Julio Zaragoza , The University of Adelaide, Adelaide
Tat-Jun Chin , The University of Adelaide, Adelaide
Quoc-Huy Tran , The University of Adelaide, Adelaide
Michael S. Brown , National University of Singapore, Singapore
David Suter , The University of Adelaide, Adelaide
The success of commercial image stitching tools often leads to the impression that image stitching is a "solved problem". The reality, however, is that many tools give unconvincing results when the input photos violate fairly restrictive imaging assumptions; the main two being that the photos correspond to views that differ purely by rotation, or that the imaged scene is effectively planar. Such assumptions underpin the usage of 2D projective transforms or homographies to align photos. In the hands of the casual user, such conditions are often violated, yielding misalignment artifacts or "ghosting" in the results. Accordingly, many existing image stitching tools depend critically on post-processing routines to conceal ghosting. In this paper, we propose a novel estimation technique called Moving Direct Linear Transformation (Moving DLT) that is able to tweak or fine-tune the projective warp to accommodate the deviations of the input data from the idealised conditions. This produces as-projective-as-possible image alignment that significantly reduces ghosting without compromising the geometric realism of perspective image stitching. Our technique thus lessens the dependency on potentially expensive postprocessing algorithms. In addition, we describe how multiple as-projective-as-possible warps can be simultaneously refined via bundle adjustment to accurately align multiple images for large panorama creation.
Moving Least Squares, Image Stitching, Image Alignment, Projective Warps, Direct Linear Transformation
J. Zaragoza, T. Chin, Q. Tran, M. S. Brown and D. Suter, "As-Projective-As-Possible Image Stitching with Moving DLT," in IEEE Transactions on Pattern Analysis & Machine Intelligence.