Abstract:
Taking multiple exposures is a well-established approach both for capturing high dynamic range (HDR) scenes and for noise reduction. But what is the optimal set of photos...Show MoreMetadata
Abstract:
Taking multiple exposures is a well-established approach both for capturing high dynamic range (HDR) scenes and for noise reduction. But what is the optimal set of photos to capture? The typical approach to HDR capture uses a set of photos with geometrically-spaced exposure times, at a fixed ISO setting (typically ISO 100 or 200). By contrast, we show that the capture sequence with optimal worst-case performance, in general, uses much higher and variable ISO settings, and spends longer capturing the dark parts of the scene. Based on a detailed model of noise, we show that optimal capture can be formulated as a mixed integer programming problem. Compared to typical HDR capture, our method lets us achieve higher worst-case SNR in the same capture time (for some cameras, up to 19 dB improvement in the darkest regions), or much faster capture for the same minimum acceptable level of SNR. Our experiments demonstrate this advantage for both real and synthetic scenes.
Date of Conference: 13-18 June 2010
Date Added to IEEE Xplore: 05 August 2010
ISBN Information:
ISSN Information:
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- IEEE Keywords
- Index Terms
- Dynamic Range ,
- High Dynamic Range ,
- Exposure Time ,
- Denoising ,
- Noise Model ,
- Multiple Exposures ,
- Capture Sequencing ,
- Real Scenes ,
- Capture Time ,
- High SNR ,
- Part Of The Scene ,
- Mixed-integer Programming Problem ,
- Integer Programming Problem ,
- Reference Genome ,
- Digital Camera ,
- Additive Noise ,
- Raw Images ,
- Spectral Power ,
- Analog-to-digital Converter ,
- Optimal Sequence ,
- High Dynamic Range Image ,
- Ideal Sensor ,
- Scene Regions ,
- Number Of Photos ,
- SNR Increases ,
- Time Budget ,
- Electronic Unit ,
- Sensor Noise ,
- Total Exposure Time ,
- Saturated Pixels
Keywords assist with retrieval of results and provide a means to discovering other relevant content. Learn more.
- IEEE Keywords
- Index Terms
- Dynamic Range ,
- High Dynamic Range ,
- Exposure Time ,
- Denoising ,
- Noise Model ,
- Multiple Exposures ,
- Capture Sequencing ,
- Real Scenes ,
- Capture Time ,
- High SNR ,
- Part Of The Scene ,
- Mixed-integer Programming Problem ,
- Integer Programming Problem ,
- Reference Genome ,
- Digital Camera ,
- Additive Noise ,
- Raw Images ,
- Spectral Power ,
- Analog-to-digital Converter ,
- Optimal Sequence ,
- High Dynamic Range Image ,
- Ideal Sensor ,
- Scene Regions ,
- Number Of Photos ,
- SNR Increases ,
- Time Budget ,
- Electronic Unit ,
- Sensor Noise ,
- Total Exposure Time ,
- Saturated Pixels