Table 2. Results for SS-DWT, RDLS-DWT, RDLS-SS-DWT, and comparison with JPEG-LS and HEVC (lossless mode).
| Compressor variant | Images | ||||
|---|---|---|---|---|---|
| Photo | No-photo | No-photo(a) | No-photo(b) | All | |
| r DWT | 3.9975 | 2.9162 | 3.2882 | 2.7348 | 3.6395 |
| ΔrBH(2) | -0.86% | -15.66% | -32.28% | -7.54% | -5.76% |
| ΔrRDLS(2, 2) | -0.57% | -12.68% | -27.18% | -5.61% | -4.58% |
| ΔrRDLS(5, 2) | -0.64% | -13.29% | -28.45% | -5.89% | -4.83% |
| ΔrRDLS(2, 2), NO-DWT | -0.58% | -14.06% | -31.37% | -5.61% | -5.04% |
| ΔrRDLS(5, 2), NO-DWT | -0.65% | -14.43% | -31.92% | -5.89% | -5.21% |
| ΔrRDLS-SS(3, 2) | -0.86% | -17.20% | -36.36% | -7.85% | -6.27% |
| ΔrRDLS-SS(6, 2) | -0.92% | -17.47% | -36.82% | -8.03% | -6.40% |
| ΔrJPEG-LS | -2.72% | -21.46% | -38.27% | -13.26% | -8.92% |
| ΔrHEVC | 9.32% | -17.04% | -36.48% | -7.55% | 0.59% |
rDWT−average lossless JPEG 2000 bitrate for 3-level unmodified DWT (bpp); Δrvariant_list−average bitrate change obtained using the best out of the listed variants: BH(n)–SS-DWT with step-skip decisions obtained using BH, RDLS(f, n)–RDLS-DWT with denoising filters selected by the H_SS_RDLS heuristic, RDLS_SS(f, n)–RDLS-SS-DWT using H_SS_RDLS, n–number of iterations of step B of the heuristic, f–number of denoising filters, NO-DWT–skipping the DWT stage of JPEG 2000; ΔrJPEG-LS−average bitrate change obtained by using JPEG-LS instead of JPEG 2000; ΔrHEVC−average bitrate change obtained by using HEVC.