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Color image watermark embedding method, detection method and system

A color image and watermark embedding technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of reducing the detection ability of the algorithm, achieve the effect of reducing the difference of the model, improving the robustness, and good robustness

Pending Publication Date: 2019-09-13
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventor found that the existing watermark image embedding and detection method will greatly reduce the detection ability of the algorithm in the blind watermark system due to the error of the model itself

Method used

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  • Color image watermark embedding method, detection method and system
  • Color image watermark embedding method, detection method and system
  • Color image watermark embedding method, detection method and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] figure 1 A flow chart of a color image watermark embedding method in Embodiment 1 is provided.

[0056] Such as figure 1 As shown, the color image watermark embedding method of the present embodiment includes:

[0057] S101: Convert the source image from the RGB color space to the YCbCr color space;

[0058] The simulation uses a 512*512 color image, and embeds a 64*64 binary watermark image into it respectively, and records the experimental results.

[0059] The color space conversion formula used is as follows:

[0060]

[0061]

[0062] Among them, R (red), G (green), and B (blue) respectively represent the three color channels of the original image. Y,Cb,Cr represent converted luminance (Y) and color channels (Cb,Cr).

[0063] S102: Use the Y channel image as the carrier image and perform block discrete cosine transform, and extract the coefficient vector to be embedded in the watermark in each block.

[0064] Perform 8*8 block DCT (discrete cosine trans...

Embodiment 2

[0141] Figure 8 A flow chart of a color image watermark detection method in Embodiment 2 is provided.

[0142] Such as Figure 8 As shown, the color image watermark detection method of the present embodiment includes:

[0143] S201: Convert the source image from the RGB color space to the YCbCr color space;

[0144] S202: Use the Y channel image as the carrier image and perform block discrete cosine transform, extract the coefficient vector to be embedded in the watermark in each block; calculate the JND value based on the direction diversity for each block of the Y channel, and select the Cb color at the same time The channel calculates the influence factor of color complexity, and constructs a JND perception model based on directional diversity and color contrast;

[0145] JND Perceptual Model Based on Orientation Diversity and Color Contrast:

[0146]

[0147] Among them, E jnd (m, n) is the visual redundancy threshold of the (m, n)th block, m and n are both positi...

Embodiment 3

[0161] Figure 9 A schematic structural diagram of a color image watermark embedding system according to Embodiment 3 is provided.

[0162] Such as Figure 9 As shown, the color image watermark embedding system of the present embodiment includes:

[0163] (1) color space conversion module, it is used for converting source image from RGB color space to YCbCr color space;

[0164] (2) JND perception model building block, which is used to use the Y channel image as the carrier image and perform block discrete cosine transform, and extract the coefficient vector to be embedded in the watermark in each block; calculate the direction based on each block of the Y channel Diversity of JND values, while selecting the Cb color channel to calculate the color complexity impact factor, and constructing a JND perception model based on directional diversity and color contrast;

[0165] JND Perceptual Model Based on Orientation Diversity and Color Contrast:

[0166]

[0167] Among them...

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Abstract

The invention provides a color image watermark embedding method, a detection method and system. The color image watermark embedding method comprises the following steps: converting a source image froman RGB color space to a YCbCr color space; taking a Y-channel image as a carrier image, performing block discrete cosine transform, and extracting a coefficient vector of the watermark to be embeddedin each block; calculating a JND value based on the direction diversity for each block of the Y channel, selecting a Cb color channel to calculate a color complexity influence factor, and constructing a JND perception model based on the direction diversity and the color contrast; calculating a quantization step size corresponding to each coefficient vector, and embedding watermark sequence information into each block by utilizing a jitter modulation algorithm of a logarithm domain; and performing reconstruction to obtain a Y-channel image with the watermark embedded, and converting the Y-channel image, a Cb-channel image of the source image and a Cr-channel image into an RGB color space to obtain a final color image with the watermark embedded.

Description

technical field [0001] The disclosure belongs to the technical field of multimedia signal processing, and in particular relates to a color image watermark embedding method, detection method and system. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, with the rapid development of network technology and information technology, multimedia information transmitted in digital form has gradually become the mainstream information transmission method. Its convenient storage, copying and dissemination have brought great convenience to people's life. However, with the transmission and use of a large amount of information, issues related to digital information have increasingly attracted people's attention. Among them, with the popularization of electronic devices such as personal computers and personal smart phones, more and more ...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0065G06T2201/0052
Inventor 万文博王俊孙建德
Owner SHANDONG NORMAL UNIV
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