High Capacity Reversible Data Hiding Using IWT

This paper presents a novel loss less data hiding scheme for digital images using integer wavelet transform and threshold embedding technique. Data are embedded into the least two significant bit-plane (LSB) of high frequency CDF (2,2) integer wavelet coefficients whose magnitudes are smaller than a certain predefined threshold. Histogram modification is applied as a preprocessing to prevent overflow/underflow. Experimental results show that this scheme outperforms the prior arts in terms of a higher payload and better PSNR with efficient computations.