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Benedikt Lorch, M. Sc.

PhD candidate in the multimedia security group and member of the research training group Cybercrime and Forensic Computing. My research interests include image forensics, computer vision, and machine learning.

Recent projects

Image forensics from chroma wrinkles

Image splicing localization where both host and donor contain the artifact, however, the artifacts in the inserted region are desynchronized with the host.

This work presents a novel artifact that can be used to fingerprint the JPEG compression library. The artifact arises from chroma subsampling in one of the most popular JPEG implementations. Due to integer rounding, every second column of the compressed chroma channel appears on average slightly brighter than its neighboring columns, which is why we call the artifact a chroma wrinkle. We theoretically derive the chroma wrinkle footprint in DCT domain, and use this footprint for detecting chroma wrinkles.
Paper | Slides

Forensic reconstruction of severely degraded license plates

Low-quality image of South Carolina license plate on car rear. The low resolution and the presence of additive noies make it nearly impossible to decipher the license number.

Forensic investigations often have to contend with extremely low-quality images that can provide critical evidence. Recent work has shown that, although not visually apparent, information can be recovered from such low-resolution and degraded images. We developed a CNN-based approach to decipher the contents of low-quality images of license plates.
Paper | Slides | GitHub

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PGP

Key ID D7994F61EECD8C75
SHA-1 Fingerprint 1781 F23E FB55 50E6 BA75 ED4E D799 4F61 EECD 8C75
Public Key ASCII-armored

Publications

2019

2017

2015