Very fast watermarking by reversible contrast mapping

Details Very fast watermarking by reversible contrast mapping Very fast watermarking by reversible contrast mapping

2007-07-05

arxiv.org/abs/0707.0802v1

IEEE Signal Processing Letters 14, 4 (04/2007) pp 255-258

Computer Science

Multimedia

Scientific paper

10.1109/LSP.2006.884895

Reversible contrast mapping (RCM) is a simple integer transform that applies to pairs of pixels. For some pairs of pixels, RCM is invertible, even if the least significant bits (LSBs) of the transformed pixels are lost. The data space occupied by the LSBs is suitable for data hiding. The embedded information bit-rates of the proposed spatial domain reversible watermarking scheme are close to the highest bit-rates reported so far. The scheme does not need additional data compression, and, in terms of mathematical complexity, it appears to be the lowest complexity one proposed up to now. A very fast lookup table implementation is proposed. Robustness against cropping can be ensured as well.

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