TDeint and TIVTC

[Frank62]

Originally Posted by Katie Boundary

...the two fields be from slightly different images.

That exactly is how "motion" in connection with video is "defined", at least used: The two fields contain different images. Shot at a slightly different time. So what happened from the first to the second point in time is "motion" of some or all objects in the pictures.
If you can't accept this, w_m seems to be right with his last sentence. A question of terminology.