You can't ask a book a question, but you can read the words!
I think that if you don't know that in an interlaced scan records a field 1, with it's lines numbered 1, 2, 3, 4, 5, etc, AND THEN records a field 2, with that's lines numbered 563, 564, 565, 566, etc, (that's for HD, the field 2 line numbers for PAL and NTSC are different ones), you really ought to learn some technical information ASAP.
[TBH, I've always thought that describing what everyone knew as field 1 and field 2 as "odd & even", "top & bottom" or anything else were simply examples of deliberate obfuscation designed to add a layer of unnecessary jargon that only confuses people.]
Start with this
http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.709-5-200204-I!!PDF-E.p...
and every time you see something that you don't understand, ask someone or get on the internet and find out.
[BTW you can have a picture that's taken all at the same time in an interlaced signal, i.e., both fields actually recorded by the camera at the same moment rather than a 50th of a second apart, but that's called Segmented rather than Interlaced to avoid confusion.]
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