Three-dimensional craniofacial reconstruction method based on overall facial structure shape data of Chinese people

Abstract

The invention discloses a three-dimensional craniofacial reconstruction method based on the overall facial structure shape data of Chinese people, comprising the following steps of: (1) acquiring a thickness distribution model of a facial soft tissue based on the statistic analysis of a large amount of human head CT (Computed Tomography) data; (2) unfolding the soft tissue layer and the skull surface layer of a human head through a cylinder, and projecting the soft tissue layer and the skull surface layer to a two-dimensional flat surface, representing the soft tissue shape and the skull shape by using a two-dimensional depth map, and training a radial basis function network to realize the change between the skull to be reconstructed and the common soft tissue thickness distribution form; (3) constructing a shape subspace of local organs of the reconstructed face based on the craniofacial facial structure shape classification of human species, and learning the mapping between the craniofacial local shape and the local shape of the reconstructed face; (4) correcting the reconstructed face model by combining the integral soft tissue distribution and the local characteristic shape deformation, i.e. completing three-dimensional craniofacial reconstruction and correctness of the input skull by adding the two-dimensional depth maps of the soft tissue shape and the shape of the skull to be reconstructed; and (5) synthesizing a complete texture graph of the face through facial texture mapping by using orthogonal pictures, and rendering the skin color and the hair style of the reconstructed human picture to enhance the reality sense of the human picture. By applying the method, the problems of missing reconstruction details and lack of individual characteristics are solved, the manufacturing cost of other anthropology researches and reconstruction technologies is saved, and the working efficiency is improved. The invention has high automation degree and simple operation.

Description

technical field [0001] The invention relates to a three-dimensional craniofacial reconstruction method in the fields of forensic anthropology and computer graphics, in particular to a three-dimensional craniofacial reconstruction method based on Chinese comprehensive facial structural shape data. Background technique [0002] For a long time, in terms of criminal investigation applications, craniofacial reconstruction has been the main method to solve the problem of finding the source of mutilated and ossified corpses, and it is an important criminal technology to break through difficult cases. The traditional Gerasimov sculpture restoration method uses the artificial sculpture method combined with the soft tissue thickness data of the head and face for restoration. At present, the domestic restoration work basically uses the average value of the soft tissue thickness data published in previous literatures for restoration work, and does not consider cranial Surface structure...

AI Technical Summary

Problems solved by technology

However, the human face has parts with complex physiological structures, some of which cannot be reflected on the bones, and the reconstruction results obtained directly through a few feature points and the general model are usually rough, lacking the personality of the human face, and reaching Without the conditions of portrait recognition, it loses the significance of investigating the identity of the deceased

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