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Joseph Zaehnsdorf - AbeBooks

Hybrid secure and robust image watermarking scheme based on SVD and sharp frequency localized contourlet transform - ScienceDirect

A blind CT and DCT based robust color image watermarking method

Robust deep image-watermarking method by a modified Siamese network

Robust watermarking using diffusion of logo into auto-encoder feature maps

Robust location-secured high-definition image watermarking based on key-point detection and deep learning - ScienceDirect

gd - Add a logo water mark diagonally to an image using PHP - Stack Overflow

Remote Sensing, Free Full-Text

PHP: Adding watermarks to images using alpha channels - Manual

Robust watermarking using diffusion of logo into auto-encoder feature maps

How to add a watermark to your image uploads using PHP + source

How To Create A Watermark Image Using PHP GD Library (Part 2), by Emmanuel Okolie

Adding Watermark to an Image in PHP using GD Library Tutorial DEMO