Method for embedding bittorrent Robust digital figure watermark and testing method and apparatus

A digital image and watermark embedding technology, applied in image data processing, image data processing, instruments, etc., to achieve the effect of enhancing robustness

Active Publication Date: 2007-05-30
HUAQI RES INST OF IMAGE COMPUTING
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Problems solved by technology

Op De Beeck et al proposed a watermark detection method and device in the patent document "Op DeBeeck et al. Method and apparatus for detecting a watermark in amanipulated image. Unit

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  • Method for embedding bittorrent Robust digital figure watermark and testing method and apparatus
  • Method for embedding bittorrent Robust digital figure watermark and testing method and apparatus
  • Method for embedding bittorrent Robust digital figure watermark and testing method and apparatus

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Embodiment Construction

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, please refer to the accompanying drawings. Fig. 1 is a flow chart showing a method and device for bitstream robust digital image watermark embedding and detection, which is divided into two parts: embedding digital watermark and detecting digital watermark.

[0037] The structure of the embedding device includes a modulation device that uses a pseudo-random sequence to perform spread-spectrum modulation on the bit stream data; a construction device that constructs the modulated signal into an axisymmetric watermark; according to the masking effect of the original digital image, the constructed watermark is periodically automatically Adapts to embedded devices embedded in raw digital images. Wherein the modulation device includes an encoder that can perform error correction encoding on the original bit stream data, and then add a flag bit that is u...

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Abstract

A detecting method and device for the embedding of bit flow robust digital image watermark are disclosed that belongs to the digital image watermark technique, the data is embedded in the digit image and can be extracted accurately, even if the picture is processed by image operation, for example, magnification, contraction, rotating, inverting, mirroring, printing-scanning and so on. It includes two parts of embedded digit watermark and detecting digit watermark. A method and device for embedded digit watermark include: the data is encoded and modulated, and the encoded signal form an axial symmetry cycle watermark are embed into the digit image self-adaptively. The method and device for detecting the watermark include: calculating the auto-correlation function of forecasting watermark, judging the affine transformation parameter which the image undergo by the coordinate of auto-correlation function local peak value, and recovering the image according to the parameter. Finally, forecasting the watermark from the recovered image, and the data is extracted after demodulation and decoding.

Description

technical field [0001] The invention belongs to the technical field of digital image watermarking, in particular to a bit stream robust digital image watermark embedding and detection method and device. Background technique [0002] At present, the rapid development of computers and networks has changed people's lives in many ways. Many of the results of people's creation and production are stored and transmitted digitally. The exchange of multimedia information based on computer and network provides a convenient way for the use and dissemination of digital works, which makes digital works have great advantages compared with traditional works. However, digital works are extremely easy to be copied and duplicated illegally, and piracy has become the biggest threat to the digital industry. For digital media copyright owners, the requirement of copyright protection is imminent. The copyright protection of digital works is not only a legislative issue, but also a very importa...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 桑茂栋田新
Owner HUAQI RES INST OF IMAGE COMPUTING
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