You’re only looking at 1/2


You’re only looking at 1/2 a frame on the 1080 side. Wouldn’t a 1080 interlaced frame be your “…1080 X 540 = only 583,200 pixels” X 2 (2 fields per frame) or 1166440 pixels/frame? For an instantaneous field of view your math works but frame for frame the 1080i will give better resolution.

I deal with cameras, the company I work for make, that use 640X480 detectors (CCDs) and are able to use a technique that quadruples that count greatly increasing the resolution. Bringing it to a comparable 1280 X 720 frame size(more closer to 1280 X 960 but top and bottom are trimmed to display system status bars). It’s an old school technique that was the forerunner to some of the now popular optical stabilization processes being used in video cameras today.

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