From: Bitrate control using a heuristic spatial resolution adjustment for a real-time H.264/AVC encoder
Measurement tools | Rate control methods | 1280 × 720 | 1920 × 1072 | 704 × 576 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  | Target bitrate (kbps) | ||||||||||||
 |  | 250 | 400 | 600 | 800 | 1000 | 400 | 800 | 1500 | 2000 | 150 | 300 | 400 | 1000 |
PSNR (Y) | Conventional | 29.14 | 30.88 | 30.49 | 32.53 | 33.75 | 19.56 | 26.99 | 29.75 | 30.90 | 23.11 | 27.43 | 27.20 | 30.25 |
 | Proposed | 30.14 | 31.08 | 32.35 | 33.74 | 34.57 | 31.70 | 33.55 | 35.36 | 36.11 | 25.40 | 27.20 | 27.97 | 30.70 |
 | Optimal | 30.36 | 31.54 | 32.74 | 33.88 | 34.68 | 32.07 | 33.90 | 35.75 | 36.57 | 25.78 | 27.45 | 27.99 | 31.06 |
 | Difference(Full, Proposed) | 1 | 0.2 | 1.85 | 1.21 | 0.82 | 12.15 | 6.56 | 5.60 | 5.20 | 2.29 | -0.24 | 0.77 | 0.45 |
 | Difference(Optimal, Proposed) | 0.22 | 0.46 | 0.39 | 0.14 | 0.12 | 0.37 | 0.35 | 0.39 | 0.46 | 0.39 | 0.25 | 0.02 | 0.37 |
VQM (Y) | Conventional | 7.78 | 4.45 | 2.65 | 2.04 | 1.8 | 9.61 | 5.46 | 2.82 | 2.45 | 7.32 | 4.99 | 2.94 | 2.16 |
 | Proposed | 2.63 | 2.36 | 2.13 | 1.81 | 1.68 | 2.82 | 2.20 | 1.78 | 1.59 | 3.50 | 2.89 | 2.76 | 2.02 |
 | Optimal | 2.65 | 2.35 | 2.07 | 1.84 | 1.68 | 2.63 | 2.11 | 1.65 | 1.50 | 3.46 | 2.82 | 2.75 | 2.00 |
 | Difference(Full, Proposed) | 5.15 | 2.09 | 0.51 | 0.23 | 0.12 | 6.79 | 3.26 | 1.04 | 0.86 | 3.82 | 2.10 | 0.18 | 0.14 |
 | Difference(Optimal, Proposed) | -0.02 | 0.01 | 0.06 | -0.03 | 0 | 0.19 | 0.09 | 0.13 | 0.10 | 0.04 | 0.07 | 0.02 | 0.02 |