Watermark insertion process in image

1. What is watermarking in image processing?
2. How is the watermark applied?
3. What is watermark extraction process?

What is watermarking in image processing?

Digital image watermarking is a technique in which watermark data is embedded into a multimedia product and, later, is extracted from or detected in the watermarked product. These methods ensure tamper-resistance, authentication, content verification, and integration of the image [1].

How is the watermark applied?

On the Design tab, select Watermark. Choose a pre-configured watermark, like DRAFT, CONFIDENTIAL, or DO NOT COPY. For placing a logo or image, Select Watermark > Custom Watermark > Picture watermark > Select Picture. On the same menu you can create a custom text watermark.

What is watermark extraction process?

The watermark extraction procedure is the direct reversal of the watermark embedding procedure. The watermarked encrypted image is decomposed using the same wavelet transform used in the embedding process, which means that the higher three sub-bands are processed to extract the frequency domain watermark.