Device-class identification
Definition
Establishing that an image was captured by one of a set of cameras sharing the same sensor architecture and firmware, rather than identifying the specific physical unit. CFA analysis provides device-class identification; PRNU analysis provides individual-unit identification.
Related terms
- Brown-Conrady model
- The standard parametric model for camera lens distortion, using radial coefficients k1, k2, k3 and tangential coefficients p1, p2. Camera calibration tools...
- Colour filter array (CFA)
- A mosaic of spectrally selective filters placed over a camera sensor so that each photosite measures only one colour channel. The standard...
- Demosaicing
- The algorithm used to interpolate full-colour pixel values from the single-channel raw sensor data. Common methods include bilinear interpolation, gradient-based algorithms (AHD,...
- Frequency-domain CFA spectrum
- When a demosaiced image is transformed into the frequency domain (using a 2D DFT), the CFA interpolation introduces periodic peaks at spatial...
- Radial distortion
- A geometric lens aberration in which magnification changes with distance from the optical axis. Barrel distortion (negative radial coefficient k1) bows straight...
Explained in
- Lens Distortion, CFA Pattern and Demosaicing FingerprintsEstablishing that an image was captured by one of a set of cameras sharing the same sensor architecture and firmware, rather than identifying the specific phys...