Mohamed,
If you want to stitch images, you definitely want them synchronized (as we do
with panoramic cameras). Without the synchronization you may consider them to
have random times.
And in any case Exif file header contains the precise timestamps, so you may
compare/use them.
Andrey
---- On Wed, 08 May 2019 14:14:20 -0700 Mohamed Morsy <mmo...@redzone.com>
wrote ----
If the camera is in motion and we wanted to stitch together the frames from all
4 imagers, would it be better to have them synchronized? If they weren't
synchronized would the frames still match perfectly or would the offsets be
noticeable?
Mohamed
From: Elphel Support <mailto:support-list@support.elphel.com>
Sent: Wednesday, May 8, 2019 3:48:29 PM
To: Mohamed Morsy; Elphel List
Subject: Re: [Elphel-support] 10393 Imagers Synchronization
Hello Mohammed,
You can save camera settings so they will be precisely synchronized. In "free
running" mode each sensor can have different WOI and so different FPS. You may
find info on synchronization here: https://wiki.elphel.com/wiki/Trigger_393
The disadvantage of synchronized mode is in low-light conditions, because when
operated in free running mode rolling-shutter sensors can have exposure up to
frame readout period (14.5 fps full resolution), exposure and readout overlap.
In triggered mode exposure and readout are not overlapped, so frame period can
not be below exposure time plus readout time. Other than that in triggered mode
all sensors have beginning of exposure at exactly the same moment (to
microsecond precision), same
applies to multiple 393 camera if they are connected with sync cables
Andrey
---- On Wed, 08 May 2019 12:32:00 -0700 Mohamed Morsy
<mailto:mmo...@redzone.com> wrote ----
Hello Oleg,
I understand that when 4 imagers are connected to the 10393, they are not in
sync by default. Do you know how out of sync they are? Also, is the lack of
synchronization noticeable? If the cameras are in motion, will there be
significant gaps between the
different imagers' frames? If this is something you've tested please let me
know.
Thank you,
Mohamed Morsy
RedZone Robotics
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