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High speed detection - exposure time

Pixy Software
#1

Hi,

I’m looking to track an object that appears in front the the pixy only for 14ms. As the framerate of the pixy is 50fps max, the pixy scan the surface each 20ms. So far it happens sometimes the pixy misses the detection because the object may appear after the pixy “see” and diseapear before the pixy “see” again.

I’m not expert in photo but I think exposure or shutter time time could perhaps help. The key point here is that the appearance of the object come with an modulated signal that I’m able to detect with an arduino using a photodiode ( that I could also perhaps connect directly to the pixy).
I can detect this signal in less that 3ms. if it is detected it means that the object is present.

Would there is any possibility to trigger the pixy camera so it can track immediately when the signal is detected. And then perhaps have possibility to detect position of the object EACH time it appears in front of the pixy

Thanks for your help
Chris

#2

Hello Chris,
What are you trying to detect?

#3

A laser dot that appears only 15ms

With 50 fps i detect but I miss some (a 15ms dot can come between the 20ms between each “scan”)

However there is a modulation inside the laser signal that i can detect in the first 5ms. if the modulation is present then i would like to “open” the cam of the pixy to detect the dot position. I think the exposure time is doing something similar in camera so i try to find a way to avoid needed a 100fps platform $$$$

Thanks

#4

Hello Chris,
If you can increase Pixy’s exposure time, you’ll increase the chances of detecting the modulated laser. One crazy idea is to put sunglasses on Pixy, so that Pixy will increase its exposure time without overexposing the laser dot (if that makes sense).

Edward