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Lossless data embedding

A technology for data and data recovery, applied in the field of synthetic information signals, can solve the problems of limited availability of reversible printing watermarking schemes, and achieve the effect of high embedding rate

Inactive Publication Date: 2006-03-01
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This places a severe limit on the usability of reversible watermarking schemes

Method used

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Examples

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Embodiment Construction

[0015] figure 1 The system of the invention is shown schematically, comprising an embedding device 3 for embedding the auxiliary signal in the main signal and a reconstruction device 5 for reconstructing the main signal. The system consists of a discrete memoryless source 1 that produces a master sequence of symbols x from a discrete alphabet 1 N =x 1 x 2 ..x N . In the preferred embodiment, source 1 is a binary source whose symbol x i For example, the bits of a certain bit plane of a bitmap image, or the least significant bits of a specific DCT coefficient of a JPFG image. However, the invention is not limited to binary sources.

[0016] Ancillary data or source 2 generated independently of x 1 N A message index or message symbol wε{1, 2, . . . , M} with probability 1 / M. Embedding device 3 embeds message w in main sequence x 1 N and form the composite signal sequence y of the sign 1 N =y 1 the y 2 ..y N . We ask for the sequence y 1 N must be close to x 1...

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Abstract

Many methods for reversible watermarking (embedding schemes that allow perfect reconstruction of the original host signal) are highly fragile in the sense that the slightest modification of watermarked content prohibits the recovery of both the original signal as well as the embedded auxiliary data. In order to obtain robustness against transmission or channel errors, the embedding method according to the invention accommodates error correction data in a portion of the data embedding capacity. In an advantageous embodiment, the host signal ( 36 ) is segmented in segments, and error correction data (p(n)) for a segment (S(n)) is accommodated in data ( 37 ) being embedded in a subsequent segment (S(n+1)) along with restoration data (r(n)) for reconstructing the host signal. The remaining portion of the embedding capacity is used for payload (w).

Description

technical field [0001] The invention relates to a method of embedding auxiliary data in a host signal, comprising the steps of: generating a composite signal using a data embedding method having an embedding rate and a distortion, and using a first part of said embedding rate to provide (accommodate) recovering data for recovering the main signal, and a second portion of said embedding rate for embedding said auxiliary data. The invention also relates to a corresponding device for embedding auxiliary data in a main signal. [0002] The invention also relates to methods and devices for reconstructing such a main signal, and to a composite information signal with embedded data. Background technique [0003] An undesirable side effect of many watermarking and data hiding schemes is the distortion of the main signal in which the auxiliary signal is embedded. Finding the optimal balance between the amount of embedded information and the resulting distortion is therefore a pract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00H04N1/32G06T1/00H04N7/26H03M13/19H03M13/00
CPCG11B20/00086G11B20/0092H04N19/00557H03M13/19H04N19/467H04N1/387G11B20/10G06T1/00
Inventor A·A·C·M·卡克F·M·J·维勒姆斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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