Actually, I used that shot because it was static enough, easier to find the right settings for HDTV rescale and space alignment; but, as it's static, it obviously looks good in motion...

I'm still testing, though; for example, I discovered that some scenes are almost perfectly open matte in comparison to DVD - loosing only few pixels at one or both sides; they just need to be cropped, without resizing:

(link to larger image: http://s16.postimg.org/niaji8t8z/matrix_040947.jpg)

(link to larger image: http://s16.postimg.org/6j1l2zi1f/matrix_044978.jpg)

(link to larger image: http://s16.postimg.org/fo9xwulg3/matrix_048055.jpg)

while for the other scenes, the HDTV need to be downscaled, and placed exactly over the upscaled DVD - I just have to test them over the ColourMatch'ed BD yet, probably it will work well too...

If only I could find an avisynth script that could find out automatically the overlay alignment between two clips...

***

another idea: does exist an avisynth (or virtualdub) plugin that could try to recreate the "missing corners" of the following image

(link to larger image: http://s22.postimg.org/6bo6toefj/matrix_PLUS.jpg)

using some kind of space and time interpolator? I found this thread about using SVP for "ambilight-like" effect; the script could be modified, but of course it will not fill the corners with high resolution images, but only with "lights"... any other solution? I'm pretty sure that does not exist, it will be too easy! (^^,)