Image-processing-technology-based plane footprint detection and analysis system and method thereof

Abstract

The invention discloses an image-processing-technology-based plane footprint detection and analysis system and a method thereof. The system comprises an image processing subsystem used for extracting the footprint depth information of a source plane footprint image, and generating a target plane footprint image which carries the depth information. In such a way, by means of a computer system, the depth information in a restored plane footprint image is further analyzed to show a stress pressure, an abrasive surface, foot rising and falling and the like, reflecting the gait feature and the figure feature of a person, of a footprint; and specific indexes, such as the sex, the stature, the posture, the age, the step gait and the like, of a suspect are obtained by combining the footprint left on-site for performing contrastive analysis, and detecting aided with the functions such as butting, splicing, overlapping, gridding, measuring, feature marking and the like; therefore, the aims of reducing a screening object range and determining the identity of the suspect are fulfilled.

Description

technical field [0001] The invention relates to the field of trace detection of criminal investigation technology, in particular to a plane footprint detection and analysis system and method based on image processing technology. Background technique [0002] Footprints are the most traces and clues left at urban crime scenes, and they are also one of the common physical evidence at crime scenes. Although the discovery rate of footprints is high, there is a problem that the utilization rate is low and it is difficult to directly provide help for solving cases. [0003] Existing methods for extracting footprints to assist in solving crimes usually include plaster molding or laser light source irradiation to extract three-dimensional footprints. Among them, the three-dimensional footprints collected by the gypsum modeling method can only be manually measured and empirically analyzed in the inspection and appraisal. The method of extracting three-dimensional footprints by lase...

AI Technical Summary

Problems solved by technology

Among them, the three-dimensional footprints collected by the gypsum molding method can only be manually measured and empirically analyzed in the inspection and appraisal. Therefore, there are defects in the footprint inspection and appraisal that are difficult to ensure quantitative and scientific requirements

The method of extracting three-dimensional footprints by laser irradiation can realize the application of digital acquisition and quantitative measurement of on-site three-dimensional footprint information, but it needs professional equipment, such as CCD cameras, stepping motors, and optical projectors (including laser light sources). )Wait

Therefore, many criminal investigation units are limited by conditions, and most of the footprints extracted at the crime scene are planar (two-dimensional) photos / images, especially for the scene planar footprint photos / images that were kept in the file files of unsolved cases in the early years , since the depth information of the footprints cannot be directly obtained from the above-mentioned planar photos / images, and it is impossible to judge the deepest area and heavy pressure area of ​​the footprints, the planar photos as the first-hand information of the crime scene play an important role in the detection of the case. very limited

It cannot be used directly like stereoscopic footprint images obtained by advanced methods such as laser scanning

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