Quantization index modulation (QIM) digital watermarking of multimedia signals

A technique for quantizing index modulation and signal components, applied in simultaneous/sequential multi-TV signal transmission, recording signal processing, digital video signal modification, etc., and can solve problems such as incorrect results

Inactive Publication Date: 2005-05-25
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem in the QIM watermarking scheme is that the grid parameters need to be known on the detector side
However, this will lead to incorrect results if the watermarked signal undergoes degradation such as scaling

Method used

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  • Quantization index modulation (QIM) digital watermarking of multimedia signals
  • Quantization index modulation (QIM) digital watermarking of multimedia signals
  • Quantization index modulation (QIM) digital watermarking of multimedia signals

Examples

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Embodiment Construction

[0015] figure 1 Shown is a general schematic diagram of a system comprising a watermark embedder (or encoder) 1 and a detector (or decoder) 2 according to the invention. The watermark encoder embeds a watermark message b in the main signal s, so that the main signal s and the watermarked signal can be ignored s distortion between. Decoder 2 must be able to receive signals from s The watermark message is detected. figure 1 A "blind" watermarking scheme is shown. This means that the main signal s is not available to the decoder 2 .

[0016] In effect, the watermarked signal has undergone signal processing across the communication channel, and / or has been targeted for attack. The communication channel is in figure 1 is shown as channel 3 between embedder 1 and detector 2. The channel scales the amplitude of the watermarked signal by a factor a (typically a<1). The channel may also be noise-padded and / or additional offset introduced (not shown).

[0017] The watermark enc...

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Abstract

The invention addresses the problem of scale degradations that may occur in watermarking schemes based on quantization index modulation (QIM). In accordance with the invention, the quantization step size (D) being employed by the embedder (11) and detector (21) is derived (12, 22) from a measurable characteristic parameter which has the property that, when the applied signal is scaled by a factor (a), it is scaled by substantially the same factor. In a preferred embodiment, said parameter is the square root of the energy of the signal (), and the quantization step is a predetermined fraction (a) thereof.

Description

technical field [0001] The invention relates to a method and a device for embedding side information into a media signal by subjecting the signal components of the media signal to quantization index modulation. The invention also relates to a method and a device for retrieving such embedded data from a watermarked media signal. Background technique [0002] Digital watermarking is a technique for embedding auxiliary information into audiovisual objects. Digital watermarking has a wide range of applications, including copy (copyright) protection, royalty tracking, commercial authentication, value-added content, interactive toys, and more. The classical method of digital watermarking is basically noise addition, whereby a known noise-like signal w is added to modify the original signal s. Watermark detection is inherently correlated, where the resulting correlation value includes two components, the desired term <s, s> and the distractor term <s, w>. This latter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G11B20/00H04N1/387H04N7/08H04N7/081H04N7/26H04N7/30
CPCG06T1/0028G06T2201/0052G06T2201/0065G06T2201/0083G11B20/00086G11B20/00123G11B20/00884H04N19/60H04N19/126H04N19/467H04N21/8358H04N5/91
Inventor A·A·C·M·卡克
Owner KONINK PHILIPS ELECTRONICS NV
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