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Digital watermark embedding environment determination method, device and equipment and readable storage medium

A technology for digital watermarking and determining methods, applied in image data processing, image data processing, instruments, etc., can solve the problems of small watermark capacity, poor watermark embedding environment, poor extraction effect, etc. The effect of stickiness and watermark volume

Active Publication Date: 2020-04-10
北京奇良海德印刷股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of small watermark capacity, poor extraction effect and poor watermark embedding environment in the above-mentioned prior art, and provide a digital watermark embedding environment determination method, device, equipment and readable storage medium

Method used

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  • Digital watermark embedding environment determination method, device and equipment and readable storage medium
  • Digital watermark embedding environment determination method, device and equipment and readable storage medium
  • Digital watermark embedding environment determination method, device and equipment and readable storage medium

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Experimental program
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Effect test

Embodiment

[0104] see Figures 4 to 17 , now the Lena image is used as the host image, the size is 256*256, and the Shaanxi University of Science and Technology logo is used as the watermark. The image size is 256*256, that is, the watermark capacity is the largest. Use MATLAB tools to edit the code and determine the best embedding extraction environment .

[0105] Step 1. Preprocess the host image and watermark image to determine their size.

[0106] Open Photoshop to preprocess the image, and the size of the Lena image is determined to be 256*256, and the school emblem of Shaanxi University of Science and Technology is determined to be 256*256.

[0107] Step 2, based on the method of DCT-SVD, the image determined in step 1 is embedded with watermark in MATLAB.

[0108] First, read the Lena image, if the Lena image is in RGB color mode, keep the RGB color mode, if it is in other color mode, convert to RGB mode, and separate the monochrome channel A 1 , for monochrome channel A1 Perfo...

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Abstract

The invention belongs to the field of anti-counterfeiting of printed matters, and discloses a digital watermark embedding environment determination method, device and equipment and a readable storagemedium. The method comprises the steps of embedding a watermark image into a host image through a DCT-SVD method in a preset embedding strength and color mode to obtain an embedded image; printing theembedded image and performing scanning or photographing to obtain a scanned image; performing watermark extraction on the scanned image to obtain an extracted watermark image; modifying the preset embedding strength and the color mode and repeating the above steps; and comparing and evaluating the embedded image and the host image as well as the extracted watermark image and the watermark image through a PSNR image evaluation method to obtain the optimal embedding strength and the optimal embedding color mode of the watermark image. Through the method, the embedding strength range and the color mode of the digital watermark can be obtained, and the watermark capacity and the printing-scanning / photographing resistance of the digital watermark are improved.

Description

technical field [0001] The invention belongs to the field of printed matter anti-counterfeiting, and relates to a digital watermark embedding environment determination method, device, equipment and a readable storage medium. Background technique [0002] Digital watermarking technology is a technology that can embed and extract meaningful or meaningless identification information into host information through certain methods. The host information contains watermark information, which does not affect the integrity of the host information, and the embedded information is invisible, but can be decrypted by the key to reveal the hidden information. This technology is one of the effective means to prevent illegal copying, illegal tampering and copyright protection of digital media. [0003] With the development of image processing software and copying software and hardware facilities, it is easy for paper media to be digitized, tampered with and copied again. One of the importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021Y02D10/00
Inventor 郭凌华穆萌马策践丁亭文海敬溥陈睿王杰张逸阳
Owner 北京奇良海德印刷股份有限公司
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