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Sungkil Lee and Elmar Eisemann

Computer Graphics Forum (Proc. EGSR'13), 32(4), 1–6, 2013.
We present a practical real-time approach for rendering lens-flare effects. While previous work employed costly ray tracing or complex polynomial expressions, we present a coarser, but also significantly faster solution. Our method is based on a first-order approximation of the ray transfer in an optical system, which allows us to derive a matrix that maps lens-flare-producing light rays directly to the sensor. The resulting approach is easy to implement and produces physically-plausible images at high framerates on standard off-the-shelf graphics hardware.
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@ARTICLE{lee13:matrixflare, title={{Practical Real-Time Lens-Flare Rendering}}, author={Sungkil Lee and Elmar Eisemann}, journal={{Computer Graphics Forum (Proc. EGSR'13)}}, volume={32}, number={4}, pages={1--6}, year={2013} }

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