Nteractive Designing And Viewing In A Mixed Virtual Reality Scene

Augmented Reality, AR, is also known as mixed reality. By computer technology, AR merge virtual information into real world, so that the real scene and the virtual objects occur in the same space. Virtual human’ path planning and the restoration of the light of the outside scene are two AR subjects, both need to add some virtual objects in real scene, so the virtual and the reality can be mixed.During the path planning of the virtual human, first we do feature tracking and extraction and the calibration of the cameras according to the video or image sequences, all these information should be visualized when virtual objects are added. Also, how to use interactive tools to determine the location of virtual objects in a3D scene easily, and complete a platform that can share resources with the platform for virtual human’s path planning, is a subject worthy of study.As the complement of the virtual human’s path planning issues, this paper designs a interactive platform of the mixed scene. The platform uses document view framework and technologies such as Direct3D and OpenCV. Firstly, it does the visualization of the feature points information and the camera’s parameter information; Secondly, it realized interactive controlling of virtual objects in both two-dimensional viewing mode and three-dimensional scene mode, including manual entry, mouse controlling and keyboard controlling; Thirdly, it has the ability to output accurate location information of objects in the scene.Inspired by the applications of Lie Algebra in computer vision, the paper raises a viewpoint interpolation algorithm based on Lie Algebraic representation. The algorithm transforms the viewpoint transformation matrix interpolation by affine space to the parameter space, interpolates in the parameter space, and then performs the parameter space to the transformation of the affine space and gets a series of interpolation of viewport. Compared with the simple interpolation in the affine space, the proposed algorithm results are smoother, with better interpolation results, and more explicit physical meaning.The main contributions of this paper are:(1) Completing a interactive platform for a virtual and reality mixed scene, and docking with other platforms;(2) Proposing a interpolation algorithm based on Lie algebraic representation to obtain a smooth interpolation of viewpoint, the algorithm can be used to browse scenes in the interactive platform.