3 ms·
Ok, what's the underlying storage?
by voytec 2y ago
Ok, what's the underlying storage?
- jsheard 2y agoHigh speed cameras usually record into RAM and then dump the recording out to an SSD in slower-than-realtime when it ends. Since the recording duration is limited by RAM capacity they have rolling modes which record continuously into a ring buffer and then store the current contents when the shutter is pressed, so that unpredictable events can be captured after they happen.
- freedomben 2y agoIs RAM even fast enough? I remember reading somewhere that the high speed cameras have special cache-like memory on or near the processor that is faster write than RAM. I can't find it now though so I'm taking it with a grain of salt.
- jsheard 2y agoMaybe in specialty cameras with ultra low maximum recording durations but it's usually just a bunch of DRAM, take this Phantom camera as an example. https://www.phantomhighspeed.com/products/cameras/tmx/7510 https://www.phantomhighspeed.com/products/cameras/tmx/7510 The spec sheet lists up to 512GB of RAM depending on configuration. There's no way you're scaling cache-like SRAM up to those numbers.
- Denvercoder9 2y agoThe necessary data rate for these photo finish cameras isn't actually that high, because every "frame" is only 1 pixel wide. If the photo is 10000 pixels high, you need a datarate of about 10 Gbit/s at 40000 fps and 24 bits/pixel. RAM is plenty fast enough for that. Regular high-speed cameras that shoot a video are a whole other story, though.