Image (c) shows the photo after running the digital watermark detection program on the tampered photo. We can clearly see that the detected area corresponds to the modifications applied to the original photo.Digital watermarks can also be adapted to mark white paper with the goal of authenticating the originator, verify the authenticity of the document content, and date the document.Image (a) shows an original photo of a car that has been protected with a watermarking technology.
For example, in the field of data security, watermarks may be used for certification, authentication, and conditional access.
Certification is an important issue for official documents, such as identity cards or passports.
The example below illustrates how digital watermarking can hide information in a totally invisible way.
The original image is on the left; the watermarked image is on the right and contains the name of the author.
Such applications are especially of interest for official documents, such as contracts.
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For example, the digital watermark can be used to embed the name of the lawyer or other key monetary amounts.
In this scenario, digital watermarking may be useful to set up controlled audio distribution and to provide efficient means for copyright protection, usually in collaboration with international registration bodies.
There are a number of possible applications for digital watermarking technologies and this number is increasing rapidly.
The goal of this application is to detect any alterations and modifications made to an image.
The three pictures below illustrate this application.