Ancient cultural relic three-dimensional model change detection method using contour line extraction and four-dimensional surface fitting

A technology of surface fitting and three-dimensional model, which is applied in the field of surveying and mapping science and can solve the problem of lack of three-dimensional information.

Active Publication Date: 2020-02-25
WUHAN UNIV
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Problems solved by technology

[0004] At present, there are many transformation detection methods using plane information of two-dimensional images on the m...

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  • Ancient cultural relic three-dimensional model change detection method using contour line extraction and four-dimensional surface fitting
  • Ancient cultural relic three-dimensional model change detection method using contour line extraction and four-dimensional surface fitting
  • Ancient cultural relic three-dimensional model change detection method using contour line extraction and four-dimensional surface fitting

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[0077] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0078] With the rapid development of computer technology, computers have been used more and more deeply in more and more industries. Using computer technology to effectively protect and study ancient cultural relics is of great significance to promote the rescue and protection of major cultural relics and archaeological projects.

[0079]The embodiment of the present invention uses contour line extraction and four-dimensional surface fitting to detect the change of the three-dimensional model of ancient cultural relics. Input the LiDAR point cloud data of ancient cultural relics in different perio...

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Abstract

The invention discloses an ancient cultural relic three-dimensional model change detection method using contour line extraction and four-dimensional surface fitting. The method comprises the followingsteps: registering LiDAR point cloud data sets of an ancient cultural relic in two different periods; re-classifying the LiDAR point cloud data to generate a LiDAR point cloud model; obtaining contour points of the LiDAR point cloud model according to a contour point rapid calculation algorithm based on Gaussian sphere parallel projection; sequentially using a minimum spanning tree algorithm, a short edge pruning method and a smoothing technology to obtain a smooth point cloud contour line; carrying out discrete degree screening on the extracted point cloud contour lines, removing noise features in the point cloud contour lines, and obtaining contour feature maps in two periods; performing feature comparison on the screened contour feature map to obtain a comparison result; and screeningthe obtained comparison results to obtain difference characteristics. The method makes full use of the superiority of LiDAR point cloud data, has the characteristics of short period, low cost, high precision, short updating time and the like, and can ensure the precision of a final result.

Description

technical field [0001] The invention relates to the field of surveying and mapping science and technology, in particular to a method for detecting changes in three-dimensional models of ancient cultural relics by using contour line extraction and four-dimensional surface fitting. Background technique [0002] Data sources for change detection include orthophotos, remote sensing images, and LiDAR point cloud data. Among them, the acquisition of LiDAR point cloud data is not affected by environmental factors such as seasonal weather and light. At the same time, the cycle of data acquisition is short, the cost is low, the accuracy is high, and the data is updated quickly. It is a good data source for three-dimensional transformation detection of the surface of ancient cultural relics. But the lack of texture information is a serious shortcoming of LiDAR point cloud data. Therefore, obtaining the contour features of the object surface through a series of algorithms such as fast...

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Application Information

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IPC IPC(8): G06T7/00G06T7/33G06K9/46
CPCG06T7/0002G06T7/33G06T2207/10028G06V10/443Y02A90/10
Inventor 孟庆祥王文蕊
Owner WUHAN UNIV
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