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Reversible watermark method utilizing histogram shifting

A histogram translation and histogram technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of low watermark capacity and reduced usability, and achieve the goals of increasing embedded capacity, easy compression, and improving security and usability Effect

Inactive Publication Date: 2012-07-11
SUN YAT SEN UNIV
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  • Description
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Problems solved by technology

Existing reversible watermarking methods for histogram translation have some shortcomings, such as: low watermark capacity, need to transmit additional side information (such as peak points / zero points), which reduces usability

Method used

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  • Reversible watermark method utilizing histogram shifting
  • Reversible watermark method utilizing histogram shifting
  • Reversible watermark method utilizing histogram shifting

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] The invention uses a two-step embedding method to embed the watermark, and divides it into single-layer embedding and multi-layer embedding according to the size of the watermark information.

[0033] In order to facilitate the understanding of the present invention, first, a simple introduction of the difference domain histogram translation watermarking algorithm is given.

[0034] image is an N-pixel 8-bit grayscale carrier image, we use Indicates the grayscale image No. The gray value of pixels, where .

[0035] Scan the image in an "inverted S-type order" to obtain a one-dimensional sequence, and calculate the difference between pixels :

[0036] (1)

[0037] Calculate the histogram of the generated difference to obtain the optimized peak point P and zero point Z. For the watermarking algorithm base...

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Abstract

The invention provides a reversible watermark method based on histogram shifting and has significant practical values for protecting multimedia copyrights. By means of the reversible watermark method, traditional histogram shifting algorithms are improved in two aspects, firstly, 1 and 0 in a bite map are more imbalanced by arranging a generation process of the bit map on watermark embedding rather than in a non-pretreatment stage, so that compression is easier, and embedding capacity is improved; and secondly, the reversible watermark method is a two-step embedding method. The watermark blind extraction is achieved and troubles that the histogram shifting method needs extra side information transmitting are solved by dividing an image into an upper large area and a lower large area, subjecting the upper area to the watermark embedding, embedding the generated side information into the lowest significant bit containing watermark pixels in the area, and embedding the left watermark information and the replaced lowest significant information into the lower area.

Description

technical field [0001] The invention relates to the field of multimedia information security, in particular to a reversible watermark method utilizing histogram translation. Background technique [0002] In recent years, as an effective means of multimedia copyright protection, digital watermarking technology has attracted widespread attention in the academic circles. The traditional digital watermarking method emphasizes the imperceptibility, robustness and capacity of the watermark; although the watermark embedding makes the carrier distortion imperceptible, some special occasions in the military, medical and judicial fields often do not allow the watermark carrier with permanent distortion . Therefore, reversible watermarking technology came into being. Reversible watermarking requires that the decoder can not only extract the watermark completely, but also restore the original work without distortion after extracting the watermark. [0003] The reversible watermarking...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06F21/00G06F21/16
Inventor 王俊祥倪江群潘金伟
Owner SUN YAT SEN UNIV
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