Quote:
Originally Posted by Manao
I think we can agree that on this forum, when somebody says he "deinterlaced a video", nobody will assume he bob-deinterlaced it, just that he took a 50i/60i video and made it 25p/30p. Bobbing has become more than a deinterlacing method, it has become the process of taking a 50i/60i video and making it 50p/60p (see the number of avisynth filters with 'bob' in their name, and look at what they do).
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It's true that most people use the term "deinterlacing" in the simple way, meaning 25/30i -> 25/30p. But in fact, that is not a good nomenclature.
I don't need to explain anything to *you*, Manao.
- But you made the whacky assertion of
"deinterlacing != bobbing", and that is just not true. Bobbing
IS deinterlacing, and evenmore it is the "true" way of deinterlacing. Opposed to the "usual" meaning of deinterlacing, which is only a crippled subset.
(The process of) "Deinterlacing" is exactly the opposite of (the process of) "Interlacing".
During interlacing, every two raw source frames are combined into one frame. From my understanding, the reverse operation of that is to undo that combination again.
Now, when the majority of people thinks the reverse operation is to undo that combination
and to throw away half of the result, then it's a sign that too little education or clarification has been done in all those years.
Having stumbled of this bobbing/deinterlacing confusion more often than enough, I pretty much prefer the terms "same-rate deinterlacing" and "double-rate deinterlacing". Though not quite perfect (it should rather be "half-rate" and "full-rate"), at least it makes clear what is really going on, and should avoid lots of unnecessary confusion.