The principles of image recording

Image by image recording used a door which is a mechanical or electronic shutter that opens and closes on the subject (figs A and B). The moving subject is therefore captured in a geometric space outside time. A rapid succession of such images is produced by cinema or television. Between the images, there is a temporal memory gap, in other words an absence of information. These gaps are filled by retinal persistence, helped by our memory or subjective imagination.
Continuous filming, on the other hand, leaves the door open all the time and eliminates the shutter. The speed of the film or the scanning speed is uniform and proportional to that of the moving subject (C)
Movements and subjects are recorded in time. The geometric scale of the classic image is thus replaced by a time scale, hence the name "time photography". There are no longer any temporal memory gaps and everything is recorded on a single document, making objective analysis possible.

<<