Clarification of setAwbMode function when not using AUTO mode

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

I am looking to lock the white balance of a camera to static white balance gains.
In looking through the multimedia API, it seems at first glance that I can use setAwbMode to change the mode to ARGUS::AWB_MODE_DAYLIGHT, but the documentation is not detailed and is ambiguous.
The name of the function is “set auto white balance mode,” so does that mean that ARGUS::AWB_MODE_DAYLIGHT is still an “auto” mode and will adjust gains behind the scenes still, just as AWB_MODE_AUTO does? Or will it lock the white balance to static gains?

3

Be aware that some parameters may get auto-tune, including gain-range, digital-gain range, exposure and wb.
Searching this forum you may find some examples for older L4T releases, you would adjust and share for more recent use cases.

4

I am aware that there are other settings to control auto exposure and analog/digital gain. I am asking specifically about white balance if put in a mode such as ARGUS::AWB_MODE_DAYLIGHT.

Searching this forum you may find some examples for older L4T releases, you would adjust and share for more recent use cases.

I’m not sure I follow. Are there examples of how NVIDIA’s auto white balance code handles specific presets in older L4T releases?

5

hello bhagen55,

after you configure AWB modes, for example, AWB_MODE_DAYLIGHT, it configure the preferred color temperature, auto white balance still running at back-end.

may I know what’s the actual use-case,
you may enable awblock if you would like to have fixed white balance gains.
thanks

6

Yes we would like fixed daylight white balance gains.
If I set AwbLock, then setAwbMode(Argus::AWB_MODE_DAYLIGHT), will I have static and repeatable white balance levels?
IE if I use those settings, and I run two recordings, will they both be guaranteed to have the same white balance gains?

7

hello bhagen55,

why don’t you check Argus samples, /usr/src/jetson_multimedia_api/argus/samples/userAutoWhiteBalance/
you may call Argus::IAutoControlSettings::setWbGains for setting wbGains manually.

8

We can explore that. We were hoping that the existing presets would make applying a sane static white balance profile easy.

9

hello bhagen55,

there’s API for setting wbGains, currently, we don’t support command option to change wbGains.

11

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