From: Fast intra algorithm based on texture characteristics for 360 videos
 | First level mode set C1 | Second level mode set C2 | Third level mode set C3 |
---|---|---|---|
Horizontal mode | 2–18 | 2, 6, 10, 14, 18 | C2−2, C2−1, C2+1, C2+2 |
Vertical mode | 18–34 | 18, 22, 26, 30, 34 | C2−2, C2−1, C2+1, C2+2 |