Non-rigid registration between color channels based on joint-histogram entropy in subspace

Our study proposes a non-rigid image registration method between color channels in a color image. It minimizes the entropy in a dominant subspace of the joint-distribution of two or more images. The proposed algorithm is based on the observation that the displacement between color channels affects only the dominant subspace in the joint-distribution of pixel values. Experiments estimating motion parameters for B-spline non-rigid deformation model demonstrate the effectiveness of the proposed registration technique.