In this work, an algorithm was built for embedding text messages into b&w images.
Examples: original vs watermarked (block_size=4, redundancy=3, max_iter=7)
Bit error: 0.0015 (without noise), 0.0079 (with white noise).
More information in my report watermark-svd-report.pdf:
@software{samarin-igor-watermark-svd,
author = {Samarin, I.},
title = {Embedding information in a black and white image},
url = {https://github.com/killerxzol/watermark-svd},
year = {2021}
}