Table 2 Subjective listening test results
From: Robust image-in-audio watermarking technique based on DCT-SVD transform
Audio type | DCT based [20] | Proposed technique |
|---|---|---|
|  | Grades | Grades (“mean [ ± standard deviation”]) |
Speech | 4.87 | 4.61 [ ± 0.21] |
Music | – | 4.57 [ ± 0.16] |