Table 2 Comparison of lossless image coding (LBR (bpp))
From: Integer fast lapped transforms based on direct-lifting of DCTs for lossy-to-lossless image coding
Test | 5/3-DWT | HLT | Conventional FLTs | Proposed FLTs | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Images | [14] | [16] | (A) | (B) | (C) | (D) | (E) | (F) | (G) | (H) |
Baboon | 6.25 | 6.23 | 6.24 | 6.24 | 6.23 | 6.24 | 6.23 | 6.22 | 6.22 | 6.22 |
Barbara | 4.97 | 4.96 | 5.00 | 4.95 | 4.95 | 4.93 | 4.95 | 4.85 | 4.90 | 4.83 |
Boat | 5.19 | 5.20 | 5.22 | 5.22 | 5.19 | 5.21 | 5.19 | 5.16 | 5.16 | 5.15 |
Elaine | 5.26 | 5.27 | 5.30 | 5.26 | 5.27 | 5.25 | 5.28 | 5.21 | 5.25 | 5.20 |
Finger | 5.88 | 5.89 | 5.91 | 5.79 | 5.85 | 5.78 | 5.89 | 5.75 | 5.84 | 5.75 |
Finger2 | 5.64 | 5.62 | 5.65 | 5.57 | 5.57 | 5.56 | 5.63 | 5.51 | 5.55 | 5.51 |
Goldhill | 5.08 | 5.12 | 5.21 | 5.20 | 5.17 | 5.19 | 5.18 | 5.15 | 5.15 | 5.14 |
Grass | 6.09 | 6.09 | 6.11 | 6.09 | 6.08 | 6.08 | 6.10 | 6.07 | 6.08 | 6.07 |
Lena | 4.58 | 4.64 | 4.74 | 4.77 | 4.71 | 4.75 | 4.71 | 4.69 | 4.66 | 4.67 |
Pepper | 4.96 | 5.00 | 5.03 | 5.06 | 4.99 | 5.04 | 4.99 | 5.00 | 4.96 | 4.98 |
Avg. | 5.39 | 5.40 | 5.44 | 5.42 | 5.40 | 5.40 | 5.42 | 5.36 | 5.38 | 5.35 |