Digital Image Watermarking

A digital watermark is a kind of marker covertly embedded in digital image data. It is used to identify ownership of the copyright of such file, in order to avoid unwanted distribution especially via Internet.

Digital watermarks can be visible (and thus degrade image’s legibility), and they are applied to images with broad audience (i.e. in a web site or a digital repository accessed by public). They are easy to apply and are intended to get easily recognized by humans.

Invisible (blind) digital watermarks ―like traditional watermarks― are only perceptible under certain conditions, i.e. after using some algorithm, and imperceptible otherwise. For marking media files with copyright information, a digital watermark has to be rather robust against modifications that can be applied to the file, even harsh ones.

Realiscape Typorama can apply both types of watermarks in all of the image files it digitizes. Especially for invisible watermarks, it cooperates with academic research institutes using especially developed and continuously updated software that watermarks the files, and analyses not only the security of the outcome, but also the alteration level that watermarking bears to the original file in order to verify that it always remain under a perceivable level.