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Embedding a watermark in a coded signal

A coding and signal technology, applied in image communication, image data processing, instruments, etc.

Inactive Publication Date: 2007-10-10
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the world of consumer electronics, where such a problem is encountered, neither viable solution is an acceptable requirement due to cost

Method used

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  • Embedding a watermark in a coded signal
  • Embedding a watermark in a coded signal
  • Embedding a watermark in a coded signal

Examples

Experimental program
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Embodiment Construction

[0037] The following method describes an algorithm for inserting a "copy no more" watermark in a (possibly already watermarked) video signal in MPEG2 Transport Stream (TS) or Program Stream (PS) format. More information on the MPEG2 video compression standard can be found in the following documents:

[0038] [ISO96:1]ISO / IEC 13818:1:1996(E), "Information Technology-Generic Coding of Moving Pictures and Associated Audio Information: Systems (Information Technology-Generic Coding of Moving Pictures and Associated Audio Information: Systems)", Video International Standard (Video International Standard), 1996, and

[0039] [ISO96: 2] ISO / IEC 13818: 2: 1996 (E), "Information Technology-Generic Coding of Moving Pictures and Associated Audio Information: Video (Information Technology-Generic Coding of Moving Pictures and Associated Audio Information: Video)", Video International Standard (Video International Standard), 1996.

[0040] In the Applicant's International Patent Applicat...

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Abstract

Method and arrangement for water(re)marking a compressed video signal by modifying selected DCT coefficients. To avoid that the bitrate is thereby reduced too much, selected variable-length codewords are represented by escape codes. In order to avoid that ESC codes increase the bitrate too much (an ESC code is 7-21 bits longer than the corresponding VLC word), the bitrate is controlled in units of small data chunks. While a VLC is processed, a table is filled with candidate ESC codes. The bitrate controller tries to make the difference between original and processed data chunks zero by re-encoding one VLC into an appropriate ESC code.

Description

technical field [0001] The present invention relates to watermarking encoded signals, in particular, but not exclusively, to watermarking compressed video signals. Background technique [0002] Watermarking of coded signals, especially compression-coded signals, is performed on fixed-size compressed data forming part of a larger data stream. In order to add the watermark, some codewords in the compressed data are changed. This results in a change in data size. In order to incorporate the recoded data (which can be said to be data chunks) into the original data stream, the data size must be the same as the original fixed size in order to prevent problems with synchronization and sequence correctness, etc. [0003] In "Digital watermarking of MPEG2 coded video in the bitstream domain" by F.Hartung and B.Girod (Digital watermarking of MPEG2 coded video in the bitstream domain) (ICASSP Publishing, Vol. 4, 1997, pp. 2621-2624) A known method of embedding a watermark in a compr...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T2201/0053H04N21/8358G06T1/0035
Inventor G·C·兰格拉亚尔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV