Stature Estimation Uncertainty
Definition
The combined error from pixel localisation, reference height knowledge, positional correction accuracy, and camera model assumptions, expressed as a confidence interval at a specified probability level (typically 95%).
- Typical confidence level
- 95%
- Error sources
- Pixel localisation, reference height, positional correction, camera model
- Reported as
- A stature range, not a single value
- Application
- CCTV-based photogrammetric height estimation
Common questions
Why does CCTV stature estimation give a range instead of one number?+
Several independent error sources compound, including how precisely the subject's head and feet were located in the frame, how well the reference object's true height is known, and how accurately the camera's lens distortion and perspective were modelled, so the honest result is a range at a stated confidence level.
Which error source usually dominates the uncertainty?+
Pixel localisation error is often the largest contributor when the subject is small in the frame or the footage is low resolution, since even a one or two pixel difference in head or foot position translates to several centimetres of height error at typical CCTV distances.
Related terms
- Ground-Plane Calibration
- A physical survey of the scene after the event, measuring reference points on the floor relative to the camera position, allowing the...
- 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,...
- 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...