Photo-Anthropometric Overlay
Definition
A technique that aligns and scales two facial images and computes proportional distances between anatomical landmarks, used when direct feature comparison is constrained by pose or resolution.
- Field
- Forensic facial image comparison
- Method
- Alignment and scaling of two facial images
- Measured output
- Proportional distances between anatomical landmarks
- Used when
- Direct feature comparison limited by pose or resolution
Common questions
Why use proportional distances rather than absolute measurements between two photos?+
Absolute distances change with camera distance and lens, but proportions between landmarks on the same face stay relatively stable across images taken at different distances, which makes ratio-based comparison more dependable across mismatched photographs.
What limits does this overlay technique still have even with scaling correction?+
Pose differences beyond simple scaling, such as head tilt or rotation, can distort landmark positions in ways that scaling alone cannot fix, so results are treated as supportive rather than as a standalone identification method.
How does this differ from full photo-skull superimposition?+
This overlay compares two facial photographs of living or imaged faces to each other, while photo-skull superimposition compares a facial photograph against a skull image for identification of skeletal remains, a different evidentiary purpose.
Related terms
- Conclusion Scale
- The structured verbal scale recommended by FISWG, ranging from Exclusion through Inconclusive to Identification, used to communicate the weight of facial comparison...
- Facial Mapping
- The term used primarily in the UK and Australia for the forensic comparison of facial images. Now largely superseded in international literature...
- FISWG
- The Facial Identification Scientific Working Group, a US-originated but internationally engaged body that produced guidelines for forensic facial comparison, including a standardised...
- Holistic Assessment
- Evaluation of the face as an integrated whole rather than as a sum of parts, drawing on the examiner's trained perceptual processing...
- Morphological Analysis
- The systematic comparison of qualitative facial feature shapes from a standardised feature list; the primary method in ENFSI BPM facial image comparison,...