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Didée
Thanks for pointing this out, however with my technique the frame c can still be recovered, just use different coeficients.
You say it's not blended, but I'm not using the term properly. I don't believe that a current and previous frame is blended, but two fields in one frame are spatially blended. You can also consider this as blended of two adjacent fields temporally.
Also, if my model is correct, the blends are easy to find; it's any frame where the top and bottom fields equal each other.
You can quickly see that my model is pretty close by subtracting adjacent fields; if there's results that are nearly neutral grey, then the two fields were almost equal.
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