Miscellaneous Projects and Experiments
Imagine, a drop falls down onto some hard surface and
-platsch- crashes there.
If one does it right, a nice crown-like structure can be observed
for a couple of milliseconds. I once tried to protograph this process
at well-defined times using only a normal camera, a normal photo flash
and stuff which I had available at home. Nevertheless, some
nice images came out.
When a steel ball drops down from less than a meter into sand,
it creates a crater within a time of about 100ms (0.1 seconds).
Unfortunately, the human eye is too slow to watch the formation of this
low-speed impact crater but exactly-triggered photos with an exposure of
shorter than 1/10000s (100us) can freeze the moment of impact.
The dynamics of slow processes like the formation of clouds can hardly be conceived merely by looking at them because changes happen on time scales which are too large for the human eye. So what? Let's speed up time!
Probably anyone has seen a time-lapse movie on TV but you can also
produce one yourself using a consumer-grade digital camera and
some additional logic.
Certain captchas can be automatically regognized by a computer when a design error is present which allows an attacker to obtain multiple captchas containing the same information. Read more...