonstrate complex defocus-blur and lens-flare effects.
Paper preprints, slides, supplementary materials, and Google Scholar entry
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@ARTICLE{joo16:nsrt, title={{Efficient Ray Tracing Through Aspheric Lenses and Imperfect Bokeh Synthesis}}, author={Hyuntae Joo and Soonhyeon Kwon and Sangmin Lee and Elmar Eisemann and Sungkil Lee}, journal={{Computer Graphics Forum (Proc. EGSR'16)}}, volume={35}, number={4}, pages={99--105}, year={2016} }

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