'Ramesh Raskar presents femto-photography, a new type of imaging so fast it visualizes the world one trillion frames per second, so detailed it shows light itself in motion. This technology may someday be used to build cameras that can look “around” corners or see inside the body without X-rays.
Photography is about creating images by recording light. Ramesh Raskar has invented a camera that can photograph light itself as it moves at, well, the speed of light.'
im still trying to grasp out how this works. how do you freeze the light burst unless your shutter is 1/1000000000000?
Didn't he say that was pretty much what was done?
The problem came with how much light was detected at that fast of speeds. So in order to get a usable amount of light, they did the same burst of light thousands (millions?) of times over, overlaying all of the photos until a visible image appeared.
I'll have to watch it again, i thought he said the problem with that was not enough light at those shutter speeds. i struggle with 1/50 indoors at f1.4...
Can you capture any event at this frame rate? What are the limitations?
We can NOT capture arbitrary events at picosecond time resolution. If the event is not repeatable, the required signal-to-noise ratio (SNR) will make it nearly impossible to capture the event. We exploit the simple fact that the photons statistically will trace the same path in repeated pulsed illuminations. By carefully synchronizing the pulsed illumination with the capture of reflected light, we record the same pixel at the same exact relative time slot millions of times to accumulate sufficient signal.
