Fig. 1From: HEVC double compression detection under different bitrates based on TU partition typeExamples of the partitioning of a picture into CTUs (a) and the partitioning of a 64 × 64 coding tree unit (CTU) into coding units (CUs) (b). The partitioning can be illustrated by a quadtree (c), where the numbers indicates the coding order of CUsBack to article page