Metering for Exposure Stacks
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"Metering for Exposure Stacks" Orazio Gallo (NVIDIA), Marius Tico (Nokia Research Center), Roberto Manduchi (UC Santa Cruz), Natasha Gelfand (Nokia Research Center), Kari Pulli (NVIDIA), in Eurographics 2012, May 2012 |
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| Research Area: | Imaging | ||
| Author(s): | Orazio Gallo (NVIDIA), Marius Tico (Nokia Research Center), Roberto Manduchi (UC Santa Cruz), Natasha Gelfand (Nokia Research Center), Kari Pulli (NVIDIA) | ||
| Date: | May 2012 | ||
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| Abstract: |
When creating a High-Dynamic-Range (HDR) image from a sequence of differently exposed Low-Dynamic-Range (LDR) images, the set of LDR images is usually generated by sampling the space of exposure times with a geometric progression and without explicitly accounting for the distribution of irradiance values of the scene. We argue that this choice can produce sub-optimal results both in terms of the number of acquired pictures and the quality of the resulting HDR image. This paper presents a method to estimate the full irradiance histogram of a scene, and a strategy to select the set of exposures that need to be acquired. Our selection usually requires a smaller or equal set of LDRs, yet produces higher quality HDR images.
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