I also dislike unreliable image processing algorithms. Consistent minor artifacts are less distracting than occasional major artifacts. It's not only interpolat

I also dislike unreliable image processing algorithms. Consistent minor artifacts are less distracting than occasional major artifacts. It's not only interpolation which has this problem, but also deinterlacing. Fancy motion-aware deinterlacers fail in the same situations interpolators fail. For this reason my favorite deinterlacing filter is the Weston 3 Field Deinterlacing Filter (w3fdif in ffmpeg). It doesn't try anything too clever so it never seriously fails.