A background image which consist of raster elements or strokes forming a pattern. When copying/scanning a document, text ("COPY", "VOID", etc.) invisible to the naked eye appears on copies or moire appears as rainbow lines, bright and dark stripes, and spots, etc.

The EURion constellation (also known as Omron rings[1] or doughnuts[2]) is a pattern of symbols incorporated into a number of secure documents such as banknotes, cheques, and ownership title certificate designs worldwide since about 1996.

A copy detection pattern (CDP)[1] or graphical code[2][3] is a small random or pseudo-random digital image which is printed on documents, labels or products for counterfeit detection. Authentication is made by scanning the printed CDP using an …

An image constructed of parallel and multidirectional fine lines or raster units. The pattern parameters (direction, width of strokes and the distance among them) impedes reproduction of the images by copying equipment which can be seen as moire or a darker (lighter) text compared with the background (fig. 1, fig. 2).

Jun 22, 2016 · When a scanner spots the pattern, it stops. But there's also a newer and even more secretive system called the Counterfeit Deterrent System, and it's so effective that photo …

Jun 14, 2017 · An anti-scan pattern is an image made of fine lines at varying angular displacement in the background design of the passport paper. This security feature is not visible to the naked eye.

Jun 1, 2022 · The performance of any document protection system based on the use of anti-copy elements, whether in the form of a PTS or CSGC, is dependent on in-depth knowledge of the print-scan chain involved.

Visible anti-copy patterns provide a solution to distinguish copied documents from original ones through naked eyes. In order to generate visible anti-copy patterns, this research examines characteristics of digital image input and output devices.

Aug 14, 2009 · The printed images and patterns contain embedded (hidden) information that is invisible to the naked eye under normal inspection conditions but becomes visible or legible, or causes flaws (mistakes) to appear after copying or reproduction with a scanner.

Classify AI text from major AI models, from ChatGPT to Gemini, Llama, Claude and more. Independent benchmarking shows GPTZero Advanced Scan has best-in-class accuracy. Easily integrate with learning management systems including Canvas, Moodle, and Google Classroom. Build responsible writing habits with custom AI-powered writing feedback tools.