Embedding and detecting method and system for image data watermark information

A technology of watermark information and image data, applied in the field of image processing, can solve problems such as poor real-time performance, complex implementation, and difficulty in meeting application requirements

Active Publication Date: 2007-07-25
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for embedding image data watermark information, aiming to solve the problems that existing image watermark embeddi...

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  • Embedding and detecting method and system for image data watermark information
  • Embedding and detecting method and system for image data watermark information
  • Embedding and detecting method and system for image data watermark information

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Embodiment Construction

[0093] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0094] The invention uses the low-frequency coefficients of the DCT to select the characteristic block, embeds the watermark information in the intermediate frequency part of the DCT domain of the characteristic block, and uses the statistical characteristics of the characteristic block to select the synchronization block to perform geometric calibration during watermark information detection. During detection, the detection terminal calculates the statistical characteristics of the feature block, estimates the geometric distortion of the image data frame and restores the geometric distortion,...

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Abstract

The method thereof comprises: a) using low frequency coefficient of discrete cosine transform (DCT) to extract multi feature blocks from the original image data frame; b) embedding watermark information into the middle frequency of DCT domain of said feature blocks; c) according to said multi feature blocks, determining the position of synchronous block; d) embedding synchronous symbol into the synchronous block. The invention can resist geometrical attack.

Description

Technical field [0001] The invention belongs to the field of image processing, and particularly relates to a method and system for embedding and detecting watermark information of image data. Background technique [0002] With the rapid development of computer, multimedia and network technology, image data is extremely rich, and can be easily obtained through the network, so that the image data can be easily copied and modified without any control, resulting in the copyright owner’s Rights and interests cannot be effectively protected. The use of digital watermarking information technology to embed information that is not easily detectable without affecting the product content can achieve the purpose of protecting image data from being copied and modified at will. [0003] At present, most digital watermark information schemes are based on the principle of spread spectrum communication. The embedding terminal modulates the watermark information with a pseudo-random sequence, and ...

Claims

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Application Information

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IPC IPC(8): H04N7/26G06T1/00H04N19/467
Inventor 刘文予钱莉张帆范云松
Owner HUAZHONG UNIV OF SCI & TECH
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