Poor brightness estimation #46
Description
The brightness estimation example is good at showing how to access the camera data on the CPU, but it does not help with trying to calculate a light level.
For example, if I face a white wall, I get a higher brightness score than if I look towards a sunny window or a lamp.
This is a request for the Passthrough Camera API to expose some information that would help with detecting some sort of brightness or exposure level. I imagine this would be in the form of getting an exposure time and/or ISO level. (Let me know if there's a better place to post this...)
My use case is for having stitching multiple camera images together into 1 roughly coherent panorama to use for a reflection probe. Here's a bunch of individual flat photos sitting around my view, and you can see the most obvious artifact is the border between an image with high exposure and one with low exposure.
Understandably we can't lock the exposure of the passthrough cams. However I think that if I had access to the exposure/ISO for each image, I could post-process them to compensate for the auto-exposure.