Efficient Ray Tracing Through Aspheric Lenses and Imperfect Bokeh Synthesis

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• 作者：Hyuntae Joo ; Soonhyeon Kwon ; Sangmin Lee ; Elmar Eisemann and Sungkil Lee
• 刊名：Computer Graphics Forum
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：35
• 期：4
• 页码：99-105
• 全文大小：7392K
• ISSN：1467-8659

文摘

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.