Fig. 5
From: HEVC double compression detection under different bitrates based on TU partition type
The average number of each TU partition type in the first I/P frame of all GOPs of single (200 k) and double (100 k–200 k) compressed videos. ‘200k_I’ (‘200k_P’) means I (P) frame of a single compressed video with bitrate 200 k. ‘100_200k_I’ (‘100_200k_P’) means I (P) frame of a double compressed video with bitrate 100 k in the first compression process and 200 k in the second compression process. The video for testing is the first part of video named “akiyo” in QCIF database. Information on video database can be found in Section 4