A Wavelet-based Adaptive Image Watermarking Using Edge Table

Rhee， Jay Hyuk; Hoseok Moon; Park Sangsung; JANG， Dong Sik

Journal of The Korea Society of Computer and Information

Abbr : JKSCI
2006, 11(2), pp.53-64
Publisher : The Korean Society Of Computer And Information
Research Area : Computer Science

Rhee， Jay Hyuk ¹, Hoseok Moon ², Park Sangsung ³, JANG， Dong Sik ⁴

¹고려대학교
²육군사관학교
³고려대학교
⁴고려대학교

ABSTRACT

A discrete wavelet transform(DWT)-based image watermarking algoritmm is proposed in this paper. the proposed method decompose the original image into four subsampled images. Subsampled images are transformed by 2 level DWT, respectivelty. The proposed method embeds the watermark into one of the subsampled DWT images using edge table that represents dege chracteristics of the original image. Without an original image, a watermark is extracted through comparison one subsampled DWT image inserted the watermark with the rest of the submapled DWT images. many exiting methodes do not adequately estimate edge regions where intensities are changed abruptly. The proposed method address with an edge table. Also, even if the watermark is embedded into a low frequency area, our method preserves the image quality. The vality of the proposed method is demonstrated through the PSNR test and subjective image quality that human eyes feel.
KEYWORDS

웨이블릿 변환(Discrete Wavelet Transform(DWT)), 디지털 워터마킹(Digital Watermarking), 에지 테이블(Edge Table).
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