Friday, October 19, 2012

mildly interesting: time as a spatial dimension (photographically)

these are spacetime photos, as found off an article @slate:

in the words of the author:
"The abstract-seeming images here are not the result of some wacky Photoshopping. Jay Mark Johnson’s photos are actually incredibly precise. The reason they look like this is because he uses a slit camera that emphasizes time over space.
This unique look is possible because the fixed-position slit camera registers only a vertical sliver of a scene. Whatever passes that slit by gets registered in a narrow line. Over a period of time, which Johnson can control, it registers line after line. The final result is a bunch of these lines all pushed together. (In this sense, you could say each photograph is actually a composite of hundreds of very skinny images.)
it therefore makes sense that a periodic motion, like that of ocean waves, would appear the same as a typical photograph:


1 comment:

Anonymous said...

This is exactly what is done for photo finishes in track races. They line up a sequence of rapidly taken thin photos of the finish line. That is why everyone in the photo, even the ones way behind, all appear to be diving forward at the same time. Finding the x-coordinate of the runner's chest in the photo is also how they determine precise finish times.