A virtual-real entity coordinate mapping method and system for building digital twins

Abstract

The present application provides a virtual-real entity coordinate mapping method and system for building digital twins, the method comprising: determining the position coordinates of the target entity object in the pixel coordinate system; when the target entity object is detected to be located outside the spatial reference plane, Obtain the first plane image belonging to the spatial reference plane and the second plane image belonging to the target space plane from the image frame to be processed; use the real space between the first plane image, the second plane image, the target space plane and the space reference plane height to construct a three-dimensional space model; according to the coordinates of the first position, the coordinates of the upper intersection point and the coordinates of the lower intersection point are respectively obtained from the three-dimensional space model; between the pixel coordinate system and the virtual space world coordinate system, the coordinates of the upper intersection point and the lower intersection point coordinates are respectively Perform coordinate transformation to obtain the real coordinates of the target entity object in the model. In this way, the present application can improve the positioning accuracy of the target entity object and the realism of the entity building scene in the model.

Description

technical field [0001] The present application relates to the technical field of architectural digital twins, in particular, to a virtual-real entity coordinate mapping method and system for architectural digital twins. Background technique [0002] Digital twin refers to making full use of data such as physical models, sensor updates, and operation history, integrating multi-disciplinary, multi-physical quantities, multi-scale, and multi-probability simulation processes, and completing the mapping in the virtual space to reflect the entire life of the corresponding physical equipment. cycle process. Among them, architectural digital twin refers to that in the application scene of engineering construction, in order to display the spatial layout structure of the target physical building more intuitively and clearly, the engineering construction personnel usually construct a physical model that can reflect the target physical building after the target physical building is comp...

AI Technical Summary

Problems solved by technology

[0004] In the current image target detection method, the camera extrinsic calibration results are used to complete the coordinate conversion function of the position coordinates between the camera coordinate system and the virtual space world coordinate system. However, the conventional camera extrinsic calibration results are only applicable to ground The solid object on the ground is positioned, and the solid object located on other planes with a certain height from the ground may be detected as the texture information of the ground, resulting in the loss of the spatial volume information of the entity during the image detection process, thus causing the When the class entity performs entity positioning, the positioning result will be offset, making the accuracy of the entity positioning result low, and the model information in the constructed / updated digital twin model will be distorted

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