the forensic institute

Student Projects: The Forensic Institute Research Network (FIRN)

Visual thresholds of image usefulness in fingerprint compression

Fingerprint identification has been around for a long time now, and naturally a lot of research has been done on what file format should be used, and if compression used, what type and what compression ratio. Most previous studies have based their conclusions on image quality metrics like Peak Signal to Noise Ratio to determine if the compression is not degrading the images too much. These previous studies have set the compression ratio to 16:1. This study will use a psychovisual experiment (paired comparison method) to determine what compression ratio can be used. The difference between this and the previous experiments is that observers (fingerprint experts) will be asked to judge whether the images are useful for matching and not whether they can see the compression artefacts. What this will give is a threshold of usefulness not a threshold of when artefacts start appearing. We believe that the compression ratio result will be higher than 16:1

Nicolas Geades, John Smith, Sophie Triantaphilidou. School of Media, Art and Design. University of Westminster.

Oral presentations

Cognitive style, processing sets and face recall >>

The Scanning Kelvin Probe (SKP) for the visualisation of fingerprints on metal surfaces >>

Investigation into the user of parallel processing techniques to speed up file carving using Graphical Processing Units (GPUs) >>

Assessment of the validity of using pigs as a model for humans in forensic entomology studies >>

Chemical processes at fingerprint-metal interfaces >>

Determination of visual thresholds of image usefulness in fingerprint compression >>

The use of ion beams for forensic analysis >>

General purpose graphics processing units in security >>

An investigation into the use of dehydration as a method of preserving dna in biological forensic samples >>

Real world detection of cocaine at the picogram level in an urban environment >>