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Table 2 Bit error rate (BER) values of the extracted watermarks obtained for the JPEG compression attacks for various values of the quality factor (QF), and at each DWT level .

From: Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication

Example: Lena image

QF

90%

0

0.0728

0.4587

80%

0.0068

0.1880

0.4802

70%

0.0313

0.2847

0.4832

60%

0.0781

0.3413

0.5034

50%

0.1357

0.4214

0.4995

40%

0.2168

0.4634

0.4978