Method for Orthophoto Generation of Cylindrical Cultural Relic Objects

A technology of orthophoto and cylinder, which is applied in the field of orthophoto generation of cylindrical cultural relic objects, can solve problems such as double-degree overlap and stitching gaps, and achieve the elimination of stitching gaps, increase the number of point pairs, and solve the problems of double-degree overlap Effect

Active Publication Date: 2017-07-07
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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AI Technical Summary

Problems solved by technology

It can not only quickly and accurately generate orthophoto images of cylindrical or roughly cylindrical objects, but also solve a series of problems such as double-degree overlap and splicing gaps when cylindrical or cylindrical-like point clouds generate orthophotos , to generate a full-cylindrical, high-precision cylindrical unfolded planarized orthoimage

Method used

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  • Method for Orthophoto Generation of Cylindrical Cultural Relic Objects
  • Method for Orthophoto Generation of Cylindrical Cultural Relic Objects
  • Method for Orthophoto Generation of Cylindrical Cultural Relic Objects

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0049] like figure 1 As shown, the method for generating an orthophoto of a cylindrical cultural relic object includes:

[0050] Step 1. Data collection: the object to be tested can be a whole cultural relic or a component part of the whole cultural relic, and the shape of the object to be tested is cylindrical or roughly cylindrical; object;

[0051] Use the ground lidar to collect the point cloud (laser point cloud) of the object to be measured, figure 2 is the laser point cloud of the object to be measured, and the laser point cloud is located in the coordinate system of the ground lidar instrument. The axis is vertically upward and perpendicular to the Y axis, the X axis is perpendicular to the YOZ plane, and its positive direction is determined by the right-hand spir...

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Abstract

The invention discloses an orthoimage generation method of a cylinder-like antique object. The method comprises the following steps: acquiring a point cloud and a close-range image of a to-be-detected object; allowing the point cloud to generate a cylinder reference surface and acquiring a cylinder regular grid point cloud; selecting an image control point on the close-range image, selecting a homonymy point of the image control point on the cylinder regular grid point cloud and acquiring the attitude angle and shooting central point of the close-range image; determining a gravity center point of the image control point on the close-range image and converting the coordinate system of the gravity center point; determining the corresponding scope of the close-range image on the cylinder regular grid point cloud; generating a plurality of local orthoimages of the to-be-detected object; and expanding the local orthoimages into an integral orthoimage of the to-be-detected object. The method provided by the invention can highly efficiently generate the orthoimage of a cylindrical or substantially cylindrical object and overcomes a series of problems like dual-porosity overlapping and joint gaps of orthoimages generated by cylindrical or cylindrical-like point clouds.

Description

technical field [0001] The invention relates to the technical fields of photogrammetry and laser radar, in particular to a method for generating an orthographic image of a cylindrical-like cultural relic object. Background technique [0002] Digital orthophoto has the characteristics of true color, rich information, high precision, measurability, and no projection deformation. It occupies an important position in the fields of 3D reconstruction of cities and terrains, and digital protection of cultural heritage. At present, the orthophoto map can be divided into ground and urban orthophoto images based on aerospace photography, airborne LiDAR system, vehicle-based LiDAR system, station-mounted LiDAR system, and close-range photogrammetry system objects according to the carrying platform and the subject. For elevation orthophotos, since the objects are all plane or quasi-planar objects, the reference planes of these orthophotos are mainly planes. With the continuous deepenin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/00
CPCG01C11/00
Inventor 胡春梅张旭夏国芳李天烁
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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