A combination of photographic filter placed over the lens and the color filter array on image sensor induces differences in red, green, and blue channel sensitivities. Spectrally selective single-shot HDR (S4HDR) imaging treats this as an exposure bracketing. Optimally exposed regions of low dynamic range red/green/blue color components are merged in a principled manner to yield a single HDR color image. Though not expected to yield results superior to the traditional time multiplexing counterparts, the single-shot HDR solution we propose is a robust alternative that can be realized with conventional camera hardware.
Keigo Hirakawa, Paul M. Simon, “Single-Shot High Dynamic Range Imaging with Conventional Camera Hardware,” ICCV, 2011. [bibtex][pdf]