Shared device model
Definition
The scenario in which multiple individuals use the same camera. The PRNU fingerprint links an image to the device, not to any individual user, so device sharing creates an attribution gap between camera and person.
Related terms
- Anti-forensic PRNU suppression
- Deliberate actions to remove or obscure the PRNU fingerprint, such as adding PRNU-erasing noise, applying heavy lossy compression, or scaling and re-cropping...
- Base rate problem
- The statistical challenge facing any deception-detection method: if only a minority of statements examined are actually deceptive, even a method that is...
- Individual vs. device-class attribution
- Individual attribution identifies one specific camera body. Device-class attribution identifies only the make or model. PRNU provides individual attribution; metadata and lens-distortion...
- PRNU suppression
- Any processing that reduces the usable PRNU signal in an image: heavy JPEG compression, resolution downscaling, in-camera noise reduction, social-media re-encoding, and...
- Uncertainty quantification in PRNU
- Expressing a PRNU attribution result not just as a binary yes/no but with stated PCE values, false-positive rate at the threshold used,...
Explained in
- PRNU in Casework: Limitations and ReportingThe scenario in which multiple individuals use the same camera. The PRNU fingerprint links an image to the device, not to any individual user, so device sharin...