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More detailed Explanation's for anyone interested in the general design of, outwardly pointing, CHDK or SDM Camera Array's.
This type of, outwardly pointing, multi-camera rig is used for capturing panoramas, the main design goal is to "MINIMIZE" Parallax stitching errors, So a design requirement is locate the cameras close together as possible.
The FourSee isn't "outwardly pointing" -- the four cameras point at a screen upon which a large-format lens projects an image. Thus, all four cameras sample the same view. The control makes two of them capture at 240FPS a half frame out of sync to provide a 480FPS base, and the other two sample 24FPS and stills with longer exposures to enhance the dynamic range up to 16-20EV. From the resulting Time Domain Continuous Imaging (TDCI) data, one can computationally render stills or video frame representing any time intervals.
We have even implemented TDCI capture inside a single PowerShot using CHDK to grab and encode the live view feed: http://aggregate.org/DIT/ei2017CHDK.pdf