Title :
A multiresolution watermark for digital images
Author :
Xia, Xiang-Gen ; Boncelet, Charles G. ; Arce, Gonzalo R.
Author_Institution :
Dept. of Electr. Eng., Delaware Univ., Newark, DE, USA
Abstract :
We introduce a new multiresolution watermarking method for digital images. The method is based on the discrete wavelet transform (DWT). Pseudo-random codes are added to the large coefficients at the high and middle frequency bands of the DWT of an image. It is shown that this method is more robust to often proposed methods to some common image distortions, such as the wavelet transform based image compression, and image halftoning. Moreover, the method is hierarchical. The computation load needed to detect the watermark depends on the noise level in an image
Keywords :
Gaussian noise; copyright; data compression; discrete cosine transforms; image coding; image resolution; pseudonoise codes; random noise; security of data; transform coding; wavelet transforms; DCT approach; DWT; Gaussian random noise; HF band; coefficients; computation load; copyright protection; digital images; discrete wavelet transform; hierarchical method; image distortions; image halftoning; image noise level; middle frequency band; multiresolution watermarking method; pseudo-random codes; wavelet transform based image compression; Digital images; Discrete wavelet transforms; Electronic publishing; Frequency domain analysis; Image coding; Image resolution; Noise robustness; Spatial resolution; Transform coding; Watermarking;
Conference_Titel :
Image Processing, 1997. Proceedings., International Conference on
Conference_Location :
Santa Barbara, CA
Print_ISBN :
0-8186-8183-7
DOI :
10.1109/ICIP.1997.647971
