Title :
DCT and DWT-based image watermarking by using subsampling
Author :
Tsai, Min-Jen ; Hung, Hsiao-Ying
Author_Institution :
Inst. of Inf. Manage., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A subsampling based watermarking scheme has been investigated for digital images. The algorithm utilizes the wavelet multiresolutional structure and subsamples the individual subband coefficients in order to embed the watermark information respectively. The extracting procedure reverses the embedding operations without the reference of the original image and provides a better copyright protection scheme. Compared with the similar approach by discrete cosine transform based approach, the wavelet based algorithm apparently preserves superior image quality and robustness under various attacks.
Keywords :
discrete cosine transforms; discrete wavelet transforms; image resolution; image sampling; watermarking; DCT-based image watermarking; DWT-based image watermarking; copyright protection; digital images; discrete cosine transform; discrete wavelet transform; image quality; image robustness; individual subband coefficients; subsampling based watermarking; watermark information embedding; wavelet multiresolutional structure; Copyright protection; Data mining; Digital images; Discrete cosine transforms; Discrete wavelet transforms; Image quality; Information management; Internet; Robustness; Watermarking;
Conference_Titel :
Distributed Computing Systems Workshops, 2004. Proceedings. 24th International Conference on
Print_ISBN :
0-7695-2087-1
DOI :
10.1109/ICDCSW.2004.1284029
