IEEE Trans Image Process - Efficient reversible watermarking based on adaptive prediction-error expansion and pixel selection.

Tópicos

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Resumo

Prediction-error expansion (PEE) is an important technique of reversible watermarking which can embed large payloads into digital images with low distortion. In this paper, the PEE technique is further investigated and an efficient reversible watermarking scheme is proposed, by incorporating in PEE two new strategies, namely, adaptive embedding and pixel selection. Unlike conventional PEE which embeds data uniformly, we propose to adaptively embed 1 or 2 bits into expandable pixel according to the local complexity. This avoids expanding pixels with large prediction-errors, and thus, it reduces embedding impact by decreasing the maximum modification to pixel values. Meanwhile, adaptive PEE allows very large payload in a single embedding pass, and it improves the capacity limit of conventional PEE. We also propose to select pixels of smooth area for data embedding and leave rough pixels unchanged. In this way, compared with conventional PEE, a more sharply distributed prediction-error histogram is obtained and a better visual quality of watermarked image is observed. With these improvements, our method outperforms conventional PEE. Its superiority over other state-of-the-art methods is also demonstrated experimentally.

Resumo Limpo

predictionerror expans pee import techniqu revers watermark can emb larg payload digit imag low distort paper pee techniqu investig effici revers watermark scheme propos incorpor pee two new strategi name adapt embed pixel select unlik convent pee emb data uniform propos adapt emb bit expand pixel accord local complex avoid expand pixel larg predictionerror thus reduc embed impact decreas maximum modif pixel valu meanwhil adapt pee allow larg payload singl embed pass improv capac limit convent pee also propos select pixel smooth area data embed leav rough pixel unchang way compar convent pee sharpli distribut predictionerror histogram obtain better visual qualiti watermark imag observ improv method outperform convent pee superior stateoftheart method also demonstr experiment

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