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Digital image authenticity identification method based on CFA interpolation characteristic

A digital image and interpolation image technology, applied in the field of authenticity identification of digital images, to achieve good robustness

Active Publication Date: 2018-11-20
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the detection results of the above methods are also relatively susceptible to image content changes and JPEG (Joint Photographic Experts Group, Joint Photographic Experts Group) compression

Method used

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  • Digital image authenticity identification method based on CFA interpolation characteristic
  • Digital image authenticity identification method based on CFA interpolation characteristic
  • Digital image authenticity identification method based on CFA interpolation characteristic

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Embodiment Construction

[0038] Preferred embodiments of the present invention are described in detail as follows in conjunction with the accompanying drawings:

[0039] Such as image 3 Shown is an example of a natural image from the UCID (Uncompressed Color Image Database, uncompressed color image library), such as Figure 4 The example of a tampered image generated using the UCID library is shown in the example. When generating a tampered image, the inter-channel interpolation algorithm is used to perform CFA interpolation, and then part of the content of the re-interpolated image is spliced ​​to a random position in the real image to obtain a tampered image.

[0040] Such as figure 1 As shown, a digital image authenticity identification method based on CFA interpolation characteristics, the specific steps are as follows:

[0041] 1) Divide the image I to be tested into 3×3 image blocks of the same size, denoted as I 1 , I 2 , I 3 ... I 9 ;

[0042] 2) For image block I 1 ~ I 9 Extract the...

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Abstract

The invention discloses a digital image authenticity identification method based on a CFA interpolation characteristic. The method comprises a step of extracting a spectral variation and a chrominancedistortion characteristic in blocks to reflect the CFA interpolation characteristic according to a spectral difference between an interpolated image and an ideal full-color image, a step of calculating an interpolation characteristic change before and after re-interpolation to be a forensic characteristic, and a step of classifying by using a support vector machine and authenticating the image isaccording to the inconsistency of forensic characteristics between adjacent blocks. Compared with the prior art, the influences of JPEG image compression, image content and imaging device changes canbe effectively resisted, and the robustness is improved.

Description

technical field [0001] The invention relates to a digital image authenticity identification method based on CFA (color filter array, color filter array) interpolation characteristics. Background technique [0002] Nowadays, the modification of image content is becoming more and more easy, and sometimes it is difficult for people to distinguish the authenticity of images with the naked eye, so digital image authenticity identification technology has emerged as the times require. Digital image authenticity identification technology refers to the analysis, identification and authentication of digital image tampering. The current mainstream digital image authenticity identification methods can be divided into three categories: 1) technology based on the consistency of imaging equipment, 2) image tampering based 3) technology based on the inherent statistical characteristics of the image. Among them, the authenticity detection based on the trace characteristics left in the image...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/90G06T3/40G06K9/62
CPCG06T3/4023G06T7/90G06T2207/20081G06T2207/10004G06F18/2411
Inventor 方针苏文煊周佳欣王星雨
Owner SHANGHAI UNIV
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