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Method and device for inserting data in fixed or animated images

A technology for images and equipment, applied in the field of data insertion, which can solve the problems of inability to remove watermarks, inability to remove watermarks, and limit the possibility of copying

Inactive Publication Date: 2008-02-13
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second category incorporates techniques for inserting imperceptible watermarks containing data that make it possible to identify legitimate copies of works, or encodings that limit the possibility of reproduction
[0005] For an effective watermark insertion technique, the watermark must not be removed from the content without causing substantial damage to the image quality
In particular, watermarks must never be removed by combining multiple copies of the same content

Method used

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  • Method and device for inserting data in fixed or animated images
  • Method and device for inserting data in fixed or animated images
  • Method and device for inserting data in fixed or animated images

Examples

Experimental program
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Embodiment Construction

[0040] The invention is based on the use of the spectral form (without modulation) of a baseband digital image or image sequence as shown in FIG. 1 . In this figure, it can be noticed that the spectrum of the image sequence can be distributed in multiple line groups separated by the image frequency, each line group at the line frequency f of the image line (line) H multiplier n.f H has maximum energy. Therefore, two consecutive maximum energies at line frequency f H (H means horizontal) separated.

[0041] The present invention proposes to use the corresponding line frequency f H The spectral spacing between energy peaks of multiples of , in which to interpolate the data forming the marker. It is also conceivable to interpolate data between lines spaced apart by image frequency.

[0042] Fig. 2 shows a device according to the invention for inserting markers into an image or a sequence of images. The device comprises a module 1 for extracting image parameters generating a...

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Abstract

The invention concerns a method for inserting data comprising a predetermined number of symbols, in a sequence of images of at least one image comprising a predetermined number of lines including each a predetermined number of pixels, said method consisting in: generating a set of functions presenting a comb-like spectrum intercalated in the spectrum of the image sequence, and including a respective function for each symbol of the data to be inserted; offsetting each function of the set of functions by a value representing a respective symbol of the data to be inserted; superimposing the offset functions; and combining the pixels of the sequence of images with the result obtained by the superimposition of the offset functions.

Description

technical field [0001] The present invention relates to the insertion of data in stationary or moving images. [0002] The invention applies in particular, but not exclusively, to creating and inserting watermarks in images or sequences of images, inserting data for the purpose of indexing images of a sequence, or scrambling video images. In applications where watermarking and indexing images are inserted, the inserted information must be imperceptible. On the contrary, in the application of image scrambling, the insertion must have a relatively large adverse effect on the quality of the image. Background technique [0003] Technology for digitizing content such as fixed images or moving images can produce copies of the content without limiting the quantity and without compromising quality. At the same time, the development of computer networks and personal computers has allowed the uncontrolled spread of this content. Therefore, it is becoming increasingly difficult to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N19/00H04N19/196H04N19/467H04N19/70H04N19/88
CPCH04N21/23892
Inventor 斯特凡·马德朗热
Owner ADENTIS