Abstract:In order to solve the problem of dimensions measurement of large-scale complex objects, this paper proposes a method of large three-dimensional digital precision measurement. This method solves the complex conflict is about large work pieces with local space, according to the global measurement and measuring a combination of terminal. Firstly, this paper presents a handheld laser scanning method based on local spatial orientation and structured light measurement principle, building mathematical measurement model; secondly, this paper obtains the appropriate mathematical modeling process for the handheld space probe gesture; finally, we give a complete modular three-dimensional mathematical measurement model. The method can be used for the 3D precise measurement and reconstruction of various large-scale scene, provides an accurate theoretical basis for the 3D entity resource fast reconstructing digital model.