A portable multi-band light source three-dimensional on-site investigation and evidence collection instrument and evidence collection method

Abstract

A portable multi-band light source three-dimensional on-site investigation and forensics apparatus and forensics method, which relate to the field of criminal investigation and forensics equipment. The control chip is respectively connected to the light source scanning unit, the working mode switch, and the computer. The control program is transmitted to the light source scanning unit, which emits light of different bands, and the 3D image obtained by taking pictures is transmitted to the control chip, and then the 3D image is transmitted to the computer for storage and analysis. The object of the present invention is to provide a portable multi-band light source three-dimensional on-site investigation and evidence collection device and a forensic collection method, which are small in size and can obtain and record trace information that is invisible to the naked eye and invisible under conventional light sources.

Description

technical field [0001] The invention relates to the field of criminal investigation and evidence collection equipment, in particular to a portable multi-band light source three-dimensional on-site investigation and evidence collection instrument and a evidence collection method. Background technique [0002] Three-dimensional measurement is a high-tech integrating optical, mechanical, electrical and computer technologies. It is mainly used to scan the spatial shape, structure and color of objects to obtain the spatial coordinates of the object's surface. The significance of three-dimensional measurement is to convert the three-dimensional information of an object into a digital signal that can be directly processed by a computer, providing a very convenient means for the digitization of objects. [0003] On-site investigation is the inspection and investigation of the traces and other physical evidence left in the criminal place by the investigative agency. clues and eviden...

AI Technical Summary

Problems solved by technology

[0005] However, the current common 3D scene investigation equipment is a panoramic reconstruction equipment for large-scale case scenes. Although this equipment has a fast scanning speed, its scanning accuracy for small and irregular evidence is poor, especially for objects whose surfaces have been cleaned. Blood stains and other traces that are invisible under ordinary light cannot be scanned for evidence collection

Moreover, the large size of general 3D scene investigation equipment makes it difficult to move, and the structure is complicated so that it is difficult to operate, which does not meet the actual needs of investigators to obtain traces at the crime scene

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