Proceedings ArticleDOI
Quality factor estimation of JPEG compressed images
Thi Ngoc Canh Doan,Florent Retraint,Thanh Hai Thai,Cathel Zitzmann +3 more
- pp 104-108
TLDR
A new approach to estimate the quality factor value for a JPEG image based on the statistical model of variance of blocks 8 × 8 for JPEG images, characterized by two parameters which are used to calculate a distance between the first and the second compressions.Abstract:
The goal of the paper is to present a new approach to estimate the quality factor value for a JPEG image. This approach is based on the statistical model of variance of blocks 8 × 8 for JPEG images. The variance model follows Gamma distribution, characterized by two parameters which are used to calculate a distance between the first and the second compressions. The distance in case of compressing images twice with the same value of quality factor is exploited as characterized fingerprint for quality factor identification of a JPEG image. Experiments with simulated and real images highlight the relevance of the proposed approach.read more
Citations
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Journal ArticleDOI
Feature extraction optimization of JPEG steganalysis based on residual images
TL;DR: A novel adaptive scale adjustment algorithm can adaptively adjust the scale of the feature extraction filter according to the quality factor of JPEG images for better performance and a new weighted histogram method is proposed.
Proceedings ArticleDOI
A watermarking technique to secure printed QR codes using a statistical test
H. Phuong Nguyen,Agnès Delahaies,Florent Retraint,D. Huy Nguyen,Marc Pic,Frédéric Morain-Nicolier +5 more
TL;DR: In this article, a secure printed QR code which is robust against Scan & Reprint attack is presented, which replaces the background of the standard one by a specific textured pattern which does not affect the normal reading of the encoded message.
A watermarking technique to secure printed QR-Codes
Hoai Phuong Nguyen,Anges Delahaies,Florent Retraint,Dục Huy Nguyen,Marc Pic,Frédéric Morain-Nicolier +5 more
TL;DR: A novel technique is presented that permits to create a secure printed QR code which is robust against Scan & Reprint attack, constructed by replacing the background of the standard one by a specific textured pattern which does not affect the normal reading of the encoded message.
Journal ArticleDOI
Quality factor estimation of JPEG images using a statistical model
Florent Retraint,Cathel Zitzmann +1 more
TL;DR: A new approach to quality factor identification for a JPEG images is proposed, based on a spatial domain model of the variance of 8 × 8 blocks of JPEG images, which follows a Gamma distribution.
Posted Content
Estimation and Restoration of Compositional Degradation Using Convolutional Neural Networks.
TL;DR: A convolutional neural network model for estimating the degradation properties of a given degraded image and an image restoration model that adopts the estimated degradation properties as its input are introduced.
References
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Book ChapterDOI
Break our steganographic system: the ins and outs of organizing BOSS
TL;DR: This paper summarizes the first international challenge on steganalysis called BOSS (an acronym for Break The authors' Steganographic System), explaining the motivations behind the organization of the contest, its rules together with reasons for them, and the steganographic algorithm developed for the contest.
Journal ArticleDOI
Practical Poissonian-Gaussian Noise Modeling and Fitting for Single-Image Raw-Data
TL;DR: A signal-dependent noise model, which gives the pointwise standard-deviation of the noise as a function of the expectation of the pixel raw-data output, is composed of a Poissonian part, modeling the photon sensing, and Gaussian part, for the remaining stationary disturbances in the output data.
Journal ArticleDOI
A mathematical analysis of the DCT coefficient distributions for images
Edmund Y. Lam,Joseph W. Goodman +1 more
TL;DR: This work offers a rigorous mathematical analysis using a doubly stochastic model of the images, which not only provides the theoretical explanations necessary, but also leads to insights about various other observations from the literature.
Journal ArticleDOI
The distribution of the sum of independent gamma random variables
TL;DR: In this paper, the distribution of the sum of n independent gamma variates with different parameters is expressed as a single gamma-series whose coefficients are computed by simple recursive relations, and the distribution is expressed in terms of a simple recursive relation.
Proceedings ArticleDOI
The 'Dresden Image Database' for benchmarking digital image forensics
Thomas Gloe,Rainer Böhme +1 more
TL;DR: A novel image database specifically built for the purpose of development and bench-marking of camera-based digital forensic techniques and is intended to become a useful resource for researchers and forensic investigators.