High-capacity reversible image watermarking algorithm with improved difference expansion

An image watermarking, high-capacity technology, applied in image data processing, image data processing, computing, etc., to achieve the effect of expanding capacity, small error, and high payload capacity

Active Publication Date: 2019-11-22
HUAIYIN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

This embedding method is more distinctive in overflow handling, but still needs to embed the compressed positioning map

Method used

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  • High-capacity reversible image watermarking algorithm with improved difference expansion
  • High-capacity reversible image watermarking algorithm with improved difference expansion
  • High-capacity reversible image watermarking algorithm with improved difference expansion

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Embodiment Construction

[0060] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0061] The generalized difference extension method used in the algorithm of the present invention:

[0062] The generalized difference extension method makes full use of the information redundancy between adjacent pixels, it selects multiple adjacent pixels for processing, and can be used to embed more watermark information, the present invention uses this method to select The original image pixel blocks are embedded with information.

[0063] Suppose X=(x 0 , x 1 , x 2 , x 3 ,...,x n-1 ) is a set of pixel values, then the positive transformation of the generalized integer transformation is:

[0064]

[0065] d 1 =x 1 -x 0

[0066] d 2 =x 2 -x 0

[0067]

[0068] d n-1 =x n-1 -x 0

[0069] For a set of pixel interpolation d 1 , d 2 ,...,d n-1 , the 1-bit watermark information can be hidden using formula (1) respectively:

[0070] d' i =2×...

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Abstract

The invention relates to image processing, the invention relates to the technical field of digital watermarking, and discloses a high-capacity reversible image watermarking algorithm with improved difference expansion. The algorithm comprises the steps of watermark embedding and watermark extraction, watermark embedding of an original image and watermark extraction of an image containing watermarks through cat face scrambling, a generalized difference expansion method, improved gray scale overflow processing and a difference quantification method. Compared with the prior art, the algorithm hasthe advantages that the pixel mean value before and after watermark embedding through a generalized difference expansion method is invariant, so that the smoothness value before and after watermark embedding is invariant, and watermark extraction is facilitated; an improved gray overflow processing method is used, on the premise that certain visual quality is guaranteed, watermark embedding can be conducted multiple times, and the watermark embedding capacity is increased; auxiliary information is embedded through a difference quantization algorithm, so that the method has relatively good imperceptibility and relatively high effective load capacity; and after the watermark is extracted, the original image can be completely recovered, the similarity between the extracted watermark and theoriginal watermark is extremely high, and the error is small.

Description

technical field [0001] The invention relates to the technical field of image processing and digital watermarking, in particular to a large-capacity reversible image watermarking algorithm with improved difference expansion. Background technique [0002] Reversible image watermarking refers to embedding the watermark into the original image under the premise of ensuring the visual quality of the original image, and when the watermark is extracted, the original image can be restored without loss. Compared with traditional digital image watermarking, reversible image watermarking puts forward higher requirements for watermark embedding, and also makes it more widely used in judicial, military, medical and other fields that require high image authenticity and integrity. research and application value. One of the basic goals of reversible image watermarking algorithm research is to obtain the maximum amount of effective information embedding with less distortion. [0003] Tian ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0092G06T2201/0203
Inventor 张正伟肖绍章王留洋高尚兵
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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