Sophisticated ways of watermarking an image.

|-------------------------> (6.1) DCT -> Deals with image edits. generating frequency maps, embdding them in QR code, and adding that QR code as watermark will help us detect the "source" even when the image is modified.
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|-------------------------> (6.2) GAN -> Deep neural way of watermarking an image + identifying if an image is watermarked or not + retrieving that watermark?