Blind digital image watermarking methods that resist printing and reshooting

A technology of digital images and printed images, applied in image data processing, image data processing, instruments, etc., to achieve fast watermark detection and good visual effects.

Active Publication Date: 2019-01-18
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the electronic original version of the printed image is often not available, the watermark extraction process can only use the printed image itself, so the watermarking requirement f...

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  • Blind digital image watermarking methods that resist printing and reshooting
  • Blind digital image watermarking methods that resist printing and reshooting
  • Blind digital image watermarking methods that resist printing and reshooting

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Embodiment Construction

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0051] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...

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PUM

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Abstract

The invention provides a blind digital image watermarking method resistant to printing and reshooting. The method comprises the following steps of: a watermark pattern of a centrally symmetrical graphis designed; the watermark pattern is embedded into lab color space of the carrier image to obtain the watermark image. a color printer is used to print the watermark image to obtain a printed image.a camera is used to take photographs of printed images, captured image is obtained, the captured image is converted into lab color space and inverse geometric transformation is carried out to obtaina watermark estimated image, the image block with the same size as the watermark pattern is located and clipped from the watermark estimated image, the normalized phase relation value between the image block and the watermark pattern is calculated, and whether the watermark pattern is included in the captured image is judged according to the normalized phase relation value. By embedding watermarksinto two color channels in Lab color space at the same time, the method of the invention originally proposes a watermark synchronization method of inverse geometrical transformation by using periodicimage self-convolution, which can extract watermarks from printed rephotographed images.

Description

technical field [0001] The invention relates to the technical field of digital image watermarking, in particular to a blind digital image watermarking method resistant to printing and reshooting. Background technique [0002] The rapid popularization of Internet technology has provided great convenience for the dissemination of digital media such as audio, image and video, and the acquisition of digital media has become almost costless. At the same time, the illegal acquisition, misappropriation and tampering of digital media are also intensifying, which not only brings troubles to the authors of media works and media, but sometimes even affects the credibility and security of the country. Digital watermarking technology emerges at the historic moment and plays a huge role in digital media authentication and copyright protection. [0003] Digital image watermarking technology refers to embedding a small amount of watermark information into digital images, while the original...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0051G06T2201/0065
Inventor 倪蓉蓉赵耀张萌萌
Owner BEIJING JIAOTONG UNIV
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