Provide the sequence, rather than one selected frame
The recording may contain other head positions and moments when part of the face is more visible. The original video file and the relevant time interval are therefore useful. Selecting the most similar-looking frame without the remaining materials may conceal changes in viewing angle and image quality.
Prepare comparison images
Report the photographs' provenance, presumed date and known processing. Viewing angle, lighting and scale matter alongside the number of files. Images of the same person from widely differing periods and conditions require separate assessment of comparability.
Discuss which features are available
The specialist determines which elements of appearance are visible and may be used in comparison. An obscured area should not be filled in according to expectations. Neural-network image restoration likewise does not turn a generated detail into a feature of the person recorded by the camera.
What to prepare
- The original recording and the interval in which the person appears.
- Photographs at their available original quality.
- Information about viewing angle, lighting and known transformations.
- Comparison images with identifiable provenance.
- A precise question and information about the boundaries of the material submitted.
What to bear in mind
Partial visibility of a face neither automatically makes an image suitable nor automatically makes examination impossible. Whether a conclusion is permissible and how definite it can be depend on the combination of available features.
Outcome of preliminary preparation
Preliminary assessment helps determine the objects' suitability and whether other original frames are needed, without promising an outcome before examination.
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