Reference profile
Definition
A database of known parameter values built from recordings made with the suspect device under controlled conditions. Comparison of the questioned video against the reference profile is the core analytical step in source camera matching.
Related terms
- Bitrate profile
- The pattern of bitrate variation across time in a variable-bitrate recording. A camera's rate-control algorithm allocates more bits to complex scenes and...
- Codec fingerprint
- The characteristic pattern of encoding decisions made by a camera's firmware when compressing video: the specific H.264 or H.265 profile and level,...
- Colour pipeline
- The sequence of transformations applied to raw sensor data to produce the encoded video signal, including white balance, gamma curve, colour space...
- GOP (Group of Pictures) structure
- The pattern of I-frames, P-frames, and B-frames in a compressed video stream. Different cameras use different GOP lengths and frame-type ratios, which...
- PRNU (Photo Response Non-Uniformity)
- The unique pattern of pixel-level sensitivity variations in a camera sensor, used as a device fingerprint. A genuine camera-original image carries the...
Explained in
- Matching Video to a Source CameraA database of known parameter values built from recordings made with the suspect device under controlled conditions. Comparison of the questioned video against...