Research Article
Optimized Sample Adaptive Offset Filter in HEVC
Table 4
BD degradation: HM 16.20 + SCM 8.8 vs. proposed system.
| HM 16.20 + SCM 8.8 | Test set | AI | RA | LDB | LDP |
| Class A (4K × 2K) | Traffic | 1.2 | 1.3 | — | — | People on street | 1.3 | 2.2 | — | — |
| Class B (1080P) | Cactus | 0.6 | 2.5 | 2.7 | 10.2 | Park scene | 0.6 | 0.9 | 1.6 | 9 | Basketball drive | 0.3 | 1.5 | 1.3 | 8 |
| Class C (WVGA) | Party scene | 0.3 | −0.2 | 0.7 | 4.3 | BasketballDrill | 1.2 | 1.6 | 2.7 | 6.2 |
| Class D (WQVGA) | Blowing bubbles | 0.3 | −0.6 | 0 | 2.8 | BasketballPass | 0.5 | 0.8 | 1.3 | 4.9 |
| Class E (720P) | Kristena and Sara | 0.8 | — | 2.4 | 11 | Johnny | 0.5 | — | 1.8 | 13.4 | Four people | 0.8 | — | 2.5 | 8.9 |
| Class F | Slide show | 1.7 | 1.8 | 6.1 | 12.5 | BasketballDrill text | 1.4 | 3 | 3.7 | 22.5 |
| Proposed system | Class A (4K × 2K) | Traffic | 0.1 | 0 | — | — | People on street | 0.2 | 0.3 | — | — |
| Class B (1080P) | Cactus | 0.2 | 0.2 | 0.4 | 2.1 | Park scene | 0.2 | 0.1 | 0.4 | 1.2 | Basketball drive | 0.3 | 0.4 | 0.3 | 1.5 |
| Class C (WVGA) | Party scene | 0.2 | −0.4 | 0.5 | 1 | BasketballDrill | 0.3 | 0.4 | 0.7 | 1.6 |
| Class D (WQVGA) | Blowing bubbles | 0.1 | −0.1 | 0.1 | 0.6 | BasketballPass | 0.1 | 0.2 | 0.7 | 0.9 |
| Class E (720P) | Kristen and Sara | 0.2 | — | 0.1 | 0.4 | Johnny | 0.1 | — | 0.1 | 0.7 | Four people | 0.2 | — | 0.1 | 0.3 |
| Class F | Slide show | 2.1 | 1 | 1.4 | 0.3 | BasketballDrill text | 0.4 | 1.3 | 2.1 | 1 |
| Summary | Test set | HM 16.20 + SCM 8.8 | AI | RA | LDB | LDP | Class A | 1.1 | 1.65 | — | — | Class B | 0.46 | 1.56 | 1.8 | 9.5 | Class C | 0.65 | 0.8 | 1.7 | 5.2 | Class D | 0.25 | −0.05 | 0.55 | 3.7 | Class E | 0.55 | — | 2.15 | 11 | Class F | 1.5 | 1.95 | 5.1 | 17.85 | | Proposed system | Class A | 0.3 | 0.3 | — | — | Class B | 0.3 | 0.35 | 0.75 | 1.7 | Class C | 0.4 | 0.05 | 0.85 | 1.6 | Class D | 0.2 | 0.15 | 0.6 | 1.05 | Class E | 0.3 | — | 0.15 | 0.7 | Class F | 1.45 | 1.4 | 2.05 | 0.9 |
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