A new method for affine invariants extraction based on affine geometry
Atr Key · 2011
A new affine invariants based on affine geometry for object recognition and matching is proposed in the paper.The algorithm can be divided into three following steps.Firstly,extract the centroid and extend centroid of the object region.The connecting line between them thus devides the region into two parts,and the centroids of the two parts will be recalculated.Iteratively,we can obtain the demand centroids that satisfy the requirement.Secondly,calculate the areas of the quadrangles,whose vertexes are the centroids of the regions cut by the connecting line and the centroids of the two parts.Thirdly,calculated the ratios of the areas and the affine invariant vector is acquired Besides,the parameters of the affine transform can also be computed by the coordinates of the centroids.It is proved by the experiment that the extracted affine invariants are of robustness,efficiency and high classification accuracy.