| 1. |
- Unger, Jonas, 1978-, et al.
(författare)
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An optical system for single image environment maps
- 2007
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Ingår i: SIGGRAPH '07 ACM SIGGRAPH 2007 posters. - : ACM Press.
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Konferensbidrag (refereegranskat)abstract
- We present an optical setup for capturing a full 360° environment map in a single image snapshot. The setup, which can be used with any camera device, consists of a curved mirror swept around a negative lens, and is suitable for capturing environment maps and light probes. The setup achieves good sampling density and uniformity for all directions in the environment.
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| 2. |
- Unger, Jonas, 1978-, et al.
(författare)
-
Densely Sampled Light Probe Sequences for Spatially Variant Image Based Lighting
- 2006
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Ingår i: The 4th International Conference on Computer Graphics and Interactive Techniques in Australasia and South East Asia, 2006 Kuala Lumpur, Malaysia. - New York, NY, USA : ACM. - 1595935649 ; , s. 341-347
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Konferensbidrag (refereegranskat)abstract
- We present a novel technique for capturing spatially and temporally resolved light probe sequences, and using them for rendering. For this purpose we have designed and built a Real Time Light Probe; a catadioptric imaging system that can capture the full dynamic range of the lighting incident at each point in space at video frame rates, while being moved through a scene. The Real Time Light Probe uses a digital imaging system which we have programmed to capture high quality, photometrically accurate color images with a dynamic range of 10,000,000:1 at 25 frames per second. By tracking the position and orientation of the light probe, it is possible to transform each light probe into a common frame of reference in world coordinates, and map each point in space along the path of motion to a particular frame in the light probe sequence. We demonstrate our technique by rendering synthetic objects illuminated by complex real world lighting, using both traditional image based lighting methods with temporally varying light probe illumination and an extension to handle spatially varying lighting conditions across large objects.
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| 3. |
- Unger, Jonas, 1978-, et al.
(författare)
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Free Form Incident Light Fields
- 2008
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Ingår i: Computer graphics forum (Print). - : Wiley InterScience. - 0167-7055 .- 1467-8659. ; 27:4, s. 1293-1301
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents methods for photo-realistic rendering using strongly spatially variant illumination captured from real scenes. The illumination is captured along arbitrary paths in space using a high dynamic range, HDR, video camera system with position tracking. Light samples are rearranged into 4-D incident light fields (ILF) suitable for direct use as illumination in renderings. Analysis of the captured data allows for estimation of the shape, position and spatial and angular properties of light sources in the scene. The estimated light sources can be extracted from the large 4D data set and handled separately to render scenes more efficiently and with higher quality. The ILF lighting can also be edited for detailed artistic control.
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| 4. |
- Unger, Jonas, 1978-, et al.
(författare)
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High Dynamic Range Video for Photometric Measurement of Illumination
- 2007
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Ingår i: Sensors, Cameras, and Systems for Scientific/Industrial Applications VIII. - Bellingham, Washington/Springfield, Virginia, USA : SPIE—The International Society for Optical Engineering & IS&T—The Society for Imaging Science and Technology. - 9780819466143 ; , s. 65010E-1-65010E-10
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Konferensbidrag (refereegranskat)abstract
- We describe the design and implementation of a high dynamic range (HDR) imaging system capable of capturing RGB color images with a dynamic range of 10,000,000 : 1 at 25 frames per second. We use a highly programmable camera unit with high throughput A/D conversion, data processing and data output. HDR acquisition is performed by multiple exposures in a continuous rolling shutter progression over the sensor. All the different exposures for one particular row of pixels are acquired head to tail within the frame time, which means that the time disparity between exposures is minimal, the entire frame time can be used for light integration and the longest expo- sure is almost the entire frame time. The system is highly configurable, and trade-offs are possible between dynamic range, precision, number of exposures, image resolution and frame rate.
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| 5. |
- Unger, Jonas, 1978-, et al.
(författare)
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Spatially Varying Image Based Lighting by Light Probe Sequences, Capture, Processing and Rendering
- 2007
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Ingår i: The Visual Computer. - : Springer Link. - 0178-2789 .- 1432-2315. ; 23:7, s. 453-465
-
Tidskriftsartikel (refereegranskat)abstract
- We present a novel technique for capturing spatially or temporally resolved light probe sequences, and using them for image based lighting. For this purpose we have designed and built a real-time light probe, a catadioptric imaging system that can capture the full dynamic range of the lighting incident at each point in space at video frame rates, while being moved through a scene. The real-time light probe uses a digital imaging system which we have programmed to capture high quality, photometrically accurate color images of 512×512 pixels with a dynamic range of 10000000:1 at 25 frames per second.By tracking the position and orientation of the light probe, it is possible to transform each light probe into a common frame of reference in world coordinates, and map each point and direction in space along the path of motion to a particular frame and pixel in the light probe sequence. We demonstrate our technique by rendering synthetic objects illuminated by complex real world lighting, first by using traditional image based lighting methods and temporally varying light probe illumination, and second an extension to handle spatially varying lighting conditions across large objects and object motion along an extended path.
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