Secure Spread Spectrum Digital WatermarkingI. J. Cox, J. Kilian, F. T. Leighton, & T. Shamoon (IEEE IP, 1997)
Spread Spectrum Watermarking
Spread-spectrum watermark embedding across perceptually significant 2D DCT frequency coefficients. Evaluated via normalized correlation detector response against 1,000 random candidate keys under channel distortion.
PSNR: 37.17 dB
OriginalWatermarked
Embedding Parameters
0.10
0.05 (subtle)0.30 (heavy)
Channel Distortion Simulator
Detector Output
WATERMARK DETECTED
Score:31.4
Threshold (T)6.0
Extraction ReferenceNon-Blind (Host Reference Required)
Candidate Key Spectrum (1,000 Keys)