Table 14 Comparison between our watermarking method Ramanjaneyulu and Rajarajeswari’s scheme [[24]] and Tang and Hang’s scheme [[25]]

Median filtering 3 × 3

0.7466

0.125

0.3328

Gaussian filter 3 × 3

0.8055

0.625

0.7262

Salt and Pepper noise (scale = 0.1)

N/A

0.625

0.7693

JPEG 60

0.9983

0.75

0.9963

JPEG 40

0.7880

0.375

0.9145

Median filtering 3 × 3 + JPEG 90

N/A

0.125

0.8865

Gaussian filtering 3 × 3 + JPEG 90

N/A

0.625

0.5498

Histogram equalization

0.0192

N/A

1