  The image retargeting problem is to find a proper mapping to resize an image
to one with a prescribed aspect ratio, which is quite popular these days. In
this paper, we propose an efficient and orientation-preserving one-step image
retargeting algorithm based on minimizing the harmonic energy, which can well
preserve the regions of interest (ROIs) and line structures in the image. We
also give some mathematical proofs in the paper to ensure the well-posedness
and accuracy of our algorithm.
