Table 2 Watermark imperceptibility assessment in use of several image quality metrics
From: Performance analysis and improvement of dither modulation under the composite attacks
Metrics | DM | DC-DM | Oostveen's | RDM | NDM | IM-NDM |
|---|---|---|---|---|---|---|
wPSNR (dB) | 42.63 | 42.62 | 42.91 | 42.58 | 42.98 | 42.97 |
TPE | 0.035 | 0.035 | 0.032 | 0.041 | 0.032 | 0.032 |
NLPE1 | 8.50 | 8.65 | 7.50 | 9.87 | 6.70 | 6.83 |
NLPE2 | 4.63 | 4.55 | 4.30 | 6.53 | 3.58 | 3.60 |