Insurmountable
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Re: Syncing a high power LED array to camera start frame.

Wed Apr 18, 2018 9:00 pm

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Insurmountable
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Re: Syncing a high power LED array to camera start frame.

Wed Apr 18, 2018 9:22 pm

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PiGraham
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Re: Syncing a high power LED array to camera start frame.

Thu Apr 19, 2018 7:34 am

You have a strange attitude.
If you did want to use a DSLR take a look at gphoto2 which should allow you to download images as they are taken using USB.
Since the issues discussed relate to the sensor changing to another SBC will make no difference.

And to reiterate, you can use rolling shutter sensors with moving scenes if you can deal with the inherent distortion and exposure artifacts. They aren't necessarily noticeable, depending on speeds, field of view, distance to object etc and some compensation may be possible.

6by9
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Re: Syncing a high power LED array to camera start frame.

Thu Apr 19, 2018 11:59 am

Insurmountable wrote:
Wed Apr 18, 2018 9:00 pm
Frame rate is more significant than exposure time. The fastest I've seen the current Pi camera run in 665fps which is 5.5ms but unless you are setting the frame rate you will have the standard 60fps 16.7ms or 30fps 33.4ms. Of course frame rate and exposure time are related
There you go, frame rate is not actually frame rate but effective frame rate.
Huh? What's your definition of frame rate vs effective frame rate then?
To me frame rate is the rate at which frames are delivered from the sensor, be that measured at frame start, frame end, or any other common point of two frames.
The relationship between frame rate and exposure time is that the frame period (1/frame rate) has to be greater than the exposure time, as you can't be exposing the same line of pixels for two different frames at the same time.
Insurmountable wrote:
Wed Apr 18, 2018 9:22 pm
Another option would be to use the Asus Tinker SBC instead of a Pi, I see they work with the Pi Camera. Anyone any idea on what the actual frame rate they can read from the camera is? The new updated version is meant to be stupid fast at processing video. Can you overclock the Pi camera? does the camera set the data transfer rate or the Pi ?
The camera board has a 25MHz oscillator on it. The sensor then has PLLs and divsors to increase that to a requested pixel clock rate, as programmed via a large number of I2C writes when you start using it. The sensor manufacturers will specify various maximum values for PLL settings and pixel rates. Feel free to delve into those register sets, but be aware that they frequently defy logic.
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Insurmountable
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Re: Syncing a high power LED array to camera start frame.

Thu Apr 19, 2018 1:14 pm

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Insurmountable
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Re: Syncing a high power LED array to camera start frame.

Thu Apr 19, 2018 1:35 pm

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Insurmountable
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Re: Syncing a high power LED array to camera start frame.

Thu Apr 19, 2018 1:53 pm

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Insurmountable
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Re: Syncing a high power LED array to camera start frame.

Fri Apr 20, 2018 8:17 pm

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