Building three-dimensional laser point cloud feature extraction method based on assistance of three-dimensional laser scanning system/digital camera images

Abstract

The invention discloses a building three-dimensional laser point cloud feature extraction method based on the assistance of three-dimensional laser scanning system / digital camera images. A three-dimensional laser scanning system and a digital camera are adopted to obtain building three-dimensional laser point cloud data and obtain three-dimensional laser scanning system / digital camera high-resolution image data; building three-dimensional laser point cloud is precisely registered with three-dimensional laser scanning system / digital camera images, so that the corresponding relations of three-dimensional laser points and image pixels in the space can be obtained; an LSD (line segment detector) algorithm is adopted to carry out feature extraction on the image data, so that a building image feature graph can be obtained; feature extraction is performed on the building three-dimensional laser point cloud; optimization processing is performed on extracted initial three-dimensional laser point cloud features based on an RANSCA (random sample consensus) algorithm; and building three-dimensional laser point cloud features can be obtained. With the building three-dimensional laser point cloud feature extraction method of the invention adopted, the fine degree and accuracy of three-dimensional laser point cloud feature extraction can be improved, the construction of a building model can be favored, and more practical problems in the production field can solved. The method of the invention has a great theoretical reference value for the development of digital urbanization and the construction of a BIM (building information model).

Description

technical field

[0001] The invention relates to the field of three-dimensional laser point cloud data processing, and specifically refers to a method for extracting features of three-dimensional laser point cloud of buildings under the assistance of images on the same machine. Background technique

[0002] The 3D digital city is the trend of global informatization development of cities in the future, and has gradually become a research hotspot. In the construction of the digital city geospatial framework, the 3D digital city model is not only a novel and vivid highlight, but also the crystallization of technological sublimation. The building model in the city is a necessary step and one of the key contents of the digital city. In addition, as an emerging technology in the field of construction, the application of BIM (Building Information Model) technology in building information model reconstruction and management has also been gradually studied. The information in variou...

Images