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Frequency Analysis and Sheared Reconstruction for Rendering Motion Blur
Abstract : Motion blur is crucial for high-quality rendering but is also very expensive. Our first contribution is a frequency analysis of motion-blurred scenes, including moving objects, specular reflections, and shadows. We show that motion induces a shear in the frequency domain, and that the spectrum of moving scenes is usually contained in a wedge. This allows us to compute adaptive space-time sampling rates, to accelerate rendering. For uniform velocities and standard axis-aligned reconstruction, we show that the product of spatial and temporal bandlimits or sampling rates is constant, independent of velocity. Our second contribution is a novel sheared reconstruction filter that tightly packs the wedge of frequencies in the Fourier domain, and enables even lower sampling rates. We present a rendering algorithm that computes a sheared reconstruction filter per pixel, without any intermediate Fourier representation. This often permits synthesis of motion-blurred images with far fewer rendering samples than standard techniques require.
Cited literature [20 references]
https://hal.inria.fr/inria-00388461
Contributor : Nicolas Holzschuch Connect in order to contact the contributor
Submitted on : Tuesday, May 26, 2009 - 5:04:54 PM
Last modification on : Friday, November 5, 2021 - 6:26:08 PM
Long-term archiving on: : Thursday, June 10, 2010 - 11:53:06 PM
Contributor : Nicolas Holzschuch Connect in order to contact the contributor
Submitted on : Tuesday, May 26, 2009 - 5:04:54 PM
Last modification on : Friday, November 5, 2021 - 6:26:08 PM
Long-term archiving on: : Thursday, June 10, 2010 - 11:53:06 PM
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