CS 766 Final
Samareh Shahmohammadi
The Camera Response Curve
Often after capturing the image, cameras will apply a proprietary response curve post-capture to make the image look more pleasing.
These curves apply a non-linear mapping from the captured photon energy to what is actually recorded.
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This image shows several response curves that were recovered from commercial cameras by Grossberg and Nayar.
Michael D. Grossberg, and Shree K. Nayar. 2004. Modeling the Space of Camera Response Functions. In IEEE Transactionsd on Pattern Analysis and Machine Intelligence, 1272 – 1282.
Creating High Dynamic Range Radiance Maps
Knowing the limitations of the capturing device, as well as its non-linear output, we want to recover the true irradiance (photon energy) of scene points in what’s called an irradiance map.
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We do this using multiple exposures. They cover a higher range together, and they allow us to recover the camera response curve.
Both are needed to create a high dynamic radiance map.
