A clustering-based framework for improving the performance of JPEG quantization step estimation
Quantization plays a pivotal role in JPEG compression with respect to the tradeoff between
image fidelity and storage size, and the blind estimation of quantization parameters has …
image fidelity and storage size, and the blind estimation of quantization parameters has …
Quantization step estimation for JPEG image forensics
In image forensics, quantization step estimation plays a crucial role in revealing the JPEG
compression history. This study focuses on the estimation for images that have been JPEG …
compression history. This study focuses on the estimation for images that have been JPEG …
JPEG quantization step estimation and its applications to digital image forensics
TH Thai, R Cogranne, F Retraint - IEEE Transactions on …, 2016 - ieeexplore.ieee.org
The goal of this paper is to propose an accurate method for estimating quantization steps
from an image that has been previously JPEG-compressed and stored in lossless format …
from an image that has been previously JPEG-compressed and stored in lossless format …
JPEG quantization step estimation with coefficient histogram and spectrum analyses
This paper proposes a new method for estimating quantization steps (QSs) from an image
that has been previously JPEG-compressed and stored in a lossless format. In this method …
that has been previously JPEG-compressed and stored in a lossless format. In this method …
Statistical model of JPEG noises and its application in quantization step estimation
In this paper, we present a statistical analysis of JPEG noises, including the quantization
noise and the rounding noise during a JPEG compression cycle. The JPEG noises in the first …
noise and the rounding noise during a JPEG compression cycle. The JPEG noises in the first …
First quantization matrix estimation for double compressed JPEG images utilizing novel DCT histogram selection strategy
N Dalmia, M Okade - Proceedings of the Tenth Indian Conference on …, 2016 - dl.acm.org
The Double JPEG problem in image forensics has been gaining importance since it involves
two compression cycles and there is a possibility of tampering having taken place after the …
two compression cycles and there is a possibility of tampering having taken place after the …
[HTML][HTML] CNN-based first quantization estimation of double compressed JPEG images
Multiple JPEG compressions leave artifacts in digital images: residual traces that could be
exploited in forensics investigations to recover information about the device employed for …
exploited in forensics investigations to recover information about the device employed for …
Mse period based estimation of first quantization step in double compressed jpeg images
The estimation of the first quantization step in double JPEG compressed images is still a
challenging problem, especially when the first quantization step q 1 is smaller than the …
challenging problem, especially when the first quantization step q 1 is smaller than the …
[HTML][HTML] Estimating previous quantization factors on multiple JPEG compressed images
The JPEG compression algorithm has proven to be efficient in saving storage and
preserving image quality thus becoming extremely popular. On the other hand, the overall …
preserving image quality thus becoming extremely popular. On the other hand, the overall …
Robust first quantization matrix estimation based on filtering of recompression artifacts for non-aligned double compressed JPEG images
N Dalmia, M Okade - Signal Processing: Image Communication, 2018 - Elsevier
This paper presents a novel method for first quantization matrix estimation for non-aligned
double JPEG compressed images. The non-aligned double JPEG scenario poses several …
double JPEG compressed images. The non-aligned double JPEG scenario poses several …