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Digital watermark method based on integer wavelet without damage to image

A digital watermark and image technology, which is applied in the fields of electronic digital data processing, image enhancement, image communication, etc., to achieve the effect of wide application range and easy detection of information loss or malicious attack

Inactive Publication Date: 2002-11-13
SHENZHEN POKA ELECTRONICS EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] In short, so far, lossless digital watermarking at home and abroad is carried out in the space domain, and there is no report of using wavelet lossless digital watermarking

Method used

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  • Digital watermark method based on integer wavelet without damage to image
  • Digital watermark method based on integer wavelet without damage to image
  • Digital watermark method based on integer wavelet without damage to image

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Embodiment Construction

[0060] The present invention will be further described in detail below in conjunction with the accompanying drawings, please refer to the accompanying drawings. figure 1 The watermarking operation of embedded data can be divided into 5 steps, and the watermarking operation of extracting data can be regarded as the opposite 5 steps, see Table 1 and Table 2.

[0061] steps

[0062] steps

[0063] Please see attached Figure 2-1 to 2-4 Histogram adjustment plot. in Figure 2-1 and Figure 2-4 Schematic diagrams of the original image and the watermarked histogram, respectively. The key to lossless image recovery after embedding digital watermark in wavelet domain is the preprocessing of histogram adjustment. in Figure 2-2 The purpose of the first histogram processing is to prevent the overflow of wavelet inverse transform. After the first histogram processing, the left and right gray-scale sidebands are removed, so that the original image histogram becom...

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Abstract

A nondestructive watermark method based on integer wavelets features that a computer software is used to embed data in the digital image which can be restored without destruction, and includes embedding the digital watermark and extracting it. For embedding digital watermark, the steps are first to regulate the grayscale histogram, wavelet conversion, embedding data, reverse conversion of wavelet, and the second regulation of grayscale histogram to form the addition of watermark picture. Extracting digital watermark includes such steps as the third regulation of grayscal histogram, conversionof wavelet, extracting data, reverse conversion of wavelet and the fourth regulation of grayscal histogram. It can ensure that the images before and after the watermark is embedded have the smalest visual difference.

Description

technical field [0001] The present invention relates to the process of embedding data in digital images and recovering them without damage by using computer software. The "integer wavelet-based" in the "Lossless Image Digital Watermarking based on Integer Wavelet" of the present invention refers to embedding data in the image wavelet transform domain rather than directly in the image space domain. Due to the adoption of the histogram gray scale dynamic range adjustment measure, the wavelet transform can avoid distortion. "Lossless image" means a reversible process, that is, from the watermarked image, the original data and image can be completely restored at the same time. "Digital watermarking" is a data hiding technology. The size of the image before and after embedding data is the same, and the difference between the image before and after embedding cannot be distinguished by the naked eye. Background technique [0002] With the rapid develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0028G06T2201/0052
Inventor 宣国荣柴佩琪
Owner SHENZHEN POKA ELECTRONICS EQUIP
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