Video Watermarking Papers

But it would also be hidden as an invisible watermark in the passport photo.If anyone tries to tamper with the passport by replacing the photo, it would be possible to detect the change by scanning the passport and verifying the name hidden in the photo.Digital Watermarking describes methods and technologies that hide information, for example a number or text, in digital media, such as images, video or audio.The embedding takes place by manipulating the content of the digital data, which means the information is not embedded in the frame around the data.Furthermore, the watermark must be either robust or fragile, depending on the application.By "robust", we mean the capability of the watermark to resist manipulations of the media, such as lossy compression (where compressing data and then decompressing it retrieves data that may well be different from the original, but is close enough to be useful in some way), scaling, and cropping, among others.

For instance, the name of a passport owner is normally printed in clear text.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.Alp Vision's founders contributed significantly to the scientific development of the Digital Watermarking technology in the late 90's (see Publications).To some extent, Alp Vision's proprietary digital security technologies derive from the Digital Watermarking scientific background, although they are, in essence, extremely different (see Cryptoglyph or Fingerprint).The picture on the left shows a printing machine from Intercard for various types of plastic cards (Courtesy of Intercard, Switzerland).Another application is the authentication of image content.Therefore, switching or manipulating the identity photo will be detected.Digital watermarking also allows to link information on documents.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.

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  1. The South, until it is truly and finally con­quered and reconstructed, will always be the “New Fron­tier.” More surprising in this connection, perhaps, is the contrast Mencken goes on to present between the Northern and Southern people today.