Reversible watermarking method

A technology of watermarking and embedding watermarking, applied in the field of image processing, can solve problems such as bunker distortion and unusability, and achieve the effect of reducing distortion

Inactive Publication Date: 2020-06-23
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods still distort the mask after embedding the watermark
The image obtained after grayscale conversion of the original image may be considered a noisy image and cannot be used

Method used

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Embodiment Construction

[0034] Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. According to these detailed descriptions, those skilled in the art can clearly understand the present application and can implement the present application. Without departing from the principles of the present application, the features in different embodiments can be combined to obtain new implementations, or some features in certain embodiments can be replaced to obtain other preferred implementations.

[0035] Using the Bayer color filter array method to achieve the prediction of pixel values ​​in color images, the proposed algorithm utilizes spectral spatial correlation to achieve small prediction errors in the color difference domain to embed hidden data. Since such prediction errors tend to follow a Laplace distribution with relatively small variance, the proposed algorithm achieves high embedding capacity and good localization map qu...

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Abstract

The invention belongs to the technical field of image processing, and particularly relates to a reversible watermarking method. Existing methods still distort the blindage into which the watermark isembedded. An image obtained after gray scale conversion is performed on an original image may be considered as a noise image and cannot be used. The invention provides a reversible watermarking method, and the method comprises the following steps: 1, carrying out the preprocessing of an image, and converting a color image into a gray level image; 2, embedding information into a first channel and asecond channel of the color image; and 3, adjusting the offset of the first channel and the second channel after the information is embedded through the third channel. The image distortion degree canbe reduced after information is embedded, the gray value of the image is not changed, and the method is used for subsequent color image processing, for example, reading materials are made for achromatopsia people.

Description

technical field [0001] The present application belongs to the technical field of image processing, and in particular relates to a reversible watermarking method. Background technique [0002] In recent years, with the rapid development of Internet technology and the popularization of digital devices such as mobile phones and computers, digital multimedia including images, texts, videos, audios, etc. as information carriers has gradually been recognized and accepted by the public. But at the same time, these multimedia information are easily tampered, copied and disseminated maliciously by illegal parties, which seriously damages the interests of property rights owners. In addition, copyright protection and information security are also paid more and more attention. Traditional encryption technology protects the content during the transmission of data by the sender, but after the data is received and decrypted, the data is very likely to be illegally copied and tampered with....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0203G06T1/00
Inventor 常杰丁峰王员根杨建权朱国普
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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