Method for authenticating digital images of digital camera

A digital image and digital camera technology, applied in the field of digital image authentication of digital cameras, can solve the problems of poor pattern noise quality, long time-consuming, inconsistent camera template quality, etc., to ensure the difference, improve algorithm efficiency, and save acquisition the effect of time

Inactive Publication Date: 2009-12-30
SUN YAT SEN UNIV
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Problems solved by technology

The disadvantage of this method is that researchers often need to spend a long time to capture enough natural images with rich differences as an image library, and it is easy to cause inconsistent quality of camera templates extracted from image libraries obtained by different photographers
However, because the influence of quantization noise brought by JPEG compression is ignored in the derivation process, the quality of the obtained pattern noise is poor.

Method used

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  • Method for authenticating digital images of digital camera
  • Method for authenticating digital images of digital camera
  • Method for authenticating digital images of digital camera

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Embodiment Construction

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

[0032] The object tested in this embodiment is a Sony Cyber ​​Shot T77 (Sony T77 for short) digital camera.

[0033] The specific operation process of the present invention is as appended figure 1 shown, including the following steps:

[0034] (1) Program to generate a 1024×1280 random Gaussian white noise matrix noise, the mean value of Gaussian distribution μ=128, standard deviation σ = 128 3 ;

[0035] (2) Convert the noise to a grayscale image and display it on a display with a resolution of 1024×1280;

[0036] (3) Use the detected digital camera to take pictures of the content displayed on the monitor, so that a picture required for extracting the camera mode noise is obtained;

[0037] (4) Repeat the above steps 100 times to obtain 100 pictures for extracting pattern noise;

[0038] ...

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Abstract

The invention discloses a method for authenticating digital images of a digital camera. The method comprises the following steps: acquiring digital images shot by the digital camera, extracting the pattern noise of the digital camera by the acquired digital images, and authenticating the digital images on the basis of the pattern noise; wherein, the method is characterized in that the operation for acquiring the digital images comprises the following steps: selecting a plurality of independent random noise images, and displaying the random noise images on the same display in sequence; and then, shooting the displayed random noise images one by one by the digital camera to be detected, thereby acquiring the required plural digital images. The invention can greatly save time for taking pictures on the premise that the difference in image content is guaranteed, and improves the algorithm efficiency. The invention is applicable to the fields of digital forensics and image authentication as well as source detection, copyright protection, tamper-proofing and the like of digital pictures.

Description

technical field [0001] The invention belongs to the technical field of digital image passive authentication, in particular to a digital image authentication method of a digital camera. technical background [0002] At present, photos are mostly taken by digital cameras, and are recorded and stored in the form of digital signals. Since there are no so-called "originals" preserved in physical form in the past, such as photo negatives or paper manuscripts, it is difficult to verify the authenticity of these materials in the event of legal disputes. [0003] Passive image authentication technology is currently a commonly used method to identify the authenticity of digital images. The idea of ​​passive image authentication technology is to treat various physical constraints introduced by the imaging system in the process of digital imaging and the impact on images as digital images. Natural "fingerprints" hidden in photographs. By examining the presence or absence of these "fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/40G06T1/00
Inventor 屈振华李寅祥康显桂黄继武
Owner SUN YAT SEN UNIV
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