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waveform80 / picamera

A pure Python interface to the Raspberry Pi camera module
https://picamera.readthedocs.io/
BSD 3-Clause "New" or "Revised" License
1.57k stars 357 forks source link

How to reduce capture time to 30ms? #688

Closed jsib0 closed 3 years ago

jsib0 commented 3 years ago

The capture() method currently take ~1-1.15 seconds to output an image. With an image resolution goal of 4064x3040, how can I achieve a capture time of < 30ms?

pwr33 commented 3 years ago

try using

use_video_port=True

in the capture statement,

camera port is slower than the framerate, video port is faster, but at full framesize not sure how fast.

read the manual, it is very good, with lots of good examples.

jsib0 commented 3 years ago

@pwr33

use_video_port=True is the obvious choice; it still does not achieve the desired time and quality we are looking for. Thank you for directing me to the manual. I should have been clear in my initial question. I was looking for something more of "out-of-the-box" that other may have tried. I will close as this there seems to be no work-around.

pwr33 commented 3 years ago

think you may be hitting the basic transfer speed limit of the gpu, don't think that has been massively upgraded even on the pi4

maybe try the raspistill C code as a start point