Home	Publications

High Dynamic Range Video Imaging
A Real Time Light Probe
 

Traditional HDR imaging methods are based on capturing several exposures where the exposure settings are varied to cover the full dynamic range of the scene. Using commercially available camera systems such multiple exposure methods make it impractical to capture more than a few HDR images in a scene. Therefore, we have designed a high dynamic range imaging system capable of capturing images with a dynamic range of 1:10,000,000 at 25 frames per second.
Using our HDR video camera we can capture arbitrary long series of photometrically correct light samples with correct data of both the sun and indoor scenes simultaneously. By tracking the light probe motion in the scene we can, using Image Based Lighting techniques, render images with synthetic objects that move through detailed and changing real world lighting environments.
 
The latest results from our work in High Dynamic Range video (HDRv) are displayed at www.hdrv.org. Example HDRv sequences and image based lighting renderings for VFX applications are presented in the video below.
 

Older results can be found below.
 
Examples
 

	A short sequence of HDR light probes captured at Campus Norrköping with our camera setup. The HDR images captures both the direct view of the sun and indoor environment simultaneously, and are displayed as six different exposures in order to show the dynamic range in the scene. [Exposures-Corridor.mov](10.2MB)
	A short sequence of HDR light probes captured in Linköping Castle with our camera setup. As seen in the sphere reflection, the camera and light probe are mounted onto a translation stage with position tracking. The HDR images are displayed as six different exposures in order to show the dynamic range in the scene. [Exposures-Castle.mov])(11.8MB)
	A short sequence of HDR light probes captured in a conference room environemnt at Linköping University, Sweden. The scene contains illumination through the windows, from the lights in the ceiling and a high intensity spot-light. The (originally) spherical images are re-mapped to longitude latitude format, and displayed as four different exposures.   [Exposures-ConfRoom.mov])(3.9MB)
[Indoor capture f=2.8 (.avi)] [Indoor capture f=4.0 (.avi)] [Indoor capture f=8.0 (.avi)]	Three example videos showing HDR light probe sequences captured inside our imaging lab. The sequences are false colored in order to show the dynamic range in the captured illumination.(DivX)

 
Related Papers
Spatially Varying Image Based Lighting by Light Probe Sequences (web) (Visual Computer 2007)
Single Image Environment Maps (web) (SIGGRAPH '07 Poster)
High Dynamic Range Video for Photometric Measurement of Illumination (.pdf) (EI 2007)
A Real Time Light Probe (.pdf) (Eurographics 2004)