Computer Graphics Forum

Efficient Ray Tracing Through Aspheric Lenses and Imperfect Bokeh Synthesis

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

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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.

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@article{bib:joo:2016,
    author       = { Joo, Hyuntae and Kwon, Soonhyeon and Lee, Sangmin and Eisemann, Elmar and Lee, Sungkil },    
    title        = { Efficient Ray Tracing Through Aspheric Lenses and Imperfect Bokeh Synthesis },
    journal      = { Computer Graphics Forum },
    volume       = { 35 },
    year         = { 2016 },
    pages        = { 99--105 },
    doi          = { 10.1111/cgf.12953 },
    dblp         = { journals/cgf/JooKLEL16 },
    url          = { https://publications.graphics.tudelft.nl/papers/217 },
}