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by fishbeetle
Wed May 23, 2018 5:26 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 53
Views: 12049

Re: Hardware camera sync pulses

>If I use capture_continuous in PiCamera as described above, does than each pulse equal one image and can I solow down the capture frequency to corespond with my sd card speed? Yes and Yes. re time-stamping for the frame-sync pulses - I don't know of a way to do this but if it's possible I would be ...
by fishbeetle
Wed May 16, 2018 5:08 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 53
Views: 12049

Re: Hardware camera sync pulses

Indeed so, and to do the job properly I would have to generate a modified pulse stream with leading edges one exposure-time earlier than that of the frame sync pulses from the IO pin. This would be a straightforward matter with a simple PIC processor but, as it happens, it's not a problem in my appl...
by fishbeetle
Wed May 16, 2018 2:59 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 53
Views: 12049

Re: Hardware camera sync pulses

OK, couldn't get the flash driver to work in capture_continuous, but setting disable_camera_led=3 does generate the pulses I need. And driving the IR illuminator directly with these pulses works like a dream. I'm using exposure_mode=off and a fixed shutter speed of just 1-2ms and at 6 frames per sec...
by fishbeetle
Tue May 15, 2018 8:34 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 53
Views: 12049

Re: Hardware camera sync pulses

Thanks for responding, yes I should have said capture_continuous using PiCamera in Python. To be precise, I want to drive an IR illuminator with the pulse signal, if not directly then via some custom pulse shaping network. Any advise would be much appreciated. I'll be using the camera in fully manua...
by fishbeetle
Tue May 15, 2018 1:23 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 53
Views: 12049

Re: Hardware camera sync pulses

Hi There, I'm trying to use the LED flash sync feature in continuous grab mode on a Pi3B with a v2 camera. I followed the instructions from above and was able to get the flash pulse(s) for single grabs but in continuous grab mode (with exposure_mode off) I get no pulses. Should this possible? --- ED...
by fishbeetle
Tue Apr 03, 2018 4:46 pm
Forum: Camera board
Topic: Maximum capture speed
Replies: 4
Views: 1575

Re: Maximum capture speed

I've just hit this same speed-limit with v2 camera, RPi3B, Rasbian, fully up-to-date, PiCamera, Python3 maximum rate at which I can capture rgb stills in full 8Mpix resolution even with burst=True and using the video port is < 2 fps. Code snippet: camera = PiCamera(resolution=(3280,2464), framerate=...

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