Method for reconstructing arch structure by means of arch fossil
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A foot arch and fossil technology, which is applied in the field of reconstructing the foot arch structure from the foot arch fossil, can solve the problems of reducing the reliability of the reconstructed structure and the like
Active Publication Date: 2018-04-20
FUJIAN NORMAL UNIV
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However, due to the absence of the right inner cuneiform bone fossil, the reliability of the reconstructed structure is reduced
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Embodiment 1
[0077] A method for reconstructing arch structure of foot by arch fossils, comprising the following steps:
[0078] S1: A three-dimensional tomographic scan of the arch bone of a modern human is performed to obtain a tomographic image of the arch bone of a modern human. The arch bone of a modern human is the right arch bone;
[0079] S2: According to the obtained tomographic image of the modern human arch bone, three-dimensional reconstruction is performed on the modern human foot arch bone to obtain a three-dimensional model of the modern human foot arch bone, which includes 7 tarsal bones and 5 metatarsal bones;
[0080] S3: Store the obtained 3D model of the modern human foot arch bone in the form of point cloud;
[0081] S4: Calculate the centroid position of the modern human arch bone through the stored point cloud;
[0082] S5: Establish the first three-dimensional Cartesian coordinate system with the centroid of the modern human foot arch bone as the origin;
[0083] ...
Embodiment 2
[0097] The calculation principle of a method for reconstructing the arch structure of the foot from arch fossils is as follows:
[0098] Express the arch bones of modern humans as a collection of surface point clouds. Define a quantity: E=∫r 2 dp, E is Euler, dp represents the point cloud, r is the distance from the point cloud to the centroid of the arch bone of modern people. The arch bones of modern people rotate around the x→y→z axis in order.
[0099] Rotation around the x-axis;
[0100] The space Cartesian coordinate system passing through the centroid of the arch bone of modern people is expressed by oxyz, and the surface of the arch bone of modern people is composed of finite points, expressed by E x ,E y ,E z Represent the Euler moments for the x, y, and z axes, respectively.
[0101] The Euler moment of the arch bone of modern people is:
[0102]
[0103] The Euler product of the arch bone of modern people is:
[0104]
[0105] where dp represents the p...
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Abstract
The invention discloses a method for reconstructing an arch structure by means of an arch fossil. The method comprises the steps of: selecting a modern human, performing three-dimensional tomography and reconstruction on a right side arch of the modern human; saving a reconstructed arch bone in a point cloud form; defining Euler quantities including Euler, Euler moments, Euler products and Euler main axis, rotating the arch bone of the modern human according to specific sequences based on the quantities till all the Euler products are zero, and recording the rotating sequences and angle displacements of the arch bone of the modern human; and rotating an arch bone fossil according to specific sequences till all the Euler products are zero, then inversely rotating the arch bone fossil in thereverse direction according to the sequences and angle displacements of the arch bone of the modern human, and completing the reconstruction of the arch structure. The method disclosed by the invention provides a new approach for the human body structure reconstruction of a human fossil, and provides new evidence for interpretation of the evolution process of human.
Description
technical field [0001] The invention relates to the field of human archaeology, in particular to a method for reconstructing the arch structure of the foot from arch fossils. Background technique [0002] A 52-million-year-old fossilized talus suggests that our ancient ancestors may have been jumpers, not climbers. A piece of the 4th metatarsal allows us to know that about 3 million years ago, human ancestors gave up arboreal life and walked and ran on the savannah. And when the nearly complete Naledi arch bone fossils including 6 appendages and 5 metatarsal bones on the right were displayed in front of our eyes, countless scientists were excited. Regrettably, the right medial cuneiform bone fossil of Homo Naleti is missing. Although the morphological analysis of the metatarsal head found that Homo Naleti had a foot arch, the reconstructed medial longitudinal arch is not obvious. See figure 1 . This may be true, but it may also be due to the reconstruction method. [000...
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