GPU-aided Directional Image/Video Interpolation for Real Time Resolution Upconversion

can any explain the help me with the matlab code for the algorithm in this paper

a highly parallelized two-pass directional image/video interpolation
algorithm for real time resolution upconversion.
The image interpolation is carried out in two passes
The first pass generates a quincunx image by interpolating the missing pixels with four available diagonal neighbors, as marked by gray circles in .
The missing pixels in the quincunx image are then interpolated in the second pass