This isn't HD per se, but thereabouts...
Developed by Swiss CSEM (http://www.csem.ch/) and currently owned by Photonfocus, LinLog is a fairly recent CMOS imaging technology that provides high semi-linear dynamic range, significantly alleviating highlight clipping.
It may also be of interest to note that DALSA is licensing this technology (in their machine vision products).
Photonfocus LinLog technology
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