Adaptive block sized reversible watermarking scheme based on integer transform

We propose a new reversible image watermarking scheme using adaptive embedding with block varying. Reversible watermarking scheme provides the possibility of recovering original image after watermark extraction process achieve without any distortion. The developed scheme divides an image into blocks of size 2^k×2^k, and applies 2D-difference expansion method via integer wavelet transform. The watermark insertion process is adaptive to each block owing to the degree of distortion induced by this modification. The selection of block useful for embedding is applied by an optimized algorithm by considering Particle Swarm Optimization-PSO to determine the best threshold that can't exceed distortion. For more precision, we have modulated the size of selected block and conclude the best one which maximizes our algorithm performances.