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Method and device for watermarking on stream

A technology for watermarking and data processing, which is applied in digital data for watermarking, watermarking, and watermarking, and can solve problems such as information decoding that does not allow watermarking

Inactive Publication Date: 2008-12-24
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But most current watermarking techniques generate inserted watermarks based on compression parameters (e.g., type of transformation used), thus not allowing subsequent decoding of watermarking information when the video content has undergone transformation

Method used

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  • Method and device for watermarking on stream
  • Method and device for watermarking on stream
  • Method and device for watermarking on stream

Examples

Experimental program
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Embodiment Construction

[0049]The invention relates to a method of watermarking an image or video sequence independent of the compression parameters used to compress said image. Each image in the sequence includes pixels, each of which is associated with at least one brightness value. When adding two blocks of pixels, this means that the value associated with the pixel at coordinate (i,j) in the block is associated with the value associated with the pixel at coordinate (i,j) in the other block add up. When two pixels are subtracted, this means that the value associated with the pixel at coordinate (i,j) in the block is subtracted from the value associated with the pixel at coordinate (i,j) in another block go. Similarly, a coefficient matrix M with the same size can be added to or subtracted from the pixel block, that is, adding or subtract from it the value associated with the pixel at coordinate (i, j) in the block. In general, matrices can be identified using coefficient blocks. More specific...

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Abstract

The invention relates in particular to a streamwise method of watermarking independent of the compression parameters used (for example type of the transform) so as to allow the reading of the watermarking inserted independently of the format of the data received. The watermarking method according to the invention consists in generating a contribution matrix MT1 in the transformation space T1, in projecting it into another domain T2 and in watermarking the data in this domain T2 on the basis of the projected matrix MT1 so as to allow a watermark reader operating in the transformed transformation space T1 to read back the inserted watermarking in the transformation space T2. The contribution matrix MT1 representing the modifications induced on the coefficients in the transformation space T1 by insertion of the watermarking cue in this same domain.

Description

technical background [0001] The present invention relates to an apparatus and method for watermarking, or more specifically, for inserting fingerprints into compressed digital data streams. Background technique [0002] The present invention relates to the general field of watermarking digital data. More specifically, the invention relates to the particular application of watermarking for inserting fingerprints into digital data. Later in the document, the terms "fingerprint" and "watermark" are used interchangeably to designate a digital code inserted into compressed digital data. In order to protect digital content (eg video, audio or 3D data, etc.), it is known to insert a unique fingerprint into each data stream distributed, to identify the person or subject who has authorized the transfer of said content without authorization. Thus, during the promotion of the movie, DVDs watermarked with different fingerprints are delivered to selected persons. In the case of a leak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00H04N19/19H04N19/467H04N19/625H04N19/70
CPCG06T1/0057G06T2201/0052G06T2201/0065H04N5/913
Inventor 菲利普·源塞韦里尼·鲍德利科琳娜·奈特里
Owner THOMSON LICENSING SA