A technique for matching projective views with application to color image mosaicing

This paper presents an original coarse-to-fine technique for creating mosaics of color images related by projective transformations. The actual projective transformation is first approximated with an affine transformation whose parameters are estimated by means of an algorithm operating in the frequency domain. The projective transformation is then computed with an algorithm based on feature matching; the computational complexity of this operation is substantially reduced by the preliminary affine approximation which reduces the search area for corresponding points. A practical example of mosaicing of two color images of a planar fresco is reported and discussed. Some experimental results are also reported in order to assess the practical performance of our technique