As a new rendering thcnique

image based rendering(IBR) receives more and more attention becarse of its high efficiency in virtual scenes modeling and rendering comparing with traditional geometry based rendering. The major challenge of IBR is to represent the continuous scene with images of discontinuous views

so that users can change their viewpoints arbitrarily in real time. In other words

we should find a way to stitch images of different views together. In this paper

we show the implementation of an image based spherical virtual in door environment. The scene is represented as a spherical panorama

which means user is fixed at the center of the sphere and can only look around. Compared with previous works

our system can stitch a continuous panorama from several photos with a semiautomatic method more easily. Meanwhile

a lookup table based algorithm is used to realize the real time walkthrough on a fixed point. At the end of this paper

some experimental results can demonstrate the efficiency and quality of our method.