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Detecting Doctored Images Based on Double JPEG 2000 Compression

Author: WangHaiYing
Tutor: ZhangJing
School: Tianjin University
Course: Signal and Information Processing
Keywords: Double JPEG 2000 compression Image tampering Wavelet Transform Tamper detection
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 135
Quote: 1
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With the rapid development of computer and network technology , the emergence of high-resolution digital camera and a powerful image-editing software ( such as : Adobe Photoshop , Microsoft Photo Editor , CorelDRAW , etc. ) , image tampering has become increasingly common, and , tampering after the image is difficult to identify the authenticity. If the the tampered image for the news media or court exhibits , will cause a great impact on society . Therefore is very important to identify the authenticity of the digital image for image tampering detection , the current has become a hot research field of information . This article image tamper detection , based on the JPEG 2000 image compression standard , good performance and prospects for the development of the proposed based JPEG 2000 double-compressed image tampering detection algorithm . The article first analyzes the statistical properties of the sub-band of DWT coefficients double-compressed JPEG 2000 , and its amplitude-frequency characteristics of the sub-band DWT coefficients histogram Fourier transform , this feature showed : compared with a compression double compression magnitude there is a big peak point spectrum in the high frequency phenomenon . In this paper, the wavelet transform to extract a larger peak point ( singular point ) , and calculate the the larger peak point the cause of the poor ( the difference between the maximal and minimal values ??) , judged by the poor thresholding images with or without secondary JPEG 2000 compression. Second , the paper elaborated been tampered JPEG 2000 image tampering area and not tampered area can be divided into the basis , and according to this basis proposed method to locate the tampered region . The experiments show that the proposed algorithm not only can effectively detect JPEG 2000 dual compressor , but also accurately locate tampered area of the image .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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