A Contrario Detection of H.264 Video Double Compression

Li, Yanhao; Gardella, Marina; Bammey, Quentin; Nikoukhah, Tina; Morel, Jean-Michel; Colom, Miguel; von Gioi, Rafael Grompone

doi:10.1109/icip49359.2023.10222775

Cited by 4 publications

References 33 publications

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A Contrario Mosaic Analysis for Image Forensics

Bammey

2023

Lecture Notes in Computer Science

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With the advent of recent technologies, image editing has become accessible even without expertise. However, this ease of manipulation has given rise to malicious manipulation of images, resulting in the creation and dissemination of visually-realistic fake images to spread disinformation online, wrongfully incriminate someone, or commit fraud. The detection of such forgeries is paramount in exposing those deceitful acts. One promising approach involves unveiling the underlying mosaic of an image, which indicates in which colour each pixel was originally sampled prior to demosaicing. As image manipulation will alter the mosaic as well, exposing the mosaic enables the detection and localization of forgeries. The recent introduction of positional learning has facilitated the identification of the image mosaic. Nevertheless, the clues leading to the mosaic are subtle and frail against common operation such as JPEG compression. The pixelwise estimation of the mosaic is thus often imprecise, and a comprehensive analysis and aggregation of the results are necessary to effectively detect and localize forged areas. In this work, we propose mimic: Mosaic Integrity Monitoring for Image a Contrario forensics. an a contrario method to analyse a pixelwise mosaic estimation. We show that despite the weakness of these traces, the sole analysis of mosaic consistency is enough to beat the state of the art in forgery detection and localization on uncompressed images. Moreover, results are promising even on slightly-compressed images. The a contrario framework ensures robustness against false positives, and the complementary nature of mosaic consistency analysis to other forensic tools makes our method highly relevant for detecting forgeries in high-quality images.

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A Contrario Mosaic Analysis for Image Forensics

Bammey

2023

Lecture Notes in Computer Science

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JADE OWL: JPEG 2000 Forensics by Wavelet Offset Consistency Analysis

Bammey

2023

2023 8th International Conference on Image, Vision and Computing (ICIVC)

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In a world teeming with digital images, the credibility of visual data has become of paramount importance. While it is now simpler than ever to manipulate an image for malicious purposes such as misinformation, the tools for detecting such alterations have predominantly been developed for either uncompressed or JPEG-compressed natural images. However, medical and satellite imagery, domains where the potential for fraud is high, often use a different compression format -JPEG 2000. We present a JPEG 2000 Anomaly Detection Estimator via Offset of Wavelet Localization -the Jade Owl -, a novel method for detecting forgeries in JPEG 2000 images by analyzing the consistency of traces left by its compression. Our technique hinges on the premise that the wavelet coefficients of a JPEG 2000 image are lower when the same offset is applied during the wavelet transform than they are when the offset is different. By employing this principle locally, we're able to detect regions with significantly different offsets, indicating potential forgeries such as copy-move. An accompanying a contrario model further refines this detection to make automatic detections while controlling false positives. To evaluate the method, we've created a unique dataset of JPEG 2000 forgeries. This novel approach significantly paves the way for JPEG 2000 image forensics, introducing a sensitive and efficient tool for authenticity verification in critical sectors such as healthcare and satellite imagery.

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One-Class HEVC Double Compression Detection with Same Coding Parameters

Zhao,

Ding

2024

2024 IEEE International Conference on Multimedia and Expo (ICME)

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A Contrario Detection of H.264 Video Double Compression

Cited by 4 publications

References 33 publications

A Contrario Mosaic Analysis for Image Forensics

A Contrario Mosaic Analysis for Image Forensics

JADE OWL: JPEG 2000 Forensics by Wavelet Offset Consistency Analysis

One-Class HEVC Double Compression Detection with Same Coding Parameters

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