Setting auto white balance regions in the ISP: Clarification about behaviour

[david.lind]

Hi,

I recently asked a question regarding auto-exposure regions, see:

Auto-exposure regions of interest: Clarification about region weights

Hello, I’m looking at the setAeRegions Argus::IAutoControlSettings::setAeRegions( const std::vector< AcRegion > & regions ) API method. For each AcRegion we can specify a certain weight. I would like some help understanding the function of these weights. Specifically: What’s the numerical range of the the weights? In case of multiple regions, should the weights be normalized to sum to 1? For example if I want two regions with equally high priority, should I set to the weights to (0.5, 0.5) …

I’m wondering if the same logic applies to auto white balance:

1. Are the weights for each region supposed to be in the range 0-1

2. Is the whole frame still considered when setting weights, and if so what would the assumed weight value for the unspecified region be?

3. Would setting a low value for a region, say 0.1 effectively deprioritize it relative the rest of the frame?

Any additional tips/guidelines in setting the region parameters in a sensible way are also welcome.

Thanks,
David

[kayccc]

Sorry for the late response.
Is this still an issue to support? Any result can be shared?

[david.lind]

Hi,

No worries!

Yes it would still be very helpful to get some more insight into setting these parameters. We’d like to avoid testing the settings empirically, so some more information regarding the logic and how it’s supposed to be used would be greatly appreciatedand give us a good starting point.