High speed mode

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pierros
Posts: 1
Joined: Thu Jul 25, 2019 11:03 am

High speed mode

Post by pierros » Fri Aug 09, 2019 5:26 pm

Can someone please explain what does the high-speed mode actually do?
Why have it enabled or not?
Is there a degrade on image quality somehow?

easybob95
Posts: 147
Joined: Wed May 25, 2016 3:51 pm

Re: High speed mode

Post by easybob95 » Wed Aug 14, 2019 1:23 pm

Enable high speed mode does not affect image quality. With this mode, you are supposed to get highest frame rate during capture.

Alain

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Support2@ZWO
Posts: 668
Joined: Thu Feb 09, 2017 4:58 am

Re: High speed mode

Post by Support2@ZWO » Thu Aug 15, 2019 1:54 am

Thanks Alain。
High speed mode will be enabled when the image pattern is raw8. In this mode, we will use a lower bit of AD conversion than the normal mode, (most of the time, it is still bigger then 8 bit), And remove the extra bits and upload the data.
So this is the reason why there is no effect on the image.
For the speed, for most of the sensor, a lower bit of AD conversion will have a higher framerate, for some case, a higher framerate will be more useful.

Another information: In the past, the data rate of the USB bandwidth will be larger than the image sensor's data rate. In this situation, the framerate of the camera is limited by the sensor. And highspeed with Raw16 could not get a better performance, frame rate increases are limited, while image quality is greatly reduced. That's why we do not support the Highspeed with Raw16.
But now, things are different, image sensor has a larger data rate than USB. So in the future, we will support the Highspeed mode with Raw16.

Thanks
Chad
ZWO Driver Engineer
Location:lon=120.6 lat=31.3
SuZhou China

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