Stockpile of material
Identifying the victims of child pornography crimes involves tactical investigation and therefore time. Yet the extensive amount of digital material that the police need to investigate means time is often limited.
However, a considerable amount of child pornography material has already been classified by various regional police forces. This material should not need to be viewed again – not only is this time consuming, it is also emotionally stressful for investigators.
Time saving
ZiuZ Twin Match compares videos from confiscated material to previously classified material. Initially, videos are matched using hash values. Although matching using MD5 checksums works well, video material can be changed in such a way that the hash value also changes. For instance, it may be cut, reduced in size, or have subtitles or a logo added. Extracts from a video are also seen as a new video in terms of hash values.
TwinMatch therefore takes matching a step further by analysing the video DNA using an algorithm developed by ZiuZ. This DNA, or video fingerprint, enables new material to be automatically compared with previously classified material from a reference database.
ZiuZ TwinMatch is an add-on module for the VizXview Enterprise Edition, and seamlessly integrates into the investigation process. When a case is created and the confiscated material added as data, TwinMatch can start automatically classifying recognised material against the reference database. The robust algorithm detects video fragments as short as 3 seconds in the reference database. After matching, the remaining stockpile is most probably completely new material.