The 3D analysis software is used by forensic experts in the office. Once the data from the 3D-scanner has been uploaded to the analysis software in a first step it is prepared for the subsequent analysis step. Different shading variants are calculated which are later used to emphasize marks in the 3D-data. Optionally, if an impression was larger than the single field of view of the scanner, such as from a tyre, then multiple scans can be “stitched” together with a cloud to cloud registration process (Fig. 5).
In a further step the high resolution colour data is mapped onto the 3D data (Fig. 6).
The integrated 3D measurement and colour data can then be analysed with the software to investigate characteristics of the footwear and tyre impressions. Class characteristics are determined by the user through comparing the impression with images from manufacturers’ or other databases. Individual identification characteristics such as holes and tears can be marked by the user with an annotation tool. Further tools allow the comparison of footwear and tyre impressions with suspects’ shoes and/or vehicle tyres and other crime scenes. Two 3D-scans can be presented in two opposite windows. The user can move and zoom through both scans to identify similarities or differences (Fig. 7).