  In spite of the fact that efficient compression methods for dense
two-dimensional flow fields would be very useful for modern video codecs,
hardly any research has been performed in this area so far. Our paper addresses
this problem by proposing the first lossy diffusion-based codec for this
purpose. It keeps only a few flow vectors on a coarse grid. Additionally stored
edge locations ensure the accurate representation of discontinuities. In the
decoding step, the missing information is recovered by homogeneous diffusion
inpainting that incorporates the stored edges as reflecting boundary
conditions. In spite of the simple nature of this codec, our experiments show
that it achieves remarkable quality for compression ratios up to 800 : 1.
