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Three-dimensional footprint modeling and feature extraction method and system

A feature extraction and footprint technology, which is applied in the field of three-dimensional footprint modeling, feature extraction and systems, can solve problems such as analysis deviation of appraisers, problems in identity identification in footprint inspection, and destruction of three-dimensional footprint trace features.

Pending Publication Date: 2021-03-16
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The traditional three-dimensional footprint inspection is to analyze the plaster model by technicians, but this analysis method mainly relies on the subjective experience of the appraiser, and when making the plaster model, due to the technical level of the operator, it is likely that the trace characteristics of the three-dimensional footprint on the spot are in the The gypsum mold is destroyed, which leads to deviations in the analysis of the appraiser, which leads to problems in footprint inspection and identification

Method used

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  • Three-dimensional footprint modeling and feature extraction method and system
  • Three-dimensional footprint modeling and feature extraction method and system
  • Three-dimensional footprint modeling and feature extraction method and system

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] refer to figure 1 As shown, it is a flow chart of the preferred embodiment of the 3D footprint modeling and feature extraction method of the present invention.

[0068] Step S1, perform three-dimensional footprint modeling according to the barefoot footprint, and determine the coordinate system:

[0069] Determine the most convex point of the inner and outer edges of the palm area and heel area of ​​the footprint, determine the common tangent of the inner and outer edges, and form an angle α between the two common tangents and a point outside the heel, and make an angle according to the angle α formed by the two common tangents The bisector acts as the x-axis. The bisector of the angle intersects the rear edge of the heel and the front edge of the toe at points A and B respectively. Find the center point O between the two po...

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Abstract

The invention relates to a three-dimensional footprint modeling and feature extraction method, which comprises the steps of performing three-dimensional footprint modeling according to a barefoot footprint, and determining a coordinate system; and according to the determined coordinate system, in combination with a foot skeleton distribution structure, motion habit characteristics and barefoot footprint characteristics, performing morphological length characteristic extraction and regional relationship characteristic extraction on barefoot footprints respectively. The invention also relates toa three-dimensional footprint modeling and feature extraction system. According to the method, the problem of large deviation between the traditional artificial subjective experience inspection and the identification mode can be solved, and a basis is provided for accurate footprint inspection and identity authentication.

Description

technical field [0001] The invention relates to a three-dimensional footprint modeling and feature extraction method and system. Background technique [0002] Footprints are one of the main traces left on the scene of reconnaissance. Reconnaissance technicians can analyze the suspect's individual characteristics such as height, age, body shape and gender through the gait characteristics and stride characteristics reflected by the footprints on the scene. The remaining location determines the entrance, exit and location of the scene, and the number of suspects is determined according to the type of footprints, so as to provide clues and directions for investigation. [0003] Footprints carry two important characteristics of human physiology and behavior, and footprint identification plays an important role in criminal technology and other fields, and has accumulated rich expert experience. Footprint biometric identification and analysis has specific application advantages. Th...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06T7/13
CPCG06T17/00G06T2207/10012G06T7/13
Inventor 穆治亚何昕魏仲慧张磊何家维王军
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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