To achieve high compression rates HEVC tries to match the block structure according to the object shape through a recursive partitioning process which exponentially increases the motion search complexity as it has to be performed for every block partitioning.
3) An Approximation-Aware Cache Management Unit (Section 4.3) that classifies a cache set as reliable (i.e. this set needs to be stored with reliability) or ‘unreliable’ (i.e. this set does no necessarily require reliability and can tolerate approximation errors). 