  The optical flow estimation has been assessed in various applications. In
this paper, we propose a novel method named motion edge structure
difference(MESD) to assess estimation errors of optical flow fields on edge of
motion objects. We implement comparison experiments for MESD by evaluating five
representative optical flow algorithms on four popular benchmarks: MPI Sintel,
Middlebury, KITTI 2012 and KITTI 2015. Our experimental results demonstrate
that MESD can reasonably and discriminatively assess estimation errors of
optical flow fields on motion edge. The results indicate that MESD could be a
supplementary metric to existing general assessment metrics for evaluating
optical flow algorithms in related computer vision applications.
