Lossless digital watermark method having regioselectivity

A region-selective, digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as inconvenience and restoration has to be performed every time

Inactive Publication Date: 2009-02-11
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the distortion caused by embedding the watermark is distributed over the entire data area instead of being localized outside the region of interest
If these methods are applied to medical data, in order to ensure that the data in the region of interest does not affect the accuracy of medical diagnosis due to the distortion caused by the embedded watermark, the extraction of watermark information and the restoration of the original signal have to be carried out every time. Bring great inconvenience to practical application

Method used

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  • Lossless digital watermark method having regioselectivity
  • Lossless digital watermark method having regioselectivity
  • Lossless digital watermark method having regioselectivity

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Embodiment Construction

[0024] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] by figure 1 The medical ultrasound image shown in (a) and the Figure 4The one-dimensional electrocardiogram signal shown in (a) is used as the original data, and the method of the present invention is used to embed and extract the lossless digital watermark.

[0026] 1. Selection of embedding area

[0027] First, the original data is divided into non-overlapping small data blocks of size N, where N is an integer, and the values ​​in each data block form a one-dimensional vector u=(u 0 , u 1 ,...,u N-1 ). For such as figure 1 For the image data in (a), when N is set to 4, the small data block can be formed by the grayscale or color value of adjacent 2×2 pixels; for example Figure 4 For the one-dimensional data in (a), when N is set to 3, the small data block can be composed of the values ​​of 3 adjacent sampling...

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Abstract

The invention supplies a undamage digital watermark method with the region selectively, divides the primary data into the size equal mutually and not overlap small block data, can insert the wilfully bit information to each small block data use the reversible integer transformation, after inserts the information whether can cause overflow or underflows, divides each block data into may insert and cannot be inserted, then choose actual inserts region, in the region all smallblock datas completely is may insert. The invention Can cause the watermark insert consciously avoids the interest region, thus cannot influent the datat in the interest region. The region description information is inserted to the data, guaranteed the watermark extract can reconstruct these regions. Is needing time can completely restore the primary data.

Description

technical field [0001] The invention relates to a non-destructive digital watermark method with regional selectivity, which is suitable for fields that are very sensitive to information distortion, such as medical data, military images, etc., and can be used for information integrity authentication. Background technique [0002] Digital watermark technology is to embed watermark information (such as authentication information or other arbitrary information) directly in the host signal, which has the characteristics of imperceptibility. In the watermark signal embedding process, the original signal will inevitably be distorted. However, this distortion is unacceptable for some application domains. For example, traditional medicine has very strict requirements for medical images used for diagnosis, and often does not allow any distortion of the data in the region of interest. Lossless digital watermarking (also known as reversible watermarking) allows the original signal to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 郭小涛庄天戈
Owner SHANGHAI JIAOTONG UNIV
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