Positioning of persons or skulls for photo comparisons using three-point analyses and one-shot 3D photographs

摘要

To reliably perform photocomparisons of heads or skulls, it is important to position the head or skull corresponding to the posture of the head on the photograph. An explanation is given of the three-point analysis as a tool for positioning. This three-point analysis, taken from the head on the photograph, allows us to position heads or skulls in front of a camera corresponding to those points of the head on the photograph. A 24 $MUL 36 mm camera with the three-point analysis within the viewfinder appeared to be suitable. This method was developed because the performance of photo comparisons on living persons in different surroundings, and the necessity for multiple comparisons per person demanded easier to handle equipment and a simplified positioning method. A novelty is bringing this three-point analysis into a computer, and using it together with a digitized one-shot movable 3D photograph of the head or skull of a person. Some experiences about working with such a 3D photograph will be discussed. The 3D technique used, was developed by scientists of the Roman Catholic University of Leuven, Belgium.