Research Laboratory
Digital Image Watermarking Playgrounds
Interactive implementations of canonical digital watermarking algorithms. Experiment with frequency-domain embedding, blind versus non-blind extraction, and channel distortion attacks in the browser.
I. J. Cox, J. Kilian, F. T. Leighton, & T. Shamoon (IEEE IP, 1997)
Secure Spread Spectrum Watermarking
Embeds a continuous Gaussian pseudorandom sequence across perceptually significant frequencies. Robust against heavy filtering and compression, evaluated via normalized correlation detector response against a 6.0 threshold.
Detection:Non-Blind (Host Reference Required)
Domain:Full-Frame 2D DCT (1,000 Largest AC Coefficients)
Open Playground →
B. Chen & G. W. Wornell (IEEE IT, 2001)
Quantization Index Modulation (QIM)
Information embedding based on side information and disjoint quantizer ensembles. Eliminates host interference entirely, supporting keyed dither modulation and distortion-compensated dither modulation (DC-DM).
Detection:Strictly Blind (No Host Reference)
Domain:8x8 Block DCT Mid-Frequency Coefficients
Open Playground →