Abstract
We propose to watermark images based on wavelet filter banks by encoding the watermark bits into the choice of the filters, in contrast to the conventional watermarking schemes. Such filters are selected from different classes in such a way that they lead to sufficiently distinguishing sub-bands upon different sequence of filters. A partial sorting on a chosen sub-band to mark the watermark existence is developed to better camouflage the watermark and to fend off certain noise injection attacks. The selection strategy of the sub-band coefficients for the partial sorting can be user defined and aims to achieve better imperception in the selected band. The watermark detection thus hinges on measuring the deviation of sorted coefficients specifically scattered in a targeted sub-band. Experiments conducted on still images and video frames show that the proposed scheme is robust to both noises and illumination changes.
Original language | English |
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Number of pages | 5 |
Journal | Chinese Journal of Electronics |
Publication status | Published - 2008 |
Keywords
- digital images
- filters
- noise
- watermarking
- wavelets (mathematics)