Conference article

Real-time Image Based Lighting with Streaming HDR-light Probe Sequences

Saghi Hajisharif
Linköping University, Sweden

Joel Kronander
Linköping University, Sweden

Ehsan Miandji
Linköping University, Sweden

Jonas Unger
Linköping University, Sweden

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Published in: Proceedings of SIGRAD 2012; Interactive Visual Analysis of Data; November 29-30; 2012; Växjö; Sweden

Linköping Electronic Conference Proceedings 81:7, p. 49-58

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Published: 2012-11-20

ISBN: 978-91-7519-723-4

ISSN: 1650-3686 (print), 1650-3740 (online)


We present a framework for shading of virtual objects using high dynamic range (HDR) light probe sequences in real-time. Such images (light probes) are captured using a high resolution HDR camera. In each frame of the HDR video; an optimized CUDA kernel is used to project incident lighting into spherical harmonics in real time. Transfer coefficients are calculated in an offline process. Using precomputed radiance transfer the radiance calculation reduces to a low order dot product between lighting and transfer coefficients. We exploit temporal coherence between frames to further smooth lighting variation over time. Our results show that the framework can achieve the effects of consistent illumination in real-time with flexibility to respond to dynamic changes in the real environment.


I.3.3 [Computer Graphics]: Picture/Image Generation—Image based lighting; pre-computed radiance transfer; high dynamic range video


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