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Method for identifying JPEG compressed digital picture

A recognition method and digital image technology, applied in image communication, digital video signal modification, television, etc., can solve the problems of poor detection efficiency of JPEG image detection algorithm, and achieve the effect of improving detection effect

Inactive Publication Date: 2010-05-19
SUN YAT SEN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a simple and effective identification method for digital image JPEG compression aiming at defects such as poor detection efficiency of existing JPEG image detection algorithms

Method used

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  • Method for identifying JPEG compressed digital picture
  • Method for identifying JPEG compressed digital picture
  • Method for identifying JPEG compressed digital picture

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the drawings.

[0025] The flowchart of the present invention is attached figure 1 As shown, it includes the steps: (1) Calculate the DCT coefficients of the non-saturated block of the image; (2) Statistical AC coefficients in the region R 1 = (-1, +1) and area R 2 = (-2, -1) ∪ (+1, +2) number; (3) Calculate the image characteristics and determine whether the image is compressed by JPEG.

[0026] Each step is as follows:

[0027] Step (1), calculate the DCT coefficient of the unsaturated block

[0028] Assume that the image to be tested is I and its size is M×N. As attached figure 2 As shown, first decompose I into Bz×Bz (set Bz=8) image blocks with no overlapping area, denoted as Blk(j), j=1, 2,...[M / Bz][N / Bz] . For each small image block Blk(j), it is determined whether there are pixels of 0 and 255 in the block, if there are pixels, the next image block is processed, otherwise the DCT coefficient of...

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Abstract

The invention provides a method for identifying a JPEG compressed digital picture, comprising the following steps: (1) diving the picture into blocks, and then processing and calculating a DCT coefficient of an unsaturated block in the picture; (2) keeping statistics of numbers of the AC coefficient in step (1) in a sector R1= (-1, +1) and a sector R2 = (-2, -1) U (+1, +2), recording as r1 and r2; (3) regarding s = r2 / r1as a feature of the picture and identifying the feature with a threshold T; if s is less than or equal to the threshold T, the picture is identified as being processed by JPEG compressing; otherwise, the picture is identified as not being processed by JPEG compressing. The invention can rapidly and effectively identify whether the picture is processed by the JPEG compressing; compared with the existing method, the identifying efficiency is greatly developed, thereby being capable of effectively identifying the picture having a size of 8 *8 and a JPEG picture having a compressibility factor greater than 95.

Description

Technical field [0001] The invention belongs to the field of information security and information forensics of digital images. Specifically, it involves a method that can quickly and effectively determine whether a given image is compressed by JPEG. technical background [0002] JPEG is a widely used digital image format. For example, the output of various digital cameras is mostly in JPEG format. Commonly used image processing software (such as Photoshop, GIMP, etc.) all support JPEG compression. Therefore, studying the statistical characteristics of this type of image is helpful to analyze image authentication issues such as the authenticity, completeness, and origin of the image. However, in some cases, digital images are often processed or saved in BMP format. At this time, it is impossible to know from the header file of the image whether it has been JPEG compressed. [0003] The existing JPEG image recognition technology is mainly based on detecting the blocking artifacts ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/625
Inventor 骆伟祺黄继武
Owner SUN YAT SEN UNIV
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