Ground-plane calibration
Definition
A physical survey of the scene after the event, measuring reference points on the floor relative to the camera position, allowing the analyst to model the camera geometry precisely and correct for tilt and perspective in the recorded footage.
Related terms
- Perspective distortion error
- The apparent change in size of objects at different distances from the camera due to projective geometry. A person closer to the...
- Pixel height ratio
- The number of pixels occupied by a vertical extent (person, door, markings) in the image. Ratios between subject and reference pixel heights...
- Reference-object method
- Height estimation by measuring the pixel heights of both the subject and a reference object of known stature in the same frame,...
- Stature estimation uncertainty
- The combined error from pixel localisation, reference height knowledge, positional correction accuracy, and camera model assumptions, expressed as a confidence interval at...
- Vanishing-point method
- Using the vertical vanishing point and two horizontal vanishing points to compute the camera's effective viewing geometry, then projecting the person's image...
Explained in
- Height Estimation from CCTV FootageA physical survey of the scene after the event, measuring reference points on the floor relative to the camera position, allowing the analyst to model the came...