Actually, Canon’s DGO mode seems very similar to Arri’s. The key ingredient is that the different gain levels are captured simultaneously. Without this ghosting would appear in all but static shots. Which is why Red’s high dynamic range mode is more of a gimmick.ARRI has a patent for that, not sure how generic it is. Canons DGO in video mode seems to be different enough to avoid lawsuits.
It could be that Arri licensed this tech to Canon.
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