What is Always-On HDR and how is it different from other High Dynamic Range solutions in the market?
Always-On HDR is a computationally driven solution built into NVIDIA Tegra 4 processors that has many aspects to it, including a real-time, lag-free version of HDR technology.
Previous HDR solutions take multiple photos of a scene at varying exposure levels, and then take a few seconds to fold together the results into a single photo that highlights the best features in both exposures. This achieves photos that appear the way your eye perceived the original scene. The issue is that any movement during the gaps in-between shots results in motion artifacts in the final photo.
NVIDIA's Always-On HDR, which is built into the Tegra NOTE, simultaneously takes multiple exposures with no time gaps, thus solving the artifact issue. Tegra 4 processes the image so quickly that you can even take bursts of photos or video with HDR without any post-processing delay. By default Always-On HDR is enabled in most photo modes on the Tegra NOTE.