Improved image watermarking using pixel averaging and unbiased retrieval

Authors:
Thitiporn Pramoun;Thumrongrat Amornraksa
Affiliations:
Multimedia Communication Laboratory, Computer Engineering Department, Faculty of Engineering, King Mongkut's University of Technology Thunburi, Thungkru, Bangkok, Thailand;Multimedia Communication Laboratory, Computer Engineering Department, Faculty of Engineering, King Mongkut's University of Technology Thunburi, Thungkru, Bangkok, Thailand
Venue:
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
Year:
2009

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Abstract

Digital watermarking based on pixels modification for color image [8] is considered in this paper. Its operations are described and its performance is investigated. Based on our observations, a method based on pixel averaging and unbiased watermark retrieval is proposed in order to improve the efficiency of the considering watermarking method. Particularly, we first apply the pixel averaging technique to create the localized luminance component, and used it to fine tune the watermark signal strength. We then remove some biased watermarked pixels in the watermark retrieval process to increase accuracy of the recovered watermark. The experimental results show the watermark retrieval improvements in term of NC, compared to the previous watermarking methods in [8] and [9]. The robustness against different types of attack at various strengths is also evaluated and compared.