What needs to be clarified
The task could assess comparability and distinguish persistent features from projection, facial expression and lighting. A detail missing from one frame should not be treated as an established difference without considering whether it could have been visible.
Materials to prepare
- Original photographs or a frame sequence with available capture information.
- Reference facial images in different positions and from the relevant period.
- Information about scale, cropping, mirroring and processing.
What to compare
- Head position and viewing direction in each image.
- Availability of the same facial areas and the effect of shadows, turning and expression.
- Whether an observed feature recurs in adjacent frames and reference photographs.
Possible outcome of the analysis
A possible output is a list of comparable features and areas limited by imaging conditions. Where evidence is insufficient, the need for different frames can be explained instead of giving a categorical answer based on one visual difference.
Limits of the conclusions
A change of angle does not automatically explain every discrepancy. Low resolution, severe turning or occlusion may prevent identification; enlargement alone does not create new reliable features.