Indoor Scene Footprint Extraction Technology Based On Scanning Imaging Principle

The scene footprints are the footprints lefted at a crime scene by suspect.The site footprint refers to the footsteps or footwear left at the crime scene when the suspect is committing a crime.As the incidence of crime is increasing,the extraction and analysis of the crime scene is becoming more and more important.The site footprint is evidence of a high value for criminal cases.Through the processing and analysis of the site footprint,we can infer the basic information of the suspect and some personal habits,such as gender,height,weight,walking gait,etc.,which in the detection process can narrow the scope of the investigation,or even So that the tracing of criminal suspects,is conducive to the rational distribution of police and truly targeted.In view of the universality of the site footprint and its conditions and objective conditions,how can the effective investigation of the footsteps of the crime scene,identification,extraction is particularly important,but also many aspects of the first step.At present in the field of criminal investigation to extract the site footprint,the general use of strong police light irradiation with light,and then through the camera to take pictures.This approach depends on manual operation,and the operation cumbersome,time-consuming and laborious.The following defects: 1,the imaging environment is affected by the ambient light;2,some of the footprint can not be identified in the vertical direction,but if the use of camera tilt camera,you can not avoid the image distortion caused by tilting imaging;3,imaging quality is affected by the background of the stripes and patterns,especially for the color on the back of the footprint,it is difficult to clear imaging;4,due to the uneven light source image uneven brightness,poor image quality.5,the captured footprint image is largely limited by the technical level of the operator,but also may be affected by device jitter and other factors.The above problems have seriously affected the extraction of footsteps and image quality,making the follow-up part of the criminal investigation work to a certain degree of obstacles.In this paper,a new type of site loading is designed,which is based on the working principle of grazing incidence and scanning imaging,and realizes the effective extraction of the footprint image.Compared with the prior art,it has the following advantages: 1.It is effective to ensure the influence of ambient light and the quality of imaging when scanning imaging.2,effectively ensure the accuracy of imaging because of the use of scanning imaging Way,so to avoid the conventional camera mode caused by the footprint image oblique deformity,to ensure the true situation of each part.3,the use of a bar-line polarized light beam grazing incident light distribution,while ensuring that the scanning imaging unit to receive the light out of the direction of the footprint close to the footprint,to ensure a clear footprint.4,scanning imaging light source front and footprint diffuse light receiving end are equipped with linear polarizer,increasing the imaging footprint and background contrast.In this paper,the design and development of the site footprint extraction device can effectively extract the scene footprint images,for the detection of the case to provide valuable information and help,with high practical value.