Efficient Ray Tracing Through Aspheric Lenses and Imperfect Bokeh Synthesis

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, w...

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Veröffentlicht in:Computer graphics forum Jg. 35; H. 4; S. 99 - 105
Hauptverfasser: Joo, Hyuntae, Kwon, Soonhyeon, Lee, Sangmin, Eisemann, Elmar, Lee, Sungkil
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford Blackwell Publishing Ltd 01.07.2016
Schlagworte:
Analysis
Categories and Subject Descriptors (according to ACM CCS)
Computer graphics
Convergence
Exact solutions
Fourier transforms
Graphics processing units
I.3.3 [Computer Graphics]: Picture/Image Generation-Display Algorithms
Lenses
Mathematical analysis
Mathematical models
Optics
Spectra
Studies
ISSN:0167-7055, 1467-8659
Online-Zugang:Volltext
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Beschreibung
Zusammenfassung: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.
Bibliographie:Supporting InformationSupporting Information
ArticleID:CGF12953
istex:FA276FD1890295F3FEE21651866A6762BA6744C8
ark:/67375/WNG-161GJ1VX-4
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ISSN:0167-7055
1467-8659
DOI:10.1111/cgf.12953