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A Study on Wavelet Based Watermarking using Human visual system property  

노상윤 (삼성전자, 디지털미디어 네트워크총괄)
박상주 (홍익대학교 전자전기공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.27, no.4A, 2002 , pp. 336-344 More about this Journal
Abstract
Recently, aegis of authentication and creator's copyright has become a matter of great concern by the diffusion of multimedia technique and the growth of the internet and the easily duplicated property of digital data. Consequently, many active researches have been made to protect copyright and to assure integrity by inserting watermark into the digital data. In this paper, watermark is repeated through the entire image and adapted to the content of the image. It is achieved by an underlying process of transforming the digital image to the frequency domain by wavelet transform, which has three (vertical, horizontal, diagonal) directions and Multi-resolution features, and then choosing frequency area inferior to the human perceptibility, and significant for invisible and robust watermark. Watermark is inserted by utilizing Human Visual System (HVS) feature in the wavelet transformed frequency domain. Especially, watermark inserted into the high frequency concentrated textual area makes itself invisible.
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Times Cited By KSCI : 2  (Citation Analysis)
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