I'm doing research on image and audio watermarking, and so far I've read some literature in order to get basic introduction and good initial understanding of this topic. Right now I'm reading book "Digital Watermarking and Steganography" by Cox, et al.
My basic goal is to get know with robust watermarking techniques, especially for medical image marking.
If we look at the types of algorithms, some of the most commonly used (and robust) are Cox, Corvi and Xia algorithm, but all of them rely on watermarks generated as Gauss series of N pseudo-random numbers.
My question is, what if we want to embed custom watermark, like patient information (patient name, date of scan/record, etc.), or to use custom watermark as proof of ownership? Which (robust) algorithms and approaches are used in that case?
Thanks in advance.