The technique of making "ultrafast" movies of repeating phenomena by imaging "one pixel" at a time and then assembling the raster-scan of all the pixels has been used for a long time.

The technique described in the paper is different from that....

    > Thus far, established ultrafast imaging
    > techniques either struggle to reach the
    > desired exposure time or require repeatable
    > measurements. We have developed 
    > single-shot 10-trillion-frame-per-second 
    > compressed ultrafast photography (T-CUP),
    > which passively captures dynamic events with
    > 100-fs frame intervals in a single camera exposure.