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Cultural relic fragment splicing method and system, medium, equipment and terminal

A technology of debris and cultural relics, applied in the field of 3D point cloud registration, can solve the problems of cultural relics destruction, high degree of subjective experience, cumbersome manual movement, etc., and achieve strong robustness

Pending Publication Date: 2022-07-12
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a splicing method, system, medium, equipment and terminal of cultural relic fragments, especially relates to a method, system, medium, equipment and terminal for automatic splicing of damaged cultural relic fragments based on geometric characteristics of fracture surfaces. The terminal is designed to solve the problem of secondary destruction of cultural relics due to the high degree of subjective experience of experts and cumbersome manual movement in the existing technology

Method used

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  • Cultural relic fragment splicing method and system, medium, equipment and terminal
  • Cultural relic fragment splicing method and system, medium, equipment and terminal
  • Cultural relic fragment splicing method and system, medium, equipment and terminal

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Embodiment 1

[0083] The samples of the Terracotta Warriors fragments of the present invention are three-dimensional point cloud data. Referring to FIG. 5, feature extraction is performed for each three-dimensional point cloud fragment. In the first extraction process, the curvature and normal vector of the points on the fracture surface of the fragment are first calculated, and the normal vector is calculated. Calculate the mean value of the inner product δ and calculate the Euclidean distance variance S between each point in the neighborhood and the neighborhood fitting plane L, and combine the above geometric features to define the neighborhood feature parameters Among them, N is the number of sampling points, and η is a balance parameter introduced to balance the large difference between the neighborhood curvature ε and the Euclidean distance variance S. Since the neighborhood curvature ε is affected by the estimated value, there will be non-feature points in the extracted feature point ...

Embodiment 2

[0091] The fragment data of the Terracotta Warriors in this embodiment is three-dimensional point cloud data, and the following describes the fragment data as three-dimensional point cloud data. The fragment data of the Terracotta Warriors used in the present invention is obtained by scanning with a three-dimensional scanner, and the fragment data is denoised and redundant, and the data is simplified. splicing effect display, such as Figure 9 , 10 shown. Due to the influence of natural and human factors, most of the fragments of the Terracotta Warriors and Horses are defective. For slightly damaged models, the algorithm of the present invention can well realize splicing, such as Figure 9 shown; for models with severe defects, such as Figure 10 As shown, the algorithm of the present invention also has strong robustness and accuracy, and the splicing result is basically not affected by it. The following are the specific implementation steps:

[0092] The first step is t...

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Abstract

The invention belongs to the technical field of three-dimensional point cloud registration, and discloses a cultural relic fragment splicing method and system, a medium, equipment and a terminal, and the method comprises the steps: defining fragment model neighborhood feature parameters, extracting fracture surface feature points, constructing curvature feature parameters according to a least square method principle, and carrying out the optimization of a feature point set; defining a relative distance and a relative included angle between the feature points as feature descriptors, performing similarity measurement on the feature points according to a set similarity theory, and extracting a fracture surface feature point pair matching set; eliminating mismatching point pairs by using a random sampling consistency algorithm, and screening out an optimal matching set; a singular value decomposition method is adopted to calculate a rotation and translation matrix, and accurate splicing of fragments is realized by using an improved iterative nearest point algorithm based on a K-D tree. The method is convenient to operate, high in automation degree and high in robustness, and the fragment splicing accuracy and efficiency are effectively improved; the time is prolonged by 26-40% compared with that of a traditional algorithm; and the splicing error is reduced by 4-25% compared with that of the traditional algorithm.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional point cloud registration, and in particular relates to a method, system, medium, equipment and terminal for splicing cultural relic fragments. Background technique [0002] At present, the digital virtual splicing technology of cultural relics can divide cultural relics into thin-walled cultural relics and non-thin-walled cultural relics according to the thickness characteristics of cultural relics. Cultural relics with no or negligible thickness characteristics, such as murals, pottery and porcelain, are usually classified as thin-walled cultural relics; there have been a lot of studies on the splicing of thin-walled cultural relics. Cultural relics with thickness characteristics such as stone tablets and fragments of Qin terracotta warriors are usually classified as non-thin-walled cultural relics. The stitching of cultural relic fragments is an important application field of 3D point...

Claims

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Application Information

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IPC IPC(8): G06T7/33G06T17/20
CPCG06T7/337G06T17/20G06T2207/10028Y02P90/30
Inventor 耿国华张鹏飞李康刘泽华周明全
Owner NORTHWEST UNIV
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