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The EURion constellation and digital watermarks are inserted into banknotes to be detected by scanners, photocopiers and image processing software. However the objective of these techniques is not to detect whether a given banknote is a counterfeit, but to deter amateur counterfeiters from reproducing banknotes by blocking the device or ...
June 2011) (Learn how and when to remove this message) Coded anti-piracy ( CAP ) is an anti- copyright infringement technology which marks each film print of a motion picture with a distinguishing pattern of dots, used as a forensic identifier to identify the source of illegal copies.
Fragile watermarks are commonly used for tamper detection (integrity proof). Modifications to an original work that clearly are noticeable, commonly are not referred to as watermarks, but as generalized barcodes. A digital watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations ...
This image contains digital watermarking or credits in the image itself. Additionally, if this image is a freely licensed image, it is in violation of Wikipedia's image use policy. An effort should be made to replace this image with a non-watermarked alternative. Refer to Wikipedia:Uploading images for instructions.
Void pantographs work by exploiting the limitations and features of copying equipment. A scanner or photocopier will act as a low-pass filter on the original image, blurring edges slightly. It will also not be perfectly aligned with the directions of the document, causing aliasing. Features smaller than the resolution will also not be reproduced.
If the data file to be retrieved is an image, the provider can embed a watermark for protection purposes. The process allows tolerance to some change, while still maintaining an association with the original image file. Researchers have also developed techniques that embed components of the image within the image.