You always know what two fields go together. Odd with odd, even with even. Unfortunately matching each set only gives you half a frame. You need both sets of fields if you want to reconstruct a WHOLE frame, and there's three ways to do that:the Black Monarch wrote:Or you knew which 2 fields went togetherklinky wrote:yeah but if you muxed the fields of those 2 cycles together you'd get a ugly frame unless you de-interlaced or blended them together.
(1) Fake the missing fields by interpolation or duplication. This typically looks ugly, unless you reduce the number of horizontal scanlines by 2.
(2) Blend the fields together. This looks better, but leaves ghosting artifacts.
(3) Just stick the two fields together, which gives you those messy interlacing artifacts.