Re: 1960s/70s Philips video camera
A bit more about "Lines" to clear any confusion. Simplistically:-
The picture is made up of 625 horizontal scanning lines (or 405, 525 according to standard in use). Of these 625 lines 575 are visible ones with picture information in them, the other 50 are lost in the flyback period.
TV engineers refer to 400, 500 or whatever vertical lines of resolution. These are not "scan" lines as per the previous paragraph but the number of lines that can be seen (resolved) from a test card (test pattern) under ideal conditions.
This is a measure of the nebulous concept of how sharp the picture looks. There are electronic circuits that can visually improve the appearance of the picture called aperture correctors, but that is a story for another day.
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