7 ms·

This is amazing. These framerates are 1/10th of what a cursory google search says I can get out of a top of the line high-speed camera, but for probably 1/100th

This is amazing. These framerates are 1/10th of what a cursory google search says I can get out of a top of the line high-speed camera, but for probably 1/100th the price. You could make so many awesome instructional videos with a tool like this.

ortusdux 7y ago
The chronos 1.4 I have will do 640x96 @ 21,649fps for $3k. So that's 20 times faster for 50 times the price; pretty close to your estimate. The chronos does have a few other amenities that make it worth the price.
- ekr 7y ago
  That's 500 times the price (unless you're taking into account the raspberry pi itself).
  - hoseja 7y ago
    ... which you should
- kragen 7y ago
  Is it made in the US? Is it export-controlled? Here in Argentina getting export-controlled gear is a pain.
  - ortusdux 7y ago
    They are made in and shipped from Canada. I doubt they are export-controlled, but I would email them. They were quite responsive to most of my inquires. Just don't ask when they might implement features. I'm still waiting on some stuff that are listed on the 2 year old spec sheet as "*features (that) are fully supported in the camera's hardware, but are not yet supported in software. They will be added in a free software update after the camera's initial release."
bufferoverflow 7y ago
You can shoot 960fps at 720p/1080p with some smartphones these days. If you decide to go that route, make sure to get one that doesn't interpolate the frames, but does true 960fps.
- CobrastanJorji 7y ago
  Could you suggest such a phone because that sounds wicked awesome to experiment with.
  - CarVac 7y ago
    The Galaxy S10 series (including the S10e).
  - deleted 7y ago
    [deleted]
ktpsns 7y ago
Which brings me to this Gedankenexperiment: If you buy/build 10 of the raspberry pi based high speed cameras and run them in parallel and could make sure each camera sees the same (we don't consider details here for the time being), is it possible to merge the videos in order to reach the frame rate of a "top of the line high-speed camera"? I could imagine two scenarios: 1. Start recording with time delay. Probably requires excellent clock synchronisation, a real time kernel, reliable/comparable hardware (gatter timings differ at small timescales). If this works, this would provide a high quality equidistand framerate. or 2. Start recording randomly, synchronize by time or with an video event, and merge the frames. This will result in a stochastic distribution of frame rates. The usefulness of such a movie depends on what it is supposed to be used for (thinking of scientific usage). Will probably not give nice slow-mo movies. But here comes the catch: With interpolation, the shortest reachable frame rate dictates the quality of this "superposition camera". How many cheap cameras do we need to archieve, on average, the top line high speed camera? I leave the questions open for friends of Gedankenexperiments ;-)
- rasz 7y ago
  pee cameras are clocked externally(EMI made them include 25MHz clock gen on camera module itself), so in theory you could connect them all to a single clock distribution source with appropriately shifted phases
  - sansnomme 7y ago
    How do you disable onboard clock or is it automatic?
    - rasz 7y ago
      its already external, on the back of each camera
      - sansnomme 7y ago
        But it's only selectively enabled no?
HermannSW 7y ago
You can get Raspberry v1 camera clone now for less than 4$(!) with free shipping on aliexpress: https://www.aliexpress.com/wholesale?SearchText=raspberry+5MP&SortType=price_asc&g=y&isFreeShip=y&switch_new_app=y https://www.aliexpress.com/wholesale?SearchText=raspberry+5M... And unlike v2 camera, the cheap v1 camera allows (besides high framerate capturing) for global external shutter capturing as well(!). I did capture an in flight 109m/s airgun pellet 10 times in a single multiple exposure frame! https://stamm-wilbrandt.de/en/Raspberry_camera.html#global_external_shutter https://stamm-wilbrandt.de/en/Raspberry_camera.html#global_e...

ortusdux 7y ago

The chronos 1.4 I have will do 640x96 @ 21,649fps for $3k. So that's 20 times faster for 50 times the price; pretty close to your estimate. The chronos does have a few other amenities that make it worth the price.

ekr 7y ago
That's 500 times the price (unless you're taking into account the raspberry pi itself).
- hoseja 7y ago
  ... which you should
kragen 7y ago
Is it made in the US? Is it export-controlled? Here in Argentina getting export-controlled gear is a pain.
- ortusdux 7y ago
  They are made in and shipped from Canada. I doubt they are export-controlled, but I would email them. They were quite responsive to most of my inquires. Just don't ask when they might implement features. I'm still waiting on some stuff that are listed on the 2 year old spec sheet as "*features (that) are fully supported in the camera's hardware, but are not yet supported in software. They will be added in a free software update after the camera's initial release."

bufferoverflow 7y ago

You can shoot 960fps at 720p/1080p with some smartphones these days. If you decide to go that route, make sure to get one that doesn't interpolate the frames, but does true 960fps.

CobrastanJorji 7y ago
Could you suggest such a phone because that sounds wicked awesome to experiment with.
- CarVac 7y ago
  The Galaxy S10 series (including the S10e).
- deleted 7y ago
  [deleted]

ktpsns 7y ago

Which brings me to this Gedankenexperiment: If you buy/build 10 of the raspberry pi based high speed cameras and run them in parallel and could make sure each camera sees the same (we don't consider details here for the time being), is it possible to merge the videos in order to reach the frame rate of a "top of the line high-speed camera"? I could imagine two scenarios: 1. Start recording with time delay. Probably requires excellent clock synchronisation, a real time kernel, reliable/comparable hardware (gatter timings differ at small timescales). If this works, this would provide a high quality equidistand framerate. or 2. Start recording randomly, synchronize by time or with an video event, and merge the frames. This will result in a stochastic distribution of frame rates. The usefulness of such a movie depends on what it is supposed to be used for (thinking of scientific usage). Will probably not give nice slow-mo movies. But here comes the catch: With interpolation, the shortest reachable frame rate dictates the quality of this "superposition camera". How many cheap cameras do we need to archieve, on average, the top line high speed camera? I leave the questions open for friends of Gedankenexperiments ;-)

rasz 7y ago
pee cameras are clocked externally(EMI made them include 25MHz clock gen on camera module itself), so in theory you could connect them all to a single clock distribution source with appropriately shifted phases
- sansnomme 7y ago
  How do you disable onboard clock or is it automatic?
  - rasz 7y ago
    its already external, on the back of each camera
    - sansnomme 7y ago
      But it's only selectively enabled no?

HermannSW 7y ago

You can get Raspberry v1 camera clone now for less than 4$(!) with free shipping on aliexpress: https://www.aliexpress.com/wholesale?SearchText=raspberry+5MP&SortType=price_asc&g=y&isFreeShip=y&switch_new_app=y https://www.aliexpress.com/wholesale?SearchText=raspberry+5M... And unlike v2 camera, the cheap v1 camera allows (besides high framerate capturing) for global external shutter capturing as well(!). I did capture an in flight 109m/s airgun pellet 10 times in a single multiple exposure frame! https://stamm-wilbrandt.de/en/Raspberry_camera.html#global_external_shutter https://stamm-wilbrandt.de/en/Raspberry_camera.html#global_e...