Capacity and reliability of digital watermarking

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