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Method and apparatus for quantized exponential modulation for watermarking an input signal

A technology for inputting signals and outputting signals, which is applied in voice analysis, instruments, etc., and can solve problems such as audio quality degradation

Active Publication Date: 2016-08-03
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem addressed by the present invention is to avoid audio quality degradation in each watermark embedding and removal step by improving the known QIM process

Method used

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  • Method and apparatus for quantized exponential modulation for watermarking an input signal
  • Method and apparatus for quantized exponential modulation for watermarking an input signal
  • Method and apparatus for quantized exponential modulation for watermarking an input signal

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Embodiment Construction

[0033] Reversible QIM Watermarking Embedded with Power Constraints

[0034] The present invention extends QIM to:

[0035] - making the mapping performed at the embedder invertible at the decoder, and

[0036] - Allows power constraints to be considered when embedding watermarks.

[0037] The correlation characteristic curve of the quantizer must satisfy the following two constraints:

[0038] - the difference between the input and output values ​​at any location should be no greater than T (embedded power constraints),

[0039] - The characteristic curve should be invertible, ie for any input value x there exists a unique output value y.

[0040] figure 1 An example of a characteristic curve of one of the quantizers with the innovative invertible QIM process embedded in power constraints is shown as a function of output y versus input x. The curve can be divided into three linear segments I, II, III indicated at the top of the figure. In segments I and III, the output i...

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Abstract

It is possible to achieve very high data rates with quantization index modulation QIM, and the capacity of watermark transmission is largely independent of the characteristics of the original audio signal, but the audio quality degrades at each watermark embedding and removal step. To avoid degrading the audio quality, the audio signal watermarking of the present invention uses a specific quantizer curve in the time domain, especially in the frequency domain, to embed the watermark message into the audio signal, making the process almost completely reversible. Furthermore, it has embedded power constraints in order to guarantee that the modification to the signal caused by watermark embedding is inaudible.

Description

technical field [0001] The invention relates to a method and apparatus for quantized exponential modulation for watermarking an input signal, wherein the input signal is quantized using different quantizer curves. Background technique [0002] In known digital audio signal watermarking, the audio quality degrades at each watermark embedding and removal step. [0003] One of the main methods of watermarking multimedia content is called quantization index modulation (QIM), see e.g. IEEE Journal of Information Theory May 2001 Vol. 47(4) pp. 1423-1443 B. Chen, G.W. Wornell Quantization Index Modulation: A Class of Provably Good Methods for Digital Watermarking and Information Embedding, or Proceedings of the IEE Colloquium on Secure Images and Image Authentication, London, UK, April 10, 2000, pp. 1-6, A Blind Watermarking Scheme Based on Structured Codebooks by J.J. Eggers, J.K.Su, B. Girod. [0004] Very high data rates can be achieved with QIM, and the capacity of the waterma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/018
CPCG10L19/018G10L19/008G10L19/035G10L19/24G10L21/038
Inventor P.贾克斯
Owner THOMSON LICENSING SA
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