| Visual media includes images, video, digital geometry, etc. As one of the important parts of Virtual Reality, it is used in many areas. The main ways to construct visual media are the methods based on geometry and based on images. Since the virtual reality based on images require inexpensive equipments and it can implement fast to obtain better effect.In this paper, the construction of visual media is introduced according to the current actuality of virtual reality technology. The construction process includes two parts: the first is the construction of surrounding environment; the second is the reconstruction of 3D models in the environment.In this paper, we introduced our method and compare it with other methods. Panoramic image is used to construct virtual environment in our experiment. For the panorama construction, the algorithm to stitch images based on SIFT features are applied. First, we take a sequence of images from a realistic environment and then stitch them into a panoramic image. Second the method of adding two adjacent images by weight function is used to eliminate the seam that is caused by stitching them together. The experiment result is not sensitive to illumination, orientation, rotation and so on. Besides, this method is easy to implement and can get good result, so the method is better than others.For the reconstruction of 3D models, in our experiment, the algorithm based on silhouette is used to reconstruct 3D objects. Texture is important in the display of the models. In this paper, OpenGL is used to do texture mapping according to estimating angle between image normal and triangle facet normal.The above study can provide theory foundation and technology support to construct visual media. At last, the platform of visual media construction is introduced, and the experiment results of its application are displayed.In all, the method based on images to construct visual media which requires simple equipment and low cost is a good way and can get better effect. |
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