Colour filter array (CFA)
Definition
A mosaic of spectrally selective filters placed over a camera sensor so that each photosite measures only one colour channel. The standard Bayer pattern arranges filters as RGGB in a 2x2 tile; other layouts include Sony's RGBE (with an emerald filter) and Fujifilm's X-Trans 6x6 pattern.
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...
- 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,...
- Device-class identification
- Establishing that an image was captured by one of a set of cameras sharing the same sensor architecture and firmware, rather than...
- 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 FingerprintsA mosaic of spectrally selective filters placed over a camera sensor so that each photosite measures only one colour channel. The standard Bayer pattern arrang...