Research And Implementation Of Spherical Scene Based On Image

Recently the problem of structuring virtual scene based on the image-based is focused in the virtual reality research. Based on the theory and method of computer vision and image processing, it uses the simple image combination instead of modeling and exaggerating based on the three dimensional geometry. Therefore, in structuring true feeling scene and the rendering speed, comparing with the tradition technology based on the geometry, the technology based on images-based rendering has the superiority. Panorama stitching technology is the key of scene immersing feeling, and becomes an important expression method in the virtual reality and the computer vision.Because of the existing main virtual scene which is image-based rendering and limits the direction angle of view, this thesis constructs the virtual scene based on the spherical panorama. The main goal of the research is implementing of observation the virtual scene at all directions, the thesis focus on this problem, the major contribution includes:Firstly, the thesis constructs a net virtual scene model based on the spherical panorama. This model takes the spherical panorama as the point, and makes each point link others points together through the spatial chain in the scene, according to the corresponding related position in the space, and every point has paths from 16 directions, comparing to the general grid virtual scene which has paths from just 8 directions.Secondly, the bilinear interpolation algorithm is used to solve the distortion problem in projection process. The bilinear interpolation algorithm solves the distortion problem by reverse computing, that is to say, computing all of pixels value in the image after projection using reverse projection formula, and then computing the corresponding location of every pixel in the source image according to its location in the projection image, and gaining the actual pixels value using bilinear interpolation. The experiment indicates that the method can solve the distortion problem in projection process efficiently.Thirdly, the spherical panorama stitching is implemented. The thesis proposes a method to structure the spherical panorama by integrating of three images, and in the matching process, a spherical panorama matching method using the image matching method which is from coarse to refined, based on gray relation of characteristic point, is proposed, according to the shape of plane image in spherical projection images, which automatically distills characteristic points to splice spherical projection images in plane lays, and manually distills characteristic points to stitch spherical projection images in looking down and looking upon lays, and the spherical panorama implemented finally has good visual effect.