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Method for robustly positioning tampered region by utilizing GLCM characteristic

A positioning method and image technology, which can be used in image analysis, image data processing, instrumentation, etc., and can solve problems such as robustness of post-processing operations.

Inactive Publication Date: 2010-12-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of robustness to commonly used post-processing operations in the positioning of tampered images, and can help forensics personnel analyze whether the image has undergone a tampering operation and locate the tampered area

Method used

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  • Method for robustly positioning tampered region by utilizing GLCM characteristic
  • Method for robustly positioning tampered region by utilizing GLCM characteristic
  • Method for robustly positioning tampered region by utilizing GLCM characteristic

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Experimental program
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Embodiment Construction

[0033] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0034] In the experiment, the images from different camera sources in the database are firstly classified and trained. Eight commonly used brands of cameras are selected, and Table 1 lists the models of all cameras used in the experiment and the resolutions of the samples used.

[0035] Table 1 Camera models and sample resolutions used in experiments

[0036] camera serial number

camera model

resolution

1

Kodak DC290

1440×960

2

Canon Eos450D

4272×2848

3

Casio EX-H10

4000×3000

4

FUJIFILM FinePix S250EXR

4000×3000

5

Panasonic DMC_FS7

3648×2736

6

Samsung WB550

4000×3000

7

sony a550

4592×3056

8

Ricoh GX200

4000×3000

[0037] In the experiment, each camera select...

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Abstract

The invention discloses a method for robustly positioning a tampered region by utilizing GLCM characteristic, and belongs to the technical field of signal and information processing. The method is characterized in that: by utilizing the image blocking thought, a quantitative DCT coefficient matrix of each image block is extracted, and a Gray Level Co-occurrence Matrix (GLCM for short) of the coefficient matrix is calculated and serves as the characteristic, the classes of the subimage blocks are judged by data trained in advance and the subimage blocks are marked by corresponding colors. Each image block is subjected to the operation repeatedly so as to obtain a detection result image; and if the result image has a marked color different from most regions, the region marked by the color may be the temperate region. The method has the advantages of positioning the temperate region of the tempered image, having robustness for the common image postprocessing operation, such as rotating, zooming and feather, and providing an effective tool for detecting the authenticity and completion of the images for judicial offices and criminal investigation departments. The method is suitable for the field of information security.

Description

technical field [0001] The invention belongs to the technical field of signal and information processing, and relates to an image forensics method for locating a tampered area in a tampered image, in particular to a robust positioning method for a tampered image using GLCM features. Background technique [0002] The most basic image tampering operation is to copy and paste the region of interest from the same image or different images, in order to cover up or tamper with part of the information of the original image. At the same time, in order to eliminate the tampering traces on the tampered image, the tamperer often performs processing and retouching operations such as scaling, rotating, and feathering on the tampered part. [0003] For the tampering operation of the same image, Hany Farid et al. proposed in the article "Exposing Digital Forgeries by Detecting Duplicated Image Regions" to use the principal component analysis (PCA) method to reduce the feature dimension, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 孔祥维董莉莎
Owner DALIAN UNIV OF TECH
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