Исследование обстоятельств выстрела с помощью метода трехмерной фотограмметрии

Abstract

Introduction. A promising direction in forensic practice is the use of three-dimensional modeling of objects to establish the circumstances relevant to the criminal case. Theoretical analysis. Photographs taken during the investigation could be used as a source of information to derive a three-dimensional model. Photogrammetry is a method that allows for the automated construction of three-dimensional models from images. The main data in three-dimensional photogrammetry should be the elements of external and internal orientation, coordinates in the photograph, and spatial coordinates. Еmpirical analysis. To build a three-dimensional model, photos from the crime scene submitted for forensic firearm examination were used to determine whether the situation described by the accused, suspect, corresponded to the objective mechanism of the accident. The main stages of model building in 3D photogrammetry software Agisoft Metashape were reflected. Based on the procedural documents submitted for examination, the three-dimensional model reflected the alleged location of the shooter and the victim, and the direction of the shots from the defendant’s words, as well as the likely direction of the shots in accordance with the wound channels and the situation. Discussion of results. There are essential advantages of three-dimensional photogrammetry: it does not require expensive and complex equipment, operates with photographs obtained during the investigation, constructs the whole area of an object in the frame, and allows for synthesizing data from various sources. However, the quality of the resulting models depends on the number of photographs and compliance with the rules of measurement and panning of objects. It is also important that the researcher skilled in the use of software tools to build three-dimensional models from photographic images is able to make adjustments at each stage. Conclutions. The possibility of producing a three-dimensional reconstruction of the crime and solving problems not only within forensic firearm examination, but also those kinds, with which it can be combined, is reflected.