Capacity and reliability of digital watermarking

In watermarking schemes an image is considered as a communication channel for transmitting messages. But because of the requirements of watermarking robustness and visibility, watermarking schemes have different characteristics from traditional communication. Watermarking capacity should be associated with the content of an image. A different image has a different watermarking capacity. In this paper, we present a content adaptive watermarking algorithm to embed the strongest watermark while maintaining the watermark's invisibility, and discuss watermarking capacity for this scenario. We also derive the relation between watermarking capacity and detection bit error rate (BER) for the first time.