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Recoverable mark for film

A film and marking technology, applied to the components of TV systems, TVs, electrical components, etc., can solve problems such as damage modes

Inactive Publication Date: 2008-10-29
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with markings of any kind, whether visible or invisible, is that a thief could remove or modify the identifying markings
Writing on a VAP destroys the pattern in the same way as scratching off the VAP's writing or applying chemical erasers to the VAP

Method used

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  • Recoverable mark for film
  • Recoverable mark for film
  • Recoverable mark for film

Examples

Experimental program
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Effect test

Embodiment Construction

[0084] In the above, the VAP used to detect modifications has been referred to as modification detection mode. In the following, the concept of modification detection patterns is generalized to include any pattern that has the property that once a pattern has been modified, it is impossible to determine the original form of the pattern without knowing the pattern before the modification. A VAP is an example of such a pattern; a modified watermark for detecting a watermarked image is another example of such a pattern. As can be seen from the above, the modification detection mode can be visible, like a VAP, or invisible, like a watermark used to detect modifications of an image. As already pointed out, a watermark used as a modification detection mode need not carry a message, in fact, the shorter the message, the more durable the watermark is, and for that reason, watermarks with short messages (including those where the message is 1 bit) are especially useful for changing de...

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Abstract

Techniques for making and using recoverable marks for films. The recoverable mark consists of a portion of a film to which a watermark that is imperceptible to viewers of the film has been applied and an original mark that is applied to the portion of the film with the watermark. Application of the original mark to the portion modifies the watermark, and consequently, if the original mark is altered, the modifications to the watermark preserve the original mark. In one application of the technique, the watermark is applied to a digital master of the film, a master analog copy is made from the digital master, and a unique original mark is applied to each of the copies made from the master analog copy.

Description

technical field [0001] The present invention relates generally to protective features in objects such as documents, films, and records derived from digital representations, and in particular to the problem of restoring the original form of the protective markings belonging to the objects after the protective markings have been destroyed or altered. Background technique [0002] The premise of a commercial society is the ability to distinguish genuine items from counterfeit, counterfeit, or stolen items. One way of doing this is to include identification marks on the item showing the authenticity of the item. These marks may be visible or invisible to ordinary observers; a large class of such invisible identifying marks are watermarks. A problem with any type of indicia, whether visible or not, is that a thief may remove or modify the identifying indicia. If the thief is highly skilled, it is no longer possible to determine what the mark is. The loss of marking necessarily...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32
CPCH04N1/32144H04N5/913H04N1/32
Inventor 迈克·A·德伦伯格赵健
Owner THOMSON LICENSING SA
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