  High dynamic range (HDR) video rendering from low dynamic range (LDR) videos
where frames are of alternate exposure encounters significant challenges, due
to the exposure change and absence at each time stamp. The exposure change and
absence make existing methods generate flickering HDR results. In this paper,
we propose a novel paradigm to render HDR frames via completing the absent
exposure information, hence the exposure information is complete and
consistent. Our approach involves interpolating neighbor LDR frames in the time
dimension to reconstruct LDR frames for the absent exposures. Combining the
interpolated and given LDR frames, the complete set of exposure information is
available at each time stamp. This benefits the fusing process for HDR results,
reducing noise and ghosting artifacts therefore improving temporal consistency.
Extensive experimental evaluations on standard benchmarks demonstrate that our
method achieves state-of-the-art performance, highlighting the importance of
absent exposure completing in HDR video rendering. The code is available at
https://github.com/cuijiahao666/NECHDR.
