Toward Quality Improvement in Location Map Free Reversible Watermarking

Authors:
Ahmad Mahmoudi Aznaveh;Farah Torkamani-Azar;Azadeh Mansouri
Affiliations:
Department of Electrical and Computer Engineering, Shahid Beheshti University, Tehran, Iran;Department of Electrical and Computer Engineering, Shahid Beheshti University, Tehran, Iran;Department of Electrical and Computer Engineering, Shahid Beheshti University, Tehran, Iran
Venue:
PCM '09 Proceedings of the 10th Pacific Rim Conference on Multimedia: Advances in Multimedia Information Processing
Year:
2009

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Abstract

In most of reversible watermarking methods, a compressed location map is exploited in order to ensure reversibility. However, some reversible watermarking algorithms have been proposed in which a compressed location map has not utilized. In such methods, the large size of auxiliary data will cause an impressive degradation especially when the distortion control mechanism is applied. Consequently, most of reversible watermarking schemes proposed so far cannot embed low capacity of data with an acceptable quality, since the most fraction of the selected capacity is occupied by auxiliary data (location map or correction data). In this paper, we propose a new scheme in which using a compressed location map is removed. In addition, the amount of auxiliary data is decreased. Therefore, the quality of the marked images is improved especially for low embedding rate.