The following guidance applies to all footage sent for analysis. We appreciate that it is not always possible to meet all of the criteria listed below, but every effort should be made wherever possible.
The footage should show the subject:
undertaking as many consecutive steps as possible
from as many angles as possible
wearing normal footwear
Please ensure that:
the footage will play as sent on any PC or laptop
where the footage relies on proprietary software, clear instructions are submitted in conjunction with the footage
the footage submitted is limited to the relevant sections of the recordings
the footage is of as higher frame rate as possible
the footage is accompanied by short explanatory notes confirming the subject of interest and the timings at which they appear in the footage
Where the reference footage does not already exist, please attempt to ensure that:
the camera to subject angle is matched as closely as possible to that of the questioned footage
the subject’s walking speed is matched as closely as possible to that of the questioned footage
the frame rate is at least 8 frames per second or higher
there is a clear line of sight between the camera and subject throughout
the area where the image is to be captured is well lit, shadow free and without reflection interference
the image is not grainy and has good contrast
the whole of the body is in shot for as many steps as possible
the subject is wearing clothing that allows a clear view of foot and lower limb movement
the subject is wearing their shoes
There may be specific occasions on which these criteria need to vary in order to gain as close a match of the reference footage with the questioned footage.
Guidance developed in collaboration with Professor Wesley Vernon
Forensic Podiatry Unit, Podiatry Service
Sheffield Teaching Hospitals NHS Foundation Trust