Image-based rendering has been a popular technique to simulate a visually rich telepresence and virtual reality
experience. The construction of panoramic image mosaics is an indispensable step in image-based rendering systems like
QuickTime VR and Surround Video. The conventional methods for creating panoramic image mosaics with regular
photographic or video images use geometrical feature points and optimization to the overlapped areas of the two
consecutive images, and then align and mosaic the corresponding areas using the blending or stitching algorithm. This
paper introduces a novel and efficient method to build panoramic image mosaics. The proposed method divides the
overlapped areas of the consecutive images into several sub-areas. The feature point, whose gradient value of intensity is
the maximum in the sub-area can be found easily. After selecting these feature points, we warp the images using an
affine transformation based on point set matching. Then the graph cut algorithm is used to build the seamless image
mosaic which makes the overlapped areas containing no visible ghosting or blurred details. It is shown by the
experiments that the new method can obtain mosaics of high quality and reduce the computing time.
A global optimization approach for construction of a 360° full-view panoramic mosaic is presented with global
consistency in this paper. There are three primary steps in this approach. The first is a local registration using SIFT. In
the second step, an efficient algorithm for finding a global consistent registration of all images is developed. The local
registration matrices with the boundary condition are used for computing the initial parameters of the iterative
optimization for the global consistent registration, to adjust/reduce the alignment error accumulated by the local
registering and stitching of adjacent two images. Lastly, the overlapping areas of the images are stitched by the graph cut
algorithm and blended with a multi-resolution method. It is proven by the experiment results in this paper that the
presented approach can effectively construct panoramic mosaics with global end-to-end consistency.
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